46906Federal Register /Vol. 61, No. 173/Thursday ...deq.ne.gov/NDEQProg.nsf/xsp/.ibmmodres/domino/OpenAttachment/CN... · 75202–2733, (214) 665–7220. Donald Toensing, Chief,

46906 Federal Register / Vol. 61, No. 173 / Thursday, September 5, 1996 / Rules and Regulations

ENVIRONMENTAL PROTECTIONAGENCY

40 CFR Part 63

[AD–FRL–5543–1]

RIN 2060–AE37

National Emission Standards forHazardous Air Pollutant Emissions:Group I Polymers and Resins

AGENCY: Environmental ProtectionAgency (EPA).ACTION: Final rule.

SUMMARY: This action promulgatesnational emission standards forhazardous air pollutants (NESHAP)from existing and new plant sites thatemit organic hazardous air pollutants(HAP) identified on the EPA’s list of 189HAP. The organic HAP are emittedduring the manufacture of one or moreelastomers.

In the production of elastomers, avariety of organic HAP are used asmonomers or process solvents.Available emissions data gathered inconjunction with the development ofthe elastomer standards show that thefollowing organic HAP are those whichhave the potential for reduction byimplementation of the standard:Styrene, n-hexane, 1,3-butadiene,acrylonitrile, methyl chloride, hydrogenchloride, carbon tetrachloride,chloroprene, and toluene. Some of thesepollutants are considered to bemutagens and carcinogens, and all cancause reversible or irreversible toxiceffects following exposure. Thepotential toxic effects include eye, nose,throat, and skin irritation; liver andkidney toxicity, and neurotoxicity.These effects can range from mild tosevere. The rule is estimated to reduceorganic HAP emissions from existingaffected sources by over 6,300megagrams per year (Mg/yr). Themajority of the organic HAP regulatedby these standards are also volatileorganic compounds (VOC). In reducingemissions of organic HAP, VOC are alsoreduced.

The rule implements section 112(d) ofthe Act, which requires theAdministrator to regulate emissions ofHAP listed in section 112(b) of the Act.The intended effect of this rule is toprotect the public by requiring themaximum degree of reduction inemissions of organic HAP from new andexisting major sources that theAdministrator determines is achievable,taking into consideration the cost ofachieving such emission reduction, andany nonair quality, health and

environmental impacts, and energyrequirements.EFFECTIVE DATE: September 5, 1996. Seethe Supplementary Information sectionconcerning judicial review.ADDRESSES: Docket. Docket No. A–92–44, containing information consideredby the EPA in development of thepromulgated standards, is available forpublic inspection and copying between8 a.m. and 4 p.m., Monday throughFriday, at the following address in roomM–1500, Waterside Mall (ground floor):U. S. Environmental Protection Agency,Air and Radiation Docket andInformation Center (MC–6102), 401 MStreet SW., Washington, DC 20460;telephone: (202) 260–7548. A reasonablefee may be charged for copying docketmaterials.FOR FURTHER INFORMATION CONTACT: Forquestions concerning applicability andother rule determinations, inquiriesshould be directed to the appropriateregional office contact listed below:Greg Roscoe, Air Programs Compliance,

Branch Chief, U.S. EPA Region I, 5EA,JFK Federal Building, Boston, MA02203, (617) 565–3221.

Kenneth Eng, Air Compliance BranchChief, U.S. EPA Region II, 290Broadway, New York, NY 10007–1866, (212) 637–4000.

Bernard Turlinski, Air EnforcementBranch Chief, U.S. EPA Region III(3AT10), 841 Chestnut Building,Philadelphia, PA 19107, (215) 597–3989.

Jewell A. Harper, Air EnforcementBranch, U.S. EPA Region IV, 3345Courtland Street, NE., Atlanta, GA30365, (404) 347–2904.

George T. Czerniak, Jr., Air EnforcementBranch Chief, U.S. EPA Region V(5AE–26), 77 West Jackson Street,Chicago, IL 60604, (312) 353–2088.

John R. Hepola, Air Enforcement BranchChief, U.S. EPA Region VI, 1445 RossAvenue, Suite 1200, Dallas, TX75202–2733, (214) 665–7220.

Donald Toensing, Chief, Air Permittingand Compliance Branch, U.S. EPARegion VII, 726 Minnesota Avenue,Kansas City, KS 66101, (913) 551–7446.

Douglas M. Skie, Air and TechnicalOperations, Branch Chief, U.S. EPARegion VIII, 999 18th Street, Suite500, Denver, CO 80202–2466, (303)312–6432.

Colleen W. McKaughan, Air ComplianceBranch Chief, U.S. EPA Region IX, 75Hawthorne Street, San Francisco, CA94105, (415) 744–1198.

Christopher Hall, Air Toxics ProgramManager, U.S. EPA Region X, 1200Sixth Avenue, OAQ–107, Seattle, WA98101–9797, (206) 553–1949.

For information concerning thetechnical analysis for this rule, contactMr. Robert Rosensteel at (919) 541–5608, Organic Chemicals Group,Emission Standards Division (MD–13),U.S. Environmental Protection Agency,Research Triangle Park, North Carolina27711.SUPPLEMENTARY INFORMATION: Regulatedentities. Entities potentially regulated bythis action are elastomer productprocess units (EPPUs) manufacturingthe same primary product and located ata plant site that is a major source ofHAP. Regulated categories and entitiesinclude:

Category Examples of regulated entities

Industry .... Producers of butyl rubber,halobutyl rubber,epichlorohydrin elastomers,ethylene propylene rubber,HypalonTM, neoprene, nitrilebutadiene rubber, nitrile buta-diene latex, polysulfide rubber,polybutadiene rubber/styrenebutadiene rubber by solution,styrene butadiene latex, andstyrene butadiene rubber byemulsion.

This table is not intended to beexhaustive, but rather provides a guidefor readers regarding entities likely to beregulated by this action. This table liststhe types of entities that EPA is nowaware could potentially be regulated bythis action. Other types of entities notlisted in the table could also beregulated. To determine whether yourfacility is regulated by this action, youshould carefully examine theapplicability criteria in § 63.480 of therule. If you have questions regarding theapplicability of this action to aparticular entity, consult the personlisted in the preceding FOR FURTHERINFORMATION CONTACT section.

Response to Comment Document. Theresponse to comment document for thepromulgated standards contains: (1) Asummary of the public comments madeon the proposed standards and theAdministrator’s response to thecomments; and (2) A summary of thechanges made to the standards sinceproposal. The document may beobtained from the U.S. EPA Library(MD–35), Research Triangle Park, NorthCarolina 27711, telephone (919) 541–2777; or from the National TechnicalInformation Services, 5285 Port RoyalRoad, Springfield, Virginia 22151,telephone (703) 487–4650. Please referto ‘‘Hazardous Air Pollutant Emissionsfrom Process Units in the ElastomersManufacturing Industry—Basis andPurpose Document for Final Standards,Summary of Public Comments and

46907Federal Register / Vol. 61, No. 173 / Thursday, September 5, 1996 / Rules and Regulations

Responses’’ (EPA–453/R–96–006b; May1996). This document is also located inthe docket (Docket Item No. V–C–1) andis available for downloading from theTechnology Transfer Network. TheTechnology Transfer Network is one ofthe EPA’s electronic bulletin boards.The Technology Transfer Networkprovides information and technologyexchange in various areas of airpollution control. The service is freeexcept for the cost of a phone call. Dial(919) 541–5742 for up to a 14,400 bpsmodem. If more information on theTechnology Transfer Network is needed,call the HELP line at (919) 541–5384.

Previous Background Documents. Thefollowing is a listing of backgrounddocuments pertaining to thisrulemaking. The complete title, EPApublication number, publication date,and docket number are included. Whereappropriate, the abbreviated descriptivetitle is used to refer to the documentthroughout this notice.

(1) Hazardous Air Pollutant Emissionsfrom Process Units in the ElastomerManufacturing Industry—Supplementary Information Documentfor Proposed Standards. EPA–453/R–95–005a, May 1995; Docket number A–92–44, item number III–B–2.

(2) Hazardous Air Pollutant Emissionsfrom Process Units in the ElastomerManufacturing Industry—Basis andPurpose Document for ProposedStandards. EPA–453/R–95–006a, May1995; Docket number A–92–44, itemnumber III–B–1.

Judicial Review. Under section307(b)(1) of the Act, judicial review ofthe final rule is available only by filinga petition for review in the U.S. Courtof Appeals for the District of ColumbiaCircuit within 60 days of today’spublication of this final rule. Undersection 307(b)(2) of the Act, therequirements that are the subject oftoday’s notice may not be challengedlater in civil or criminal proceedingsbrought by the EPA to enforce theserequirements.

The information presented in thispreamble is organized as follows:I. Summary of Considerations Made inDeveloping This StandardA. Background and Purpose of the

RegulationB. Source of AuthorityC. Technical Basis of RegulationD. Stakeholder and Public ParticipationII. Summary of Promulgated StandardsA. Storage Vessel ProvisionsB. Front-End Process Vent ProvisionsC. Back-end Process ProvisionsD. Wastewater ProvisionsE. Equipment Leak ProvisionsF. Emissions Averaging Provisions

G. Compliance and Performance TestProvisions and Monitoring Requirements

H. Recordkeeping and Reporting ProvisionsIII. Summary of ImpactsA. Facilities Affected by these NESHAPB. Primary Air ImpactsC. Other Environmental ImpactsD. Energy ImpactsE. Cost ImpactsF. Economic ImpactsIV. Significant Comments and Changes to theProposed StandardsA. Applicability Provisions and DefinitionsB. Storage Vessel ProvisionsC. Continuous Front-end Process Vent

ProvisionsD. Batch Front-end Process Vent ProvisionsE. Back-end Process Operation ProvisionsF. Wastewater Operations ProvisionsG. Equipment Leak ProvisionsH. Emissions Averaging ProvisionsI. MonitoringJ. Recordkeeping and ReportingV. Administrative RequirementsA. DocketB. Executive Order 12866C. Paperwork Reduction ActD. Regulatory Flexibility ActE. Small Business Regulatory Enforcement

Fairness Act of 1996 (SBREFA)F. Unfunded Mandates

I. Summary of Considerations Made inDeveloping This Standard

A. Background and Purpose ofRegulation

The Clean Air Act was created in part‘‘to protect and enhance the quality ofthe Nation’s air resources so as topromote the public health and welfareand the productive capacity of itspopulation’’ (CAA, section 101(b)(1)).Section 112(b) lists 189 HAP believed tocause adverse health or environmentaleffects. Section 112(d) requires thatemission standards be promulgated forall categories and subcategories of majorsources of these HAP and for manysmaller ‘‘area’’ sources listed forregulation, pursuant to section 112(c).Major sources are defined as those thatemit or have the potential to emit atleast 10 tons per year of any single HAPor 25 tons per year of any combinationof HAP.

On July 16, 1992 (57 FR 31576), theEPA published a list of categories ofsources slated for regulation. This listincluded all nine of the sourcecategories regulated by the standardsbeing promulgated today. The statuterequires emissions standards for thelisted source categories to bepromulgated between November 1992and November 2000. On December 3,1993, the EPA published a schedule forpromulgating these standards (58 FR83841). Standards for the nine sourcecategories covered by today’s rule were

proposed on June 12, 1995 (60 FR30801).

For the purpose of this rule, the EPAhas separated the 9 Group 1 polymersinto 12 elastomer products (i.e.,subcategories). These products are butylrubber (BR), halobutyl rubber (HBR),epichlorohydrin elastomers (EPI),ethylene propylene rubber (EPR),HypalonTM (HYP), neoprene (NEO),nitrile butadiene rubber (NBR), nitrilebutadiene latex (NBL), polysulfiderubber (PSR), polybutadiene rubber/styrene butadiene rubber by solution(PBR/SBRS), styrene butadiene latex(SBL), and styrene butadiene rubber byemulsion (SBRE).

In the 1990 Amendments to the CleanAir Act, Congress specified that eachstandard for major sources must requirethe maximum reduction in emissions ofHAP that the EPA determines isachievable, considering cost, non-airquality health and environmentalimpacts, and energy requirements. Inessence, these Maximum AchievableControl Technology (MACT) standardswould ensure that all major sources ofair toxics achieve the level of controlalready being achieved by the bettercontrolled and lower emitting sources ineach category. This approach providesassurance to citizens that each majorsource of toxic air pollution will berequired to employ good controlmeasures to limit its emissions.

Available emission data, collectedduring the development of this rule,shows that pollutants that are listed insection 112(b)(1) and are emitted byGroup I Polymer and Resins sourcesinclude n-hexane, styrene, 1,3-butadiene, acrylonitrile, methylchloride, carbon tetrachloride,chloroprene, and toluene. Some of thesepollutants are considered to be probablehuman carcinogens when inhaled, andall can cause reversible and irreversibletoxic effects following exposure. Theseeffects include respiratory and skinirritation, effects upon the eye, varioussystemic effects including effects uponthe liver, kidney, heart and circulatorysystems, neurotoxic effects, and inextreme cases, death.

The EPA does recognize that thedegree of adverse effects to health canrange from mild to severe. The extentand degree to which the health effectsmay be experienced is dependent upon(1) the ambient concentrations observedin the area (e.g., as influenced byemission rates, meteorologicalconditions, and terrain), (2) thefrequency of and duration of exposures,(3) characteristics of the exposedindividuals (e.g., genetics, age, pre-existing health conditions, and lifestyle)which vary significantly with the


population, and (4) pollutant specificcharacteristics (e.g., toxicity, half-life inthe environment, bioaccumulation, andpersistence).

Due to the volatility and relativelylow potential for bioaccumulation ofthese pollutants, air emissions are notexpected to deposit on land or waterand cause subsequent adverse health orecosystem effects.

The alternatives considered in thedevelopment of this regulation,including those alternatives selected asstandards for new and existingelastomer sources, are based on processand emissions data received from everyexisting elastomer facility known to bein operation at the time of the initialdata collection. During the developmentof today’s rule, the EPA met withindustry several times to discuss thisdata. In addition, facilities and Stateregulatory authorities had theopportunity to comment on draftversions of the proposed regulation andto provide additional information. TheEPA published the proposed rule forcomment on June 12, 1995 (60 FR30801). The public comments that werereceived on the proposed rule aresummarized in the Basis and PurposeDocument for Final Standards,Summary of Public Comments andResponses (Docket Item No. V–C–1).These comments were considered, andin some cases, today’s standards reflectthese comments. Of major concern tocommenters were the reporting andrecordkeeping burden and therequirements for back-end processoperations and wastewater control.

The final standards give existingsources 3 years from the date ofpromulgation to comply. Subject tocertain limited exceptions, this is themaximum amount of time allowedunder the Clean Air Act. New sourcesare required to comply with thestandard upon startup. The EPAbelieves these standards to beachievable for affected sources withinthe timeframes provided. The number ofexisting sources affected by this rule isless than 50; therefore, the EPA does notbelieve that required retrofits or otheractions cannot be achieved in the timeframe allotted.

Included in the final rule are methodsfor determining initial compliance as

well as monitoring, recordkeeping, andreporting requirements. All of thesecomponents are necessary to ensure thatsources will comply with the standardsboth initially and over time. However,the EPA has made every effort tosimplify the requirements in the rule.The Agency has also attempted tomaintain consistency with existingregulations by either incorporating textfrom existing regulations or referencingthe applicable sections, depending onwhich method would be least confusingfor a given situation.

As described in the ‘‘Basis andPurpose Document for ProposedStandards’’ (EPA–453/R–95–006a),regulatory alternatives were consideredthat included a combination ofrequirements equal to, and above, theMACT floor. Cost-effectiveness was afactor considered in evaluating optionsabove the floor; in cases where optionsmore stringent than the floor wereselected, they were judged to have areasonable cost effectiveness. Forepichlorohydrin rubber (EPR),polybutadiene rubber (PBR)/styrenebutadiene rubber (SBR) (by solution),and SBR (by emulsion) the estimatedcost effectiveness was found to berelatively high at the MACT floor leveldue to the requirements for processback-end operations. However, the back-end provisions of the regulation containseveral options for compliance that willallow facilities to select the most cost-effective option based on facility-specific considerations.

Representatives from other interestedEPA offices and programs are includedin the regulatory development processas members of the Work Group. TheWork Group is involved in theregulatory development process, andmust review and concur with theregulation before proposal andpromulgation. Therefore, the EPAbelieves that the implications to otherEPA offices and programs have beenadequately considered during thedevelopment of these standards.

B. Source of AuthorityNational emission standards for new

and existing sources of HAP establishedunder section 112(d) reflect MACT or

* * * the maximum degree of reduction inemissions of the HAP * * * that the

Administrator, taking into consideration thecost of achieving such emission reduction,and any nonair quality health andenvironmental impacts and energyrequirements, determines is achievable fornew or existing sources in the category orsubcategory to which such emission standardapplies * * * (42 U.S.C. 7412(d)(2)).

For new sources, section 112(d)(3)provides that the standards for a sourcecategory or subcategory ‘‘shall not beless stringent than the emission controlthat is achieved in practice by the bestcontrolled similar source, as determinedby the Administrator.’’ Section 112(d)(3)provides further that for existing sourcesthe standards shall be no less stringentthan the average emission limitationachieved by the best performing 12percent of the existing sources forsource categories and subcategories with30 or more sources or the averageemission limitation achieved by the bestperforming 5 sources for sourcecategories or subcategories with fewerthan 30 sources. These two minimumlevels of control define the MACT floorfor new and existing sources.

The regulatory alternatives consideredin the development of this regulation,including those regulatory alternativesselected as standards for new andexisting affected sources, are based onprocess and emissions data receivedfrom the existing plant sites known bythe EPA to be in operation.

As stated above, the MACT floorrepresents the least stringent standardpermitted by law for new and existingsources. The EPA may establishstandards more stringent than theMACT floor when it determines thatsuch standards are achievable, ‘‘takinginto consideration the cost of achievingsuch emission reduction, and anynonair quality health and environmentalimpacts, and energy requirements’’ (42U.S.C. 7412(d)(2)). In a few instances,the standards in today’s rule are morestringent than the MACT floor. In eachcase, the EPA determined, based onavailable data, that such standards wereachievable within the meaning ofsection 112(d). Table 1 shows thesubcategory-specific instances where anoption was selected that was morestringent than the MACT floor, alongwith the corresponding incrementalcost-effectiveness from the MACT floor.

TABLE 1.—INCREMENTAL COST EFFECTIVENESS VALUES OF REGULATORY OPTIONS MORE STRINGENT THAN THE MACTFLOOR a

Subcategory

Incremental cost effectiveness b ($/Mg)

Storage Front-end proc-ess vents

Back-end proc-ess Wastewater Equipment leaks

Butyl ............................................................... floor .................... $3,100 ................ floor .................... $1,600 ................. $1,700


TABLE 1.—INCREMENTAL COST EFFECTIVENESS VALUES OF REGULATORY OPTIONS MORE STRINGENT THAN THE MACTFLOOR a—Continued

Subcategory

Incremental cost effectiveness b ($/Mg)

Storage Front-end proc-ess vents

Back-end proc-ess Wastewater Equipment leaks

Epichlorohydrin .............................................. floor .................... floor .................... floor .................... floor ..................... $2,000Ethylene propylene ........................................ floor .................... floor .................... floor .................... floor ..................... $2,000Halobutyl ........................................................ $300 ................... $1,400 ................ floor .................... floor ..................... $1,100Hypalon ....................................................... floor .................... floor .................... floor .................... floor ..................... floorNeoprene ....................................................... floor .................... $2,900 ................ floor .................... floor ..................... c $1,600Nitrile butadiene latex .................................... floor .................... floor .................... floor .................... floor ..................... c $2,600Nitrile butadiene rubber ................................. floor .................... floor .................... floor .................... floor ..................... c $1,200Polybutadiene/styrene butadiene rubber by

solution.floor .................... floor .................... floor .................... floor ..................... c $2,600

Polysulfide ...................................................... floor .................... floor .................... floor .................... floor ..................... floorStyrene butadiene latex ................................. floor .................... floor .................... floor .................... floor ..................... floorStyrene butadiene rubber by emulsion ......... floor .................... floor .................... floor .................... floor ..................... floor

a In the table, ‘‘floor’’ indicates that the level of the promulgated standard is equivalent to the MACT floor.b The incremental cost effectiveness reflects the cost and emission reduction from the MACT floor to the level of the promulgated standard.c Equipment leak control programs at elastomer production facilities consisted of a complex combination of controls for the numerous compo-

nents that can leak and cause HAP emissions. This complexity made it impractical to define a MACT floor ‘‘program’’ for which impacts could beassessed for multiple-plant subcategories. Therefore, the cost effectiveness values shown in the table represent the incremental cost effective-ness values from baseline.

C. Technical Basis of RegulationPotential regulatory alternatives were

developed based on the HazardousOrganic NESHAP (HON) (subparts F, G,and H of 40 CFR part 63), and the BatchProcesses Alternative ControlTechniques (ACT) document (EPA 453/R–93–017; November 1993). The HONwas selected as a basis for regulatoryalternatives because: (1) Thecharacteristics of the emissions fromstorage vessels, continuous front-endprocess vents, equipment leaks, andwastewater at Group I elastomerfacilities are similar or identical to thoseaddressed by the HON; and (2) thelevels of control required under theHON were already determined throughextensive analyses to be reasonable froma cost and impact perspective.

Finally, the Batch Processes ACT wasselected to identify regulatoryalternatives for batch process vents,which are not addressed by the HON.The Batch Processes ACT addresses thecontrol of VOC emissions, and all of theorganic HAP identified for the Group Ielastomers facilities are also VOC.Unlike the HON, the Batch ProcessesACT is not a regulation and, therefore,does not specify a level of control thatmust be met. Instead, the BatchProcesses ACT provides information onpotential levels of control, their costs,etc. Based on the review of the BatchProcesses ACT, the EPA selected a levelof control equivalent to 90 percentreduction for batch front-end processvents. This level of control was selectedfor regulatory analysis purposes becauseit represents a reasonable level ofcontrol considering costs and otherimpacts.

D. Stakeholder and Public ParticipationIn the development of this standard,

numerous representatives of theelastomers industry were consulted.Industry representatives have includedtrade associations and elastomerproducers responding to section 114questionnaires and informationcollection requests (ICR’s). The EPA alsoreceived input from representativesfrom State and Regional environmentalagencies. Representatives from otherinterested EPA offices and programsparticipated in the regulatorydevelopment process as members of theWork Group. The Work Group isinvolved in the regulatory developmentprocess, and is given opportunities toreview and comment on the standardsbefore proposal and promulgation.Therefore, the EPA believes that theimpact on other EPA offices andprograms has been adequatelyconsidered during the development ofthese standards. In addition, the EPAhas met with members of industryconcerning these standards. Finally,industry representatives, regulatoryauthorities, and environmental groupshad the opportunity to comment on theproposed standards and to provideadditional information during thepublic comment period that followedproposal.

The standards were proposed in theFederal Register on June 12, 1995 (60FR 30801). The preamble to theproposed standards described therationale for the proposed standards.Public comments were solicited at thetime of proposal. To provide interestedpersons the opportunity for oralpresentation of data, views, or

arguments concerning the proposedstandards, a public hearing was offeredat proposal. However, the public did notrequest a hearing and, therefore, onewas not held. The public commentperiod was from June 12, 1995 toAugust 11, 1995. A total of twenty-ninecomment letters were received.Commenters included industryrepresentatives and State agencies. Thecomments were carefully considered,and changes were made in the proposedstandards when determined by the EPAto be appropriate. A detailed discussionof these comments and responses can befound in the Basis and PurposeDocument for Final Standards, which isreferenced in the ADDRESSES section ofthis preamble. The summary ofcomments and responses in the Basisand Purpose Document for the FinalStandards serves as the basis for therevisions that have been made to thestandards between proposal andpromulgation. Section IV of thispreamble discusses some of the majorchanges made to the standards.

II. Summary of Promulgated StandardsEmissions of specific organic HAP

from the following types of emissionpoints (i.e., emission source types) arebeing covered by the final standard:Storage vessels, continuous front-endprocess vents, batch front-end processvents, back-end processes operations,equipment leaks, and wastewateroperations. The organic HAP emittedand required to be controlled by thesestandards vary by subcategory. Each ofthe twelve elastomer productsconstitutes a separate subcategory, eachof which belongs to one of the nine


source categories regulated by thesestandards.

The existing affected source is definedas each group of one or more EPPUs thatmanufacture the same elastomerproduct as their primary product, and(1) are located at a major source plantsite, (2) are not exempt, and (3) are notpart of a new affected source. Thismeans that each plant site will haveonly one existing affected source in anygiven subcategory.

If a plant site with an existing affectedsource producing elastomer A as itsprimary product constructs a new EPPUalso producing elastomer A as itsprimary product, the new EPPU is anew affected source if the new EPPUhas the potential to emit more than 10tons per year of a single HAP, or 25 tonsper year of all HAP. In this situation, theplant site would have an existingaffected source producing elastomer A,and a new affected source producingelastomer A. Each subsequent newEPPU with potential HAP emissionsabove the levels cited above would bea separate new affected source.

New affected sources are also createdwhen an EPPU is constructed at a majorsource plant site where the elastomerproduct was not previously produced,with no regard to the potential HAPemissions from the EPPU. Anotherinstance where a new affected source iscreated is if a new EPPU is constructedat a new plant site (i.e., green field site)that will be a major source. The final

manner in which a new affected sourceis created is when an existing affectedsource undergoes reconstruction, thusmaking the previously existing sourcesubject to new source standards.

With relatively few exceptions, thefinal standards for storage vessels,continuous front-end process vents,equipment leaks, and wastewaterstreams are the same as thosepromulgated for the correspondingtypes of emission points at facilitiessubject to the HON. As shown in Tables2 and 3, some subcategories haverequirements that differ from the HON;these cases are designated by ‘‘MACTFloor.’’ These different requirements arespecified in the final standards.

As in the HON, if an emission pointwithin an affected source meets theapplicability criteria and is required tobe controlled under the standard, it isreferred to as a Group 1 emission point.If an emission point within the affectedsource is not required to apply controls,it is referred to as a Group 2 emissionpoint.

A. Storage Vessel Provisions

For all subcategories, the storagevessel requirements are identical to theHON storage vessel requirements insubpart G. A storage vessel means a tankor other vessel that is associated with anelastomer product process unit and thatstores a liquid containing one or moreorganic HAP. The rule specifiesassignment procedures for determining

whether a storage vessel is associatedwith an elastomer product process unit.The storage vessel provisions do notapply to the following: (1) Vesselspermanently attached to motor vehicles,(2) pressure vessels designed to operatein excess of 204.9 kpa (29.7 psia) andwithout emissions to the atmosphere,(3) vessels with capacities smaller than38 m3 (10,000 gal), (4) vessels andequipment storing and/or handlingmaterial that contains no detectableorganic HAP, and/or organic HAP asimpurities only, (5) surge control vesselsand bottoms receiver tanks, and (6)wastewater storage tanks. An impurityis produced coincidentally with anotherchemical substance and is processed,used, or distributed with it.

In addition to those vessels that donot meet the definition of storagevessels, the standards exempt certainstorage vessels containing latex.Specifically, storage vessels containing alatex, located downstream of thestripping operations, all storage vesselscontaining styrene butadiene latex, andstorage vessels containing styrene,acrylamide, and epichlorohydrin, areexempt from the storage vesselrequirements of the final rule.

The owner or operator mustdetermine whether a storage vessel isGroup 1 or Group 2; Group 1 storagevessels require control. The criteria fordetermining whether a storage vessel isGroup 1 or Group 2 are the same as theHON criteria.

TABLE 2.—SUMMARY OF FINAL STANDARDS FOR EXISTING AFFECTED SOURCES

Subcategory

Level of final standard a

Storage Front-end process ventsBack-end

process emis-sions

Wastewater Equipmentleaks

BR, HBR ............................. HON .............. HON/ACT, exempting halogenated ventstreams controlled by flare or boiler beforeJune 12, 1995.

no control ...... HON ............... HON.

EPI, HYP, NEO, NBL, NBR,PSR, SBL.

HON .............. HON/ACT ........................................................ no control ...... HON ............... HON.

EPR .................................... HON .............. HON/ACT, exempting halogenated ventstreams controlled by flare or boiler beforeJune 12, 1995.

MACT floorresidualHAP limit.

HON ............... HON.

PBR/SBRS, SBRE .............. HON .............. HON/ACT ........................................................ MACT floorresidualHAP limit.

HON ............... HON.

a HON=the level of the standard is equivalent to existing source provisions of subpart G of 40 CFR 63 for storage and wastewater, and subpartH of 40 CFR 63 for equipment leaks.

HON/ACT=the level of the standard for continuous front-end process vents is equal to the existing source process vent provisions in subpart Gof 40 CFR 63, and the level of the standard for batch front-end process vents is equal to the 90 percent control level from the Batch ProcessesACT.


TABLE 3.—SUMMARY OF FINAL STANDARDS FOR NEW AFFECTED SOURCES

Subcategory

Level of standard a

Storage Front-end processvents

Back-end processemissions Wastewater Equipment leaks

BR, EPI, HBR, HYP, NEO,NBL, NBR, SBL.

New source HON ... New source HON/ACT.

No control ............... Existing sourceHON.

New source HON

EPR, PBR/SBRS, SBRE .......... New source HON ... New source HON/ACT.

New source floorresidual HAP limit.

Existing sourceHON.

New source HON

a HON=the level of the standard is equivalent to the provisions of subpart G of 40 CFR 63 for storage and wastewater, and subpart H of 40CFR 63 for equipment leaks.

HON/ACT=the level of the standard for continuous front-end process vents is equal to the new source process vent provisions in subpart G of40 CFR 63, and the level of the standard for batch front-end process vents is equal to the 90 percent control level from the Batch ProcessesACT.

The storage provisions require thatone of the following control systems beapplied to Group 1 storage vessels: (1)An internal floating roof with properseals and fittings; (2) an external floatingroof with proper seals and fittings; (3)an external floating roof converted to aninternal floating roof with proper sealsand fittings; or (4) a closed vent systemwith a 95-percent efficient controldevice. The storage provisions givedetails on the types of seals and fittingsrequired. Monitoring and complianceprovisions include periodic visualinspections of vessels, roof seals, andfittings, as well as internal inspections.If a closed vent system and controldevice is used, the owner or operatormust establish appropriate monitoringprocedures. Reports and records ofinspections, repairs, and otherinformation necessary to determinecompliance are also required by thestorage provisions. No controls arerequired for Group 2 storage vessels.

B. Front-End Process Vent Provisions

There are separate provisions in therule for front-end process vents thatoriginate from unit operations operatedin a continuous mode, and those fromunit operations operated in a batchmode. An affected source could besubject to both the continuous and batchfront-end process vent provisions iffront-end operations at an elastomerproduction process unit consist of acombination of continuous and batchunit operations. The continuousprovisions would be applied to thosevents from continuous unit operations,and the batch provisions to vents frombatch unit operations.

1. Continuous Front-End Process VentProvisions

The provisions in the final rule forcontinuous front-end process vents arethe same as the HON process ventprovisions in subpart G. Continuousfront-end process vents are gas streamsthat originate from continuously

operated units in the front-end of anelastomer process, and include gasstreams discharged directly to theatmosphere and gas streams dischargedto the atmosphere after diversionthrough a product recovery device. Thecontinuous front-end process ventprovisions apply only to vents that emitgas streams containing more than 0.005weight-percent HAP.

A Group 1 continuous front-endprocess vent is defined as a continuousfront-end process vent with a flow rategreater than or equal to 0.005 scmm, anorganic HAP concentration greater thanor equal to 50 ppmv, and a totalresource effectiveness (TRE) index valueless than or equal to 1.0. The continuousfront-end process vent provisionsrequire the owner or operator of a Group1 continuous front-end process ventstream to: (1) Reduce the emissions oforganic HAP using a flare; (2) reduceemissions of organic HAP by 98 weight-percent or to a concentration of 20ppmv or less; or (3) achieve andmaintain a TRE index above 1.Performance test provisions areincluded for Group 1 continuous front-end process vents to verify that thecontrol device achieves the requiredperformance.

The organic HAP reduction is basedon the level of control achieved by thereference control technology. Group 2continuous front-end process ventstreams with TRE index values between1.0 and 4.0 are required to monitorthose process vent streams to ensurethose streams do not become Group 1,which require control.

The owner or operator can calculate aTRE index value to determine whethereach process vent is a Group 1 or Group2 continuous front-end process vent, orthe owner or operator can elect tocomply directly with the controlrequirements without calculating theTRE index. The TRE index value isdetermined after the final recoverydevice in the process or prior to ventingto the atmosphere. The TRE calculation

involves an emissions test orengineering assessment and use of theTRE equations in § 63.115 of subpart G.

The rule encourages pollutionprevention through product recoverybecause an owner or operator of a Group1 continuous front-end process ventmay add recovery devices or otherwisereduce emissions to the extent that theTRE becomes greater than 1.0 and theGroup 1 continuous front-end processvent becomes a Group 2 continuousfront-end process vent.

Group 1 halogenated streamscontrolled using a combustion devicemust vent the emissions from thecombustor to an acid gas scrubber orother device to limit emissions ofhalogens prior to venting to theatmosphere. The control device mustreduce the overall emissions ofhydrogen halides and halogens by 99percent or reduce the outlet massemission rate of total hydrogen halidesand halogens to less than 0.45 kg/hr.

The rule exempts certain halogenatedprocess vent streams from therequirement to control the halogens atthe exit from a combustion device.Specifically, halogenated continuousfront-end process vents at existingaffected sources producing butyl rubber,halobutyl rubber, or ethylene-propylenerubber are exempt from therequirements to control hydrogenhalides and halogens from the outlet ofcombustion devices. However, the rulerequires that these vent streams becontrolled in accordance with the otherGroup 1 requirements for continuousfront-end process vents.

Monitoring, reporting, andrecordkeeping provisions necessary todemonstrate compliance are alsoincluded in the continuous front-endprocess vent provisions. Compliancewith the monitoring provisions is basedon a comparison of daily averagemonitored values to enforceableparameter ‘‘levels’’ established by theowner or operator.


2. Batch Front—End Process VentProvisions

Process vents that include gas streamsoriginating from batch unit operationsin the front-end of an elastomer productprocess unit are subject to the batchfront-end process vent provisions of therule. Consistent with provisions in therule for other emission source types,batch front-end process vents areclassified as Group 1 or Group 2, withcontrol being required for Group 1 batchfront-end process vents.

An important aspect of the batchfront-end process vent provisions is thatapplicability is on an individual ventbasis. All batch emission episodes thatare emitted to the atmosphere throughthe vent are to be considered in thegroup determination. The rule does notrequire that emissions from similarbatch unit operations emitted fromdifferent vents be combined forapplicability determinations. In otherwords, if a process included four batchreactors, and each reactor had adedicated vent to the atmosphere,applicability would be determined foreach reactor.

The applicability criteria of the batchfront-end process vent provisions arefrom the Batch Processes ACT, and arebased on annual emissions of the HAPemitted from the vent, and the averageflow rate of the vent stream. The ventstream characteristics are determined atthe exit from the batch unit operationbefore any emission control or recoverydevice. The rule specifies that refluxcondensers, condensers recoveringmonomer or solvent from a batchstripping operation, and condensersrecovering monomer or solvent from abatch distillation operation areconsidered part of the unit operation.Therefore, the batch front-end processvent applicability criteria would beapplied after these condensers.

The first step in the applicabilitydetermination is to calculate the annualHAP emissions. Annual HAP emissionsmay be calculated using equationscontained in the regulation (which arefrom the Batch Processes ACT). Testingor engineering assessment may also beused if the equations are notappropriate. Batch front-end processvents with annual HAP emissions lessthan 225 kilograms per year are exemptfrom all batch front-end process ventrequirements, other than therequirement to estimate annual HAPemissions.

There are two tiers of Group 2 batchfront-end process vents. First, if theannual HAP emissions of a vent arebelow specified cutoff levels, the batchfront-end process vent is classified as a

Group 2 vent, and a batch cyclelimitation must be established(discussed below). The cutoff emissionlevel is 11,800 kilograms HAP per year.

If annual HAP emissions are greaterthan the cutoff emission level specifiedabove, the owner must determine theannual average flow rate of the batchfront-end process vent, and the ‘‘cutoffflow rate’’ using the equation in§ 63.488(f). The Group 1/Group 2classification is then based on acomparison between the actual annualaverage flow rate, and the cutoff flowrate. If the actual flow rate is less thanthe calculated cutoff flow rate, then thebatch process vent is a Group 1 vent,and control is required. If the actualflow rate is greater than the calculatedcutoff flow rate, then the batch processvent is a Group 2 batch front-endprocess vent, and the owner or operatormust establish a batch cycle limitation.

Owners and operators of Group 2batch front-end process vents mustestablish a batch cycle limitation thatensures that HAP emissions from thevent do not increase to a level thatwould make the batch front-end processvent Group 1. The batch cycle limitationis an enforceable restriction on thenumber of batch cycles that can beperformed in a year. An owner oroperator has two choices regarding thelevel of the batch cycle limitation. Thelimitation may be set to maintainemissions below the annual emissioncutoff level listed above, or thelimitation may be set to ensure thatannual emissions do not increase to alevel that makes the calculated cutoffflow rate increase beyond the actualannual average flow rate. The advantageto the first option is that the owner oroperator would not be required todetermine the annual average flow rateof the vent. A batch cycle limitationdoes not limit production to anyprevious production level, but is basedon the number of cycles necessary toexceed one of the two batch front-endprocess vent applicability criteriadiscussed above.

The batch front-end process ventprovisions require the owner or operatorof a Group 1 batch front-end processvent stream to: (1) Reduce the emissionsof organic HAP using a flare or (2)reduce emissions of organic HAP by 90weight-percent over each batch cycleusing a control or recovery device. If ahalogenated batch vent stream (definedas a vent that has a mass emission rateof halogen atoms in organic compoundsof 3,750 kilograms per year or greater)is sent to a combustion device, theoutlet stream must be controlled toreduce emissions of hydrogen halidesand halogens by 99 percent. Control

could be achieved at varying levels fordifferent emission episodes as long asthe required level of control for thebatch cycle was achieved. The owner oroperator could even elect to controlsome emission episodes and by-passcontrol for others. Performance testprovisions are included for Group 1batch front-end process vents to verifythat the control device achieves therequired performance.

Monitoring, reporting, andrecordkeeping provisions necessary todemonstrate compliance are alsoincluded in the batch front-end processvent provisions. These provisions aremodeled after the analogous continuousprocess vent provisions in the HON.Compliance with the monitoringprovisions is based on a comparison ofbatch cycle daily average monitoredvalues to enforceable parametermonitoring levels established by theowner or operator.

The provisions for batch front-endprocess vents contain three conditionsthat can greatly simplify compliance.First, an owner or operator can controla batch front-end process vent inaccordance with the Group 1 batchfront-end process vent requirements andbypass the applicability determination.Second, if a batch front-end processvent is combined with a continuousvent stream before a recovery or controldevice, the owner or operator is exemptfrom all batch front-end process ventrequirements. However, applicabilitydeterminations and performance testsfor the continuous vent must beconducted at conditions when theaddition of the batch vent streamsmakes the HAP concentration in thecombined stream greatest. Finally, ifbatch front-end process vents combineto create a ‘‘continuous’’ flow to acontrol or recovery device, the lesscomplicated continuous process ventmonitoring requirements are used.

C. Back-End Process ProvisionsBack-end process operations include

all operations at an EPPU that occurafter the stripping operations. Theseoperations include, but are not limitedto, filtering, drying, separating, andother finishing operations, as well asproduct storage.

The back-end process provisionscontain residual HAP limitations forthree subcategories: EPR, PBR/SBRS,and SBRE. The limitations for EPR andPBR/SBRS are in units of kilogramsHAP per megagram of crumb rubber dryweight (crumb rubber dry weight meansthe weight of the polymer, minus theweight of water and residual organics),and the limitation for SBRE is in unitsof kilogram HAP per megagram latex.


The limitation is a monthly averageweighted based on the weight of rubberor latex processed in the stripper. Twomethods of compliance are available: (1)Stripping the polymer to remove theresidual HAP to the levels in thestandards, on a monthly weightedaverage basis, or (2) reducing emissionsusing add-on control to a levelequivalent to the level that would beachieved if stripping was used.

1. Compliance Using StrippingTechnology

If stripping is the method ofcompliance selected, the rule allowstwo options for demonstratingcompliance: by sampling and bymonitoring stripper operatingparameters. If compliance isdemonstrated by sampling, samples ofthe stripped wet crumb or stripped latexmust be taken as soon as safe andfeasible after the stripping operation,but no later than the entry point for thefirst unit operation following thestripper (e.g., the watering screen), andanalyzed to determine the residual HAPcontent. For styrene-butadiene rubberproduced by the emulsion process, thesample of latex shall be taken just priorto entering the coagulation operations.

A sample must be taken once per dayfor continuous processes, or once perbatch for batch processes. The samplemust be analyzed to determine theresidual HAP content, and thecorresponding weight of rubber or latexprocessed in the stripper must berecorded. This information is then usedto calculate a monthly weightedaverage. A monthly weighted averagethat is above the limitation is a violationof the standard, as is a failure to sampleand analyze at least 75 percent of thesamples required during the month. TheEPA is in the process of approving testmethods that will be used to determinecompliance with the standard. Thesemethods are being promulgatedseparately by the EPA. Records of eachtest result would be required, along withthe corresponding weight of thepolymer processed in the stripper.Records of the monthly weightedaverages must also be maintained.

An owner or operator complyingusing stripping can also demonstratecompliance by continuously monitoringstripper operating parameters. If usingthis approach, the owner or operatormust establish stripper operatingparameters for each grade of polymerprocessed in the stripper, along with thecorresponding residual HAP content ofthat grade. The parameters that must bemonitored include, at a minimum,temperature, pressure, steaming rates(for steam strippers), and some

parameter that is indicative of residencetime. The HAP content of the grademust be determined initially using theresidual HAP test methods discussedabove. The owner or operator can electto establish a single set of stripperoperating parameters for multiplegrades.

The EPA believes that computerpredictive modeling may be anattractive alternative to the periodicsampling and stripper parametricmonitoring options in the rule, but didnot specifically include provisions forthese options, because the use ofcomputer predictive modeling is so site-specific that it was not possible toinclude general requirements for its usein subpart U. However, the rule doesallow the opportunity for site-specificapproval of the use of computerpredictive modeling, stack testmonitoring, or other alternative meansof compliance through the submittal ofan alternative compliance plan.

The difference in the demonstrationof compliance by sampling, and thedemonstration of compliance bymonitoring stripping parameters, is thatthe monitoring option is entirely basedon a grade or batch. To further explain,if a particular grade of polymer isprocessed in the stripper continuouslyfor 32 hours, a sample of that grade isrequired to be taken each operating day,if the sampling compliancedemonstration option is selected.However, if the stripping parametermonitoring option is selected, the entirelength of time the grade is beingprocessed in the stripper is treated as asingle unit.

During the operation of the stripper,the parameters must be continuouslymonitored, with a reading of eachparameter taken at least once every 15minutes. If, during the processing of agrade, all hourly average parametervalues are in accordance with theestablished levels, the owner or operatorcan use the HAP content determinedinitially in the calculation of themonthly weighted average, andsampling is not required. However, ifone hourly average value for anyparameter is not in accordance with theestablished operating parameter, asample must be taken and the HAPcontent determined using specified testmethods.

Records of the initial residual HAPcontent results, along with thecorresponding stripper parametermonitoring results for the sample, mustbe maintained. The hourly averagemonitoring results are required to bemaintained, along with the results ofany HAP content tests conducted due toexceedance of the established parameter

monitoring levels. Records must also bekept of the weight of polymer processedin each grade, and the monthlyweighted average values.

If complying with the residual HAPlimitations using stripping technology,and demonstrating compliance bymonitoring stripper parameters, thereare three ways a facility can be inviolation of the standard. First, amonthly weighted average that is abovethe limitation is a violation of thestandard, as is a failure to sample andanalyze a sample for a grade with anhourly average parameter value not inaccordance with the establishedmonitoring parameter levels. The thirdway for a facility to be out ofcompliance is if the stripper monitoringdata are not sufficient for at least 75percent of the grades produced duringthe month. Stripper data are consideredinsufficient if monitoring parameters areobtained for less than 75 percent of the15-minute periods during the processingof a grade.

2. Compliance Using Add-On ControlIf add-on control is the method of

compliance selected, there are twolevels of compliance. Initial complianceis based on a source test, andcontinuous compliance is based on thedaily average of parameter monitoringresults for the control or recoverydevice.

The initial performance test mustconsist of three 1-hour runs or threecomplete batch cycles, if the duration ofthe batch cycle is less than 1 hour. Thetest runs must be conducted duringprocessing of ‘‘worst-case’’ grade, whichmeans the grade with the highestresidual HAP content leaving thestripper. The ‘‘uncontrolled’’ residualHAP content in the latex or wet crumbrubber must be determined, using thetest methods, after the stripper. Then,when the crumb for which theuncontrolled residual HAP wasdetermined is being processed in theback-end unit operation beingcontrolled, the inlet and outletemissions for the control or recoverydevice must be determined usingMethod 18 or Method 25A. Theuncontrolled HAP content is thenadjusted to account for the reduction inemissions by the control or recoverydevice, and compared to the levels inthe standard. For initial compliance, theadjusted residual HAP content level foreach test run must be less than the levelin today’s standards.

During the initial test, the appropriateparameter must be monitored, and anenforceable ‘‘level’’ established as amaximum or minimum operatingparameter based on this monitoring. As


with continuous front-end processvents, the level is established as theaverage of the maximum (or minimum)point values for the three test runs.

Continuous monitoring must beconducted on the control or recoverydevice, and compliance is based on thedaily average of the monitoring results.The monitoring, recordkeeping, andreporting provisions are the same as theprocess vent provisions in the HON,which are required for continuous front-end process vents in today’s finalstandard.

3. Carbon Disulfide Limitations ForStyrene Butadiene Rubber By EmulsionProducers

Today’s regulation would reducecarbon disulfide (CS2) emissions fromstyrene butadiene rubber producersusing an emulsion process by limitingthe concentration of CS2 in the dryervent stacks to 45 ppmv. Sulfur-containing shortstopping agents used toproduce certain grades of rubber havebeen determined to be the source of CS2

in the dryer stacks. Owners or operatorswould be required to develop standardoperating procedures for each grade thatuses a sulfur-containing shortstoppingagent. These standard operatingprocedures would specify the type andamount of agent added, and the point inthe process where the agent is added.One standard operating procedure canbe used for more than one grade ifpossible.

The owner or operator is required tovalidate each standard operatingprocedure through either a performancetest or a demonstration usingengineering assessment. The facilitywould be in compliance with this theregulation if the appropriate standardoperating procedure is followedwhenever a sulfur-containingshortstopping agent is used. Facilitiesthat route dryer vents to a combustiondevice would be exempt from § 63.500of the regulation.

D. Wastewater ProvisionsExcept for back-end wastewater

streams originating from equipment thatonly produces latex products and back-end wastewater streams at affectedsources that are subject to the residualorganic HAP limitation, the standardsrequire owners and operators to complywith the wastewater provisions in theHON. Owners and operators of new andexisting sources are required to make agroup determination for eachwastewater stream based on the existingsource applicability criteria in the HON:Flow rate and organic HAPconcentration. The level of controlrequired for Group 1 wastewater streams

is dependent upon the organic HAPconstituents in the wastewater stream.

The standards also require ownersand operators to comply with themaintenance wastewater requirementsin § 63.105 of subpart F. Theseprovisions require owners and operatorsto include a description of proceduresfor managing wastewaters generatedduring maintenance in their startup,shutdown, and malfunction plan.

E. Equipment Leak ProvisionsFor all subcategories, both existing

and new affected sources are required tocomply with the equipment leakstandards specified in subpart H of 40CFR part 63. In general, subpart Hrequires owners and operators toimplement a leak detection and repair(LDAR) program, including variouswork practice and equipment standards.The subpart H standards are applicableto equipment in volatile HAP service for300 or more hours per year (hr/yr). Thestandards define ‘‘in volatile organicHAP service’’ as being in contact withor containing process fluid that containsa total of 5 percent or more total HAP.Equipment subject to the standards are:Valves, pumps, compressors,connectors, pressure relief devices,open-ended valves or lines, samplingconnection systems, instrumentationsystems, agitators, surge control vessels,bottoms receivers, and closed-ventsystems and control devices.

A few differences to the subpart Hstandards are contained in this finalrule. These differences include notrequiring the submittal of an InitialNotification or Implementation Plan andallowing 150 days (rather than 90 days)to submit the Notification ofCompliance Status. In addition, theexemptions discussed earlier for storagevessels are also applicable for surgecontrol vessels and bottoms receivers.

Affected sources subject to today’sfinal rule and currently complying withthe NESHAP for Certain ProcessesSubject to the Negotiated Regulation forEquipment Leaks (40 CFR part 63,subpart I) are required to continue tocomply with subpart I until thecompliance date of this final rule, atwhich point in time they must complywith today’s rule and are no longersubject to subpart I. Further, affectedsources complying with subpart Ithrough a quality improvement programare allowed to continue these programswithout interruption as part ofcomplying with today’s rule. In otherwords, becoming subject to today’sstandards does not restart or reset the‘‘compliance clock’’ as it relates toreduced burden earned through aquality improvement program.

F. Emissions Averaging ProvisionsThe EPA is allowing emissions

averaging among continuous front-endprocess vents, batch front-end processvents, aggregate batch vents, back-endprocess operations, storage vessels, andwastewater streams within an existingaffected source. New affected sourcesare not allowed to use emissionsaveraging. Emissions averaging is notallowed between subcategories; it isonly allowed between emission pointswithin the same affected source. Underemissions averaging, a system of‘‘credits’’ and ‘‘debits’’ is used todetermine whether an affected source isachieving the required emissionreductions. Twenty emission points perplant site are allowed in the set ofemissions averaging plans submitted forthe plant site, with an additional 5emission points allowed if pollutionprevention measures are used.

G. Compliance and Performance TestProvisions and MonitoringRequirements

Compliance and performance testprovisions and monitoring requirementscontained in the final standards are verysimilar to those found in the HON. Eachtype of emission point included in thestandards is discussed briefly in thefollowing paragraphs. Also, significantdifferences from the parametermonitoring requirements found in theHON are discussed.

1. Storage VesselsMonitoring and compliance

provisions for storage vesselimprovements include periodic visualinspections of vessels, roof seals, andfittings, as well as internal inspections.If a control device is used, the owner oroperator must identify the appropriatemonitoring procedures to be followed inorder to demonstrate compliance.Monitoring parameters and proceduresfor many of the control devices likely tobe used are identified in the finalstandards. Reports and records ofinspections, repairs, and otherinformation necessary to determinecompliance are also required by thefinal standards.

2. Continuous Front-end Process VentsThe final standards for continuous

front-end process vents require theowner or operator to either calculate aTRE index value to determine the groupstatus of each continuous front-endprocess vent or to comply with thecontrol requirements. The TRE indexvalue is determined after the lastrecovery device in the process or priorto venting to the atmosphere. The TREcalculation involves an emissions test or


engineering assessment and use of theTRE equations specified in the finalstandards.

Performance test provisions areincluded for Group 1 continuous front-end process vents to verify that controldevices or recovery achieve the requiredperformance. Monitoring provisionsnecessary to demonstrate complianceare also included in the standards.

3. Batch Front-End Process Vents

Similar to the provisions forcontinuous front-end process vents,there is a procedure for determining thegroup status of batch front-end processvents. This procedure is based onannual emissions and annual averageflow rate of the batch front-end processvent. Equations for estimating andprocedures for measuring annualemissions and annual average flow ratesare provided in the final standards. Theuse of engineering assessment for thegroup determination is also allowed.

Performance test provisions areincluded for Group 1 batch front-endprocess vents to verify that controldevices achieve the requiredperformance. Monitoring provisionsnecessary to demonstrate complianceare also included in the final standard.

For Group 2 batch front-end processvents, the standard requires owners andoperators to establish a batch cyclelimitation. The batch cycle limitationrestricts the number of batch cycles thatcan be accomplished per year. Thisenforceable limitation ensures that aGroup 2 batch front-end process ventdoes not become a Group 1 batch front-end process vent as a result of runningmore batch cycles than anticipatedwhen the group determination wasmade. The determination of the batchcycle limitation is not tied to anyprevious production amounts. Anaffected source may set the batch cyclelimitation at any level it desires as longas the batch front-end process ventremains a Group 2 batch front-endprocess vent. Alternatively thestandards would allow owners oroperators to declare any Group 2 batchfront-end process vent to be a Group 1batch front-end process vent. In suchcases, control of the batch process front-end vent is required.

4. Back-End Process Vents

The final rule specifies theperformance tests, test methods (withthe exception of residual HAP referencetest methods), and monitoringrequirements necessary to determinethat the allowed back-end emissionlimitations are achieved. The followingparagraphs discuss each of these.

Performance tests and test methodsfor residual HAP limitations. Initialperformance tests, in the traditionalsense, are required for facilitiescomplying with the back-end operationsprovisions using add-on control. Testingis required for all control and recoverydevices, other than flares and certainboilers and process heaters. The back-end process provisions require the useof approved test methods.

Initial tests are required for facilitiescomplying by using stripper parametermonitoring. The purpose of this initialtesting is to establish correlationsbetween residual HAP contents andstripper operating parameters. Within afew months of the promulgation of thisregulation, the EPA will promulgate testmethods for determining the residualHAP content in crumb and latex.

If an owner or operator complies withthe back-end standards by sampling,periodic sampling and testing isrequired. The residual HAP testmethods would also be used for theseanalyses.

Performance tests and test methodsfor carbon disulfide emission limitationsfor SBRE facilities. Initial performancetests are one option for ‘‘verifying’’ eachstandard operating procedure as anacceptable procedure that results incarbon disulfide concentrations of 45ppmv or less in the dryer stacks at SBREfacilities. Standard operating proceduresmay also be verified throughengineering assessments. If theperformance testing option is selected,one performance test is required foreach standard operating procedure.Method 18 or 25A is specified tomeasure the carbon disulfideconcentration. Additional verificationsare not required unless a new standardoperating procedure is added, or anexisting standard operating procedure isrevised.

Monitoring requirements. Control andrecovery devices and strippers used tocomply with the final rule need to bemaintained and operated properly if therequired level of control is to beachieved on a continuing basis.Monitoring of control and recoverydevice and stripper parameters can beused to ensure that such properoperation and maintenance areoccurring.

For control and recovery devices, theback-end process operation standarduses the same list of parametersdiscussed above for continuous front-end process vents. For strippers, theregulation requires the monitoring oftemperature, pressure, steaming rates,and a parameter indicative of residencetime.

5. Wastewater

For demonstrating compliance withthe various requirements, the finalstandard allows the owners or operatorsto either conduct performance tests or todocument compliance using engineeringcalculations. Appropriate complianceand monitoring provisions are includedin the final standard.

6. Equipment Leaks

The final standard retains the use ofMethod 21 to detect leaks. Method 21requires a portable organic vaporanalyzer to monitor for leaks fromequipment in use. A ‘‘leak’’ is aconcentration specified in the regulationfor the type of equipment beingmonitored and is based on theinstrument response to methane (thecalibration gas) in the air. The observedscreening value may require adjustmentfor the response factor relative tomethane if the weighted response factorof the stream exceeds a specifiedmultiplier. The final rule requires theuse of Method 18 or Method 25A todetermine the organic content of aprocess stream. To test for leaks in abatch system, test procedures usingeither a gas or a liquid for pressuretesting the batch system are specified totest for leaks.

7. Continuous Parameter Monitoring

The final standards require owners oroperators to establish parametermonitoring levels. The standardsprovide the owner or operator theflexibility to establish the levels basedon site-specific information. Site-specific levels can best accommodatevariation in emission pointcharacteristics and control devicedesigns. Three procedures forestablishing these levels are provided inthe final standards. They are based onperformance tests; engineeringassessments, performance tests, and/ormanufacturer’s recommendations; andengineering assessments and/ormanufacturer’s recommendations.While the establishment of a level basedsolely on performance tests ispreapproved by the Administrator,values determined using the last twoprocedures, which may or may not usethe results of performance tests, must beapproved by the Administrator for eachindividual case.

The final standards require theavailability of at least 75 percent ofmonitoring data to constitute a validday’s worth of data for continuous andbatch front-end process vents. Failure tohave a valid day’s worth of monitoringdata is considered an excursion. Thecriteria for determining a valid day’s or


hour’s worth of data are provided in thefinal standards. A certain number ofexcused excursions have been allowedfor in the final standards; theseprovisions are the same as theprovisions in the HON. The standardsallow a maximum of 6 excusedexcursions for the first semiannualreporting period, decreasing by 1excursion each semiannual reportingperiod. Starting with the sixthsemiannual reporting period (i.e., theend of the third year of compliance) andthereafter, affected sources are allowedone excused excursion per semiannualreporting period. As is always the case,a State has the discretion to imposemore stringent requirements than therequirements of NESHAP and otherfederal requirements and could choosenot to allow the excused excursionprovisions contained in these finalstandards.

H. Recordkeeping and ReportingProvisions

The final standards require owners oroperators of affected sources to maintainrequired records for a period of at least5 years. The final standards require thatthe following reports be submitted, asapplicable: (1) Precompliance Report,(2) Emissions Averaging Plan, (3)Notification of Compliance Statusreport, (4) Periodic Reports, and (5)other reports (e.g., notifications ofstorage vessel internal inspections).

Specific recordkeeping and reportingrequirements are specified in eachsection that addresses an individualemission point (e.g., § 63.486 for batch

front-end process vents). Therecordkeeping and reporting provisionsrelated to the affected source as a whole(e.g., types of reports, such as theNotification of Compliance Status) arefound in § 63.506. For example, § 63.491requires an owner or operator to recordthe batch cycle limitation for eachGroup 2 batch front-end process vent.Section 63.492 goes on to require theowner or operator to submit thisinformation in the Notification ofCompliance Status as specified in§ 63.506. Finally, § 63.506 requiressubmittal of the information specified in§ 63.492.

III. Summary of ImpactsThis section presents a summary of

the air, non-air environmental (wasteand solid waste), energy, cost, andeconomic impacts resulting from thecontrol of HAP emissions under thisfinal rule.

A. Facilities Affected by These NESHAPThe promulgated rule would affect

BR, EPI, EPR, HYP, NEO, NBR, PBR,PSR, and SBR facilities that are majorsources in themselves, or that arelocated at a major source. Based onavailable information, all of the facilitiesat which these elastomers are producedwere judged to be major sources for thepurpose of developing these standards.(Final determination of major sourcestatus occurs as part of the compliancedetermination process undertaken byeach individual source.)

Impacts are presented relative to abaseline reflecting the level of control inthe absence of the rule. The current

level of control was well understood,because emissions and control datawere collected on each facility includedin the analysis. The impacts for existingsources were estimated by bringing eachfacility’s control level up to today’sstandards.

Impacts are not assessed for newsources because it was projected that nonew sources are expected to beginoperation through 1999. For moreinformation on this projection, see theNew Source Memo in the SID.

B. Primary Air Impacts

Today’s standards are estimated toreduce HAP emissions from all existingsources of listed elastomers by 6,400Mg/yr. This represents a 48 percentreduction from baseline. Table 4summarizes the HAP emissionreductions for each individualsubcategory.

C. Other Environmental Impacts

The total criteria air pollutantemissions resulting from process ventand wastewater control of today’sstandards are estimated to be around178 Mg/yr, with NOX emissions fromincinerators and boilers accounting foraround 155 Mg/yr. Minimal wastewateror solid and hazardous waste impactsare projected.

D. Energy Impacts

The total nationwide energy demandsthat would result from implementingthe process vent and wastewatercontrols are around 1.10 × 1012 Btuannually.

TABLE 4. HAP EMISSION REDUCTION BY SUBCATEGORY

Subcategory

HAP emission reduction (Mg/yr) Percentagereduction

from base-lineStorage

Front-endprocessvents

Back-endprocess op-

erations

Wastewateroperations

Equipmentleaks Total

Butyl rubber ............................................... 0 211 0 102 293 606 64Epichlorohydrin elastomer ......................... 4 0 0 0 120 124 77Ethylene propylene rubber ........................ 2 85 979 0 1,020 2,012 62Halobutyl rubber ........................................ 62 38 0 0 233 335 26HypalonTM ................................................. 0 0 0 0 0 0 0Neoprene ................................................... 0 258 0 0 96 354 48Nitrile butadiene latex ............................... 0 0 0 94 41 135 85Nitrile butadiene rubber ............................. 1 0 0 0 364 365 62Polybutadiene rubber/styrene butadiene

rubber by solution .................................. 0 0 882 0 637 1,519 44Polysulfide rubber ..................................... 0 0 0 0 0 0 0Styrene butadiene latex ............................ 0 22 0 272 332 627 44Styrene butadiene rubber by emulsion ..... 0 0 195 48 0 243 23Total—(percent of total reduction) ............ 69, (1) 615, (10) 2,056, (32) 516, (8) 3,136, (49) 6,392 48

E. Cost ImpactsCost impacts include the capital costs

of new control equipment, the cost ofenergy (supplemental fuel, steam, and

electricity) required to operate controlequipment, operation and maintenancecosts, and the cost savings generated byreducing the loss of valuable product in

the form of emissions. Also, costimpacts include the costs of monitoring,recordkeeping, and reporting associatedwith today’s standards. Average cost


effectiveness ($/Mg of pollutantremoved) is also presented as part ofcost impacts and is determined bydividing the annual cost by the annualemission reduction. Table 5 summarizesthe estimated capital and annual costsand average cost effectiveness bysubcategory.

Under the promulgated rule, it isestimated that total capital costs for

existing sources would be $26 million(1989 dollars), and total annual costswould by $18.4 million (1989 dollars)per year. It is expected that the actualcompliance cost impacts of the rulewould be less than presented because ofthe potential to use common controldevices, upgrade existing controldevices, use other less expensive controltechnologies, implement pollution

prevention technologies, or useemissions averaging. Because the effectof such practices is highly site-specificand data were unavailable to estimatehow often the lower cost compliancepractices could be utilized, it is notpossible to quantify the amount bywhich actual compliance costs would bereduced.

TABLE 5. SUMMARY OF REGULATORY COSTS

TCI a—(1000$)

TAC b—(1000$/yr)

AER c—(Mg/yr)

CE d—($/Mg)

Butyl .................................................................................................................................................... 691 1,316 606 2,200Epichlorohydrin ................................................................................................................................... 491 241 124 1,900Ethylene Propylene ............................................................................................................................ 5,854 3,506 2,012 1,700Halobutyl ............................................................................................................................................. 328 322 335 1,000Hypalon ............................................................................................................................................ 0 0 0 N/ANeoprene ............................................................................................................................................ 560 897 354 2,500Nitrile butadiene latex ......................................................................................................................... 465 243 135 1,800Nitrile butadiene rubber ...................................................................................................................... 397 444 365 1,200Polybutadine/styrene butadiene rubber by solution ........................................................................... 11,780 8,335 1,519 e 5,500Polysulfide .......................................................................................................................................... 0 0 0 N/AStyrene butadiene latex ...................................................................................................................... 1,480 1,028 627 1,600Styrene butadiene rubber by emulsion .............................................................................................. 3,942 2,112 243 e8,700

a ‘‘TCI’’ represents Total Capital Investment.b ‘‘TAC’’ represents Total Annualized Cost, including the monitoring, recordkeeping, and reporting cost.c ‘‘AER’’ represents the Annual Emission Reduction.d ‘‘CE’’ represents Cost-Effectiveness.e This cost-effectiveness is primarily due to the high costs estimated to control back-end process emissions to the MACT floor level. The costs

developed are costs for incineration devices to sufficient back-end vents so that emissions will be reduced to a level equivalent to the levelachieved by meeting the residual HAP limit by stripping. Extrapolation of industry estimates of the cost of enhanced stripping place the cost ofenhanced stripping as low as 10 percent of the cost of incineration.

F. Economic Impacts

Economic impacts for the regulatoryalternatives analyzed at proposal showthat the estimated price increases for theaffected chemicals range from 0.2percent for nitrile butadiene latex (NBL)to 2.5 percent for BR. Estimateddecreases in production range from 0.7percent for NBL to 5.0 percent for BR.With the reduced estimate in costs fromproposal, the economic impacts of thefinal rule should be lower than thoseestimated at proposal. No closures offacilities are expected as a result of thestandard.

Three aspects of the analysis arelikely to lead to an overestimate of theimpacts. First, the economic analysismodel assumes that all affected firmscompete in a national market, though inreality some firms may be protectedfrom competitors by regional or localtrade barriers. Second, facilities with thehighest control cost per unit ofproduction are assumed to also have thehighest baseline production costs perunit. This assumption may not alwaysbe true, because the baseline productioncosts per unit are not known, and thus,the estimated impacts, particularly forthe smaller firms, may be too high.Finally, economic impacts may beoverstated, because the alternative for

halobutyl rubber and butyl rubber thatwas used in this analysis is morestringent and more costly than theselected regulatory alternative.

For more information regarding theimpacts of the final standards, consultthe Basis and Purpose Document (seethe SUPPLEMENTARY INFORMATION sectionnear the beginning of the preamble).

IV. Significant Comments and Changesto the Proposed Standards

In response to comments received onthe proposed standards, changes havebeen made to the final standards. Whileseveral of these changes areclarifications designed to make theEPA’s intent clearer, a number of themare significant changes to therequirements of the proposed standards.A summary of the substantivecomments and/or changes made sincethe proposal are described in thefollowing sections. The rationale forthese changes and detailed responses topublic comments are included in theBasis and Purpose Document for thefinal standards. Additional informationis contained in the docket for these finalstandards (see ADDRESSES section of thispreamble).

National Emission Standards forHazardous Air Pollutant Emissions from

the Production of AcrylonitrileButadiene Styrene (ABS) Resin, StyreneAcrylonitrile (SAN) Resin, MethylMethacrylate Acrylonitrile ButadieneStyrene (MABS) Resin, MethylMethacrylate Butadiene Styrene (MBS)Resin, Polystyrene Resin, Poly(ethyleneterephthalate) (PET) Resin, and NitrileResin (Group IV Polymers and Resins)(40 CFR part 63, subpart JJJ), weredeveloped concurrently with subpart U.Many of the basic requirements of thetwo rules are alike, and in some casesthey are identical. Subpart V wasproposed on March 29, 1995, andcomments from the public werereceived. In many instances, similarcomments were received on analogoussections of subparts U and V. In theseinstances, the responses to commentsand appropriate rule changes werecoordinated. However, in someinstances, comments were received onsubpart V, and not on subpart U, thatwere applicable to provisions of subpartU. A summary of these comments canbe found in the ‘‘Hazardous AirPollutant Emissions from Process Unitsin the Thermoplastics ManufacturingIndustry—Basis and Purpose Documentfor Final Standards, Summary of PublicComments and Responses’’ (EPA–453/R–96–001b, May 1996; Docket Number


A–92–45, Item Number V–C–1). In a fewcases, the EPA decided that a change tosubpart U based on these comments wasappropriate. These changes did notresult in a change in the stringency ofthe subpart U provisions, but weretypically changes to improve the clarityof the rule. The one area where asubpart V comment resulted in atangible change to subpart U was in thebatch vent applicability determination;that is, an affected source is allowed todetermine the group status of a batchfront-end process vent based on itsprimary product.

A. Applicability Provisions andDefinitions

1. Designation of Affected Source andthe Definition of EPPU

Commenters expressed confusionabout the definitions of affected sourceand EPPU in the proposed rule. TheEPA reviewed both definitions andagreed the definitions neededclarification. Therefore, the EPA hasrevised the language describing affectedsource and EPPU in the final rule. Thedefinition of affected source has beenclarified, as discussed in section II andparagraph A.3 of this section.

The definition of EPPU was revisedand now includes a list of theequipment that comprises an EPPU.Because wastewater operations areancillary equipment and are often usedby more than one EPPU and may beused by more than one affected source,they are not included as part of theEPPU.

2. Definition of Organic HAP

Numerous commenters recommendedthat the EPA restrict the list of organicHAP in the final rule to those that areused or are present in significantquantities at EPPUs or those that arelisted in the HON, subpart F, table 2.The EPA agreed with the commentersthat a table providing a listing of thespecific organic HAP expected to beregulated for each subcategory coveredby the rule should be included in thefinal rule. Therefore, the definition oforganic HAP was revised to specifythose organic HAP known to be used orpresent in significant quantities for eachsubcategory. This list is provided intable 7 of the final rule.

This revised definition of organicHAP was developed using availableprocess description informationreceived from industry and gatheredfrom available literature. Because theremay be additional organic HAP presentat an affected source, the final rulerequires owners or operators to notifythe EPA of the presence of any

additional organic HAP based on thefollowing criteria: (1) Organic HAP isknowingly introduced into themanufacturing process, or has been orwill be reported under any Federal orState program, such as TRIS or Title V;and (2) Organic HAP is presented inTable 2 of subpart F.

3. Determining New Source StatusThe EPA received comments

regarding the process for determining ifnew or existing source requirementswould apply to a particular EPPU. Inresponse to those comments, the EPAhas revised the provisions in the finalstandards. Under the final standards,new affected sources are created undereach of the following four situations: (1)If a plant site with an existing affectedsource producing an elastomer productas its primary product constructs a newEPPU also producing the sameelastomer product as it primary product,the new EPPU is a new affected sourceif the new EPPU has the potential toemit more than 10 tons per year of asingle HAP, or 25 tons per year of allHAP; (2) when an EPPU is constructedat a major source plant site where theelastomer product was not previouslyproduced; (3) if a new EPPU isconstructed at a new plant site (i.e.,green field site) that will be a majorsource; and (4) when an existingaffected source undergoesreconstruction, thus making thepreviously existing source subject tonew source standards.

This approach to defining a newaffected source was selected in order tomake subpart U more consistent withthe HON. This standard differs from theHON, however, in that it applies tomultiple source categories. Thus, unlikethe HON, a newly added EPPU at afacility is covered by this rule even ifthat EPPU is in a different sourcecategory from the existing EPPUs at thefacility. It is the EPA’s position that theaddition of a process unit in a differentsource category is a new source andmust meet the requirements for newsources even though the EPPU may havethe potential to emit less than 10 tonsper year of a single HAP or 25 tons peryear of all HAP. Indeed, if a sourcecovered by another MACT standard (i.e.,a different source category) were built ata HON facility, that source would besubject to the new source requirementsunder that MACT standard.

4. Flexible Operation UnitsThe final rule has retained the HON

concept of flexible operation units, butthe language in the final rule has beensignificantly modified to moreadequately address polymer production

facilities. The final provisions requireflexible operation units with anelastomer as the primary product tocommit to complying with theelastomers rule at all times, regardless ofwhat product they are producing at anyparticular time. The primary product fora flexible operation unit is determinedbased on projected production for thenext 5 years.

B. Storage Vessel ProvisionsIn comments received on the storage

tank provisions, the EPA noted acommon misinterpretation of theproposed regulation related to thedistinction between a ‘‘storage vessel’’and a ‘‘surge control vessel’’. The EPAdetermined that many of the commentsreceived on ‘‘storage vessels’’ were infact referring to vessels that fall underthe definition of surge control vessel.The EPA suggests that owners andoperators of facilities subject to subpartU pay careful attention to thesedefinitions.

1. Applicability RequirementsSeveral comments were received

requesting that the EPA consider theexemption of vessels storing specificHAP or products. In fact, onecommenter indicated that the EPAshould conduct a full floor analysis fornew and existing storage vessels,considering each chemical separatelyand the various sizes of tanks for eachsubcategory. Other commenterssupported the exemption of strippedlatex storage tanks from controlrequirements, but also declared thathigh conversion SBR or polybutadienelatex storage tanks should also beexempt. Another commenter stated thattanks downstream of EPR strippingoperations should be exempt fromstorage vessel requirements, just asthose containing latex downstream ofstripping operations are exempt.

The EPA does not believe that thefloor analyses for each HAP stored atelastomer production facilities arerequired to be conducted under the Act,nor should they be conducted. The Actrequires the EPA to set emissionstandards for HAP on a source category(or subcategory) basis; it does notcompel the EPA to establish separatecontrol measures for each HAP emittedby a source in the category. Assuggested by the commenter, thisapproach could result in an incompletestandard, since it would not include astandard for a listed HAP that may beused in the future by elastomerfacilities. Further, consideration ofindividual HAP storage vessel controlswould not be representative of facility-wide storage vessel control levels.


However, the EPA believes that it isreasonable to exempt a storage vesselfrom the final regulation when it is clearthat the vessel would never be a Group1 storage vessel. The EPA determinedthat the following HAP used in theelastomer industry have low enoughvapor pressures that vessels storingthese HAP would never be Group 1:acrylamide, epichlorohydrin, andstyrene. Therefore, the final ruleexempts storage vessels containing theseHAP at existing sources. This exemptionis also extended to surge control vesselsand bottoms receivers at existingsources.

In addition, the EPA is convinced thatan SBL storage vessel (high conversionor otherwise) would never containsufficient HAP to exceed the vaporpressure cutoff for Group 1 storagevessels. This is primarily due to the lowvapor pressure of styrene. Therefore, thefinal rule exempts all SBL storagevessels, surge control vessels, andbottoms receivers from the requirementsof §§ 63.484 and 63.502.

Finally, the EPA agrees that storagevessels, surge control vessels, andbottoms receivers downstream ofstripping operations at ethylene-propylene rubber facilities that are incompliance with the provisions of§ 63.494 through the use of strippingtechnology should be exempt from thestorage vessel, surge control vessel, andbottoms receiver requirements. Further,the EPA believes that these exemptionsshould also extend to the othersubcategories required to comply withthe residual organic HAP limitations in§ 63.494(a)(1)–(3). However, since theresidual organic HAP content of rubberleaving the stripping operations atethylene propylene rubber andpolybutadiene/ styrene-butadienerubber by solution facilities complyingwith these provisions through the use ofadd-on control is not restricted, theseexemptions are not available to thesefacilities.

2. Emission LimitsCommenters requested that the

regulation allow the use of alternativestorage vessel/surge control vesselcontrol techniques. Two commentersdescribed specific control systemspresent at their facilities, and asked thatthe EPA include allowances for thesesystems in the rule. They stressed thatsuch allowances should consider theoverall effectiveness of the controlsystem, and not just the efficiency of thecontrol or recovery device.

The EPA agrees that it is reasonableto consider the overall effectiveness ofa control ‘‘system’’ in determiningcompliance with the rule, and that such

systems that have been demonstrated tobe equivalent to the reference controltechnology should be allowed. Whilethe EPA believes the system describedby the commenter could bedemonstrated to be equivalent to thereference control technology for surgecontrol vessels, the commenter did notprovide sufficient documentation toallow a complete evaluation ofequivalence.

However, the EPA maintains thatsubpart U, as proposed, alreadyprovides the opportunity for thecommenter, as well as other elastomerproduction facilities, to demonstrateequivalency of alternative controltechniques. For storage vessels, § 63.121of subpart G addresses the procedures toobtain approval of alternative means ofemission limitations. For surge controlvessels and bottoms receivers, theseprocedures are contained in § 63.177 ofsubpart H. In summary, these sectionsspecify that the owner or operator mustsubmit documentation of theequivalency determination to theAdministrator.

C. Continuous Front-end Process VentProvisions

1. Applicability Requirements

Several commenters stated that theexemption from halide controls forbutyl/halobutyl production should beextended to all rubber manufacturers,since halogen-containing compounds orby-products have historically beenrouted to flares. Another commenteragreed with the exemptions for butyland halobutyl production facilities, butpointed out that this exemption shouldonly be applicable to existing sources.

Only one existing facility wasidentified in each the halobutyl and thebutyl rubber subcategories. At both ofthese facilities, halogenated ventstreams were vented to a flare and/orboiler. Since both of these subcategorieswere single-facility subcategories, theMACT floor was determined to be theexisting level of control. The EPAexamined the impacts of requiringhalogenated vent streams at thehalobutyl and butyl rubber facilities tocomply with the proposed requirementsfor all other elastomer subcategories (i.e,the HON-level of control). The EPAconcluded that the costs associated withthis level of control were not reasonable,given the associated emission reduction.Therefore, the proposed regulationallowed halogenated streams athalobutyl and butyl rubber facilities thatwere routed to a flare or boiler prior toproposal to continue to be controlledwith these combustion devices, without

additional control for the resultinghalides.

Prior to proposal, the EPA was awareof one EPR facility that also routed ahalogenated vent stream to a boiler.However, since only one of five EPRfacilities reported this situation, theEPA concluded that this level of controlwas not the MACT floor for EPR. OtherEPR producers claimed that they alsohad halogenated streams at theirfacilities, but none offered anyinformation to quantify the amount ofhalogens in the stream to determine ifthe streams could be classified ashalogenated.

After proposal, the EPA learned thatchlorinated organic compounds arepresent in streams at all of the EPRfacilities. These compounds are a by-product of the polymerization reaction,resulting from a chlorinated catalyst. Atall four of the facilities contacted, thestreams containing the chlorinatedcompounds are routed to either a flareor boiler. Due to the widely varyingconcentration in the stream, all facilitiesindicated that it was difficult, if notimpossible, to accurately determine thehalogen atom concentration in the ventstream. However, all expressedconfidence that at times, the halidethreshold in the incoming stream wasexceeded.

Therefore, the EPA concluded thatfour of the five EPR facilities havehalogenated streams that are routed toeither a boiler or flare. For this reason,the EPA has determined that the floorfor EPR is the existing level of controlfor these halogenated vent streams. Inaddition, as with halobutyl and butylrubber, the EPA does not believe that itwould be cost-effective to require newincinerators and scrubbers to beinstalled at these facilities, when theonly net emission reduction would bethe reduction of the hydrochloric acid,since the reduction of the halogenatedorganic compound in the incineratorwould be the same as was already beingachieved in the boiler or flare. However,as noted above, sufficient stream-specific information was not available toconduct this analysis. Therefore, thefinal rule has been changed to extendthe exemption for existing halogenatedstreams routed to a boiler or flare to EPRproducers. Further, the final rulespecifies that this exemption does notapply to new sources.

2. Emission LimitsBased on a commenter’s request, the

final rule exempts a vent stream routedto an internal combustion engine asprimary fuel from source testingrequirements. The final rule alsorequires that the on/off status of internal


combustion be monitored as a means ofdemonstrating compliance with thesecontrol requirements.

D. Batch Front-End Process VentProvisions

Commenters believed that batch front-end process vent provisions wereinappropriate and unnecessarilyburdensome. Several commentersdisagreed with the EPA’s reliance on theBatch Processes ACT document in thedevelopment of the batch ventprovisions, claiming that it was notappropriate to the elastomermanufacturing industry.

The EPA believes that the potentialfor HAP emissions from batchoperations at elastomer productionfacilities warrant control. While the EPAdisagrees with the statement that theprovisions are inappropriate, the EPAagrees with comments regarding thecomplexity of the proposed batch ventprovisions. Therefore, in the final rulethese provisions were simplified. Manyof these changes are discussed below.

In response to comments on the batchfront-end process vent applicabilityprovisions, the volatility class concepthas been eliminated. The BatchProcesses ACT developed an annualthreshold emission level for each ofthree volatility classes. The EPAinitially judged that selection of a singleannual threshold emission level wouldnot be appropriate and included allthree levels in the proposed standards.However, upon further review, the EPAfound no adverse impact would resultfrom the use of a single annualthreshold emission level and, indeed,the final standards have beensignificantly simplified. Besidesremoving the requirement to determinethe volatility class, the final standardscontain only one equation fordetermining the cutoff flow rate(§ 63.488(f)) which is the last step in thegroup determination process.

A commenter on the proposedPolymers and Resins IV (40 CFR part 63,subpart V) regulation suggestedchanging the batch vent groupdetermination provisions to only utilizeemissions data from an EPPU’s primaryproduct. The EPA agreed that to basethe group determination on a singleproduct could, if appropriately applied,provide acceptable results from anenvironmental perspective, whilesimplifying the compliancerequirements for and improving theenforceability of the batch front-endprocess vent standards. Therefore, thefinal standards contain provisionsallowing the owner or operator of anaffected source to perform the groupdetermination for batch front-end

process vents based on annualizedproduction of a single batch product.However, the EPA does not consider itto be appropriate from an environmentalperspective to allow anything other thanthe worst-case HAP emitting batchproduct to be considered when basingapplicability on a single product.Therefore, the final standards specifythat the worst-case HAP emitting batchproduct be used when an owner oroperator chooses to annualize a singleproduct for purposes of determiningapplicability. The final standards definethe worst-case HAP emitting productand describe how emissions are to beannualized to represent full-timeproduction, where full-time productiondoes not necessarily mean operating atmaximum production rate. Since theproposed batch vent provisions weresimilar between subparts U and V, theEPA decided that this change was alsoappropriate for subpart U.

Several commenters stated that theproposed provisions for the methodsallowed for the calculation of batchfront-end process vent emissions wereoverly restrictive. The proposed rulerequired that emissions be calculatedusing either the emission estimationequations or source testing. If the owneror operator could demonstrate that boththe equations and source testing wereinappropriate, then they were allowedto use engineering assessment tocalculate HAP emissions. Thecommenters believed that an affectedsource should be allowed to useengineering assessments without havingto demonstrate that source testing wasinappropriate.

The EPA maintains that it isimperative that a consistent techniquefor the estimation of batch front-endprocess vent emissions be used, whichis provided through the emissionestimation equations. The EPA believesthe data required to use the batch front-end process vent emissions estimationequations should be obtainable withreasonable effort. The final standardscontinue to require use of the emissionsestimation equations, unless the owneror operator can demonstrate that theseequations are inappropriate.

However, the EPA has concluded thatdirect measurement of emissionsthrough testing may prove to be difficultand may or may not provide anincreased assurance of accuracy over theuse of engineering assessment.Therefore, if an owner or operator candemonstrate that the emissionsestimation equations are notappropriate, the final standards allowthe selection of either directmeasurement or engineeringassessment. Further, criteria for

demonstrating that the emissionsestimation equations are not appropriateto a specific batch emissions episodehave been added to the final standards.These criteria require either: (1) Theavailability of test data that demonstratea greater than 20 percent discrepancybetween the test value and the estimatedvalue, or (2) that the owner or operatordemonstrate to the Administrator thatthe emissions estimation equations arenot appropriate for a given batchemissions episode.

E. Back-End Process OperationProvisions

The back-end process operationprovisions received the majority of thecomments on the proposed rule.Significant comments were received onpractically every aspect of theseprovisions. Following is a summary ofthe comments that resulted in notablechanges to the back-end processoperation requirements.

1. Averaging PeriodSeveral commenters declared that

compliance based on a weekly averageHAP limitation was unreasonable, andthat compliance should bedemonstrated on the basis of a monthly(or 30-day) rolling average instead.These commenters claimed thatrequiring compliance based on a weeklyaverage fails to provide adequateoperational flexibility for manufacturersto produce different grades of polymersin accordance with customer demands.

Upon investigation of this issue, theEPA concluded that a monthlyaveraging period for the residual HAPlimitations was more appropriate.Changing to a monthly averaging periodwould provide more operationalflexibility to elastomer producers, whilemaintaining the same annual emissionreduction.

2. Residual Organic HAP LimitationsCommenters objected to numerous

aspects of the residual organic HAPlimitations. Most of these commentswere directed towards the methods usedto determine the back-end MACT floors.Discussed below are comments ondefinitions, test methods, and otherareas that affect the determination of theresidual organic HAP limitations. TheEPA addressed these comments and re-assessed the MACT floors.

Definition of crumb rubber dry weight.Comments stated that, for solutionprocesses, the definition of ‘‘crumbrubber dry weight’’ should not excludeextender oils and carbon black forcompliance purposes, because these arean integral part of the polymer. The EPAagrees with these comments, and has


revised the definition of crumb rubberdry weight to reflect this decision.

Residual organic HAP test methods.Concurrent with the proposal of subpartU, the EPA proposed three residual HAPtest methods—one each for SBRE, PBR/SBRS, and EPR. Several commentersstated that no single analytical methodwould produce consistent results for allpolymers, and consequently, eachcompany should be allowed todemonstrate compliance using acompany-specific method that iscomparable to the EPA test method.

After careful review andconsideration of this issue, the EPAagreed with the commenters and hasundergone an extensive effort to rectifythis situation. The EPA concluded thatit was appropriate to allow everyinterested company to validate theirown test method using a modifiedversion of 40 CFR part 63, appendix A,Method 301.

A total of nine test methods weresubmitted (three for EPR, three forSBRE, and three for PBR/SBRS). Themodified Method 301 analysisperformed allows each company tovalidate their own test method, andseven of the ten affected companieshave done so. Therefore, each sourcehas a compliance method available fordetermining residual HAP. The EPAbelieves that it would be helpful if theindustry had access to all validated testmethods, and is in the process ofreviewing the methods and validationdata that were submitted, and haspreliminarily indicated that approval ofall nine methods is anticipated. TheEPA intends to promulgate thesemethods as appendix A Methods 310 a,b, and c for EPR, Methods 312 a, b, andc for SBRE, and Methods 313 a, b, andc for PBR/SBRS. However, since theapproval and subsequent promulgationof the methods has not yet occurred,this final rule does not stipulate themethods to be used to determineresidual organic HAP. Uponpromulgation of these methods, theAgency will propose modifications tosubpart U to specify that these methodsbe used to determine residual organicHAP.

Furthermore, the affected industry hasbeen intimately involved with allactivity associated with the EPA’spromulgation of the residual organicHAP test methods. The EPA heldmeetings with industry representativesto discuss their comments on theproposed methods, and to discussprocedures for validating company testmethods. Every company that wasexpected to be subject to the back-endresidual organic HAP limitations wasinvited to these meetings. As noted

above, a total of nine test methods weresubmitted. These methods were fromseven companies, leaving only threeaffected companies that decided not tosubmit methods. Representatives ofeach of those three companies whichdid not submit test methods were inattendance at one or more of themeetings and are thereforeknowledgeable about the test methods.Since industry’s submittal of the testmethods, the EPA has worked closelywith industry representatives to finalizethe methods. Therefore, the EPAcontends that all affected companiesshould be well aware of the methodsthat will be promulgated.

As noted earlier, the final approval ofthese test methods is upcoming. It isanticipated that these methods will bepromulgated in the autumn of 1996. TheEPA does not believe that the intervalbetween the promulgation of subpart Uand the promulgation of these residualorganic HAP test methods impairs theability of any source to comply with therequirements by the specifiedcompliance date. This is the casebecause affected sources are notrequired to be in compliance until threeyears after promulgation of the rule.

MACT floor determination.Commenters indicated that the selectionof a MACT floor ‘‘somewhere betweenthe mean, median, and mode’’ did notrepresent central tendency. Theymaintained that a mean is the correctapproach for establishing the MACTfloor. The EPA agreed that one measureof central tendency should be used toestablish the average and decided thatthe mean was the most appropriatemeasure for the residual organic HAPlimitations floor determinations. Insome situations, the use of the mean canresult in a floor level of control that isnot represented by any available controltechnology. However, this did not applyto this situation, where the emissionsused to determine the floor were a resultof process-specific stripping techniques,and not specific add-on controltechnologies.

For EPR and PBR/SBRS, commentersstated that combining data receivedfrom different companies using differentsampling and analytical methods,without establishing whether themethods achieve comparable results,was not an appropriate way to establishresidual HAP limits. The commentersstated that if production figures anddryer stack testing results were used toestablish these limits, these resultscannot be equated to those from crumbsampling at the EPA’s designatedsampling point, because there arenumerous potential emission sourcesbetween the proposed sampling point

and the stack testing locations. Inaddition, commenters indicated that theproposed limitation did not recognizethe fact that residual HAP may remainin the polymer after finishing. Finally,the commenters also stated that usingannual emissions and limited weeklydata to establish weekly limits isinherently uncertain, and may haveresulted in an inappropriate standard.

In the original MACT floor analyses,the EPA presumed that the back-endemission factor calculated from thereported emissions and production wasequivalent to the residual HAP levels inthe crumb leaving the strippingoperations. Inherent in this analysis wasthe assumption that the companiesreported total HAP emissions from allback-end emission sources, rather thanonly a portion of these sources.

Upon receipt of these comments, theEPA again contacted each EPR and PBR/SBRS production facility to (1) verifythe emissions numbers used todetermine the back-end emission factor,(2) discuss the correlation of themethods used to estimate the originalemission estimates and the residualorganic HAP test methods undergoingvalidation, (3) determine theappropriate production, including oilextender weight, to use in determiningthe emission factor, (4) obtaininformation related to residual HAPremaining in the product after finishing,and (5) obtain short-term residual HAPinformation to be used in theadjustment of annual emissions tomonthly.

After obtaining this information, theEPA recalculated the MACT floors foreach subcategory. It should be notedthat only one facility indicated that theoriginal emission estimates werecalculated in a manner that wasinconsistent with the residual organicHAP test methods. Two PBR/SBRScompanies and one EPR companyprovided detailed short-term residualHAP data to allow the conversion of theannual data to a monthly limit. Theresulting monthly limits were 8 kg/Mgfor EPR and 10 kg/Mg for PBR/SBRS.

While no comments were receivedcriticizing the MACT floor analysis forSBRE, the change to a monthly averagelimit resulted in a change in the SBRElimit. In the determination of theoriginal SBRE back-end MACT floor,residual HAP data were used from threeof the four facilities. The fourth facilityprovided residual HAP data, but it wasin a monthly average format and couldnot be used in the determination of aweekly limit. However, the change to amonthly limit meant that the data fromthis facility could also be used, resultingin a monthly limit of 0.4 kg styrene per


Mg latex leaving the stripping operationfor existing SBRE sources.

3. Monitoring RequirementsSeveral comments were received

regarding the proposed crumb and latexsampling requirements. In bothinstances, the EPA decided that thechanges suggested by the commenterswere technically appropriate, and theydid not result in any detrimentalenvironmental impact.

Specifically, commenters found therequirement to sample ‘‘before anyopportunity for emissions to theatmosphere’’ to be either infeasible orunsafe for PBR/SBRS and EPR andsuggested modifications to the proposedsampling provisions. In response tothese comments, the final rule statesthat PBR/SBRS or EPR crumb samplesmust be taken ‘‘as soon as safe andfeasible after the stripping operation,but no later than the entry point for thefirst unit operation following thestripper (e.g., the dewatering screen).’’

For SBRE, commenters pointed outthat a more logical sampling location fordetermining the initial HAPconcentration in the SBL is the mixedlatex in the storage tank feeding thecoagulator (rather than directly after thestripper). The EPA agreed with thesecomments, and the final rule has revisedthe SBL sampling location to be ‘‘priorto any coagulation operations.’’

Comments were also receivedopposing the proposed crumb or latexsampling frequency provisions.Commenters believed that it isimpractical to take a rubber sample eachoperating day for every grade ofelastomer produced, because of the timerequired to reach representativeoperating conditions and to run anaccurate analytical test. Suggestedalternatives included one test per day,one test per ‘‘campaign,’’ daily samplingthat is reduced to weekly samplingupon demonstration of dailycompliance, and daily sampling withthe exception of grades produced forless than 4 hours in a day. Since thevariability of the residual HAP contentsbetween elastomer grades is relativelysmall, and since production schedulestypically produce very similar grades ofpolymer for extended periods of time,the EPA concluded that reducing thesampling frequency to once per day forcontinuous processes would greatlysimplify the rule, while still ensuringthat practically all grades of elastomerare represented by such sampling. Thischange is reflected in the final rule.

Some commenters were concernedthat compliance would be based on onesample per day, and requested that anowner or operator be allowed to sample

crumb or latex more frequently, andinclude the residual organic HAP resultsof these samples in the average. Whilethe EPA believes that the proposed ruledid not preclude a company from usingmore than one sample per day indetermining the (weekly) average, theEPA has revised the language in thefinal rule to make this opportunityclearer.

Several commenters stated that therule should provide an allowance formissed or invalid crumb or latexsamples. The proposed rule designatedthe failure to collect any single sampleas an excursion. These commenterssuggested that the EPA should require75 percent of samples to be collected.

The EPA recognizes that a number ofcircumstances could occur that cause asample not to be analyzed in accordancewith the rule. These may be in the formof sampling system malfunctions, mis-analysis, or other problems. The EPArealizes that there are unique challengesassociated with the sampling of solidpolymer, and agrees that problemscould occur that would cause a sampleto be missed. The EPA also recognizesthat some of the test methods beingvalidated to analyze the residual organicHAP in the crumb take long periods oftime to perform, meaning that theopportunity to obtain a second samplemay not be available if a mis-analysis inthe laboratory occurs. While the EPAexpects that sound company procedurescould eliminate most of these and otherproblems, the EPA agrees that it isunreasonable to expect that no problemswould ever occur that result in a missedsample. Therefore, an excursion forback-end process operations is definedin the final rule as when either (1) themonthly weighted average is above theapplicable limit, or (2) when less than75 percent of the required samples aretaken, analyzed, and included in themonthly average.

At proposal, the EPA specificallyrequested comments on the feasibility ofthe use of computer predictive modelingas an alternative to the daily crumb orlatex sampling, or the stripperparametric monitoring compliancealternatives. Numerous commenterssupported the allowance of suchsystems, while other expressedreservations. While the EPA believesthat computer predictive modeling maybe an attractive alternative to theperiodic sampling and stripperparametric monitoring complianceoptions, the EPA is convinced that theuse of computer predictive modeling isso site-specific that it is not possible toinclude general requirements for the useof such a system in subpart U.Nevertheless, the EPA believes that

facilities should have the opportunity toutilize techniques that are equivalent tothe two options of compliance providedin the proposed rule for facilities usingstripping technology. Therefore, theEPA has included a third option thatprovides the opportunity for the site-specific approval of alternative means ofcompliance through the submittal of analternative compliance plan.

F. Wastewater Operations ProvisionsSeveral commenters pointed out that

the wastewater provisions of subpart Gthat are referenced in § 63.501 ofsubpart U are the subject of litigationbrought by the Chemical Manufacturers’Association against the EPA.Consequently, sources subject to theseprovisions cannot know what the finalwastewater provisions, proposed to beincorporated into subpart U, will be.These commenters believed that theEPA should ‘‘reserve’’ the provisions of§ 63.501 pending the outcome of thelitigation.

As part of the HON litigationproposal, the EPA will requestcomments specific to the elastomersrule. If comments specific to theelastomers rule are received they will beaddressed as part of the HONrulemaking actions or in actions specificto the elastomers rule, depending on thecomments. Therefore, the commentperiod for this rule will not bereopened.

The EPA believes that the wastewaterprovisions and the other HONprovisions should be referenced in theelastomers rule so that final resolutionsof the HON litigation will beautomatically included in theelastomers rule. However, changes madeto the HON will be evaluated by theEPA for applicability to this rule. The‘‘automatic’’ part refers to the fact thattext changes will not need to be madeto this rule once the EPA, followingnotice and an opportunity for comment,finds the HON changes to be applicable.If the EPA determines that any changesto the HON are not applicable to thisrule, the elastomers rule will be revisedaccordingly.

Comments were received that theVOHAP threshold for regulation of newsource wastewater streams (10 ppmw)was too restrictive, and that the EPA hasnot provided an economic justificationregarding the achievability of the limit.Another comment was received statingthat many elastomer product processwastewater streams will have VOHAPconcentrations less than 50 ppmw, andmonitoring and recordkeepingrequirements are not needed for thesestreams. This comment recommendedthat the EPA exempt from regulation


‘‘any process stream at an affectedsource with an average flow rate of lessthan 0.02 liters per minute or an averageVOHAP concentration of less than 50ppmw.’’

The EPA evaluated the new sourceMACT floor determinations forwastewater, and determined that nofacility in any subcategory reportedwastewater controls equivalent to thenew source levels. In fact, no facility-wide wastewater controls greater thanthe existing source HON limitationswere reported. Therefore, the EPAbelieves that this comment is valid, andhas changed the final rule so that thenew sources are subject to the samewastewater requirements as existingsources.

In the proposed rule, the definition of‘‘wastewater’’ stated that a stream mustcontain at least 5 ppmw of VOHAP andhave a flow rate of 0.02 liter per minute.Given the change in the definition of aGroup 1 wastewater stream for newsources, the EPA believes that it isreasonable to revise the definition ofwastewater in accordance with thecommenter’s suggestion and thereforethe wastewater definition has beenrevised in the final rule.

G. Equipment Leak ProvisionsOne commenter requested that the

proposed rule include an exclusion forreciprocating pumps that must leaksmall quantities of product to lubricateand cool the shaft and seal areas. TheEPA agrees that an exemption for thesituation described by the commenter isreasonable. The EPA reached a similarconclusion in the proposed Polymersand Resins IV regulation (subpart V).Therefore, § 63.502(d) has been added tothe final rule that exempts thesereciprocating pump systems.

Several commenters stated that 3years should be allowed for compliancewith equipment leak provisions forcompressors (instead of 6 months)under certain circumstances. The EPAagrees with the commenters, and hasamended the compliance schedule forcompressors in the following situations:(1) Existing reciprocating compressorswhich would require designmodifications to connect to a closed-vent or recovery system; and (2) systemswhere existing compressors would bereplaced.

H. Emissions Averaging ProvisionsSeveral commenters requested that

batch front-end process vents be eligibleto average emissions. The EPA had notallowed emissions averaging of batchfront-end process vents at proposalbecause the EPA considered theaccuracy and consistency needed for

emissions averaging to be greater thanthat needed for applicabilitydeterminations. However, uponreconsideration, the EPA determinedthat the accuracy and consistency needsof emissions averaging could be met byapplying a ‘‘discount’’ factor (10percent) to calculated emissions or byrequiring direct measurement ofemissions. Therefore, the final ruleallows emissions averaging of existingbatch front-end process vents.

I. MonitoringMany commenters requested that the

proposed rule allow excused excursionsin the same way that the HON ruleallows excused excursions. In the finalrule, the EPA decided to excuse acertain number of excursions for eachreporting period. This decision wasbased on data and informationpresented during public comment onthe HON and reiterated in publiccomments received on this rule, andduring industry meetings heldsubsequent to proposal that indicatedthat a certain number of excursionscould be expected even with properlyoperated pollution control devices. TheEPA also concluded that not allowingexcused excursions would imposesignificant additional capital andoperating costs on the affected sourcefor only negligible correspondingreductions in air emissions. As isalways the case, a State has thediscretion to impose more stringentrequirements than the requirements ofNESHAP and other Federalrequirements and could choose not toallow the excused excursion provisionsof this rule.

The EPA considered the number ofexcused excursions that would be mostappropriate for this standard anddetermined that the number ofexcursions allowed in the HON wouldbe reasonable. Therefore, the finalprovisions allow a maximum of 6excused excursions for the firstsemiannual reporting period, decreasingby 1 excursion each semiannualreporting period. Starting with the sixthsemiannual reporting period (i.e., theend of the third year of compliance) andthereafter, affected sources are allowedone excused excursion per semiannualreporting period.

J. Recordkeeping and ReportingSeveral commenters stated that the

recordkeeping and reportingrequirements of the proposed rule wereextremely burdensome and requestedthat the EPA reduce the burden. TheEPA reexamined the recordkeeping andreporting requirements of the rule afterproposal and determined that burden

reductions were warranted. The EPAconsiders the recordkeeping andreporting requirements of the final rulethe minimum necessary to ensurecompliance with the final standards.The following changes were made toreduce the recordkeeping and reportingburden:

(1) The requirement to submit anInitial Notification has been eliminated;

(2) The requirement to submit anImplementation Plan has beeneliminated;

(3) The requirement to recordmonitored parameters every 15 minuteshas been removed. The final rulerequires hourly recording of monitoredparameters in place of the 15 minuterecords required in the proposed rule.

Although the above changes willreduce the burden on industry, the levelof this reduction was not quantified.

V. Administrative Requirements

A. DocketThe docket is an organized and

complete file of all the informationsubmitted to or otherwise considered bythe EPA in the development of the finalstandards. The principal purposes of thedocket are:

(1) To allow interested parties toreadily identify and locate documentsso that they can intelligently andeffectively participate in the rulemakingprocess; and

(2) To serve as the record in case ofjudicial review (except for interagencyreview materials as provided for insection 307(d)(7)(A)).

B. Executive Order 12866Under Executive Order 12866 (58 FR

5173 (October 4, 1993)), the EPA mustdetermine whether the regulatory actionis ‘‘significant’’ and therefore subject toOffice of Management and Budget(OMB) review and the requirements ofthe Executive Order. The ExecutiveOrder defines ‘‘significant regulatoryaction’’ as one that is likely to result instandards that may:

(1) Have an annual effect on theeconomy of $100 million or more oradversely affect, in a material way, theeconomy, a sector of the economy,productivity, competition, jobs, theenvironment, public health or safety, orState, local, or tribal governments orcommunities;

(2) Create a serious inconsistency orotherwise interfere with an action takenor planned by another agency;

(3) Materially alter the budgetaryimpact of entitlement, grants, user fees,or loan programs or the rights andobligations of recipients thereof; or

(4) Raise novel legal or policy issuesarising out of legal mandates, the


President’s priorities, or the principlesset forth in the Executive Order.

Pursuant to the terms of the ExecutiveOrder, the OMB has notified the EPAthat it considers this a ‘‘significantregulatory action’’ within the meaningof the Executive Order. The EPAsubmitted this action to the OMB forreview. Changes made in response tosuggestions or recommendations fromthe OMB were documented andincluded in the public record.

C. Paperwork Reduction Act

The information collectionrequirements for this NESHAP havebeen submitted for approval to theOffice of Management and Budget(OMB) under the Paperwork ReductionAct, 44 U.S.C. 3501 et seq. AnInformation Collection Request (ICR)document has been prepared by the EPA(ICR No. 1746.01), and a copy may beobtained from Sandy Farmer, OPPERegulatory Information Division (2137),U.S. Environmental Protection Agency,401 M Street, SW., Washington, DC20460, or by calling (202) 260–2740.

The public recordkeeping andreporting burden for this collection ofinformation is estimated to averageapproximately 587 hours perrespondent for each of the first 3 yearsfollowing promulgation of the rule.These estimates include time forreviewing instructions, searchingexisting data sources, gathering andmaintaining the data needed, andcompleting and reviewing the collectionof information.

Send comments regarding therecordkeeping and reporting burdenestimate or any other aspect of thiscollection of information, includingsuggestions for reducing this burden, toChief, Information Policy Branch (2137),U.S. Environmental Protection Agency,401 M Street, SW., Washington, DC20460; and to the Office of Informationand Regulatory Affairs, Office ofManagement and Budget, Washington,DC 20503, marked ‘‘Attention: DeskOfficer for EPA.’’

D. Regulatory Flexibility Act

The EPA has determined that it is notnecessary to prepare a regulatoryflexibility analysis in connection withthis final rule. The EPA has alsodetermined that this rule will not havea significant adverse economic impacton a substantial number of smallbusinesses. Consistent with SmallBusiness Administration (SBA) sizestandards, an elastomer producing firmis classified as a small entity if it hasless than 750 employees and isunaffiliated with a larger domestic

entity. Based upon this standard, threeof the eighteen elastomer producingfirms are classified as small entities (i.e.,having fewer than 750 employees). TheEPA determined that annual compliancecosts as a percentage of sales are lessthan one percent for all of the smallentities affected by this regulation. Thisdoes not qualify as a significanteconomic impact on a substantialnumber of small businesses.

E. Small Business RegulatoryEnforcement Fairness Act of 1996(SBREFA)

Pursuant to Subtitle E of SBREFA,this rule, which is nonmajor, wassubmitted to Congress beforepublication in the Federal Register.

F. Unfunded Mandates

Under section 202 of the UnfundedMandates Reform Act of 1995(‘‘Unfunded Mandates Act’’), signedinto law on March 22, 1995, the EPAmust prepare a budgetary impactstatement to accompany any proposedor final standards that include a Federalmandate that may result in estimatedcosts to State, local, or tribalgovernments, or to the private sector, of,in the aggregate, $100 million or more.Under section 205, the EPA must selectthe most cost effective and leastburdensome alternative that achievesthe objectives of the standard and isconsistent with statutory requirements.Section 203 requires the EPA toestablish a plan for informing andadvising any small governments thatmay be significantly or uniquelyimpacted by the standards.

The EPA has determined that the finalstandards do not include a Federalmandate that may result in estimatedcosts of, in the aggregate, $100 millionor more to either State, local, or tribalgovernments, or to the private sector,nor do the standards significantly oruniquely impact small governments,because they contain no requirementsthat apply to such governments orimpose obligations upon them.Therefore, the requirements of theUnfunded Mandates Act do not apply tothis final rule.

List of Subjects in 40 CFR Part 63

Environmental protection, Airpollution control, Hazardoussubstances, Reporting andrecordkeeping requirements.

Dated: July 15, 1996.Fred Hansen,Acting Administrator.

For the reasons set out in thepreamble, part 63 of title 40, chapter I

of the Code of Federal Regulations isamended as follows:

PART 63—NATIONAL EMISSIONSTANDARDS FOR HAZARDOUS AIRPOLLUTANTS FOR AFFECTEDSOURCE CATEGORIES

1. The authority citation for part 63continues to read as follows:

Authority: 42 U.S.C. 7401, et seq.

2. Part 63 is amended by addingsubpart U to read as follows:

Subpart U—National Emission Standardsfor Hazardous Air Pollutant Emissions:Group I Polymers and Resins

Sec.63.480 Applicability and designation of

affected sources.63.481 Compliance schedule and

relationship to existing applicable rules.63.482 Definitions.63.483 Emission standards.63.484 Storage vessel provisions.63.485 Continuous front-end process vent

provisions.63.486 Batch front-end process vent

provisions.63.487 Batch front-end process vents—

reference control technology.63.488 Methods and procedures for batch

front-end process vent groupdetermination.

63.489 Batch front-end process vents—monitoring requirements

63.490 Batch front-end process vents—performance test methods andprocedures to determine compliance.

63.491 Batch front-end process vents—recordkeeping requirements.

63.492 Batch front-end process vents—reporting requirements.

63.493 Standards for back-end processes.63.494 Back-end process provisions—

residual organic HAP limitations.63.495 Back-end process provisions—

procedures to determine complianceusing stripping technology.

63.496 Back-end process provisions—procedures to determine complianceusing control or recovery devices.

63.497 Back-end process provisions—monitoring provisions for control andrecovery devices.

63.498 Back-end process provisions—recordkeeping.

63.499 Back-end process provisions—reporting.

63.500 Back-end process provisions—carbon disulfide limitations for styrenebutadiene rubber by emulsion processes.

63.501 Wastewater provisions.63.502 Equipment leak provisions.63.503 Emissions averaging provisions.63.504 Additional test methods and

procedures.63.505 Parameter monitoring levels and

excursions.63.506 General recordkeeping and reporting

provisions.


Subpart U—National EmissionStandards for Hazardous Air PollutantEmissions: Group I Polymers andResins

§ 63.480 Applicability and designation ofaffected sources.

(a) Definition of affected source. Theprovisions of this subpart apply to eachaffected source. An affected source iseither an existing affected source or anew affected source. Existing affectedsource is defined in paragraph (a)(1) ofthis section, and new affected source isdefined in paragraph (a)(2) of thissection. The affected source alsoincludes all wastewater streams andwastewater operations associated withthe elastomer product process unit(s)(EPPUs) included in the affected source.

(1) Except as specified in paragraphs(b) through (d) of this section, anexisting affected source is defined aseach group of one or more EPPUs thatis not part of a new affected source, asdefined in paragraph (a)(2) of thissection, and that is manufacturing thesame primary product and located at aplant site that is a major source.

(2) Except as specified in paragraphs(b) through (d) of this section, a newaffected source is defined as a sourcemeeting the criteria of paragraph(a)(2)(i), (a)(2)(ii), or (a)(2)(iii) of thissection.

(i) At a plant site previously withoutHAP emission points, each group of oneor more EPPUs manufacturing the sameprimary product that is part of a majorsource on which constructioncommenced after June 12, 1995,

(ii) An EPPU meeting the criteria inparagraph (i)(1)(i) of this section, or

(iii) A reconstructed affected sourcemeeting the criteria in paragraph (i)(2)(i)of this section.

(b) EPPUs exempted from the affectedsource. EPPUs that do not use anyorganic HAP may be excluded from theaffected source, provided that the owneror operator complies with therequirements of paragraphs (b)(1) and(b)(2) of this section, if requested to doso by the Administrator.

(1) Retain information, data, andanalyses used to document the basis forthe determination that the EPPU doesnot use any organic HAP. Types ofinformation that could document thisdetermination include, but are notlimited to, records of chemicalspurchased for the process, analyses ofprocess stream composition, orengineering calculations.

(2) When requested by theAdministrator, demonstrate that theEPPU does not use any organic HAP.

(c) Emission points exempted fromthe affected source. The affected source

does not include the emission pointslisted in paragraphs (c)(1) through (c)(6)of this section:

(1) Stormwater from segregatedsewers;

(2) Water from fire-fighting anddeluge systems in segregated sewers;

(3) Spills;(4) Water from safety showers;(5) Vessels and equipment storing

and/or handling material that containsno organic HAP or organic HAP asimpurities only; and

(6) Equipment that is intended tooperate in organic HAP service for lessthan 300 hours during the calendar year.

(d) Processes exempted from theaffected source. The processes specifiedin paragraphs (d)(1) through (d)(3) ofthis section are not part of the affectedsource.

(1) Research and developmentfacilities;

(2) Equipment that is located withinan EPPU that is subject to this subpartbut does not contain organic HAP; and

(3) Solvent reclamation, recovery, orrecycling operations at hazardous wastetreatment, storage, and disposalfacilities (TSDF) requiring a permitunder 40 CFR part 270 that are separateentities and not part of an EPPU towhich this subpart applies.

(e) Applicability determination ofelastomer equipment included in aprocess unit producing a non-elastomerproduct. If an elastomer product that issubject to this subpart is producedwithin a process unit that is subject tosubpart V of this part, and at least 50percent of the elastomer is used in theproduction of the product manufacturedby the subpart V process unit, the unitoperations involved in the production ofthe elastomer are considered part of theprocess unit that is subject to subpart V,and not this subpart.

(f) Primary product determination andapplicability. The primary product of aprocess unit shall be determinedaccording to the procedures specified inparagraphs (f)(1) and (f)(2) of thissection. Paragraphs (f)(3) through (f)(4)of this section describe whether or nota process unit is subject to this subpart.Paragraphs (f)(5) through (f)(7) of thissection discuss compliance for thoseEPPUs operated as flexible operationunits, as specified in paragraph (f)(2) ofthis section.

(1) If a process unit only manufacturesone product, then that product shallrepresent the primary product of theprocess unit.

(2) If a process unit is designed andoperated as a flexible operation unit, theprimary product shall be determined asspecified in paragraphs (f)(2)(i) or(f)(2)(ii) of this section based on the

anticipated operations for the 5 yearsfollowing September 5, 1996 for existingaffected sources and for the first 5 yearsafter initial startup for new affectedsources.

(i) If the flexible operation unit willmanufacture one product for the greatestoperating time over the five-year period,then that product shall represent theprimary product of the flexibleoperation unit.

(ii) If the flexible operation unit willmanufacture multiple products equallybased on operating time, then theproduct with the greatest production ona mass basis over the five-year periodshall represent the primary product ofthe flexible operation unit.

(3) If the primary product of a processunit is an elastomer product, then thatprocess unit is considered an EPPU. Ifthat EPPU meets all the criteria ofparagraph (a) of this section, it is eitheran affected source or is part of anaffected source comprised of otherEPPU subject to this rule at the sameplant site with the same primaryproduct. The status of a process unit asan EPPU, and as an affected source orpart of an affected source shall notchange regardless of what products areproduced in the future by the EPPU,with the exception noted in paragraph(f)(3)(i) of this section.

(i) If a process unit terminates theproduction of all elastomer productsand does not anticipate the productionof any elastomer product in the future,the process unit is no longer an EPPUand is not subject to the provisions ofthis subpart after notification is made asspecified in paragraph (f)(3)(ii) of thissection.

(ii) The owner or operator of a processunit that wishes to remove the EPPUdesignation from the process unit, asspecified in paragraph (f)(3)(i) of thissection, shall notify the Administrator.This notification shall be accompaniedby rationale for why it is anticipatedthat no elastomer products will beproduced in the process unit in thefuture.

(iii) If a process unit meeting thecriteria of paragraph (f)(3)(i) of thissection begins the production of anelastomer product in the future, theowner or operator shall use theprocedures in paragraph (f)(4)(i) of thissection to determine if the process unitis re-designated as an EPPU.

(4) If the primary product of a processunit is not an elastomer product, thenthat process unit is not an affectedsource, nor is it part of any affectedsource subject to this rule. The processunit is not subject to this rule at anytime, regardless of what product is beingproduced. The status of the process unit


as not being an EPPU, and therefore notbeing an affected source or part of anaffected source subject to this subpart,shall not change regardless of whatproducts are produced in the future bythe EPPU, with the exception noted inparagraph (f)(4)(i) of this section.

(i) If, at any time beginning September5, 2001, the owner or operatordetermines that an elastomer product isthe primary product for the process unitbased on actual production data for anypreceding consecutive five-year period,then the process unit shall be classifiedas an EPPU. If an EPPU meets all thecriteria in paragraph (a) of this section,it is either an affected source or part ofan affected source and shall be subjectto this rule.

(ii) If a process unit meets the criteriaof paragraph (f)(4)(i) of this section, theowner or operator shall notify theAdministrator within 6 months ofmaking this determination. The EPPU,as the entire affected source or part ofan affected source, shall be incompliance with the provisions of thisrule within 3 years from the date of suchnotification.

(iii) If a process unit is re-designatedas an EPPU but does not meet all thecriteria of paragraph (a) of this section,the owner or operator shall notify theAdministrator within 6 months ofmaking this determination. Thisnotification shall includedocumentation justifying the EPPU’sstatus as not being an affected source ornot being part of an affected source.

(5) Once the primary product of aprocess unit has been determined to bean elastomer product and it has beendetermined that all the criteria ofparagraph (a) of this section are met forthe EPPU, the owner or operator of theaffected source shall comply with thestandards for the primary product.Owners or operators of flexibleoperation units shall comply with thestandards for the primary product asspecified in either paragraph (f)(5)(i) or(f)(5)(ii) of this section, except asspecified in paragraph (f)(5)(iii) of thissection.

(i) Each owner or operator shalldetermine the group status of eachemission point that is part of thatflexible operation unit based onemission point characteristics when theprimary product is being manufactured.Based on this finding, the owner oroperator shall comply with theapplicable standards for the primaryproduct for each emission point, asappropriate, at all times, regardless ofwhat product is being produced.

(ii) Alternatively, each owner oroperator shall determine the groupstatus of each emission point that is part

of the flexible operation unit based onthe emission point characteristics wheneach product produced by the flexibleoperation unit is manufactured,regardless of whether the product is anelastomer product or not. Based onthese findings, the owner or operatorshall comply with the applicablestandards, as appropriate, regardless ofwhat product is being produced.

Note: Under this scenario, it is possiblethat the group status, and therefore therequirement to achieve emission reductions,for an emission point may change dependingon the product being manufactured.]

(iii) Whenever a flexible operationunit manufactures a product that meetsthe criteria of paragraph (b) of thissection (i.e., does not use or produceany organic HAP), all activitiesassociated with the manufacture of theproduct, including the operation andmonitoring of control or recoverydevices, shall be exempt from therequirements of this rule.

(6) The determination of the primaryproduct for a process unit, to includethe determination of applicability of thissubpart to process units that aredesigned and operated as flexibleoperation units, shall be reported in theNotification of Compliance Statusrequired by § 63.506(e)(5) when theprimary product is determined to be anelastomer product. The Notification ofCompliance Status shall include theinformation specified in eitherparagraph (e)(6)(i) or (e)(6)(ii) of thissection. If the primary product isdetermined to be something other thanan elastomer product, the owner oroperator shall retain information, data,and analysis used to document the basisfor the determination that the primaryproduct is not an elastomer product.

(i) If the EPPU manufactures only oneelastomer product, identification of thatelastomer product.

(ii) If the EPPU is designed andoperated as a flexible operation unit, theinformation specified in paragraphs(f)(6)(ii)(A) through (f)(6)(ii)(C) of thissection, as appropriate.

(A) Identification of the primaryproduct.

(B) Information concerning operatingtime and/or production mass for eachproduct that was used to make thedetermination of the primary productunder paragraph (f)(2)(i) or (f)(2)(ii) ofthis section.

(C) Identification of whichcompliance option, either paragraph(f)(5)(i) or (f)(5)(ii) of this section, hasbeen selected by the owner or operator.

(7) To demonstrate compliance withthe rule during those periods when aflexible operation unit that is subject to

this subpart is producing a productother than an elastomer product or isproducing an elastomer product that isnot the primary product, the owner oroperator shall comply with eitherparagraphs (f)(7)(i) and (f)(7)(ii) orparagraph (f)(7)(iii) of this section.

(i) Establish parameter monitoringlevels as specified in § 63.505, for thoseemission points designated as Group 1,as appropriate.

(ii) Submit the parameter monitoringlevels developed under paragraph(f)(7)(i) of this section and the basis forthem in the Notification of ComplianceStatus report, as specified in§ 63.506(e)(5).

(iii) Demonstrate that the parametermonitoring levels established for theprimary product are also appropriate forthose periods when products other thanthe primary product are being produced.Material demonstrating this findingshall be submitted in the Notification ofCompliance Status report as specified in§ 63.506(e)(5).

(g) Storage vessel ownershipdetermination. The owner or operatorshall follow the procedures specified inparagraphs (g)(1) through (g)(8) of thissection to determine to which processunit a storage vessel shall belong.

(1) If a storage vessel is alreadysubject to another subpart of 40 CFRpart 63 on September 5, 1996, thatstorage vessel shall belong to theprocess unit subject to the other subpart.

(2) If a storage vessel is dedicated toa single process unit, the storage vesselshall belong to that process unit.

(3) If a storage vessel is shared amongprocess units, then the storage vesselshall belong to that process unit locatedon the same plant site as the storagevessel that has the greatest input into oroutput from the storage vessel (i.e., theprocess unit has the predominant use ofthe storage vessel).

(4) If predominant use cannot bedetermined for a storage vessel that isshared among process units and if onlyone of those process units is an EPPUsubject to this subpart, the storage vesselshall belong to that EPPU.

(5) If predominant use cannot bedetermined for a storage vessel that isshared among process units and if morethan one of the process units are EPPUsthat have different primary productsand that are subject to this subpart, thenthe owner or operator shall assign thestorage vessel to any one of the EPPUssharing the storage vessel.

(6) If the predominant use of a storagevessel varies from year to year, thenpredominant use shall be determinedbased on the utilization that occurredduring the year preceding September 5,1996 or based on the expected


utilization for the 5 years followingSeptember 5, 1996 for existing affectedsources, whichever is morerepresentative of the expectedoperations for that storage vessel, andbased on the expected utilization for the5 years after initial startup for newaffected sources. The determination ofpredominant use shall be reported inthe Notification of Compliance Statusrequired by § 63.506(e)(5)(vii). If thepredominant use changes, theredetermination of predominant useshall be reported in the next PeriodicReport.

(7) If the storage vessel beginsreceiving material from (or sendingmaterial to) another process unit; ceasesto receive material from (or sendmaterial to) a process unit; or if theapplicability of this subpart to a storagevessel has been determined according tothe provisions of paragraphs (g)(1)through (g)(6) of this section and thereis a significant change in the use of thestorage vessel that could reasonablychange the predominant use, the owneror operator shall reevaluate theapplicability of this subpart to thestorage vessel.

(8) Where a storage vessel is locatedat a major source that includes one ormore process units which place materialinto, or receive materials from thestorage vessel, but the storage vessel islocated in a tank farm, the applicabilityof this subpart shall be determinedaccording to the provisions inparagraphs (g)(8)(i) through (g)(8)(iv) ofthis section.

(i) The storage vessel may only beassigned to a process unit that utilizesthe storage vessel and does not have anintervening storage vessel for thatproduct (or raw materials, asappropriate). With respect to anyprocess unit, an intervening storagevessel means a storage vessel connectedby hard-piping to the process unit andto the storage vessel in the tank farm sothat product or raw material entering orleaving the process unit flows into (orfrom) the intervening storage vessel anddoes not flow directly into (or from) thestorage vessel in the tank farm.

(ii) If there is no process unit at themajor source that meets the criteria ofparagraph (g)(8)(i) of this section withrespect to a storage vessel, this subpartdoes not apply to the storage vessel.

(iii) If there is only one process unitat the major source that meets thecriteria of paragraph (g)(8)(i) of thissection with respect to a storage vessel,the storage vessel shall be assigned tothat process unit. Applicability of thissubpart to the storage vessel shall thenbe determined according to the

provisions of paragraph (a) of thissection.

(iv) If there are two or more processunits at the major source that meet thecriteria of paragraph (g)(8)(i) of thissection with respect to a storage vessel,the storage vessel shall be assigned toone of those process units according tothe provisions of paragraph (g)(6) of thissection. The predominant use shall bedetermined among only those processunits that meet the criteria of paragraph(g)(8)(i) of this section.

(h) Recovery operation equipmentownership determination. The owner oroperator shall follow the proceduresspecified in paragraphs (h)(1) through(h)(7) of this section to determine towhich process unit recovery operationequipment shall belong.

(1) If recovery operation equipment isalready subject to another subpart of 40CFR part 63 on September 5, 1996, thatrecovery operation equipment shallbelong to the process unit subject to theother subpart.

(2) If recovery operation equipment isused exclusively by a single processunit, the recovery operation shall belongto that process unit.

(3) If recovery operation equipment isshared among process units, then therecovery operation equipment shallbelong to that process unit located onthe same plant site as the recoveryoperation equipment that has thegreatest input into or output from therecovery operation equipment (i.e., thatprocess unit has the predominant use ofthe recovery operation equipment).

(4) If predominant use cannot bedetermined for recovery operationequipment that is shared among processunits and if one of those process unitsis an EPPU subject to this subpart, therecovery operation equipment shallbelong to the EPPU subject to thissubpart.

(5) If predominant use cannot bedetermined for recovery operationequipment that is shared among processunits and if more than one of theprocess units are EPPUs that havedifferent primary products and that aresubject to this subpart, then the owneror operator shall assign the recoveryoperation equipment to any one of thoseEPPUs.

(6) If the predominant use of recoveryoperation equipment varies from year toyear, then the predominant use shall bedetermined based on the utilization thatoccurred during the year precedingSeptember 5, 1996 or based on theexpected utilization for the 5 yearsfollowing September 5, 1996 for existingaffected sources, whichever is the morerepresentative of the expectedoperations for the recovery operations

equipment, and based on the expectedutilization for the first 5 years afterinitial startup for new affected sources.This determination shall be reported inthe Notification of Compliance Statusrequired by § 63.506(e)(5)(viii). If thepredominant use changes, theredetermination of predominant useshall be reported in the next PeriodicReport.

(7) If there is an unexpected change inthe utilization of recovery operationequipment that could reasonably changethe predominant use, the owner oroperator shall redetermine to whichprocess unit the recovery operationbelongs by reperforming the proceduresspecified in paragraphs (h)(2) through(h)(6) of this section.

(i) Changes or additions to plant sites.The provisions of paragraphs (i)(1)through (i)(4) of this section apply toowners or operators that change or addto their plant site or affected source.Paragraph (i)(5) provides examples ofwhat are and are not considered processchanges for purposes of paragraph (i) ofthis section.

(1) Adding an EPPU to a plant site.The provisions of paragraphs (i)(1)(i)through (i)(1)(ii) of this section apply toowners or operators that add EPPUs toa plant site.

(i) If an EPPU is added to a plant site,the addition shall be a new affectedsource and shall be subject to therequirements for a new affected sourcein this subpart upon initial startup or bySeptember 5, 1996, whichever is later, ifthe addition meets the criteria specifiedin paragraphs (i)(1)(i)(A) through(i)(1)(i)(B) and either (i)(1)(i)(C) or(i)(1)(i)(D) of this section:

(A) It is an addition that meets thedefinition of construction in § 63.2 ofsubpart A;

(B) Such construction commencedafter June 12, 1995; and

(C) The addition has the potential toemit 10 tons per year or more of anyHAP or 25 tons per year or more of anycombination of HAP, and the primaryproduct of the addition is currentlyproduced at the plant site as the primaryproduct of an affected source; or

(D) The primary product of theaddition is not currently produced atthe plant site as the primary product ofan affected source, and the plant sitemeets, or after the addition isconstructed will meet, the definition ofa major source in § 63.2 of subpart A.

(ii) If an EPPU is added to a plant site,the addition shall be subject to therequirements for an existing affectedsource in this subpart upon initialstartup or by 3 years after September 5,1996, whichever is later, if the additiondoes not meet the criteria specified in


paragraph (i)(1)(i) of this section and theplant site meets, or after the addition iscompleted will meet, the definition ofmajor source.

(2) Adding emission points or makingprocess changes to existing affectedsources. The provisions of paragraphs(i)(2)(i) through (i)(2)(ii) of this sectionapply to owners or operators that addemission points or make processchanges to an existing affected source.

(i) If any process change is made oremission point is added to an existingaffected source, or if a process changecreating one or more additional Group1 emission point(s) is made to anexisting affected source, the entireaffected source shall be a new affectedsource and shall be subject to therequirements for a new affected sourcein this subpart upon initial startup or bySeptember 5, 1996, whichever is later, ifthe process change or addition meetsthe criteria specified in paragraphs(i)(2)(i)(A) through (i)(2)(i)(B) of thissection:

(A) It is a process change or additionthat meets the definition ofreconstruction in § 63.2 of subpart A;and

(B) Such reconstruction commencedafter June 12, 1995.

(ii) If any process change is made oremission point is added to an existingaffected source, or if a process changecreating one or more additional Group1 emission point(s) is made to anexisting affected source and the processchange or addition does not meet thecriteria specified in paragraphs(i)(2)(i)(A) and (i)(2)(i)(B) of this section,the resulting emission point(s) shall besubject to the requirements for anexisting affected source in this subpart.The resulting emission point(s) shall bein compliance upon initial startup or by3 years after September 5, 1996,whichever is later, unless the owner oroperator demonstrates to theAdministrator that achievingcompliance will take longer thanmaking the process change or addition.If this demonstration is made to theAdministrator’s satisfaction, the owneror operator shall follow the proceduresin paragraphs (i)(2)(iii)(A) through(i)(2)(iii)(C) of this section to establish acompliance date.

(iii) To establish a compliance date foran emission point or points specified inparagraph (i)(2)(ii) of this section, theprocedures specified in paragraphs(i)(2)(iii)(A) through (i)(2)(iii)(C) of thissection shall be followed.

(A) The owner or operator shallsubmit to the Administrator forapproval a compliance schedule, alongwith a justification for the schedule.

(B) The compliance schedule shall besubmitted within 180 days after theprocess change or addition is made orthe information regarding the change oraddition is known to the owner oroperator, unless the complianceschedule has been previously submittedto the permitting authority. Thecompliance schedule may be submittedin the next Periodic Report if theprocess change or addition is made afterthe date the Notification of ComplianceStatus report is due.

(C) The Administrator shall approvethe compliance schedule or requestchanges within 120 calendar days ofreceipt of the compliance schedule andjustification.

(3) Existing source requirements forGroup 2 emission points that becomeGroup 1 emission points. If a processchange or addition that does not meetthe criteria in paragraph (i)(1) or (i)(2) ofthis section is made to an existing plantsite or existing affected source, and thechange causes a Group 2 emission pointto become a Group 1 emission point, forthat emission point the owner oroperator shall comply with therequirements of this subpart for existingGroup 1 emission points. Complianceshall be achieved as expeditiously aspracticable, but in no event later than 3years after the emission point becomesa Group 1 emission point.

(4) Existing source requirements forsome emission points that becomesubject to subpart H requirements. If asurge control vessel or bottoms receiverbecomes subject to § 63.170 of subpartH, or if a compressor becomes subject to§ 63.164 of subpart H, the owner oroperator shall be in compliance uponinitial startup or by 3 years afterSeptember 5, 1996, whichever is later,unless the owner or operatordemonstrates to the Administrator thatachieving compliance will take longerthan making the change. If thisdemonstration is made to theAdministrator’s satisfaction, the owneror operator shall follow the proceduresin paragraphs (i)(2)(iii)(A) through(i)(2)(iii)(C) of this section to establish acompliance date.

(5) Determining what are and are notprocess changes. For purposes ofparagraph (i) of this section, examples ofprocess changes include, but are notlimited to, changes in productioncapacity, feedstock type, or catalysttype, or whenever there is areplacement, removal, or addition ofrecovery equipment. For purposes ofparagraph (i) of this section, processchanges do not include: Process upsets,unintentional temporary processchanges, and changes that are within theequipment configuration and operating

conditions documented in theNotification of Compliance Status reportrequired by § 63.506(e)(5).

(j) Applicability of this subpart exceptduring periods of startup, shutdown,and malfunction. Each provision setforth in this subpart or referred to in thissubpart shall apply at all times exceptduring periods of startup, shutdown,and malfunction if the startup,shutdown, or malfunction precludes theability of a particular emission point atan affected source to comply with oneor more specific provisions to which itis subject.

§ 63.481 Compliance schedule andrelationship to existing applicable rules.

(a) Affected sources are required toachieve compliance on or before thedates specified in paragraphs (b)through (d) of this section. Paragraph (e)of this section provides information onrequesting compliance extensions.Paragraphs (f) through (i) of this sectiondiscuss the relationship of this subpartto subpart A and to other applicablerules. Where an override of anotherauthority of the Act is indicated in thissubpart, only compliance with theprovisions of this subpart is required.Paragraph (j) of this section specifies themeaning of time periods.

(b) New affected sources thatcommence construction orreconstruction after June 12, 1995 shallbe in compliance with this subpart uponinitial startup or September 5, 1996,whichever is later, as provided in§ 63.6(b) of subpart A.

(c) Existing affected sources shall bein compliance with this subpart (exceptfor § 63.502 for which compliance iscovered by paragraph (d) of this section)no later than 3 years after September 5,1996, as provided in § 63.6(c) of subpartA, unless an extension has been grantedas specified in paragraph (e) of thissection.

(d) Except as provided for inparagraphs (d)(1) through (d)(4) of thissection, existing affected sources shallbe in compliance with § 63.502 no laterthan March 5, 1997 unless a request fora compliance extension is grantedpursuant to section 112(i)(3)(B) of theAct, as discussed in § 63.182(a)(6) ofsubpart H.

(1) Compliance with the compressorprovisions of § 63.164 of subpart H shalloccur no later than September 5, 1997for any compressor meeting one or moreof the criteria in paragraphs (d)(1)(i)through (d)(1)(iii) of this section, if thework can be accomplished without aprocess unit shutdown, as defined in§ 63.161 of subpart H.

(i) The seal system will be replaced;


(ii) A barrier fluid system will beinstalled; or

(iii) A new barrier fluid will beutilized which requires changes to theexisting barrier fluid system.

(2) Compliance with the compressorprovisions of § 63.164 of subpart H shalloccur no later than March 5, 1998, forany compressor meeting all the criteriain paragraphs (d)(2)(i) through (d)(2)(iv)of this section.

(i) The compressor meets one or moreof the criteria specified in paragraphs(d)(1)(i) through (d)(1)(iii) of thissection;

(ii) The work can be accomplishedwithout a process unit shutdown asdefined in § 63.161 of subpart H;

(iii) The additional time is actuallynecessary, due to the unavailability ofparts beyond the control of the owner oroperator; and

(iv) The owner or operator submitsthe request for a compliance extensionto the U.S. Environmental ProtectionAgency (EPA) Regional Office at theaddresses listed in § 63.13 of subpart Ano later than 45 days before March 5,1997. The request for a complianceextension shall contain the informationspecified in § 63.6(i)(6)(i)(A), (B), and(D) of subpart A. Unless the EPARegional Office objects to the request fora compliance extension within 30calendar days after receipt of therequest, the request shall be deemedapproved.

(3) If compliance with the compressorprovisions of § 63.164 of subpart Hcannot reasonably be achieved withouta process unit shutdown, as defined in§ 63.161 of subpart H, the owner oroperator shall achieve compliance nolater than September 8, 1998. The owneror operator who elects to use thisprovision shall submit a request for anextension of compliance in accordancewith the requirements of paragraph(d)(2)(iv) of this section.

(4) Compliance with the compressorprovisions of § 63.164 of subpart H shalloccur not later than September 6, 1999for any compressor meeting one or moreof the criteria in paragraphs (d)(4)(i)through (d)(4)(iii) of this section. Theowner or operator who elects to usethese provisions shall submit a requestfor an extension of compliance inaccordance with the requirements ofparagraph (d)(2)(iv) of this section.

(i) Compliance cannot be achievedwithout replacing the compressor;

(ii) Compliance cannot be achievedwithout recasting the distance piece; or

(iii) Design modifications are requiredto connect to a closed-vent or recoverysystem.

(5) Compliance with the surge controlvessel and bottoms receiver provisions

of § 63.170 of subpart H shall occur nolater than September 6, 1999.

(e) Pursuant to section 112(i)(3)(B) ofthe Act, an owner or operator mayrequest an extension allowing theexisting source up to 1 additional yearto comply with section 112(d)standards. For purposes of this subpart,a request for an extension shall besubmitted to the operating permitauthority as part of the operating permitapplication or to the Administrator as aseparate submittal or as part of thePrecompliance Report. Requests forextensions shall be submitted no laterthan the date on which thePrecompliance Report is required to besubmitted in § 63.506(e)(3)(i). The datesspecified in § 63.6(i) of subpart A forsubmittal of requests for extensionsshall not apply to this subpart.

(1) A request for an extension ofcompliance shall include the datadescribed in § 63.6(i)(6)(i) (A), (B), and(D) of subpart A.

(2) The requirements in § 63.6(i)(8)through § 63.6(i)(14) of subpart A shallgovern the review and approval ofrequests for extensions of compliancewith this subpart.

(f) Table 1 of this subpart specifies theprovisions of subpart A that apply andthose that do not apply to owners andoperators of affected sources subject tothis subpart. For the purposes of thissubpart, Table 3 of subpart F is notapplicable.

(g) Table 2 of this subpart summarizesthe provisions of subparts F, G, and Hthat apply and those that do not applyto owners and operators of affectedsources subject to this subpart.

(h)(1) After the compliance datesspecified in this section, an affectedsource subject to this subpart that is alsosubject to the provisions of 40 CFR part63, subpart I, is required to comply onlywith the provisions of this subpart.

(2) Sources subject to 40 CFR part 63,subpart I that have elected to complythrough a quality improvementprogram, as specified in § 63.175 or§ 63.176 or both of subpart H, may electto continue these programs withoutinterruption as a means of complyingwith this subpart. In other words,becoming subject to this subpart doesnot restart or reset the ‘‘complianceclock’’ as it relates to reduced burdenearned through a quality improvementprogram.

(i) After the compliance datesspecified in this section, a storage vesselthat belongs to an affected sourcesubject to this subpart that is alsosubject to the provisions of 40 CFR part60, subpart Kb is required to complyonly with the provisions of this subpart.After the compliance dates specified in

paragraph (d) of this section, thatstorage vessel shall no longer be subjectto 40 CFR part 60, subpart Kb.

(j) All terms in this subpart that definea period of time for completion ofrequired tasks (e.g., monthly, quarterly,annual), unless specified otherwise inthe section or subsection that imposesthe requirement, refer to the standardcalendar periods.

(1) Notwithstanding time periodsspecified in this subpart for completionof required tasks, such time periods maybe changed by mutual agreementbetween the owner or operator and theAdministrator, as specified in subpart Aof this part (e.g., a period could beginon the compliance date or another date,rather than on the first day of thestandard calendar period). For each timeperiod that is changed by agreement, therevised period shall remain in effectuntil it is changed. A new request is notnecessary for each recurring period.

(2) Where the period specified forcompliance is a standard calendarperiod, if the initial compliance dateoccurs after the beginning of the period,compliance shall be required accordingto the schedule specified in paragraphs(j)(2)(i) or (j)(2)(ii) of this section, asappropriate.

(i) Compliance shall be requiredbefore the end of the standard calendarperiod within which the compliancedeadline occurs, if there remain at least2 weeks for tasks that must beperformed monthly, at least 1 month fortasks that must be performed eachquarter, or at least 3 months for tasksthat must be performed annually; or

(ii) In all other cases, complianceshall be required before the end of thefirst full standard calendar period afterthe period within which the initialcompliance deadline occurs.

(3) In all instances where a provisionof this subpart requires completion of atask during each multiple successiveperiod, an owner or operator mayperform the required task at any timeduring the specified period, providedthat the task is conducted at areasonable interval after completion ofthe task during the previous period.

§ 63.482 Definitions.(a) The following terms used in this

subpart shall have the meaning giventhem in subparts A (§ 63.2), F (§ 63.101),G (§ 63.111), and H (§ 63.161) asspecified after each term:Act (subpart A)Administrator (subpart A)Automated monitoring and recording

system (subpart G)Average concentration (subpart G)Boiler (subpart G)Bottoms receiver (subpart H)


By compound (subpart G)By-product (subpart F)Car-seal (subpart G)Chemical manufacturing process unit

(subpart F)Closed-vent system (subpart G)Co-product (subpart F)Combustion device (subpart G)Commenced (subpart A)Compliance date (subpart A)Compliance schedule (subpart A)Connector (subpart H)Construction (subpart A)Continuous monitoring system (subpart

A)Continuous record (subpart G)Continuous recorder (subpart G)Cover (subpart G)Distillation unit (subpart G)Emission standard (subpart A)Emissions averaging (subpart A)EPA (subpart A)Equipment (subpart H)Equipment leak (subpart F)Existing source (subpart A)External floating roof (subpart G)Fill (subpart G)Fixed roof (subpart G)Flame zone (subpart G)Flexible operation unit (subpart F)Floating roof (subpart G)Flow indicator (subpart G)Halogens and hydrogen halides (subpart

G)Hazardous air pollutant (subpart A)Heat exchange system (subpart F)Impurity (subpart F)Incinerator (subpart G)In organic hazardous air pollutant

service (subpart H)Instrumentation system (subpart H)Internal floating roof (subpart G)Lesser quantity (subpart A)Maintenance wastewater (subpart F)Major source (subpart A)Malfunction (subpart A)Mass flow rate (subpart G)Maximum true vapor pressure (subpart

G)New source (subpart A)Open-ended valve or line (subpart H)Operating permit (subpart F)Organic HAP service (subpart H)Organic monitoring device (subpart G)Owner or operator (subpart A)Performance evaluation (subpart A)Performance test (subpart A)Permitting authority (subpart A)Plant site (subpart F)Point of generation (subpart G)Potential to emit (subpart A)Primary fuel (subpart G)Process heater (subpart G)Process unit shutdown (subpart H)Process wastewater (subpart F)Process wastewater stream (subpart G)Product separator (subpart F)Reactor (subpart G)Reconstruction (subpart A)

Recovery device (subpart G)Reference control technology for process

vents (subpart G)Reference control technology for storage

vessels (subpart G)Reference control technology for

wastewater (subpart G)Relief valve (subpart G)Research and development facility

(subpart F)Residual (subpart G)Run (subpart A)Secondary fuel (subpart G)Sensor (subpart H)Shutdown (subpart A)Specific gravity monitoring device

(subpart G)Startup (subpart A)Startup, shutdown, and malfunction

plan (subpart F)State (subpart A)Surge control vessel (subpart H)Temperature monitoring device (subpart

G)Test method (subpart A)Total resource effectiveness index value

(subpart G)Treatment process (subpart G)Unit operation (subpart F)Vent stream (subpart G)Visible emission (subpart A)Waste management unit (subpart G)Wastewater (subpart F)Wastewater stream (subpart G)

(b) All other terms used in thissubpart shall have the meaning giventhem in this section. If a term is definedin a subpart referenced above and inthis section, it shall have the meaninggiven in this section for purposes of thissubpart.

Affected source is defined in§ 63.480(a).

Aggregate batch vent stream means agaseous emission stream containingonly the exhausts from two or morebatch front-end process vents that areducted together before being routed to acontrol device that is in continuousoperation.

Average flow rate, as used inconjunction with wastewaterprovisions, is defined in anddetermined by the specifications in§ 63.144(c) of subpart G; or, as used inconjunction with the batch front-endprocess vent provisions, is defined inand determined by the specifications in§ 63.488(e).

Back-end refers to the unit operationsin an EPPU following the strippingoperations. Back-end process operationsinclude, but are not limited to, filtering,coagulation, blending, concentration,drying, separating, and other finishingoperations, as well as latex and crumbstorage.

Batch cycle means the operationalstep or steps, from start to finish, thatoccur as part of a batch unit operation.

Batch cycle limitation means anenforceable restriction on the number ofbatch cycles that can be performed in ayear for an individual batch front-endprocess vent.

Batch emission episode means adiscrete emission venting episodeassociated with a single batch unitoperation. Multiple batch emissionepisodes may occur from a single batchunit operation.

Batch front-end process vent means apoint of emission from a batch unitoperation having a gaseous emissionstream with annual organic HAPemissions greater than 225 kilogramsper year and located in the front-end ofa process unit. Batch front-end processvents exclude relief valve dischargesand leaks from equipment regulatedunder § 63.502.

Batch process means a discontinuousprocess involving the bulk movement ofmaterial through sequentialmanufacturing steps. Mass, temperature,concentration, and other properties ofthe process vary with time. Addition ofraw material and withdrawal of productdo not typically occur simultaneously ina batch process. For the purposes of thissubpart, a process producing polymersis characterized as continuous or batchbased on the operation of thepolymerization reactors.

Batch unit operation means a unitoperation operated in a batch processmode.

Butyl rubber means a copolymer ofisobutylene and other monomers.Typical other monomers includeisoprene and methylstyrenes. A typicalcomposition of butyl rubber isapproximately 85 to 99 percentisobutylene and one to fifteen percentother monomers. Most butyl rubber isproduced by precipitationpolymerization, although other methodsmay be used.

Compounding unit means a unit ofoperation which blends, melts, andresolidifies solid polymers for thepurpose of incorporating additives,colorants, or stabilizers into the finalelastomer product. A unit operationwhose primary purpose is to removeresidual monomers from polymers is nota compounding unit.

Continuous front-end process ventmeans a point of emission from acontinuous process unit operationwithin an affected source having agaseous emission stream with a flowrate greater than or equal to 0.005standard cubic meter per minute andwith a total organic HAP concentrationgreater than or equal to 50 parts permillion by volume. Continuous front-end process vents exclude relief valve


discharges and leaks from equipmentregulated under § 63.502.

Continuous process means a processwhere the inputs and outputs flowcontinuously through sequentialmanufacturing steps throughout theduration of the process. Continuousprocesses typically approach steady-state conditions. Continuous processestypically involve the simultaneousaddition of raw material and withdrawalof product. For the purposes of thissubpart, a process producing polymersis characterized as continuous or batchbased on the operation of thepolymerization reactors.

Continuous unit operation means aunit operation operated in a continuousprocess mode.

Control device is defined in § 63.111of subpart G, except that the term‘‘process vent’’ shall be replaced withthe term ‘‘continuous front-end processvent’’ for the purpose of this subpart.

Crumb rubber dry weight means theweight of the polymer, minus the weightof water and residual organics.

Drawing unit means a unit operationwhich converts polymer into a differentshape by melting or mixing the polymerand then pulling it through an orifice tocreate a continuously extruded product.

Elastomer means any polymer havinga glass transition temperature lowerthan ¥10°C, or a glass transitiontemperature between ¥10°C and 25°Cthat is capable of undergoingdeformation (stretching) of severalhundred percent and recoveringessentially when the stress is removed.For the purposes of this subpart, resinsare not considered to be elastomers.

Elastomer product means one of thefollowing 12 types of products, as theyare defined in this section:

(1) Butyl Rubber,(2) Halobutyl Rubber,(3) Epichlorohydrin Elastomers,(4) Ethylene Propylene Rubber,(5) HypalonTM,(6) Neoprene,(7) Nitrile Butadiene Rubber,(8) Nitrile Butadiene Latex,(9) Polybutadiene Rubber/Styrene

Butadiene Rubber by Solution,(10) Polysulfide Rubber,(11) Styrene Butadiene Rubber by

Emulsion, and(12) Styrene Butadiene Latex.Elastomer product process unit

(EPPU) means a collection of equipmentassembled and connected by pipes orducts used to process raw materials andto manufacture an elastomer product asits primary product. This collection ofequipment includes process vents;storage vessels, as determined in§ 63.480(g); and the equipment (i.e.,pumps, compressors, agitators, pressure

relief devices, sampling connectionsystems, open-ended valves or lines,valves, connectors, instrumentationsystems, surge control vessels, andbottoms receivers that are associatedwith the elastomer product process unit)that are subject to the equipment leakprovisions as specified in § 63.502.Compounding units, spinning units,drawing units, extruding units, andother finishing steps are not part of anEPPU. In addition, a solid statepolymerization unit is not part of anEPPU.

Elastomer type means one of theelastomers defined under ‘‘elastomerproduct’’ in this section. Each elastomeridentified in that definition represents adifferent elastomer type.

Emission point means an individualcontinuous front-end process vent,batch front-end process vent, back-endprocess vent, storage vessel, wastewaterstream, or equipment leak.

Emulsion process means a processcarried out with the reactants in anemulsified form (e.g., polymerizationreaction).

Epichlorohydrin elastomer means anelastomer formed from thepolymerization or copolymerization ofepichlorohydrin (EPI). The mainepichlorohydrin elastomers arepolyepichlorohydrin, epi-ethylene oxide(EO) copolymer, epi-allyl glycidyl ether(AGE) copolymer, and epi-EO-AGEterpolymer. Epoxy resins produced bythe copolymerization of EPI andbisphenol A are not epichlorohydrinelastomers.

Ethylene-propylene rubber means anethylene-propylene copolymer or anethylene-propylene terpolymer.Ethylene-propylene copolymers (EPM)result from the polymerization ofethylene and propylene and contain asaturated chain of the polymethylenetype. Ethylene-propylene terpolymers(EPDM) are produced in a similarmanner as EPM, except that a moderateamount of the third monomer is addedto the reaction sequence. Typical thirdmonomers include ethylidenenorbornene, 1,4-hexadiene, ordicyclopentadiene. Ethylidenenorbornene is the most commonly used.The production process includes, but isnot limited to, polymerization, recycle,recovery, and packaging operations. Thepolymerization reaction may occur ineither a solution process or a suspensionprocess.

Extruding unit means a unit operationwhich converts polymer into a differentshape by melting or mixing the polymerand then forcing it through an orifice tocreate a continuously extruded product.

Front-end refers to the unit operationsin an EPPU prior to, and including, the

stripping operations. The process front-end includes all activity from rawmaterial storage through the strippingoperation, including pre-polymerizationblending, reactions, etc. For all gas-phased reaction processes, all unitoperations are considered to be front-end.

Gas-phased reaction process meansan elastomer production process wherethe reaction occurs in a gas phase,fluidized bed.

Grade means the subdivision of anelastomer product type by differentcharacteristics such as molecularweight, monomer composition,significant mooney values, and thepresence or absence of extender oil and/or carbon black.

Group 1 batch front-end process ventmeans a batch front-end process ventreleasing annual organic HAP emissionsgreater than or equal to 11,800 kg/yr andwith a cutoff flow rate, calculated inaccordance with § 63.488(f), greater thanor equal to the annual average flow rate.

Group 2 batch front-end process ventmeans a batch front-end process ventthat does not fall within the definitionof a Group 1 batch front-end processvent.

Group 1 continuous front-end processvent means a continuous front-endprocess vent releasing a gaseousemission stream that has a total resourceeffectiveness index value, calculatedaccording to § 63.115 of subpart G, lessthan or equal to 1.0.

Group 2 continuous front-end processvent means a continuous front-endprocess vent that does not fall withinthe definition of a Group 1 continuousfront-end process vent.

Group 1 storage vessel means astorage vessel at an existing affectedsource that meets the applicabilitycriteria specified in Table 3 of thissubpart, or a storage vessel at a newaffected source that meets theapplicability criteria specified in Table4 of this subpart.

Group 2 storage vessel means astorage vessel that does not fall withinthe definition of a Group 1 storagevessel.

Group 1 wastewater stream means aprocess wastewater stream from anelastomer product process unit at anexisting or new source with a totalvolatile organic hazardous air pollutantaverage concentration greater than orequal to 10,000 parts per million byweight of compounds listed in table 9 ofsubpart G at any flowrate; or a processwastewater stream from a process unitat an existing or new source that has anaverage flow rate greater than or equalto 10 liters per minute and a totalvolatile organic hazardous air pollutant


concentration greater than 1,000 partsper million by weight of compoundslisted in table 9 of subpart G.

Group 2 wastewater stream means anyprocess wastewater stream that does notmeet the definition of a Group 1wastewater stream.

Halobutyl rubber means a butylrubber elastomer produced usinghalogenated copolymers.

Halogenated aggregate batch ventstream means an aggregate batch ventstream determined to have a total massemission rate of halogen atomscontained in organic compounds of3,750 kg/yr or greater determined by theProcedures presented in § 63.488(h).

Halogenated batch front-end processvent means a batch front-end processvent determined to have a massemission rate of halogen atomscontained in organic compounds of3,750 kg/yr or greater determined by theprocedures presented in § 63.488(h).

Halogenated continuous front-endprocess vent means a continuous front-end process vent determined to have amass emission rate of halogen atomscontained in organic compounds of 0.45kg/hr or greater determined by theprocedures presented in§ 63.115(d)(2)(v) of subpart G.

High conversion latex means a latexwhere all monomers are reacted to atleast 95 percent conversion.

Hypalon TM means a chlorosulfonatedpolyethylene that is a synthetic rubberproduced for uses such as wire andcable insulation, shoe soles and heels,automotive components, and buildingproducts.

Latex means a colloidal aqueousemulsion of elastomer. A latex may befurther processed into finished productsby direct use as a coating or as a foam,or it may be precipitated to separate therubber particles, which are then used indry state to prepare finished products.

Latex weight includes the weight ofthe polymer and the weight of the watersolution.

Mass process means a process carriedout through the use of thermal energy(e.g., polymerization reaction). Massprocesses do not utilize emulsifying orsuspending agents, but can utilizecatalysts or other additives.

Material recovery section means theequipment that recovers unreacted orby-product materials from any processsection for return to the EPPU, off-sitepurification or treatment, or sale.Equipment designed to separateunreacted or by-product material fromthe polymer product is to be includedin this process section, provided that atthe time of initial compliance some ofthe material is recovered for reuse in theprocess, off-site purification or

treatment, or sale. Otherwise, suchequipment is to be assigned to one ofthe other process sections, asappropriate. If equipment is used torecover unreacted or by-productmaterial and return it directly to thesame piece of process equipment fromwhich it was emitted, then the recoveryequipment is considered to be part ofthe process section that contains theprocess equipment. On the other hand,if equipment is used to recoverunreacted or by-product material andreturn it to a different piece of processequipment in the same process section,the recovery equipment is considered tobe part of a material recovery section.Equipment that treats recoveredmaterials is to be included in thisprocess section, but equipment that alsotreats raw materials is not to beincluded in this process section. Thelatter equipment is to be included in theraw materials preparation section.

Month means either a calendar monthor a repeating 30-day period. For thepurposes of compliance with the back-end limitations in § 63.506, a month canbegin on any day of the month (i.e.,starting on the 15th and ending on the14th of the following month), as long asthe month never contains more than 31calendar days.

Neoprene means a polymer ofchloroprene (2-chloro-1,3-butadiene).The free radical emulsion process isgenerally used to produce neoprene,although other methods may be used.

Nitrile butadiene latex means apolymer consisting primarily ofunsaturated nitriles and dienes, usuallyacrylonitrile and 1,3-butadiene, that issold as a latex.

Nitrile butadiene rubber means apolymer consisting primarily ofunsaturated nitriles and dienes, usuallyacrylonitrile and 1,3-butadiene, notincluding those facilities that producenitrile butadiene latex.

Organic hazardous air pollutant(s)(organic HAP) means one or more of thechemicals listed in Table 5 of thissubpart or any other chemical which:

(1) Is knowingly introduced into themanufacturing process other than as animpurity, or has been or will be reportedunder any Federal or State program,such as EPCRA section 311, 312, or 313or Title V; and

(2) Is listed in Table 2 of subpart F ofthis part.

Polybutadiene rubber/styrenebutadiene rubber by solution means apolymer of 1,3-butadiene producedusing a solution process, and/or apolymer that consists primarily ofstyrene and butadiene monomer unitsand is produced using a solutionprocess.

Polymerization reaction sectionmeans the equipment designed to causemonomer(s) to react to form polymers,including equipment designed primarilyto cause the formation of short polymerchains (e.g., oligomers or low polymers),but not including equipment designedto prepare raw materials forpolymerization (e.g., esterificationvessels). For the purposes of thissubpart, the polymerization reactionsection begins with the equipment usedto transfer the materials from the rawmaterials preparation section and endswith the last vessel in whichpolymerization occurs.

Polysulfide rubber means a polymerproduced by reacting sodiumpolysulfide and chloroethyl formal.Polysulfide rubber may be produced aslatexes or solid product.

Primary product is defined in anddetermined by the procedures specifiedin § 63.480(f).

Process section means the equipmentdesigned to accomplish a general butwell-defined task in polymersproduction. Process sections includeraw materials preparation,polymerization reaction, and materialrecovery. A process section may bededicated to a single EPPU or may becommon to more than one EPPU.

Process unit means a collection ofequipment assembled and connected bypipes or ducts to process raw materialsand to manufacture a product.

Process vent means a point ofemission from a unit operation having agaseous emission stream. Typicalprocess vents include condenser vents,dryer vents, vacuum pumps, steamejectors, and atmospheric vents fromreactors and other process vessels, butdo not include pressure relief valves.

Product means a compound ormaterial which is manufactured by aprocess unit. By-products, isolatedintermediates, impurities, wastes, andtrace contaminants are not consideredproducts.

Raw materials preparation sectionmeans the equipment at a polymermanufacturing plant designed toprepare raw materials, such asmonomers and solvents, forpolymerization. For the purposes of thisstandard, this process section beginswith the equipment used to transfer rawmaterials from storage and/or theequipment used to transfer recoveredmaterial from the material recoveryprocess sections, and ends with the lastpiece of equipment that prepares thematerial for polymerization. The rawmaterials preparation section mayinclude equipment that is used topurify, dry, or otherwise treat rawmaterials or raw and recovered


materials together; to activate catalysts;and to promote esterification includingthe formation of some short polymerchains (oligomers). The raw materialspreparation section does not includeequipment that is designed primarily toaccomplish the formation of oligomers,the treatment of recovered materialsalone, or the storage of raw materials.

Recovery operations equipmentmeans the equipment used to separatethe components of process streams.Recovery operations equipmentincludes distillation units, condensers,etc. Equipment used for wastewatertreatment shall not be consideredrecovery operations equipment.

Resin means a polymer that is not anelastomer. The following arecharacteristics of resins and theproduction of resins:

(1) The polymer is a block polymer;(2) The manufactured polymer does

not require vulcanization to make usefulproducts;

(3) The polymer production process isoperated to achieve at least 99 percentmonomer conversion; and

(4) The polymer process unit does notrecycle unreacted monomer back to theprocess.

Solid state polymerization unit meansa unit operation which, through theapplication of heat, furthers thepolymerization (i.e., increases theintrinsic viscosity) of polymer chips.

Solution process means a processwhere both the monomers and theresulting polymers are dissolved in anorganic solvent.

Steady-state conditions means that allvariables (temperatures, pressures,volumes, flow rates, etc.) in a process donot vary significantly with time; minorfluctuations about constant mean valuescan occur.

Storage vessel means a tank or othervessel that is used to store liquids thatcontain one or more organic HAP andthat has been assigned, according to theprocedures in § 63.480(g), to an EPPUthat is subject to this subpart. Storagevessels do not include:

(1) Vessels permanently attached tomotor vehicles such as trucks, railcars,barges, or ships;

(2) Pressure vessels designed tooperate in excess of 204.9 kilopascalsand without emissions to theatmosphere;

(3) Vessels with capacities smallerthan 38 cubic meters;

(4) Vessels and equipment storingand/or handling material that containsno organic HAP, or organic HAP asimpurities only;

(5) Surge control vessels and bottomsreceiver tanks; and

(6) Wastewater storage tanks.

Stripping technology means theremoval of organic compounds from araw elastomer product by the use of heatand/or vacuum. Stripping technologyincludes steam stripping, directvolatilization, chemical stripping, andother methods of devolatilization.

Styrene butadiene latex means apolymer consisting primarily of styreneand butadiene monomer units producedusing an emulsion process and sold asa latex.

Styrene butadiene rubber by emulsionmeans a polymer consisting primarily ofstyrene and butadiene monomer unitsproduced using an emulsion process.Styrene butadiene rubber by emulsiondoes not include styrene butadienelatex.

Suspension process means a processcarried out with the reactants in a stateof suspension, typically achievedthrough the use of water and/orsuspending agents (e.g., polymerizationreaction).

Total organic compounds (TOC)means those compounds, excludingmethane and ethane, measuredaccording to the procedures of Method18 or Method 25A of 40 CFR part 60,appendix A.

Year means any consecutive 12-month period or 365 rolling days. Forthe purposes of emissions averaging, theterm year applies to any 12-monthperiod selected by the facility anddefined in its Emissions Averaging Plan.For the purposes of batch cyclelimitations, the term year applies to the12-month period defined by the facilityin its Notification of Compliance Status.

§ 63.483 Emission standards.(a) Except as allowed under

paragraphs (b) and (c) of this section,the owner or operator of an existing ornew affected source shall comply withthe provisions in:

(1) Section 63.484 for storage vessels;(2) Section 63.485 for continuous

front-end process vents;(3) Sections 63.486 through 63.492 for

batch front-end process vents;(4) Sections 63.493 through 63.500 for

back-end process operations;(5) Section 63.501 for wastewater;(6) Section 63.502 for equipment

leaks;(7) Section 63.504 for additional test

methods and procedures;(8) Section 63.505 for monitoring

levels and excursions; and(9) Section 63.506 for general

reporting and recordkeepingrequirements.

(b) Instead of complying with§§ 63.484, 63.485, 63.493, and 63.501,the owner or operator of an existingaffected source may elect to control any

or all of the storage vessels, continuousfront-end process vents, batch front-endprocess vents, aggregate batch ventstreams, and back-end processemissions within the affected source,plus any or all process wastewaterstreams associated with the affectedsource, to different levels using anemissions averaging complianceapproach that uses the proceduresspecified in § 63.503. An owner oroperator electing to use emissionsaveraging must still comply with theprovisions of §§ 63.484, 63.485, 63.486,63.493, and 63.501 for affected sourceemission points not included in theemissions average.

(c) A State may decide not to allowthe use of the emissions averagingcompliance approach specified inparagraph (b) of this section as acompliance option for an existingaffected source.

§ 63.484 Storage vessel provisions.(a) For each storage vessel located at

an affected source, except for thosestorage vessels exempted by paragraph(b) of this section, the owner or operatorshall comply with the requirements of§§ 63.119 through 63.123 and § 63.148of subpart G, with the differences notedin paragraphs (c) through (q) of thissection.

(b) Storage vessels described inparagraphs (b)(1) through (b)(7) of thissection are exempt from the storagevessel requirements of this section.

(1) Storage vessels containing styrene-butadiene latex;

(2) Storage vessels containing otherlatex products and located downstreamof the stripping operations;

(3) Storage vessels containing highconversion latex products;

(4) Storage vessels locateddownstream of the stripping operationsat affected sources subject to the back-end residual organic HAP limitationlocated in § 63.494, that are complyingthrough the use of stripping technology,as specified in § 63.495;

(5) Storage vessels containing styrene;(6) Storage vessels containing

acrylamide; and(7) Storage vessels containing

epichlorohydrin.(c) When the term ‘‘storage vessel’’ is

used in §§ 63.119 through 63.123 and63.148 of subpart G, the definition ofthis term in § 63.482 shall apply for thepurposes of this subpart.

(d) When the term ‘‘Group 1 storagevessel’’ is used in §§ 63.119 through63.123 and § 63.148 of subpart G, thedefinition of this term in § 63.482 shallapply for the purposes of this subpart.

(e) When the term ‘‘Group 2 storagevessel’’ is used in §§ 63.119 through


63.123 and § 63.148 of subpart G, thedefinition of this term in § 63.482 shallapply for the purposes of this subpart.

(f) When the emissions averagingprovisions of § 63.150 of subpart G arereferred to in § 63.119 and § 63.123 ofsubpart G, the emissions averagingprovisions contained in § 63.503 shallapply for the purposes of this subpart.

(g) When December 31, 1992 isreferred to in § 63.119 of subpart G, itshall be replaced with June 12, 1995 forthe purposes of this subpart.

(h) When April 22, 1994 is referred toin § 63.119 of subpart G, it shall bereplaced with September 5, 1996 for thepurposes of this subpart.

(i) Each owner or operator shallcomply with this paragraph instead of§ 63.120(d)(1)(ii) of subpart G for thepurposes of this subpart. If the controldevice used to comply with this sectionis also used to comply with §§ 63.485through § 63.501, the performance testrequired for these sections is acceptablefor demonstrating compliance with§ 63.119(e) of subpart G for the purposesof this subpart. The owner or operatorwill not be required to prepare a designevaluation for the control device asdescribed in § 63.120(d)(1)(i) of subpartG, if the performance test meets thecriteria specified in paragraphs (i)(1)and (i)(2) of this section.

(1) The performance test demonstratesthat the control device achieves greaterthan or equal to the required controlefficiency specified in § 63.119(e)(1) or§ 63.119(e)(2) of subpart G, asapplicable; and

(2) The performance test is submittedas part of the Notification of ComplianceStatus required by § 63.506(e)(5).

(j) When the term ‘‘operating range’’ isused in § 63.120(d)(3)(i) of subpart G, itshall be replaced with the term ‘‘level,’’for the purposes of this subpart. Thislevel shall be established using theprocedures specified in § 63.505.

(k) When the Notification ofCompliance Status requirementscontained in § 63.152(b) of subpart G arereferred to in §§ 63.120, 63.122, and63.123 of subpart G, the Notification ofCompliance Status requirementscontained in § 63.506(e)(5) shall applyfor the purposes of this subpart.

(l) When the Periodic Reportrequirements contained in § 63.152(c) ofsubpart G are referred to in §§ 63.120,63.122, and 63.123 of subpart G, thePeriodic Report requirements containedin § 63.506(e)(6) shall apply for thepurposes of this subpart.

(m) When other reports as required in§ 63.152(d) of subpart G are referred toin § 63.122 of subpart G, the reportingrequirements contained in § 63.506(e)(7)

shall apply for the purposes of thissubpart.

(n) When the Implementation Planrequirements contained in § 63.151(c) ofsubpart G are referred to in § 63.119through § 63.123 of subpart G, for thepurposes of this subpart the owner oroperator of an affected source need notcomply.

(o) When the Initial Notification Planrequirements contained in § 63.151(b) ofsubpart G are referred to in § 63.119through § 63.123 of subpart G, for thepurposes of this subpart the owner oroperator of an affected source need notcomply.

(p) When the determination ofequivalence criteria in § 63.102(b) ofsubpart F are referred to in § 63.121(a)of subpart G, the provisions in § 63.6(g)of subpart A shall apply for thepurposes of this subpart.

(q) The compliance date for storagevessels at affected sources subject to theprovisions of this section is specified in§ 63.481.

§ 63.485 Continuous front-end processvent provisions.

(a) For each continuous front-endprocess vent located at an affectedsource, the owner or operator shallcomply with the requirements of§§ 63.113 through 63.118 of subpart G,except as provided for in paragraphs (b)through (s) of this section. Continuousfront-end process vents that arecombined with one or more batch front-end process vents shall comply withparagraph (m) or (n) of this section.

(b) When the term ‘‘process vent’’ isused in §§ 63.113 through 63.118 ofsubpart G, it shall be replaced with theterm ‘‘continuous front-end processvent,’’ and the definition of this term in§ 63.482 shall apply for the purposes ofthis subpart.

(c) When the term ‘‘halogenatedprocess vent’’ is used in §§ 63.113through 63.118 of subpart G, it shall bereplaced with the term ‘‘halogenatedcontinuous front-end process vent,’’ andthe definition of this term in § 63.482shall apply for the purposes of thissubpart.

(d) When the term ‘‘Group 1 processvent’’ is used in §§ 63.113 through63.118 of subpart G, it shall be replacedwith the term ‘‘Group 1 continuousfront-end process vent,’’ and thedefinition of this term in § 63.482 shallapply for the purposes of this subpart.

(e) When the term ‘‘Group 2 processvent’’ is used in §§ 63.113 through63.118 of subpart G, it shall be replacedwith the term ‘‘Group 2 continuousfront-end process vent,’’ and thedefinition of this term in § 63.482 shallapply for the purposes of this subpart.

(f) When December 31, 1992 isreferred to in § 63.113 of subpart G, itshall be replaced with June 12, 1995 forthe purposes of this subpart.

(g) When §§ 63.151(f), alternativemonitoring parameters, and 63.152(e),submission of an operating permit, ofsubpart G are referred to in §§ 63.114(c)and 63.117(e) of subpart G, § 63.506(f),alternative monitoring parameters, and§ 63.506(e)(8), submission of anoperating permit, respectively, shallapply for the purposes of this subpart.

(h) When the Notification ofCompliance Status requirementscontained in § 63.152(b) of subpart G arereferred to in §§ 63.114, 63.117, and63.118 of subpart G, the Notification ofCompliance Status requirementscontained in § 63.506(e)(5) shall applyfor the purposes of this subpart.

(i) When the Periodic Reportrequirements contained in § 63.152(c) ofsubpart G are referred to in §§ 63.117and 63.118 of subpart G, the PeriodicReport requirements contained in§ 63.506(e)(6) shall apply for thepurposes of this subpart.

(j) When the definition of excursion in§ 63.152(c)(2)(ii)(A) of subpart G isreferred to in § 63.118(f)(2) of subpart G,the definition of excursion in § 63.505(g)and (h) shall apply for the purposes ofthis subpart.

(k) For the purposes of this subpart,owners and operators shall comply with§ 63.505, parameter monitoring levelsand excursions, instead of § 63.114(e) ofsubpart G. When the term ‘‘range’’ isused in § 63.117(f), § 63.118(a)(2)(iv),(b)(2)(iv), (f)(1), and (f)(6) of subpart G,it shall be replaced with the term‘‘level.’’ This level is determined inaccordance with § 63.505.

(l) When reports of process changesare required under § 63.118 (g), (h), (i),and (j) of subpart G, paragraphs (l)(1)through (l)(4) of this section shall applyfor the purposes of this subpart.

(1) Whenever a process change, asdefined in § 63.115(e) of subpart G, ismade that causes a Group 2 continuousfront-end process vent to become aGroup 1 continuous front-end processvent, the owner or operator shall submitthe following information in the firstperiodic report following the processchange, as specified in§ 63.506(e)(6)(iii)(D)(2):

(i) A description of the processchange; and

(ii) A schedule for compliance with§ 63.113(a) of subpart G, as requiredunder § 63.506(e)(6)(iii)(D)(2).

(2) Whenever a process change, asdefined in § 63.115(e) of subpart G, ismade that causes a Group 2 continuousfront-end process vent with a TREgreater than 4.0 to become a Group 2


continuous front-end process vent witha TRE less than 4.0, the owner oroperator shall submit the followinginformation in the first periodic reportfollowing the process change, asspecified in § 63.506(e)(6)(iii)(D)(2):


(ii) A schedule for compliance withthe provisions of § 63.113(d) of subpartG, as required under§ 63.506(e)(6)(iii)(D)(2).

(3) Whenever a process change, asdefined in § 63.115(e) of subpart G, ismade that causes a Group 2 continuousfront-end process vent with a flow rateless than 0.005 standard cubic meter perminute (scmm) to become a Group 2continuous front-end process vent witha flow rate of 0.005 scmm or greater anda TRE index value less than or equal to4.0, the owner or operator shall submitthe following information in the firstperiodic report following the processchange, as specified in§ 63.506(e)(6)(iii)(D)(2):


(ii) A schedule for compliance withtwo provisions of § 63.113(d) of subpartG, as required under§ 63.506(e)(6)(iii)(D)(2).

(4) Whenever a process change, asdefined in § 63.115(e) of subpart G, ismade that causes a Group 2 continuousfront-end process vent with an organicHAP concentration less than 50 partsper million by volume (ppmv) tobecome a Group 2 continuous front-endprocess vent with an organic HAPconcentration of 50 ppmv or greater anda TRE index value less than or equal to4.0, the owner or operator shall submitthe following information in the firstperiodic report following the processchange, as specified in§ 63.506(e)(6)(iii)(D)(2):


(ii) A schedule for compliance withthe provisions of § 63.113(d) of subpartG, as required under§ 63.506(e)(6)(iii)(D)(2).

(m) If a batch front-end process ventis combined with a continuous front-end process vent prior to being routedto a control device, the combined ventstream shall comply with eitherparagraph (m)(1) or (m)(2) of thissection, as appropriate.

(1) If the continuous front-end processvent is a Group 1 continuous front-endprocess vent, the combined vent streamshall comply with all requirements fora Group 1 continuous process ventstream in §§ 63.113 through 63.118 ofsubpart G, with the differences noted inparagraphs (b) through (l) of thissection.

(2) If the continuous front-end processvent is a Group 2 continuous front-endprocess vent, the TRE index value shallbe calculated during maximumrepresentative operating conditions. Forcombined streams containingcontinuous front-end and batch front-end process vents, the maximumrepresentative operating conditionsshall be during periods when batchemission episodes are venting to thecontrol device resulting in the highestconcentration of organic HAP in thecombined vent stream.

(n) If a batch front-end process vent iscombined with a continuous front-endprocess vent prior to being routed to arecovery device, the TRE index valueshall be calculated at the exit of therecovery device at maximumrepresentative operating conditions. Forcombined vent streams containingcontinuous front-end and batch front-end process vents, the maximumrepresentative operating conditionsshall be during periods when batchemission episodes are venting to therecovery device resulting in the highestconcentration of organic HAP in thecombined vent stream.

(o) Group 1 halogenated continuousfront-end process vents at affectedexisting sources producing butyl rubber,halobutyl rubber, or ethylene propylenerubber are exempt from therequirements to control hydrogenhalides and halogens from the outlet ofcombustion devices contained in§ 63.113(c) of subpart G, if theconditions in paragraphs (o)(1) and(o)(2) of this section are met. Affectednew sources are not exempt from theseprovisions.

(1)(i) For affected sources producingbutyl rubber, halobutyl rubber, orethylene propylene rubber using asolution process, if the halogenatedcontinuous front-end process ventstream was controlled by a combustiondevice prior to June 12, 1995, or

(ii) For affected sources producingethylene propylene rubber using a gas-phased reaction process, if thehalogenated continuous front-endprocess vent stream was controlled by acombustion device since startup.

(2) The combustion device meets therequirements of § 63.113(a)(1)(i),§ 63.113(a)(2), § 63.113(a)(3), or§ 63.113(b) of subpart G.

(p) The compliance date forcontinuous front-end process ventssubject to the provisions of this sectionis specified in § 63.481. This replacesthe reference to § 63.100 of subpart F in§ 63.115(e)(2) of subpart G.

(q) Internal combustion engines. Inaddition to the three options for thecontrol of a Group 1 continuous front-

end process vent listed in § 63.113(a)(1)–(3) of subpart G, an owner oroperator can route emissions of organicHAP to an internal combustion engine,provided the conditions listed inparagraphs (q)(1) through (q)(3) of thissection are met.

(1) The vent stream routed to theinternal combustion engine shall not bea halogenated continuous front-endprocess vent stream.

(2) The organic HAP is introducedwith the primary fuel.

(3) The owner or operatorcontinuously monitors the on/off statusof the internal combustion engine.

(4) If an internal combustion enginemeeting the requirements of paragraphs(q) (1) through (3) of this section is usedto comply with the provisions of§ 63.113(a) of subpart G, the internalcombustion engine is exempt from thesource testing requirements of § 63.116of subpart G.

(r) When the provisions of § 63.116(c)(3) and (c)(4) of subpart G specify thatMethod 18 shall be used, Method 18 orMethod 25A may be used for thepurposes of this subpart. The use ofMethod 25A shall comply withparagraphs (r)(1) and (r)(2) of thissection.

(1) The organic HAP used as thecalibration gas for Method 25A shall bethe single organic HAP representing thelargest percent by volume of theemissions.

(2) The use of Method 25A isacceptable if the response from the high-level calibration gas is at least 20 timesthe standard deviation of the responsefrom the zero calibration gas when theinstrument is zeroed on the mostsensitive scale.

(s) When the provisions of § 63.116(b)identify conditions under which aperformance test is not required, forpurposes of this subpart, the exemptionin paragraph (s)(1) of this section shallalso apply. Further, if a performance testmeeting the conditions specified inparagraph (s)(2) of this section has beenconducted by the owner or operator, theresults of that performance test shallsuffice, for the purposes of this section.

(1) An incinerator burning hazardouswaste for which the owner or operatorcomplies with the requirements of 40CFR part 264, subpart O.

(2) Performance tests done for othersubparts in part 60 or part 63 wheretotal organic HAP or TOC wasmeasured, provided that the owner oroperator can demonstrate that operatingconditions for the process and control orrecovery device during the performancetest are representative of currentoperating conditions.


§ 63.486 Batch front-end process ventprovisions.

(a) Batch front-end process vents.Except as specified in paragraph (b) ofthis section, owners and operators ofnew and existing affected sources withbatch front-end process vents shallcomply with the requirements in§§ 63.487 through 63.492. The batchfront-end process vent group status shallbe determined in accordance with§ 63.488. Batch front-end process ventsclassified as Group 1 shall comply withthe reference control technologyrequirements for Group 1 batch front-end process vents in § 63.487, themonitoring requirements in § 63.489,the performance test methods andprocedures to determine compliancerequirements in § 63.490, therecordkeeping requirements in § 63.491,and the reporting requirements in§ 63.492. All Group 2 batch front-endprocess vents shall comply with theapplicable reference control technologyrequirements in § 63.487, therecordkeeping requirements in § 63.491,and the reporting requirements in§ 63.492.

(b) Aggregate batch vent streams.Aggregate batch vent streams, as definedin § 63.482, are subject to the controlrequirements for individual batch front-end process vents, as specified in§ 63.487(b), as well as the monitoring,testing, recordkeeping, and reportingrequirements specified in § 63.489through § 63.492.

§ 63.487 Batch front-end process vents—reference control technology.

(a) Batch front-end process vents. Theowner or operator of a Group 1 batchfront-end process vent, as determinedusing the procedures in § 63.488, shallcomply with the requirements of eitherparagraph (a)(1) or (a)(2) of this section.Compliance can be based on eitherorganic HAP or TOC.

(1) For each batch front-end processvent, reduce organic HAP emissionsusing a flare.

(i) The flare shall comply with therequirements of § 63.11(b) of subpart A.

(ii) Halogenated batch front-endprocess vents, as defined in § 63.482,shall not be vented to a flare.

(2) For each batch front-end processvent, reduce organic HAP emissions forthe batch cycle by 90 weight percentusing a control device. Owners oroperators may achieve compliance withthis paragraph through the control ofselected batch emission episodes or thecontrol of portions of selected batchemission episodes. Documentationdemonstrating how the 90 weightpercent emission reduction is achievedis required by § 63.490(c)(2).

(b) Aggregate batch vent streams. Theowner or operator of an aggregate batchvent stream that contains one or moreGroup 1 batch front-end process ventsshall comply with the requirements ofeither paragraph (b)(1) or (b)(2) of thissection. Compliance can be based oneither organic HAP or TOC.

(1) For each aggregate batch ventstream, reduce organic HAP emissionsusing a flare.

(i) The flare shall comply with therequirements of § 63.11(b) of subpart A.

(ii) Halogenated aggregate batch ventstreams, as defined in § 63.482, shall notbe vented to a flare.

(2) For each aggregate batch ventstream, reduce organic HAP emissionsby 90 weight percent on a continuousbasis using a control device.

(c) Halogenated emissions.Halogenated Group 1 batch front-endprocess vents, halogenated aggregatebatch vent streams, and halogenatedcontinuous front-end process vents thatare combusted as part of complyingwith paragraph (a)(2) or (b)(2) of thissection, shall be controlled according toeither paragraph (c)(1) or (c)(2) of thissection.

(1) If a combustion device is used tocomply with paragraph (a)(2) or (b)(2) ofthis section for a halogenated batchfront-end process vent or halogenatedaggregate batch vent stream, theemissions shall be ducted from thecombustion device to an additionalcontrol device that reduces overallemissions of hydrogen halides andhalogens by 99 percent before thoseemissions are discharged to theatmosphere.

(2) A control device may be used toreduce the halogen atom mass emissionrate to less than 3,750 kg/yr for batchfront-end process vents or aggregatebatch vent streams and thus make thebatch front-end process vent oraggregate batch vent streamnonhalogenated. The nonhalogenatedbatch front-end process vent oraggregate batch vent stream must thencomply with the requirements of eitherparagraph (a) or (b) of this section, asappropriate.

(d) If a boiler or process heater is usedto comply with the percent reductionrequirement specified in paragraph(a)(2) or (b)(2) of this section, the batchfront-end process vent or aggregatebatch vent stream shall be introducedinto the flame zone of such a device.

(e) Combination of batch front-endprocess vents or aggregate batch ventstreams with continuous front-endprocess vents. A batch front-end processvent or aggregate batch vent streamcombined with a continuous front-endprocess vent stream is not subject to the

provisions of §§ 63.488 through 63.492,providing the requirements ofparagraphs (e)(1), (e)(2), and either (e)(3)or (e)(4) of this section are met.

(1) The batch front-end process ventis combined with a continuous front-end process vent prior to routing thecontinuous front-end process vent to acontrol or recovery device. In thisparagraph, the definitions of controldevice and recovery device as theyrelate to continuous front-end processvents shall be used.

(2) The only emissions to theatmosphere from the batch front-endprocess vent or aggregate batch ventstream prior to being combined with thecontinuous front-end process vent arefrom equipment subject to and incompliance with § 63.502.

(3) If the batch front-end vent streamor aggregate batch vent stream iscombined with a continuous front-endprocess vent stream prior to beingrouted to a control device, the combinedvent stream shall comply with therequirements in § 63.485(m). In thisparagraph, the definition of controldevice as it relates to continuous front-end process vents shall be used.

(4) If the batch front-end process ventor aggregate batch vent stream iscombined with a continuous front-endprocess vent stream prior to beingrouted to a recovery device, thecombined vent stream shall complywith the requirements in § 63.485(n). Inthis paragraph, the definition ofrecovery device as it relates tocontinuous front-end process vents shallbe used.

(f) Group 2 batch front-end processvents with annual emissions greaterthan or equal to the level specified in§ 63.488(d). The owner or operator of aGroup 2 batch front-end process ventwith annual emissions greater than orequal to the level specified in§ 63.488(d) shall comply with theprovisions of paragraphs (f)(1) and (f)(2)of this section.

(1) Establish a batch cycle limitationthat ensures that the Group 2 batchfront-end process vent does not becomea Group 1 batch front-end process vent,and

(2) Comply with the recordkeepingrequirements in § 63.491(d)(2), and thereporting requirements in § 63.492(a)(3)and (b).

(g) Group 2 batch front-end processvents with annual emissions less thanthe level specified in § 63.488(d). Theowner or operator of a Group 2 batchfront-end process vent with annualorganic HAP emissions less than thelevel specified in § 63.488(d), shallcomply with either paragraphs (g)(1)and (g)(2) of this section or with


paragraphs (f)(1) and (f)(2) of thissection.

(1) Establish a batch cycle limitationthat ensures emissions do not exceedthe appropriate level specified in§ 63.488(d), and

(2) Comply with the recordkeepingrequirements in § 63.491(d)(1), and thereporting requirements in § 63.492(a)(2),(b), and (c).

§ 63.488 Methods and procedures forbatch front-end process vent groupdetermination.

(a) General requirements. Except asprovided in paragraph (a)(3) of thissection, the owner or operator of batchfront-end process vents at affectedsources shall determine the group statusof each batch front-end process vent inaccordance with the provisions of thissection. This determination may bebased on either organic HAP or TOCemissions.

(1) The procedures specified inparagraphs (b) through (i) shall befollowed for the expected mix ofproducts for a given batch front-endprocess vent, as specified in paragraph(a)(1)(i) of this section, or for the worst-case HAP emitting batch unit operation,as specified in paragraphs (a)(1)(ii)through (a)(1)(iv) of this section.‘‘Worst-case HAP emitting product’’ isdefined in paragraph (a)(1)(iii) of thissection.

(i) If an owner or operator chooses tofollow the procedures specified inparagraphs (b) through (i) of this sectionfor the expected mix of products, anidentification of the different productsand the number of batch cyclesaccomplished for each is required aspart of the group determinationdocumentation.

(ii) If an owner or operator chooses tofollow the procedures specified inparagraphs (b) through (i) of this sectionfor the worst-case HAP emittingproduct, documentation identifying theworst-case HAP emitting product isrequired as part of the groupdetermination documentation.

(iii) Except as specified in paragraph(a)(1)(iii)(B) of this section, the worst-case HAP emitting product is as definedin paragraph (a)(1)(iii)(A) of this section.

(A) The worst-case HAP emittingproduct is the one with the highest massemission rate (kg organic HAP per hour)averaged over the entire time period ofthe batch cycle.

(B) Alternatively, when one product isproduced more than 75 percent of thetime, accounts for more than 75 percentof the annual mass of product, and theowner or operator can show that themass emission rate (kg organic HAP perhour) averaged over the entire time

period of the batch cycle can reasonablybe expected to be similar to the massemission rate for other products havingemissions from the same batch front-endprocess vent, that product may beconsidered the worst-case HAP emittingproduct.

(C) An owner or operator shalldetermine the worst-case HAP emittingproduct for a batch front-end processvent as specified in paragraphs(a)(1)(iii)(C)(1) through (a)(1)(iii)(C)(3) ofthis section.

(1) The emissions per batch emissionepisode shall be determined using anyof the procedures specified in paragraph(b) of this section. The mass emissionrate (kg organic HAP per hour) averagedover the entire time period of the batchcycle shall be determined by summingthe emissions for each batch emissionepisode making up a complete batchcycle and dividing by the total durationin hours of the batch cycle.

(2) To determine the worst-case HAPemitting product as specified underparagraph (a)(1)(iii)(A) of this section,the mass emission rate for each productshall be determined and compared.

(3) To determine the worst-case HAPemitting product as specified underparagraph (a)(1)(iii)(B) of this section,the mass emission rate for the productmeeting the time and mass criteria ofparagraph (a)(1)(iii)(B) of this sectionshall be determined, and the owner oroperator shall provide adequateinformation to demonstrate that themass emission rate for said product issimilar to the mass emission rates forthe other products having emissionsfrom the same batch process vent. Inaddition, the owner or operator shallprovide information demonstrating thatthe selected product meets the time andmass criteria of paragraph (a)(1)(iii)(B)of this section.

(iv) The annual production of theworst-case HAP emitting product shallbe determined by ratioing theproduction time of the worst-caseproduct up to a 12 month period ofactual production. It is not necessary toratio up to a maximum production rate(i.e., 8,760 hours per year at maximumdesign production).

(2) The annual uncontrolled organicHAP or TOC emissions and average flowrate shall be determined at the exit fromthe batch unit operation. For thepurposes of these determinations, theprimary condenser operating as a refluxcondenser on a distillation column, theprimary condenser recovering monomeror solvent from a batch strippingoperation, and the primary condenserrecovering monomer or solvent from abatch distillation operation shall beconsidered part of the batch unit

operation. All other devices that recoveror oxidize organic HAP or TOC vaporsshall be considered control devices asdefined in § 63.482.

(3) The owner or operator of a batchfront-end process vent complying withthe flare provisions in § 63.487(a)(1) or§ 63.487(b)(1) or routing the batch front-end process vent to a control device tocomply with the requirements in§ 63.487(a)(2) or § 63.487(b)(2) is notrequired to perform the batch front-endprocess vent group determinationdescribed in this section, but shallcomply with all requirements applicableto Group 1 batch front-end processvents.

(b) Determination of annualemissions. The owner or operator shallcalculate annual uncontrolled TOC ororganic HAP emissions for each batchfront-end process vent using themethods described in paragraphs (b)(1)through (b)(8) of this section. Paragraphs(b)(1) through (b)(4) of this sectionpresent procedures that can be used tocalculate the emissions from individualbatch emission episodes. Emissionsfrom batch front-end processesinvolving multicomponent systems areto be calculated using the procedures inparagraphs (b)(1) through (b)(4) of thissection. Individual HAP partialpressures in multicomponent systemsshall be determined by the followingmethods: If the components are misciblein one another, use Raoult’s law tocalculate the partial pressures; if thesolution is a dilute aqueous mixture, useHenry’s law constants to calculatepartial pressures; if Raoult’s law orHenry’s law are not appropriate oravailable, use experimentally obtainedactivity coefficients, Henry’s lawconstants, or solubility data; if Raoult’slaw or Henry’s law are not appropriate,use models, such as the group-contribution models, to predict activitycoefficients; and if Raoult’s law orHenry’s law are not appropriate, assumethe components of the system behaveindependently and use the summationof all vapor pressures from the HAP’s asthe total HAP partial pressure. Chemicalproperty data can be obtained fromstandard reference texts. Paragraph(b)(5) of this section describes howdirect measurement can be used toestimate emissions. If the owner oroperator can demonstrate that theprocedures in paragraphs (b)(1) through(b)(4) of this section are not appropriateto estimate emissions from a batch front-end process emission episode,emissions may be estimated usingengineering assessment, as described inparagraph (b)(6) of this section. Ownersor operators are not required todemonstrate that direct measurement is


not appropriate before utilizingengineering assessment. Paragraph(b)(6)(ii) of this section describes howan owner or operator shall demonstratethat the procedures in paragraphs (b)(1)through (b)(4) of this section are notappropriate. Emissions from a batch

cycle shall be calculated in accordancewith paragraph (b)(7) of this section,and annual emissions from the batchfront-end process vent shall becalculated in accordance with paragraph(b)(8) of this section.

(1) TOC or organic HAP emissionsfrom the purging of an empty vesselshall be calculated using Equation 1.This equation does not take into accountevaporation of any residual liquid in thevessel.

EV

RTEqepisode

ves m=( )( ) ( )

−( )P MW 1]WAVG 1 0 37. [ .

where:Eepisode=Emissions, kg/episode.Vves=Volume of vessel, m3.P=TOC or total organic HAP partial pressure, kPa.MWWAVG=Weighted average molecular weight of TOC or organic HAP in vapor, determined in accordance with paragraph

(b)(4)(iii) of this section, kg/kmol.R=Ideal gas constant, 8.314 m3•kPa/kmol•°K.T=Temperature of vessel vapor space, °K.m=Number of volumes of purge gas used.

(2) TOC or organic HAP emissions from the purging of a filled vessel shall be calculated using Equation 2.

Ey

RT P x

T Eqepisode

ii

n

i

m=( )( )( ) ( )

−

( )

=∑

V P MW

P

2]dr2

WAVG

1

[ .

where:Eepisode=Emissions, kg/episode.y=Saturated mole fraction of all TOC or

organic HAP in vapor phase.Vdr=Volumetric gas displacement rate,

m3/min.P=Pressure in vessel vapor space, kPa.MWWAVG=Weighted average molecular

weight of TOC or organic HAP invapor, determined in accordance

with paragraph (b)(4)(iii) of thissection, kg/kmol.

R=Ideal gas constant, 8.314 m3•kPa/kmol•°K.

T=Temperature of vessel vapor space,°K.

Pi=Vapor pressure of TOC or individualorganic HAP i, kPa.

xi=Mole fraction of TOC or organic HAPi in the liquid.

n=Number of organic HAP in stream.

Note: Summation not required if TOCemissions are being estimated.

Tm=Minutes/episode.

(3) Emissions from vapordisplacement due to transfer of materialinto or out of a vessel shall be calculatedusing Equation 3.

Ey V

RTEqepisode =

( )( )( )( )P MW 3]WAVG [ .

where:Eepisode=Emissions, kg/episode.y=Saturated mole fraction of all TOC or organic HAP in vapor phase.V=Volume of gas displaced from the vessel, m3.P=Pressure of vessel vapor space, kPa.MWWAVG=Weighted average molecular weight of TOC or organic HAP in vapor, determined in accordance with paragraph

(b)(4)(iii) of this section, kg/kmol.R=Ideal gas constant, 8.314 m3•kPa/kmol•°K.T=Temperature of vessel vapor space, °K.

(4) Emissions caused by the heating ofa vessel shall be calculated using theprocedures in either paragraph (b)(4)(i),(b)(4)(ii), or (b)(4)(iii) of this section, asappropriate.

(i) If the final temperature to whichthe vessel contents is heated is lower

than 50 K below the boiling point of theHAP in the vessel, then emissions shallbe calculated using the equations inparagraphs (b)(4)(i)(A) through(b)(4)(i)(D) of this section.

(A) Emissions caused by heating of avessel shall be calculated using

Equation 4. The assumptions made forthis calculation are atmosphericpressure of 760 mm Hg and thedisplaced gas is always saturated withVOC vapor in equilibrium with theliquid mixture.


E

P T

P T

P T

P T

Eq

MW MW

episode

ii

n

ii

n

ii

n

ii

n

WAVG T WAVG T

=

( )

− ( )+

( )

− ( )

( ) ( ) + ( )

=

=

=

=

∑

∑

∑

∑1

1

1

1

1 2

1

101 325 1

2

101 325 2

2

2

. .

[ .

*, ,

4]

∆η

where:Eepisode=Emissions, kg/episode.(Pi)T1, (Pi)T2=Partial pressure (kPa)

TOC or each organic HAP in thevessel headspace at initial (T1) andfinal (T2) temperature.

n=Number of organic HAP in stream.Note: Summation not required ifTOC emissions are being estimated.

∆η=Number of kilogram-moles (kg-moles) of gas displaced, determinedin accordance with paragraph(b)(4)(i)(B) of this section.

101.325=Constant, kPa.(MWWAVG,T1), (MWWAVG,T2)=Weighted

average molecular weight of TOC ororganic HAP in vapor, determinedin accordance with paragraph(b)(4)(iii) of this section.

(B) The moles of gas displaced, ∆η, iscalculated using equation 5.

∆η =

−

V

R

Pa

T

Pa

TEqfs 1

1

2

2

[ . 5]

where:∆η=Number of kg-moles of gas

displaced.Vfs=Volume of free space in the vessel,

m3.R=Ideal gas constant, 8.314 m3•kPa/

kmol•K.Pa1=Initial noncondensible gas pressure

in the vessel, kPa.Pa2=Final noncondensible gas pressure,

kPa.T1=Initial temperature of vessel, K.T2=Final temperature of vessel, K.

(C) The initial and final pressure ofthe noncondensible gas in the vesselshall be calculated using equation 6.

Pa P Tii

n

= − ( )=∑101 325

1

. [Eq. 6]

where:

Pa=Initial or final partial pressure ofnoncondensible gas in the vesselheadspace, kPa.

101.325=Constant, kPa.(Pi)T=Partial pressure of TOC or each

organic HAP i in the vesselheadspace, kPa, at the initial orfinal temperature (T1 or T2).

n=Number of organic HAP in stream.Note: Summation not required ifTOC emissions are being estimated.

(D) The weighted average molecularweight of organic HAP in the displacedgas, MWHAP, shall be calculated usingequation 7:

MW

ass of C molecular

mass of CWAVG

i

n

ii

n=( ) ( )

( )=

=

∑

∑

m i iweight of C

[Eq. 7]1

1

where:c=TOC or organic HAP componentn=Number of TOC or organic HAP

components in stream.(ii) If the vessel contents are heated to

a temperature greater than 50 K belowthe boiling point, then emissions fromthe heating of a vessel shall becalculated as the sum of the emissionscalculated in accordance withparagraphs (b)(4)(ii)(A) and (b)(4)(ii)(B)of this section.

(A) For the interval from the initialtemperature to the temperature 50 Kbelow the boiling point, emissions shallbe calculated using Equation 4, whereT2 is the temperature 50 K below theboiling point.

(B) For the interval from thetemperature 50 K below the boilingpoint to the final temperature, emissionsshall be calculated as the summation ofemissions for each 5 K increment, wherethe emissions for each increment shallbe calculated using Equation 4.

(1) If the final temperature of theheatup is lower than 5 K below theboiling point, the final temperature forthe last increment shall be the finaltemperature for the heatup, even if thelast increment is less than 5 K.

(2) If the final temperature of theheatup is higher than 5 K below theboiling point, the final temperature forthe last increment shall be thetemperature 5 K below the boiling point,

even if the last increment is less than 5K.

(3) If the vessel contents are heated tothe boiling point and the vessel is notoperating with a condenser, the finaltemperature for the final increment shallbe the temperature 5 K below theboiling point, even if the last incrementis less than 5 K.

(iii) If the vessel is operating with acondenser, and the vessel contents areheated to the boiling point, the primarycondenser is considered part of theprocess, as described in § 63.488(a)(2).Emissions shall be calculated as the sumof Equation 4, which calculatesemissions due to heating the vesselcontents to the temperature of the gas


exiting the condenser, and Equation 3,which calculates emissions due to thedisplacement of the remaining saturatednoncondensible gas in the vessel. Thefinal temperature in Equation 4 shall beset equal to the exit gas temperature ofthe condenser. Equation 3 shall be usedas written below in Equation 3a, usingfree space volume, and T2 is set equalto the condenser exit gas temperature.

Ey

Tepisodei= ( )( )( )( )

( )( )V P MW

R[Eq. 3a]fs T HAP

where:Eepisode=Organic HAP emissions, kg/

episode.yi=Saturated mole fraction of organic

HAP in the vapor phase.Vfs=Volume of the free space in the

vessel, m3.PT=Pressure of the vessel vapor space,

kPa.MWHAP=Weighted average molecular

weight of organic HAP in vapor,determined in accordance withparagraph (b)(4)(iii) of this section.

R=Ideal gas constant, 8.314 m3•kPa/kmol•K.

T=Temperature of condenser exit streamK.

n=Number of organic HAP in stream.(5) The owner or operator may

estimate annual emissions for a batchemission episode by directmeasurement. If direct measurement isused, the owner or operator shall eitherperform a test for the duration of arepresentative batch emission episodeor perform a test during only thoseperiods of the batch emission episodefor which the emission rate for theentire episode can be determined or forwhich the emissions are greater than theaverage emission rate of the batchemission episode. The owner oroperator choosing either of theseoptions must develop an emissionprofile for the entire batch emissionepisode, based on either processknowledge or test data collected, todemonstrate that test periods arerepresentative. Examples of informationthat could constitute process knowledgeinclude calculations based on materialbalances and process stoichiometry.Previous test results may be usedprovided the results are still relevant tothe current batch process ventconditions. Performance tests shallfollow the procedures specified inparagraphs (b)(5)(i) through (b)(5)(iii) ofthis section. The procedures in eitherparagraph (b)(5)(iv) or (b)(5)(v) of thissection shall be used to calculate theemissions per batch emission episode.

(i) Method 1 or 1A, as appropriate,shall be used for selection of the

sampling sites if the flow measuringdevice is a pitot tube. No traverse isnecessary when Method 2A or 2D isused to determine gas stream volumetricflow rate.

(ii) Gas stream volumetric flow rateand/or average flow rate shall bedetermined as specified in paragraph (e)of this section.

(iii) Method 18 or Method 25A, of 40CFR part 60, appendix A, shall be usedto determine the concentration of TOCor organic HAP, as appropriate. The useof Method 25A shall comply withparagraphs (b)(5)(iii)(A) and (b)(5)(iii)(B)of this section.

(A) The organic HAP used as thecalibration gas for Method 25A shall bethe single organic HAP representing thelargest percent by volume of theemissions.

(B) The use of Method 25A isacceptable if the response from the high-level calibration gas is at least 20 timesthe standard deviation of the responsefrom the zero calibration gas when theinstrument is zeroed on the mostsensitive scale.

(iv) If an integrated sample is takenover the entire batch emission episodeto determine TOC or average totalorganic HAP concentration, emissionsshall be calculated using Equation 8.

E K C M AFR Tepisode j jj

n

h= ( )( )

( )=∑

1

[Eq. 8]

where:Eepisode=Emissions, kg/episodeK=Constant, 2.494 × 10¥6 (ppmv) ¥1

(gm-mole/scm) (kg/gm) (min/hr),where standard temperature is20°C.

Cj=Average concentration of TOC orsample organic HAP component j ofthe gas stream for the batchemission episode, dry basis, ppmv.

Mj=Molecular weight of TOC or samplecomponent j of the gas stream, drybasis, gm/gm-mole.

AFR=Average flow rate of gas stream,dry basis, scmm.

Th=Hours/episoden=Number of organic HAP in stream.

Note: Summation not required ifTOC emissions are being estimatedusing a TOC concentrationmeasured using Method 25A.

(v) If grab samples are taken todetermine TOC or average total organicHAP concentration, emissions shall becalculated according to paragraphs(b)(5)(v)(A) and (b)(5)(v)(B) of thissection.

(A) For each measurement point, theemission rate shall be calculated usingEquation 9.

E K C M FRpo j jj

n

int =

=

∑1

[Eq. 9]

where:Epoint=Emission rate for individual

measurement point, kg/hr.K=Constant, 2.494 × 10¥6 (ppmv)¥1


Cj=Concentration of TOC or samplecomponent j of the gas stream, drybasis, ppmv.

Mj=Molecular weight of TOC or samplecomponent j of the gas stream, gm/gm-mole.

FR=Flow rate of gas stream for themeasurement point, dry basis,scmm.

n=Number of organic HAP in stream.Note: Summation not required ifTOC emissions are being estimatedusing a TOC concentrationmeasured using Method 25A.

(B) The emissions per batch emissionepisode shall be calculated usingEquation 10.

E DURE

nepisodei

i

n

=

=∑( )

1

[Eq. 10]

where:Eepisode=Emissions, kg/episode.DUR=Duration of the batch emission

episode, hr/episode.Ei=Emissions for measurement point i,

kg/hr.n=Number of measurements.

(6) If the owner or operator candemonstrate that the methods inparagraphs (b)(1) through (b)(4) of thissection are not appropriate to estimateemissions for a batch emissions episode,the owner or operator may useengineering assessment to estimateemissions as specified in paragraphs(b)(6)(i) and (b)(6)(ii) of this section. Alldata, assumptions, and procedures usedin an engineering assessment shall bedocumented.

(i) Engineering assessment includes,but is not limited to, the following:

(A) Previous test results, provided thetests are representative of currentoperating practices.

(B) Bench-scale or pilot-scale test datarepresentative of the process underrepresentative operating conditions.

(C) Flow rate, TOC emission rate, ororganic HAP emission rate specified orimplied within a permit limit applicableto the batch front-end process vent.

(D) Design analysis based on acceptedchemical engineering principles,measurable process parameters, orphysical or chemical laws or properties.Examples of analytical methods include,but are not limited to:


(1) Use of material balances,(2) Estimation of flow rate based on

physical equipment design, such aspump or blower capacities, and

(3) Estimation of TOC or organic HAPconcentrations based on saturationconditions.

(ii) The emissions estimationequations in paragraphs (b)(1) through(b)(4) of this section shall be consideredinappropriate for estimating emissionsfor a given batch emissions episode ifone or more of the criteria in paragraphs(b)(6)(ii)(A) through (b)(6)(ii)(B) of thissection are met.

(A) Previous test data are availablethat show a greater than 20 percentdiscrepancy between the test value andthe estimated value.

(B) The owner or operator candemonstrate to the Administratorthrough any other means that theemissions estimation equations are notappropriate for a given batch emissionsepisode.

(C) Data or other informationsupporting a finding that the emissionsestimation equations are inappropriateas specified under paragraph(b)(6)(ii)(A) of this section shall bereported in the Notification ofCompliance Status, as required in§ 63.506(e)(5).

(D) Data or other informationsupporting a finding that the emissionsestimation equations are inappropriateas specified under paragraph (b)(6)(ii)(B)of this section shall be reported in thePrecompliance Report, as required in§ 63.506(e)(3).

(7) For each batch front-end processvent, the TOC or organic HAP emissionsassociated with a single batch cycleshall be calculated using Equation 11.

E Ecycle episodei

n

i=

=∑

1

[Eq. 11]

where:Ecycle=Emissions for an individual batch

cycle, kg/batch cycle.Eepisodei=Emissions from a batch

emission episode i, kg/episode.n=Number of batch emission episodes

for the batch cycle.(8) Annual TOC or organic HAP

emissions from a batch front-endprocess vent shall be calculated usingEquation 12.

AE N Ei cyclei

n

i= ( )( )

=∑ [Eq. 12]

1

where:AE=Annual emissions from a batch

front-end process vent, kg/yr.Ni=Number of type i batch cycles

performed annually, cycles/year.

Ecyclei=Emissions from the batch front-end process vent associated withsingle type i batch cycle, asdetermined in paragraph (b)(7) ofthis section, kg/batch cycle.

n=Number of different types of batchcycles that cause the emission ofTOC or organic HAP from the batchfront-end process vent.

(c) [Reserved](d) Minimum emission level

exemption. A batch front-end processvent with annual emissions less than11,800 kg/yr is considered a Group 2batch front-end process vent and theowner or operator of that batch front-end process vent shall comply with therequirements in § 63.487 (f) or (g). Theowner or operator of that batch front-end process vent is not required tocomply with the provisions inparagraphs (e) through (g) of thissection.

(e) Determination of average flow rate.The owner or operator shall determinethe average flow rate for each batchemission episode in accordance withone of the procedures provided inparagraphs (e)(1) through (e)(2) of thissection. The annual average flow rate fora batch front-end process vent shall becalculated as specified in paragraph(e)(3) of this section.

(1) Determination of the average flowrate for a batch emission episode bydirect measurement shall be made usingthe procedures specified in paragraphs(e)(1)(i) through (e)(1)(iii) of this section.

(i) The vent stream volumetric flowrate (Qs) for a batch emission episode, inscmm at 20 °C, shall be determinedusing Method 2, 2A, 2C, or 2D of 40 CFRpart 60, appendix A, as appropriate.

(ii) The volumetric flow rate of arepresentative batch emission episodeshall be measured every 15 minutes.

(iii) The average flow rate for a batchemission episode shall be calculatedusing Equation 13.

AFR

FR

nepisode

ii

n

= =∑

1 [Eq. 13]

where:AFRepisode=Average flow rate for the

batch emission episode, scmm.FRi=Flow rate for individual

measurement i, scmm.n=Number of flow rate measurements

taken during the batch emissionepisode.

(2) The average flow rate for a batchemission episode may be determined byengineering assessment, as defined inparagraph (b)(6)(i) of this section. Alldata, assumptions, and procedures usedshall be documented.

(3) The annual average flow rate for abatch front-end process vent shall becalculated using Equation 14.

AFR

DUR

DUR

ii

n

ii

n=( )( )

( )=

=

∑

∑

AFR

[Eq. 14]episode,i

1

1

where:AFR=Annual average flow rate for the

batch front-end process vent, scmm.DURi=Duration of type i batch emission

episodes annually, hr/yr.AFRepisode,i=Average flow rate for type i

batch emission episode, scmm.n=Number of types of batch emission

episodes venting from the batchfront-end process vent.

(f) Determination of cutoff flow rate.For each batch front-end process vent,the owner or operator shall calculate thecutoff flow rate using Equation 15.

CFR = (0.00437)(AE) [Eq. 15]− 51 6.

where:CFR=Cutoff flow rate, scmm.AE=Annual TOC or organic HAP

emissions, as determined inparagraph (b)(8) of this section, kg/yr.

(g) Group 1/Group 2 statusdetermination. The owner or operatorshall compare the cutoff flow rate,calculated in accordance with paragraph(f) of this section, with the annualaverage flow rate, determined inaccordance with paragraph (e)(3) of thissection. The group determination statusfor each batch front-end process ventshall be made using the criteriaspecified in paragraphs (g)(1) and (g)(2)of this section.

(1) If the cutoff flow rate is greaterthan or equal to the annual average flowrate of the stream, the batch front-endprocess vent is classified as a Group 1batch front-end process vent.

(2) If the cutoff flow rate is less thanthe annual average flow rate of thestream, the batch front-end process ventis classified as a Group 2 batch front-end process vent.

(h) Determination of halogenationstatus. To determine whether a batchfront-end process vent or an aggregatebatch vent stream is halogenated, theannual mass emission rate of halogenatoms contained in organic compoundsshall be calculated using the proceduresspecified in paragraphs (h)(1) through(h)(3) of this section.

(1) The concentration of each organiccompound containing halogen atoms(ppmv, by compound) for each batchemission episode shall be determinedbased on the following procedures:


(i) Process knowledge that nohalogens or hydrogen halides arepresent in the process may be used todemonstrate that a batch emissionepisode is nonhalogenated. Halogens orhydrogen halides that areunintentionally introduced into theprocess shall not be considered in

making a finding that a batch emissionepisode is nonhalogenated.

(ii) Engineering assessment asdiscussed in paragraph (b)(6)(i) of thissection.

(iii) Concentration of organiccompounds containing halogens andhydrogen halides as measured byMethod 26 or 26A of 40 CFR part 60,appendix A.

(iv) Any other method or data that hasbeen validated according to theapplicable procedures in Method 301 ofappendix A of this part.

(2) The annual mass emissions ofhalogen atoms for a batch front-endprocess vent shall be calculated usingEquation 16.

E K AFRha enj

n

i

m

log = ( )( )( )

= =

∑ ∑1 1

C L M [Eq. 16]avg j,i j,ij

where:Ehalogen=Mass of halogen atoms, dry

basis, kg/yr.K=Constant, 0.022 (ppmv)¥1 (kg-mole

per scm) (min/yr), where standardtemperature is 20°C.

AFR=Annual average flow rate of thebatch front-end process vent,

determined according to paragraph(e) of this section, scmm.

Mj,i=Molecular weight of halogen atomi in compound j, kg/kg-mole.

Lj,i=Number of atoms of halogen i incompound j.

n=Number of halogenated compounds jin the batch front-end process vent.

m=Number of different halogens i ineach compound j of the batch front-end process vent.

Cavgj=Average annual concentration ofhalogenated compound j in thebatch front-end process vent, asdetermined by using Equation 17,dry basis, ppmv.

C

DUR

DURavg

ii

n

ii

nj=

( )( )

( )=

=

∑

∑1

1

C

[Eq. 17]i

where:DURi=Duration of type i batch emission

episodes annually, hr/yr.Ci=Average concentration of

halogenated compound j in type ibatch emission episode, ppmv.

n=Number of types of batch emissionepisodes venting from the batchfront-end process vent.

(3) The annual mass emissions ofhalogen atoms for an aggregate batchvent stream shall be the sum of theannual mass emissions of halogen atomsfor all batch front-end process ventsincluded in the aggregate batch ventstream.

(i) Process changes affecting Group 2batch front-end process vents.Whenever process changes, as describedin paragraph (i)(1) of this section, aremade that affect one or more Group 2batch front-end process vents, the owneror operator shall comply withparagraphs (i)(2) and (i)(3) of thissection.

(1) Examples of process changesinclude, but are not limited to, changesin production capacity, production rate,feedstock type, or catalyst type; orwhenever there is replacement, removal,or modification of recovery equipmentconsidered part of the batch unitoperation as specified in paragraph(a)(2) of this section. An increase in the

annual number of batch cycles beyondthe batch cycle limitation constitutes aprocess change. For purposes of thisparagraph, process changes do notinclude: Process upsets; unintentional,temporary process changes; and changesthat are within the margin of variationon which the original groupdetermination was based.

(2) For each batch front-end processvent affected by a process change, theowner or operator shall redetermine thegroup status by repeating the proceduresspecified in paragraphs (b) through (g)of this section, as applicable.Alternatively, engineering assessment,as described in paragraph (b)(6)(i) of thissection, can be used to determine theeffects of the process change.

(3) Based on the results of paragraph(i)(2) of this section, owners or operatorsshall comply with either paragraph (i)(3)(i), (ii), or (iii) of this section.

(i) If the redetermination described inparagraph (i)(2) of this section indicatesthat a Group 2 batch front-end processvent has become a Group 1 batch front-end process vent as a result of theprocess change, the owner or operatorshall submit a report as specified in§ 63.492(b) and shall comply with theGroup 1 provisions in § 63.487 through§ 63.492 in accordance with the

compliance schedule described in§ 63.506(e)(6)(iii)(D)(2).

(ii) If the redetermination described inparagraph (i)(2) of this section indicatesthat a Group 2 batch front-end processvent with annual emissions less thanthe applicable level specified inparagraph (d) of this section, and that isin compliance with § 63.487(g), now hasannual emissions greater than or equalto the applicable level specified byparagraph (d) of this section but remainsa Group 2 batch front-end process vent,the owner or operator shall submit areport as specified in § 63.492(c) andshall comply with § 63.487(f) inaccordance with the complianceschedule required by§ 63.506(e)(6)(iii)(D)(2).

(iii) If the redetermination describedin paragraph (i)(2) of this sectionindicates no change in group status orno change in the relation of annualemissions to the levels specified inparagraph (d) of this section, the owneror operator is not required to submit areport, as described in § 63.492(d).

§ 63.489 Batch front-end process vents—monitoring requirements.

(a) General requirements. Each owneror operator of a batch front-end processvent or aggregate batch vent stream thatuses a control device to comply with the


requirements in § 63.487(a)(2) or§ 63.487(b)(2) shall install themonitoring equipment specified inparagraph (b) of this section.

(1) This monitoring equipment shallbe in operation at all times when batchemission episodes, or portions thereof,that the owner or operator has selectedto control are vented to the controldevice, or at all times when an aggregatebatch vent stream is vented to thecontrol device.

(2) The owner or operator shalloperate control devices such thatmonitored parameters remain above theminimum level or below the maximumlevel, as appropriate, established asspecified in paragraph (e) of thissection.

(b) Batch front-end process vent andaggregate batch vent stream monitoringparameters. The monitoring equipmentspecified in paragraphs (b)(1) through(b)(8) of this section shall be installed asspecified in paragraph (a) of thissection. The parameters to be monitoredare specified in Table 6 of this subpart.

(1) Where an incinerator is used, atemperature monitoring deviceequipped with a continuous recorder isrequired.

(i) Where an incinerator other than acatalytic incinerator is used, thetemperature monitoring device shall beinstalled in the firebox or in theductwork immediately downstream ofthe firebox in a position before anysubstantial heat exchange occurs.

(ii) Where a catalytic incinerator isused, temperature monitoring devicesshall be installed in the gas streamimmediately before and after thecatalyst bed.

(2) Where a flare is used, a device(including, but not limited to, athermocouple, ultra-violet beam sensor,or infrared sensor) capable ofcontinuously detecting the presence of apilot flame is required.

(3) Where a boiler or process heater ofless than 44 megawatts design heatinput capacity is used, a temperaturemonitoring device in the fireboxequipped with a continuous recorder isrequired. Any boiler or process heater inwhich all batch front-end process ventsor aggregate batch vent streams areintroduced with the primary fuel or areused as the primary fuel is exempt fromthis requirement.

(4) Where a scrubber is used with anincinerator, boiler, or process heater inconcert with the combustion ofhalogenated batch front-end processvents, the following monitoringequipment is required for the scrubber:

(i) A pH monitoring device equippedwith a continuous recorder to monitorthe pH of the scrubber effluent; and

(ii) A flow meter equipped with acontinuous recorder shall be located atthe scrubber influent to monitor thescrubber liquid flow rate.

(5) Where an absorber is used, ascrubbing liquid temperaturemonitoring device and a specific gravitymonitoring device are required, eachequipped with a continuous recorder.

(6) Where a condenser is used, acondenser exit temperature (productside) monitoring device equipped witha continuous recorder is required.

(7) Where a carbon adsorber is used,an integrating regeneration stream flowmonitoring device having an accuracy of±10 percent, capable of recording thetotal regeneration stream mass flow foreach regeneration cycle; and a carbonbed temperature monitoring device,capable of recording the carbon bedtemperature after each regeneration andwithin 15 minutes of completing anycooling cycle are required.

(8) As an alternate to paragraphs (b)(5)through (b)(7) of this section, the owneror operator may install an organicmonitoring device equipped with acontinuous recorder.

(c) Alternative monitoring parameters.An owner or operator of a batch front-end process vent or aggregate batch ventstream may request approval to monitorparameters other than those required byparagraph (b) of this section. Therequest shall be submitted according tothe procedures specified in § 63.506(f).Approval shall be requested if theowner or operator:

(1) Uses a control device other thanthose included in paragraph (b) of thissection; or

(2) Uses one of the control devicesincluded in paragraph (b) of thissection, but seeks to monitor aparameter other than those specified inTable 6 of this subpart and paragraph (b)of this section.

(d) Monitoring of bypass lines. Theowner or operator of a batch front-endprocess vent or aggregate batch ventstream using a vent system that containsbypass lines that could divert emissionsaway from a control device used tocomply with § 63.487(a) or § 63.487(b)shall comply with either paragraph(d)(1), (d)(2), or (d)(3) of this section.Equipment such as low leg drains, highpoint bleeds, analyzer vents, open-ended valves or lines, and pressurerelief valves needed for safety purposesare not subject to this paragraph.

(1) Properly install, maintain, andoperate a flow indicator that takes areading at least once every 15 minutes.Records shall be generated as specifiedin § 63.491(e)(3). The flow indicatorshall be installed at the entrance to anybypass line that could divert emissions

away from the control device and to theatmosphere; or

(2) Secure the bypass line valve in thenon-diverting position with a car-seal ora lock-and-key type configuration. Avisual inspection of the seal or closuremechanism shall be performed at leastonce every month to ensure that thevalve is maintained in the non-divertingposition and emissions are not divertedthrough the bypass line. Records shallbe generated as specified in§ 63.491(e)(4).

(3) Continuously monitor the bypassline damper or valve position usingcomputer monitoring and record anyperiods when the position of the bypassline damper or valve has changed asspecified in § 63.491(e)(4).

(e) Establishment of parametermonitoring levels. Parameter monitoringlevels for batch front-end process ventsand aggregate batch vent streams shallbe established as specified inparagraphs (e)(1) through (e)(3) of thissection.

(1) For each parameter monitoredunder paragraph (b) of this section, theowner or operator shall establish a level,defined as either a maximum orminimum operating parameter asdenoted in Table 7 of this subpart, thatindicates proper operation of the controldevice. The level shall be established inaccordance with the proceduresspecified in § 63.505.

(i) For batch front-end process ventsusing a control device to comply with§ 63.487(a)(2), the established level shallreflect the control efficiency establishedas part of the initial compliancedemonstration specified in§ 63.490(c)(2).

(ii) For aggregate batch vent streamsusing a control device to comply with§ 63.487(b)(2), the established level shallreflect the control efficiencyrequirement specified in § 63.487(b)(2).

(2) The established level, along withsupporting documentation, shall besubmitted in the Notification ofCompliance Status or the operatingpermit application as required in§ 63.506(e)(5) or § 63.506(e)(8),respectively.

(3) The operating day shall be definedas part of establishing the parametermonitoring level and shall be submittedwith the information in paragraph (e)(2)of this section. The definition ofoperating day shall specify the times atwhich an operating day begins andends. The operating day shall notexceed 24 hours.


§ 63.490 Batch front-end process vents—performance test methods and proceduresto determine compliance.

(a) Use of a flare. When a flare is usedto comply with § 63.487(a)(1) or§ 63.487(b)(1), the owner or operatorshall comply with the flare provisionsin § 63.11(b) of subpart A.

(b) Exceptions to performance tests.An owner or operator is not required toconduct a performance test when acontrol device specified in paragraphs(b)(1) through (b)(4) of this section isused to comply with § 63.487(a)(2).

(1) A boiler or process heater with adesign heat input capacity of 44megawatts or greater.

(2) A boiler or process heater wherethe vent stream is introduced with theprimary fuel or is used as the primaryfuel.

(3) A control device for which aperformance test was conducted fordetermining compliance with a newsource performance standard (NSPS)and the test was conducted using thesame procedures specified in thissection and no process changes havebeen made since the test.

(4) A boiler or process heater burninghazardous waste for which the owner oroperator:

(i) Has been issued a final permitunder 40 CFR part 270 and complieswith the requirements of 40 CFR part266, subpart H; or

(ii) Has certified compliance with theinterim status requirements of 40 CFRpart 266, subpart H.

(5) An incinerator burning hazardouswaste for which the owner or operatorcomplies with the requirements of 40CFR part 264, subpart O.

(6) Performance tests done for othersubparts in part 60 or part 63 wheretotal organic HAP or TOC wasmeasured, provided that the owner oroperator can demonstrate that operatingconditions for the process and controldevice during the performance test arerepresentative of current operatingconditions.

(c) Batch front-end process venttesting and procedures for compliancewith § 63.487(a)(2). Except as providedin paragraph (b) of this section, anowner or operator using a control deviceto comply with § 63.487(a)(2) shallconduct a performance test using theprocedures specified in paragraph (c)(1)of this section in order to determine the

control efficiency of the control device.An owner or operator shall determinethe percent reduction for the batch cycleusing the control efficiency of thecontrol device as specified inparagraphs (c)(2)(i) through (c)(2)(iii) ofthis section and the proceduresspecified in paragraph (c)(2) of thissection. Compliance may be based oneither total organic HAP or TOC. Forpurposes of this paragraph and allparagraphs that are part of paragraph (c)of this section, the term ‘‘batch emissionepisode’’ shall have the meaning‘‘period of the batch emission episodeselected for control,’’ which may be theentire batch emission episode or mayonly be a portion of the batch emissionepisode.

(1) Performance tests shall beconducted as specified in paragraphs(c)(1)(i) through (c)(1)(v) of this section.

(i) Except as specified in paragraph(c)(1)(i)(A) of this section, a test shall beperformed for the entire period of eachbatch emission episode in the batchcycle that the owner or operator selectsto control as part of achieving therequired 90 percent emission reductionfor the batch cycle specified in§ 63.487(a)(2). Only one test is requiredfor each batch emission episode selectedby the owner or operator for control.The owner or operator shall follow theprocedures listed in paragraphs(c)(1)(i)(B) through (c)(1)(i)(D) of thissection.

(A) Alternatively, an owner oroperator may choose to test only thoseperiods of the batch emission episodeduring which the emission rate for theentire episode can be determined orduring which the emissions are greaterthan the average emission rate of thebatch emission episode. The owner oroperator choosing either of theseoptions must develop an emissionprofile for the entire batch emissionepisode, based on either processknowledge or test data collected, todemonstrate that test periods arerepresentative. Examples of informationthat could constitute process knowledgeinclude calculations based on materialbalances and process stoichiometry.Previous test results may be used,provided the results are still relevant tothe current batch front-end process ventconditions.

(B) Method 1 or 1A, as appropriate,shall be used for selection of the

sampling sites if the flow measuringdevice is a pitot tube. No traverse isnecessary when Method 2A or 2D isused to determine gas stream volumetricflow rate. Inlet sampling sites shall belocated as specified in paragraphs(c)(1)(i)(B)(1) and (c)(1)(i)(B)(2) of thissection. Outlet sampling sites shall belocated at the outlet of the final controldevice prior to release to theatmosphere.

(1) The control device inlet samplingsite shall be located at the exit from thebatch unit operation before any controldevice. Section 63.488(a)(2) describesthose recovery devices considered partof the unit operation. Inlet samplingsites would be after these specifiedrecovery devices.

(2) If a batch process vent isintroduced with the combustion air oras a secondary fuel into a boiler orprocess heater with a design capacityless than 44 megawatts, selection of thelocation of the inlet sampling sites shallensure the measurement of total organicHAP or TOC (minus methane andethane) concentrations in all batchfront-end process vents and primary andsecondary fuels introduced into theboiler or process heater.

(C) Gas stream volumetric flow rateand/or average flow rate shall bedetermined as specified in § 63.488(e).

(D) Method 18 or Method 25A of 40CFR part 60, Appendix A, shall be usedto determine the concentration oforganic HAP or TOC, as appropriate.The use of Method 25A shall complywith paragraphs (c)(1)(i)(D)(1) and(c)(1)(i)(D)(2) of this section.

(1) The organic HAP used as thecalibration gas for Method 25A shall bethe single organic HAP representing thelargest percent by volume of theemissions.


(ii) If an integrated sample is takenover the entire batch emission episodeto determine TOC or average totalorganic HAP concentration, emissionsper batch emission episode shall becalculated using Equations 18 and 19.

E K C AFRepisode inlet j inletj

n

inlet, ,= ( )( )

( )( )

=∑ M T [Eq. 18]j h

1


E K C AFRepisode outlet j outletj

n

outlet, ,= ( )( )

( )( )

=∑ M T [Eq. 19]j h

1

where:Eepisode=Inlet or outlet emissions, kg/

episode.K=Constant, 2.494 × 10¥6 (ppmv)¥1


Cj=Average inlet or outlet concentrationof TOC or sample component j ofthe gas stream for the batchemission episode, dry basis, ppmv.

Mj=Molecular weight of TOC or samplecomponent j of the gas stream, gm/gm-mole.

AFR=Average inlet or outlet flow rate ofgas stream for the batch emissionepisode, dry basis, scmm.

Th=Hours/episode.

n=Number of organic HAP in stream.Note: Summation not required ifTOC emissions are being estimated

using a TOC concentrationmeasured using Method 25A.

(iii) If grab samples are taken todetermine TOC or total organic HAPconcentration, emissions shall becalculated according to paragraphs(c)(1)(iii)(A) and (c)(1)(iii)(B) of thissection.

(A) For each measurement point, theemission rates shall be calculated usingEquations 20 and 21.

E K C M FRpo inlet j jj

n

inletint, =

=

∑1

[Eq. 20]

E K C M FR Eqpo outlet j jj

n

outletint, .=

[ ]=∑

1

21

where:Epoint=Inlet or outlet emission rate for

the measurement point, kg/hr.K=Constant, 2.494×10¥6 (ppmv)¥1 (gm-

mole/scm) (kg/gm) (min/hr), wherestandard temperature is 20°C.

Cj=Inlet or outlet concentration of TOCor sample organic HAP componentj of the gas stream, dry basis, ppmv.

Mj=Molecular weight of TOC or sampleorganic HAP component j of the gasstream, gm/gm-mole.

FR=Inlet or outlet flow rate of gasstream for the measurement point,dry basis, scmm.

n=Number of organic HAP in stream.Note: Summation not required if TOC

emissions are being estimated using a TOCconcentration measured using Method 25A.

(B) The emissions per batch emissionepisode shall be calculated usingEquations 22 and 23.

E DURE

nepisode inletpoint inlet i

i

n

,, ,( )=

=

∑1

[Eq. 22]

E DURE

nepisode outletpoint outlet i

i

n

,, ,( )=

=

∑1

[Eq. 23]

where:Eepisode=Inlet or outlet emissions, kg/

episode.DUR=Duration of the batch emission

episode, hr/episode.Epoint,i=Inlet or outlet emissions for

measurement point i, kg/hr.n=Number of measurements.

(iv) The control efficiency for thecontrol device shall be calculated usingEquation 24.

R

E E

E

inlet i outlet ii

n

i

n

inlet ii

n=−

==

=

∑∑

∑

, ,

,

( )11

1

100 [Eq. 24]

Where:R=Control efficiency of control device,

percent.Einleti=Mass rate of TOC or total organic

HAP for batch emission episode i atthe inlet to the control device ascalculated under paragraph (c)(1)(ii)or (c)(1)(iii) of this section, kg/hr.

Eoutleti=Mass rate of TOC or total organicHAP for batch emission episode i atthe outlet of the control device, ascalculated under paragraph (c)(1)(ii)or (c)(1)(iii) of this section, kg/hr.

n=Number of batch emission episodesin the batch cycle selected to becontrolled.

(v) If the batch front-end process vententering a boiler or process heater witha design capacity less than 44megawatts is introduced with thecombustion air or as a secondary fuel,the weight-percent reduction of totalorganic HAP or TOC across the deviceshall be determined by comparing theTOC or total organic HAP in allcombusted batch front-end processvents and primary and secondary fuelswith the TOC or total organic HAPexiting the combustion device,respectively.

(2) The percent reduction for thebatch cycle shall be determined usingEquation 25 and the control deviceefficiencies specified in paragraphs(c)(2)(i) through (c)(2)(iii) of this section.All information used to calculate thebatch cycle percent reduction, includinga definition of the batch cycleidentifying all batch emission episodes,must be recorded as specified in§ 63.491(b)(2). This information shallinclude identification of those batchemission episodes, or portions thereof,selected for control.


Percent Re

E E R

E E

unc inlet coni

n

i

n

i

n

unc inlet coni

n

i

nduction =

(E

[Eq. 25]inlet,con+ − −

+

===

==

∑∑∑

∑∑

,

,

( ) )1

100111

11

where:Eunc=Mass rate of TOC or total organic

HAP for uncontrolled batchemission episode i, kg/hr.

Einletcon=Mass rate of TOC or total organicHAP for controlled batch emissionepisode i at the inlet to the controldevice, kg/hr.

R=Control efficiency of control deviceas specified in paragraphs (c)(2)(i)through (c)(2)(iii) of this section.

n=Number of uncontrolled batchemission episodes, controlled batchemission episodes, and controldevices. The value of n is notnecessarily the same for these threeitems.

(i) If a performance test is required byparagraph (c) of this section, the controlefficiency of the control device shall beas determined in paragraph (c)(1)(iv) ofthis section.

(ii) If a performance test is notrequired by paragraph (c) of this sectionfor a combustion control device, asspecified in paragraph (b) of thissection, the control efficiency of thecontrol device shall be 98 percent. Thecontrol efficiency for a flare shall be 98percent.

(iii) If a performance test is notrequired by paragraph (c) of this sectionfor a noncombustion control device, thecontrol efficiency shall be determinedby the owner or operator based onengineering assessment.

(d) Batch process vent and aggregatebatch vent stream testing for compliancewith § 63.487(c) [halogenated emissionstreams]. An owner or operatorcontrolling halogenated emissions incompliance with § 63.487(c) shallconduct a performance test to determinecompliance with the control efficiencyspecified in § 63.487(c)(1) or theemission limit specified in§ 63.487(c)(2) for hydrogen halides andhalogens.

(1) Sampling sites shall be located atthe inlet and outlet of the scrubber orother control device used to reducehalogen emissions in complying with§ 63.487(c)(1) or at the outlet of thecontrol device used to reduce halogenemissions in complying with§ 63.487(c)(2).

(2) The mass emissions of eachhydrogen halide and halogen compoundfor the batch cycle or aggregate batchvent stream shall be calculated from themeasured concentrations and the gas

stream flow rate(s) determined by theprocedures specified in paragraphs(d)(2)(i) and (d)(2)(ii) of this section,except as specified in paragraph (d)(5)of this section.

(i) Method 26 or Method 26A of 40CFR part 60, appendix A, shall be usedto determine the concentration, in Mgper dry scm, of total hydrogen halidesand halogens present in the emissionsstream.

(ii) Gas stream volumetric flow rateand/or average flow rate shall bedetermined as specified in § 63.488(e).

(3) To determine compliance with thepercent reduction specified in§ 63.487(c)(1), the mass emissions forany hydrogen halides and halogenspresent at the inlet of the scrubber orother control device shall be summedtogether. The mass emissions of anyhydrogen halides or halogens present atthe outlet of the scrubber or othercontrol device shall be summedtogether. Percent reduction shall bedetermined by subtracting the outletmass emissions from the inlet massemissions and then dividing the resultby the inlet mass emissions.

(4) To determine compliance with theemission limit specified in§ 63.487(c)(2), the annual massemissions for any hydrogen halides andhalogens present at the outlet of thecontrol device and prior to anycombustion device shall be summedtogether and compared to the emissionlimit specified in § 63.487(c)(2).

(5) The owner or operator may useany other method to demonstratecompliance if the method or data hasbeen validated according to theapplicable procedures of Method 301 ofappendix A.

(e) Aggregate batch vent streamtesting for compliance with§ 63.487(b)(2). Owners or operators ofaggregate batch vent streams complyingwith § 63.487(b)(2) shall conduct aperformance test using the performancetesting procedures for continuous front-end process vents in § 63.116(c) ofsubpart G. For the purposes of thissubpart, when the provisions of§ 63.116(c) specify that Method 18 shallbe used, Method 18 or Method 25A maybe used. The use of Method 25A shallcomply with paragraphs (e)(1) and (e)(2)of this section.

(1) The organic HAP used as thecalibration gas for Method 25A shall be

the single organic HAP representing thelargest percent by volume of theemissions.


(f) Batch cycle limitation. The batchcycle limitation required by§ 63.487(f)(1) and § 63.487(g)(1) shall beestablished as specified in paragraph(f)(1) of this section and shall includethe elements specified in paragraph(f)(2) of this section.

(1) The batch cycle limitation shall bedetermined by the owner or operatorsuch that annual emissions for the batchfront-end process vent remain less thanthe level specified in § 63.488(d) whencomplying with § 63.487(g).Alternatively, when complying with§ 63.487(f), the batch cycle limitationshall ensure that annual emissionsremain at a level such that the batchfront-end process vent remains a Group2 batch front-end process vent, given theactual annual flow rate for that batchfront-end process vent determinedaccording to § 63.488(e)(3). The batchcycle limitation shall be determinedusing the same basis, as described in§ 63.488(a)(1), used to make the groupdetermination (i.e., expected mix ofproducts or worst-case HAP emittingproduct). The establishment of the batchcycle limitation is not dependent uponany past production or activity level.

(i) If the expected mix of productsserves as the basis for the batch cyclelimitation, the batch cycle limitationshall be determined such that anyforeseeable combination of productswhich the owner or operator desires theflexibility to manufacture shall beallowed. Combinations of products notaccounted for in the documentationrequired by paragraph (f)(2)(iv) of thissection shall not be allowed within therestrictions of the batch cycle limitation.

(ii) If, for a batch front-end processvent with more than one product, asingle worst-case HAP emitting productserves as the basis for the batch cyclelimitation, the batch cycle limitationshall be determined such that themaximum number of batch cycles theowner or operator desires the flexibilityto accomplish, using the worst-case


HAP emitting product and ensuring thatthe batch front-end process ventremains a Group 2 batch front-endprocess vent or that emissions remainless than the level specified in§ 63.488(d), shall be allowed. This valueshall be the total number of batch cyclesallowed within the restrictions of thebatch cycle limitation regardless ofwhich products are manufactured.

(2) Documentation supporting theestablishment of the batch cyclelimitation shall include the informationspecified in paragraphs (f)(2)(i) through(f)(2)(v) of this section, as appropriate.

(i) Identification that the purpose ofthe batch cycle limitation is to complywith § 63.487(f)(1) or (g)(1).

(ii) Identification that the batch cyclelimitation is based on a single worst-case HAP emitting product or on theexpected mix of products for the batchfront-end process vent as allowed under§ 63.488(a)(1).

(iii) Definition of the operating year,for the purposes of determiningcompliance with the batch cyclelimitation.

(iv) If the batch cycle limitation isbased on a single worst-case HAPemitting product, documentationspecified in § 63.488(a)(1)(ii) describinghow the single product meets therequirements for worst-case HAPemitting product, as specified in§ 63.488(a)(1) and the number of batchcycles allowed under the batch cyclelimitation for each product associatedwith the batch front-end process ventare required.

(v) If the batch cycle limitation isbased on the expected mix of products,the owner or operator shall providedocumentation that describes as manyscenarios for differing mixes of products(i.e., how many of each type of product)that the owner or operator desires theflexibility to accomplish. Alternatively,the owner or operator shall provide adescription of the relationship amongthe mix of products that will allow adetermination of compliance with thebatch cycle limitation under an infinitenumber of scenarios. For example, if abatch process vent has two products,each product has the same flow rate andemits for the same amount of time, andproduct No. 1 has twice the emissionsas product No. 2, the relationshipdescribing an infinite number ofscenarios would be that the owner oroperator can accomplish two batchcycles of product No. 2 for each batchcycle of product No. 1 within therestriction of the batch cycle limitation.

§ 63.491 Batch front-end process vents—recordkeeping requirements.

(a) Group determination records forbatch front-end process vents. Except asprovided in paragraphs (a)(7) through(a)(9) of this section, each owner oroperator of an affected source shallmaintain the records specified inparagraphs (a)(1) through (a)(6) of thissection for each batch front-end processvent subject to the group determinationprocedures of § 63.488. Except forparagraph (a)(1) of this section, therecords required to be maintained bythis paragraph are limited to theinformation developed and used tomake the group determination under§ 63.488(b) through § 63.488(g), asappropriate. The information requiredby paragraph (a)(1) of this section isrequired for all batch front-end processvents subject to the group determinationprocedures of § 63.488. If an owner oroperator did not need to develop certaininformation (e.g., annual average flowrate) to determine the group status, thisparagraph does not require thatadditional information be developed.

(1) An identification of each uniqueproduct that has emissions from one ormore batch emission episodes ventingfrom the batch front-end process vent.

(2) A description of, and an emissionestimate for, each batch emissionepisode, and the total emissionsassociated with one batch cycle for eachunique product identified in paragraph(a)(1) of this section that was consideredin making the group determinationunder § 63.488.

(3) Total annual uncontrolled TOC ororganic HAP emissions, determined atthe exit from the batch unit operationbefore any emission control, asdetermined in accordance with§ 63.488(b).

(i) For Group 2 batch front-endprocess vents, emissions shall bedetermined at the batch cycle limitation.

(ii) For Group 1 batch front-endprocess vents, emissions shall be thoseused to determine the group status ofthe batch front-end process vent.

(4) The annual average flow rate forthe batch front-end process vent asdetermined in accordance with§ 63.488(e).

(5) The cutoff flow rate, determined inaccordance with § 63.488(f).

(6) The results of the batch front-endprocess vent group determination,conducted in accordance with§ 63.488(g).

(7) If a batch front-end process vent isin compliance with § 63.487(a) or§ 63.487(b), and the control device isoperating at all times when batchemission episodes are venting from thebatch front-end process vent, none of

the records in paragraphs (a)(1) through(a)(6) of this section are required.

(8) If a batch front-end process vent isin compliance with § 63.487(a) or§ 63.487(b), but the control device isoperated only during selected batchemission episodes, only the records inparagraphs (a)(1) through (a)(3) of thissection are required.

(9) If the total annual emissions fromthe batch front-end process vent are lessthan the appropriate level specified in§ 63.488(d), only the records inparagraphs (a)(1) through (a)(3) of thissection are required.

(b) Compliance demonstrationrecords. Each owner or operator of abatch front-end process vent oraggregate batch vent stream complyingwith § 63.487(a) or (b), shall keep thefollowing records, as applicable, up-to-date and readily accessible:

(1) The annual mass emissions ofhalogen atoms in the batch front-endprocess vent or aggregate batch ventstream determined according to theprocedures specified in § 63.488(h)(2).

(2) If a batch front-end process vent isin compliance with § 63.487(a)(2),records documenting the batch cyclepercent reduction as specified in§ 62.486–4(c)(2).

(3) When using a flare to comply with§ 63.487(a)(1):

(i) The flare design (i.e., steam-assisted, air-assisted, or non-assisted);

(ii) All visible emission readings, heatcontent determinations, flow ratemeasurements, and exit velocitydeterminations made during thecompliance determination required by§ 63.11(b) of subpart A; and

(iii) All periods during thecompliance determination required by§ 63.11(b) of subpart A when the pilotflame is absent.

(4) The following information whenusing a control device to achievecompliance with § 63.487(a)(2) or (b)(2):

(i) For an incinerator or non-combustion control device, the percentreduction of organic HAP or TOCachieved, as determined using theprocedures specified in § 63.490(c) forbatch front-end process vents and§ 63.490(e) for aggregate batch ventstreams;

(ii) For a boiler or process heater, adescription of the location at which thevent stream is introduced into the boileror process heater;

(iii) For a boiler or process heater witha design heat input capacity of less than44 megawatts and where the processvent stream is introduced withcombustion air or is used as a secondaryfuel and is not mixed with the primaryfuel, the percent reduction of organicHAP or TOC achieved, as determined


using the procedures specified in§ 63.490(c) for batch front-end processvents and § 63.490(e) for aggregate batchvent streams; and

(iv) For a scrubber or other controldevice following a combustion device tocontrol a halogenated batch front-endprocess vent or halogenated aggregatebatch vent stream, the percent reductionof total hydrogen halides and halogens,as determined under § 63.490(d)(3) orthe emission limit determined under§ 63.490(d)(4).

(c) Establishment of parametermonitoring level records. For eachparameter monitored according to§ 63.489(b) and Table 6 of this subpart,or for alternate parameters and/orparameters for alternate control devicesmonitored according to § 63.492(e) asallowed under § 63.489(c), maintaindocumentation showing theestablishment of the level that indicatesproper operation of the control device asrequired by § 63.489(e) for parametersspecified in § 63.489(b) and as requiredby § 63.506(f) for alternate parameters.This documentation shall include theparameter monitoring data used toestablish the level.

(d) Group 2 batch front-end processvent continuous compliance records.The owner or operator of a Group 2batch front-end process vent shallcomply with either paragraph (d)(1) or(d)(2) of this section, as appropriate.

(1) The owner or operator of a Group2 batch front-end process ventcomplying with § 63.487(g) shall keepthe following records up-to-date andreadily accessible:

(i) Records designating the establishedbatch cycle limitation required by§ 63.487(g)(1) and specified in§ 63.490(f).

(ii) Records specifying the numberand type of batch cycles accomplished.

(2) The owner or operator of a Group2 batch front-end process ventcomplying with § 63.487(f) shall keepthe following records up-to-date andreadily accessible:

(i) Records designating the establishedbatch cycle limitation required by§ 63.487(f)(1) and specified in§ 63.490(f).

(ii) Records specifying the numberand type of batch cycles accomplishedfor each three month period.

(e) Controlled batch front-end processvent continuous compliance records.Each owner or operator of a batch front-end process vent that uses a controldevice to comply with § 63.487(a) shallkeep the following records up-to-dateand readily accessible:

(1) Continuous records of theequipment operating parametersspecified to be monitored under

§ 63.489(b) as applicable, and listed inTable 6 of this subpart, or specified bythe Administrator in accordance with§ 63.492(e) as allowed under § 63.489(c).These records shall be kept as specifiedunder § 63.506(d), except as specified inparagraphs (e)(1)(i) and (e)(1)(ii) of thissection.

(i) For flares, the records specified inTable 6 of this subpart shall be keptrather than averages.

(ii) For carbon adsorbers, the recordsspecified in Table 6 of this subpart shallbe kept rather than averages.

(2) Records of the batch cycle dailyaverage value of each continuouslymonitored parameter, except asprovided in paragraphs (e)(2)(iii) of thissection, as calculated using theprocedures specified in paragraphs(e)(2)(i) through (e)(2)(ii) of this section.

(i) The batch cycle daily average shallbe calculated as the average of allparameter values measured during thosebatch emission episodes, or portionsthereof, in the batch cycle that theowner or operator has selected tocontrol.

(ii) Monitoring data recorded duringperiods of monitoring systembreakdowns, repairs, calibration checks,and zero (low-level) and high-leveladjustments shall not be included incomputing the batch cycle dailyaverages.

(iii) If all recorded values for amonitored parameter during anoperating day are above the minimum orbelow the maximum level established inaccordance with § 63.489(e), the owneror operator may record that all valueswere above the minimum or below themaximum level established, rather thancalculating and recording a batch cycledaily average for that operating day.

(3) Hourly records of whether the flowindicator for bypass lines specifiedunder § 63.489(d)(1) was operating andwhether flow was detected at any timeduring the hour. Also, records of thetimes and durations of all periods whenthe vent is diverted from the controldevice, or the flow indicator specified in§ 63.489(d)(1) is not operating.

(4) Where a seal or closuremechanism is used to comply with§ 63.489(d)(2) or where computermonitoring of the position of the bypassdamper or valve is used to comply with§ 63.489(d)(3), hourly records of floware not required.

(i) For compliance with § 63.489(d)(2),the owner or operator shall recordwhether the monthly visual inspectionof the seals or closure mechanism hasbeen done, and shall record theoccurrence of all periods when the sealmechanism is broken, the bypass linevalve position has changed, or the key

for a lock-and-key type configurationhas been checked out, and records ofany car-seal that has been broken.

(ii) For compliance with§ 63.489(d)(3), the owner or operatorshall record the times of all periodswhen the bypass line valve position haschanged.

(5) Records specifying the times andduration of periods of monitoringsystem breakdowns, repairs, calibrationchecks, and zero (low-level) and highlevel adjustments. In addition, recordsspecifying any other periods of processor control device operation whenmonitors are not operating.

(f) Aggregate batch vent streamcontinuous compliance records. Inaddition to the records specified inparagraphs (b) and (c) of this section,each owner or operator of an aggregatebatch vent stream using a control deviceto comply with § 63.487(b) shall keeprecords in accordance with therequirements for continuous processvents in § 63.118(a) and § 63.118(b) ofsubpart G, as applicable andappropriate, except that whencomplying with § 63.118(b), owners oroperators shall disregard statementsconcerning TRE index values for thepurposes of this subpart.

§ 63.492 Batch front-end process vents—reporting requirements.

(a) The owner or operator of a batchfront-end process vent at an affectedsource shall submit the informationspecified in paragraphs (a)(1) through(a)(4) of this section, as appropriate, aspart of the Notification of ComplianceStatus specified in § 63.506(e)(5).

(1) For each batch front-end processvent complying with § 63.487(a) andeach aggregate batch vent streamcomplying with § 63.487(b), theinformation specified in § 63.491(b) and§ 63.491(c), as applicable.

(2) For each Group 2 batch front-endprocess vent with annual emissions lessthan the level specified in § 63.488(d),the information specified in§ 63.491(d)(1)(i).

(3) For each Group 2 batch front-endprocess vent with annual emissionsgreater than or equal to the levelspecified in § 63.488(d), the informationspecified in § 63.491(d)(2)(i).

(4) For each batch process ventsubject to the group determinationprocedures, the information specified in§ 63.491(a), as appropriate.

(b) Whenever a process change, asdefined in § 63.488(i)(1), is made thatcauses a Group 2 batch front-endprocess vent to become a Group 1 batchfront-end process vent, the owner oroperator shall submit a report within180 operating days after the process


change is made or the informationregarding the process change is knownto the owner or operator. This reportmay be included in the next PeriodicReport, as specified in§ 63.506(e)(6)(iii)(D)(2). The followinginformation shall be submitted:

(1) A description of the processchange; and

(2) A schedule for compliance withthe provisions of § 63.487(a) or§ 63.487(b), as appropriate, as requiredunder § 63.506(e)(6)(iii)(D)(2).

(c) Whenever a process change, asdefined in § 63.488(i)(1), is made thatcauses a Group 2 batch front-endprocess vent with annual emissions lessthan the level specified in § 63.488(d)that is in compliance with § 63.487(g) tohave annual emissions greater than orequal to the levels specified in§ 63.488(d) but remains a Group 2 batchfront-end process vent, the owner oroperator shall submit a report within180 operating days after the processchange is made or the informationregarding the process change is knownto the owner or operator. This reportmay be included in the next PeriodicReport, as specified in§ 63.506(e)(6)(iii)(D)(2). The followinginformation shall be submitted:

(1) A description of the processchange;

(2) The results of the redeterminationof the annual emissions, average flowrate, and cutoff flow rate required under§ 63.488(f) and recorded under § 63.491(a)(3) through (a)(5); and

(3) The batch cycle limitationdetermined in accordance with§ 63.487(f)(1).

(d) The owner or operator is notrequired to submit a report of a processchange if one of the conditions specifiedin paragraphs (d)(1) and (d)(2) of thissection is met.

(1) The process change does not meetthe description of a process change in§ 63.488(i).

(2) The redetermined group statusremains Group 2 for an individual batchfront-end process vent with annualemissions greater than or equal to thelevel specified in § 63.488(d), or a Group2 batch front-end process vent withannual emissions less than the levelspecified in § 63.488(d) complying with§ 63.487(g) continues to have emissionsless than the level specified in§ 63.488(d).

(e) If an owner or operator uses acontrol device other than thosespecified in § 63.489(b) and listed inTable 6 of this subpart or requestsapproval to monitor a parameter otherthan those specified in § 63.489(c) andlisted in Table 6 of this subpart, theowner or operator shall submit a

description of planned reporting andrecordkeeping procedures, as specifiedin § 63.506(f), as part of thePrecompliance Report as required under§ 63.506(e)(3). The Administrator willspecify appropriate reporting andrecordkeeping requirements as part ofthe review of the Precompliance Report.

(f) Owners or operators complyingwith § 63.489(d), shall comply withparagraph (f)(1) or (f)(2) of this section,as appropriate.

(1) Reports of the times of all periodsrecorded under § 63.491(e)(3) when thebatch front-end process vent is divertedaway from the control device through abypass line.

(2) Reports of all occurrencesrecorded under § 63.491(e)(4) in whichthe seal mechanism is broken, thebypass line valve position has changed,or the key to unlock the bypass linevalve was checked out.

§ 63.493 Back-end process provisions.Owners and operators of new and

existing affected sources shall complywith the requirements in § 63.494through § 63.500. Owners and operatorsof affected sources that produce onlylatex products, liquid rubber products,or products in a gas-phasedpolymerization reaction are not subjectto the provisions of these sections.Section 63.494 contains residual organicHAP limitations. Compliance with theseresidual organic HAP limitations may beachieved by using either strippingtechnology, or by using control orrecovery devices. If compliance withthese limitations is achieved usingstripping technology, the procedures todetermine compliance are specified in§ 63.495. If compliance with theselimitations is achieved using control orrecovery devices, the procedures todetermine compliance are specified in§ 63.496, and associated monitoringrequirements are specified in § 63.497.Recordkeeping requirements arecontained in § 63.498, and reportingrequirements in § 63.499. Section 63.500contains a limitation on carbondisulfide emissions from affectedsources that produce styrene butadienerubber using an emulsion process. Table8 contains a summary of compliancealternative requirements for thesesections.

§ 63.494 Back-end process provisions—residual organic HAP limitations.

(a) The monthly weighted averageresidual organic HAP content of allgrades of elastomer processed, measuredimmediately after the strippingoperation [or the reactor(s) if the planthas no stripper(s)] is completed, shallnot exceed the limits provided in

paragraphs (a)(1) through (a)(4) of thissection, as applicable. Owners oroperators shall comply with therequirements of this paragraph usingeither stripping technology or control/recovery devices.

(1) For styrene butadiene rubberproduced by the emulsion process:

(i) A monthly weighted average of0.40 kg styrene per megagram (Mg) latexfor existing sources; and

(ii) A monthly weighted average of0.23 kg styrene per Mg latex for newsources;

(2) For polybutadiene rubber andstyrene butadiene rubber produced bythe solution process:

(i) A monthly weighted average of 10kg total organic HAP per Mg crumbrubber (dry weight) for existing sources;and

(ii) A monthly weighted average of 6kg total organic HAP per Mg crumbrubber (dry weight) for new sources.

(3) For ethylene-propylene rubberproduced by the solution process:

(i) A monthly weighted average of 8kg total organic HAP per Mg crumbrubber (dry weight) for existing sources;and

(ii) A monthly weighted average of 5kg total organic HAP per Mg crumbrubber (dry weight) for new sources.

(4) There are no back-end processoperation residual organic HAPlimitations for neoprene, Hypalon TM,nitrile butadiene rubber, butyl rubber,halobutyl rubber, epichlorohydrinelastomer, and polysulfide rubber.

(5) For EPPU that produce both anelastomer product with a residualorganic HAP limitation listed in thissection, and a product listed inparagraphs (a)(5) (i) through (iv) of thissection, only the residual HAP contentof the elastomer product with a residualorganic HAP limitation shall be used indetermining the monthly averageresidual organic HAP content.

(i) Resins;(ii) Liquid rubber products;(iii) Latexes from which crumb rubber

is not coagulated; or(iii) Elastomer products listed in

paragraph (a)(4) of this section.(b) If an owner or operator complies

with the residual organic HAPlimitations in paragraph (a) of thissection using stripping technology,compliance shall be demonstrated inaccordance with § 63.495. The owner oroperator shall also comply with therecordkeeping provisions in § 63.498,and the reporting provisions in § 63.499.

(c) If an owner or operator complieswith the residual organic HAPlimitations in paragraph (a) of thissection using control or recoverydevices, compliance shall be


demonstrated using the procedures in§ 63.496. The owner or operator shallalso comply with the monitoringprovisions in § 63.497, therecordkeeping provisions in § 63.498,and the reporting provisions in § 63.499.

§ 63.495 Back-end process provisions—procedures to determine compliance usingstripping technology.

(a) If an owner or operator complieswith the residual organic HAPlimitations in § 63.494(a) using strippingtechnology, compliance shall bedemonstrated using the periodicsampling procedures in paragraph (b) ofthis section, or using the stripperparameter monitoring procedures inparagraph (c) of this section. The owneror operator shall determine the monthlyweighted average residual organic HAPcontent for each month in which anyportion of the back-end of an elastomerproduction process is in operation. Asingle monthly weighted average shallbe determined for all back-end processoperations at the affected source.

(b) If the owner or operator isdemonstrating compliance usingperiodic sampling, this demonstrationshall be in accordance with paragraphs(b)(1) through (b)(5) of this section,

(1) The location of the sampling shallbe in accordance with paragraph (d) ofthis section.

(2) The frequency of the samplingshall be in accordance with paragraphs(b)(2)(i) or (b)(2)(ii) of this section.

(i) If batch stripping is used, at leastone representative sample is to be takenfrom every batch of elastomer produced,at the location specified in paragraph (d)of this section, and identified byelastomer type and by the date and timethe batch is completed.

(ii) If continuous stripping is used, atleast one representative sample is to betaken each operating day. The sample isto be taken at the location specified inparagraph (d) of this section, andidentified by elastomer type and by thedate and time the sample was taken.

(3) The residual organic HAP contentin each sample is to be determinedusing specified methods.

(4) The quantity of material (weight oflatex or dry crumb rubber) representedby each sample shall be recorded.Acceptable methods of determining thisquantity are production records,measurement of stream characteristics,and engineering calculations.

(5) The monthly weighted averageshall be determined using the equationin paragraph (f) of this section. Allsamples taken and analyzed during themonth shall be used in thedetermination of the monthly weightedaverage.

(c) If the owner or operator isdemonstrating compliance usingstripper parameter monitoring, thisdemonstration shall be in accordancewith paragraphs (c)(1) through (c)(4) ofthis section.

(1) The owner or operator shallestablish stripper operating parameterlevels for each grade in accordance with§ 63.505(e).

(2) The owner or operator shallmonitor the stripper operatingparameters at all times the stripper is inoperation. Readings of each parametershall be made at intervals no greaterthan 15 minutes.

(3) The residual organic HAP contentfor each grade shall be determined inaccordance with either paragraph(c)(3)(i) or (c)(3)(ii) of this section.

(i) If during the processing of a gradein the stripper, all hourly averageparameter values are in accordance withoperating parameter levels establishedin paragraph (c)(1) of this section, theowner or operator shall use the residualorganic HAP content determined inaccordance with § 63.505(e)(1).

(ii) If during the processing of a gradein the stripper, the hourly average ofany stripper monitoring parameter is notin accordance with an establishedoperating parameter level, the residualorganic HAP content shall bedetermined using the procedures inparagraphs (b)(1) and (b)(3) of thissection.

(4) The monthly weighted averageshall be determined using the equationin paragraph (f) of this section.

(d) The location of the sampling shallbe in accordance with paragraph (d)(1)or (d)(2) of this section.

(1) For styrene butadiene rubberproduced by the emulsion process, thesample shall be a sample of the latextaken at the location specified in eitherparagraph (d)(1)(i), (d)(1)(ii), or(d)(1)(iii) of this section.

(i) When the latex is not blended withother materials or latexes, the sampleshall be taken at a location meeting allof the following criteria:

(A) After the stripping operation,(B) Prior to entering the coagulation

operations, and(C) Before the addition of carbon

black or oil extenders.(ii) When two or more latexes subject

to this subpart are blended, samplesmay be taken in accordance with eitherparagraph (d)(1)(ii) (A) or (B) of thissection, at a location meeting therequirements of paragraphs (d)(1)(i) (A)through (C) of this section.

(A) Individual samples may be takenof each latex prior to blending, or

(B) A sample of the blended latex maybe taken.

(iii) When a latex subject to thissubpart is blended with a latex ormaterial not subject to this subpart, asample shall be taken of the latex priorto blending at a location meeting therequirements of paragraphs (d)(1)(i) (A)through (C) of this section.

(2) For styrene butadiene rubberproduced by the solution process,polybutadiene rubber produced by thesolution process, and ethylene-propylene rubber produced by thesolution process, the sample shall be asample of crumb rubber taken as soonas safe and feasible after the strippingoperation, but no later than the entrypoint for the first unit operationfollowing the stripper (e.g., thedewatering screen).

(e) Reserved.(f) The monthly weighted average

residual organic HAP content shall becalculated using Equation 26.

HAPCONT

C P

Pavg wk

i ii

n

wk, =

( )( )=∑

1 [Eq. 26]

where:HAPCONTavg,wk = Monthly weighted

average organic HAP content for allrubber processed at the affectedsource, kg organic HAP per Mglatex or dry crumb rubber.

n = Number of samples in the month.Ci = Residual organic HAP content of

sample i, determined in accordancewith (b)(3) or (c)(3) of this section,kg organic HAP per Mg latex or drycrumb rubber.

Pi = Weight of latex or dry crumb rubberrepresented by sample i.

Pwk = Weight of latex or dry crumbrubber (Mg) processed in themonth.

§ 63.496 Back-end process provisions—procedures to determine compliance usingcontrol or recovery devices.

(a) If an owner or operator complieswith the residual organic HAPlimitations in § 63.494(a) using controlor recovery devices, compliance shall bedemonstrated using the procedures inparagraphs (b) and (c) of this section.Previous test results conducted inaccordance with paragraphs (b)(1)through (b)(6) of this section may beused to determine compliance inaccordance with paragraph (c) of thissection.

(b) Compliance shall be demonstratedusing the provisions in paragraphs (b)(1)through (b)(10) of this section, asapplicable.

(1) A test shall be conducted, theduration of which shall be inaccordance with either paragraph


(b)(1)(i) or (b)(1)(ii) of this section, asappropriate.

(i) If the back-end process operationsare continuous, the test shall consist ofthree separate one hour runs.

(ii) If the back-end process operationsare batch, the test shall consist of threeseparate one-hour runs, unless theduration of the batch cycle is less thanone-hour, in which case the run lengthshall equal the complete duration of theback-end process batch cycle.

(2) The test shall be conducted whenthe grade of elastomer product with thehighest residual organic HAP contentleaving the stripper is processed in theback-end operations.

(3) The uncontrolled residual organicHAP content in the latex or dry crumbrubber shall be determined inaccordance with § 63.495(b)(1) and(b)(3). A separate sample shall be takenand analyzed for each test run. Thesample shall be representative of thematerial being processed in the back-end operation during the test, and doesnot need to be taken during the test.

(4) The quantity of material (weight oflatex or dry crumb rubber) processedduring the test run shall be recorded.Acceptable methods of determining thisquantity are production records,measurement of stream characteristics,and engineering calculations.

(5) The inlet and outlet emissionsfrom the control or recovery device shallbe determined using the procedures inparagraphs (b)(5)(i) through (b)(5)(v) ofthis section, with the exceptions notedin paragraphs (b)(6) and (b)(7) of thissection. The inlet and outlet emissionsshall be determined when the materialfor which the uncontrolled residualorganic HAP content is determined inaccordance with paragraph (b)(3) of thissection, is being processed in theequipment controlled by the control orrecovery device.

(i) Method 1 or 1A of 40 CFR part 60,appendix A, as appropriate, shall beused for selection of the sampling sites.Sampling sites shall be located at theinlet of the control or recovery device asspecified in paragraphs (b)(5)(i)(A) or(b)(5)(i)(B) of this section, and at theoutlet of the control or recovery device.

(A) The inlet sampling site shall belocated at the exit of the back-endprocess unit operation before anyopportunity for emission to the

atmosphere, and before any control orrecovery device.

(B) If back-end process vent streamsare combined prior to being routed tocontrol or recovery devices, the inletsampling site may be for the combinedstream, as long as there is noopportunity for emission to theatmosphere from any of the streamsprior to being combined.

(ii) The gas volumetric flow rate shallbe determined using Method 2, 2A, 2C,or 2D of 40 CFR part 60, appendix A,as appropriate.

(iii) To determine the inlet and outlettotal organic HAP concentrations, theowner or operator shall use Method 18or Method 25A of 40 CFR part 60,appendix A. Alternatively, any othermethod or data that has been validatedaccording to the applicable proceduresin Method 301 of appendix A may beused. The minimum sampling time foreach run shall be in accordance withparagraph (b)(1) of this section, duringwhich either an integrated sample orgrab samples shall be taken. If grabsampling is used, then the samples shallbe taken at approximately equalintervals during the run, with the timebetween samples no greater than 15minutes.

(iv) The mass rate of total organicHAP shall be computed using Equations27 and 28.

E K C Q

E K C Q

i ijj

n

i

o ojj

n

o

=

=

=

=

∑

∑

21

21

M [Eq. 27]

M [Eq. 28]

ij

oj

where:Cij, Coj=Concentration of sample

component j of the gas stream at theinlet and outlet of the control orrecovery device, respectively, drybasis, ppmv.

Ei, Eo=Mass rate of total organic HAP atthe inlet and outlet of the control orrecovery device, respectively, drybasis, kg per hour (kg/hr).

Mij, Moj=Molecular weight of samplecomponent j of the gas stream at theinlet and outlet of the control orrecovery device, respectively, gm/gm-mole.

Qi, Qo=Flow rate of gas stream at theinlet and outlet of the control or

recovery device, respectively, drystandard m3/min.

K2=Constant, 2.494 × 10¥6 (ppmv)¥1


(v) Inlet and outlet organic HAPemissions for the run shall be calculatedby multiplying the mass rate total inletand outlet emissions determined inaccordance with paragraph (b)(5)(iv) ofthis section by the duration of the run(in hours).

(6) If a back-end process vent streamis introduced with the combustion air,or as a secondary fuel into a boiler orprocess heater with a design capacityless than 44 megawatts, the inlet andoutlet emissions shall be determined inaccordance with paragraphs (b)(6)(i)through (b)(6)(iv) of this section.

(i) The inlet organic HAP emissionsfor the back-end process unit operationshall be determined in accordance withparagraph (b)(5) of this section.

(ii) The owner or operator shall alsomeasure total organic HAP (or TOC,minus methane and ethane) emissionsin all process vent streams and primaryand secondary fuels introduced into theboiler or process heater, using theprocedures in paragraph (b)(5) of thissection, with the exceptions noted inparagraphs (b)(6)(ii)(A) through(b)(6)(ii)(C) of this section.

(A) Selection of the location of theinlet sampling sites shall ensure themeasurement of total organic HAPconcentrations in all process ventstreams and primary and secondaryfuels introduced into the boiler orprocess heater.

(B) Paragraph (b)(5)(iii) of this sectionis applicable, except that TOC (minusmethane and ethane) may be measuredinstead of total organic HAP.

(C) The mass rates shall be calculatedin accordance with paragraph (b)(5)(iv)of this section, except that Cj at the inletand outlet of the control device shall bethe sum of all total organic HAP (orTOC, minus methane and ethane)concentrations for all process ventstreams and primary and secondaryfuels introduced into the boiler orprocess heater.

(iii) The control efficiency of theboiler or process heater shall becalculated using Equation 29.

R

E E

E

Eqinlet

i

n

outleti

n

inleti

n

i i

i

=

−

( ) ( )= =

=

∑ ∑

∑1 1

1

100 29.


where:R=Control efficiency of boiler or process

heater, percent.Einlet=Mass rate of total organic HAP or

TOC (minus methane and ethane)for all process vent streams andprimary and secondary fuels at theinlet to the boiler or process heater,kg organic HAP/hr or kg TOC/hr.

Eoutlet=Mass rate of total organic HAP orTOC (minus methane and ethane)for all process vent streams andprimary and secondary fuels at theoutlet to the boiler or processheater, kg organic HAP/hr or kgTOC/hr.

(iv) The outlet total organic HAPemissions associated with the back-endprocess unit operation shall becalculated using the equation inparagraph (b)(8) of this section.

(7) An owner or operator is notrequired to conduct a source test todetermine the outlet organic HAPemissions if any control devicespecified in paragraphs (b)(7)(i) through(b)(7)(v) of this section is used. For thesedevices, the inlet emissions associatedwith the back-end process unitoperation shall be determined inaccordance with paragraph (b)(5) of thissection, and the outlet emissions shallbe calculated using the equation inparagraph (b)(8) of this section.

(i) A flare, provided the owner oroperator complies with the flareprovisions in § 63.11(b) of subpart A.The compliance determination requiredby § 63.6(h) of subpart A shall beconducted using Method 22 of 40 CFR

part 60, appendix A, to determinevisible emissions. Compliancedeterminations are not necessary forflares already deemed to be incompliance with the flare provisions in§ 63.11(b) of subpart A.

(ii) A boiler or process heater with adesign heat input capacity of 44megawatts or greater.

(iii) A boiler or process heater intowhich the process vent stream isintroduced with the primary fuel or isused as the primary fuel.

(iv) A control device for which aperformance test was conducted fordetermining compliance with an NSPSand the test was conducted using thesame procedures specified in thissection and no process changes havebeen made since the test.

(v) A boiler or process heater burninghazardous waste for which the owner oroperator:

(A) Has been issued a final permitunder 40 CFR part 270 and complieswith the requirements of 40 CFR part266, subpart H, or

(B) Has certified compliance with theinterim status requirements of 40 CFRpart 266, subpart H.

(8) If one of the control devices listedin paragraph (b)(6) or (b)(7) of thissection is used, the outlet emissionsshall be calculated using Equation 30.

E E R Eqo i= −( ) [ ]1 30.

where:Eo=Mass rate of total organic HAP at the

outlet of the control or recovery

device, respectively, dry basis, kg/hr.

Ei=Mass rate of total organic HAP at theinlet of the control or recoverydevice, respectively, dry basis, kg/hr, determined using theprocedures in paragraph (b)(5)(iv) ofthis section.

R=Control efficiency of control device,as specified in paragraph (b)(8) (i),(ii), or (iii) of this section.

(i) If a back-end process vent streamis introduced with the combustion air,or as a secondary fuel into a boiler orprocess heater with a design capacityless than 44 megawatts, the controlefficiency of the boiler or process heatershall be determined using theprocedures in paragraph (b)(6)(iii) ofthis section.

(ii) If a back-end process vent iscontrolled using a control devicespecified in paragraph (b)(7) (i), (ii), (iii),or (v) of this section, the control deviceefficiency shall be assumed to be 98percent.

(iii) If a back-end process vent iscontrolled using a control devicespecified in paragraph (b)(7)(iv) of thissection, the control device efficiencyshall be the efficiency determined in theprevious performance test.

(c) Compliance shall be determinedusing the procedures in this paragraph.

(1) For each test run, the residualorganic HAP content, adjusted for thecontrol or recovery device emissionreduction, shall be calculated usingEquation 31.Where:

HAPCONTC P E E

PEqrun

i run o run=( )( ) − ( ) + ( )

( )[ ], ,

. 31

HAPCONTrun=Factor, kg organic HAPper kg elastomer (latex or dry crumbrubber).

C=Total uncontrolled organic HAPcontent, determined in accordancewith paragraph (b)(3) of thissection, kg organic HAP per kg latexor dry crumb rubber.

P=Weight of latex or dry crumb rubberprocessed during test run.

Ei,run=Mass rate of total organic HAP atthe inlet of the control or recoverydevice, respectively, dry basis, kgper test run.

Eo,run=Mass rate of total organic HAP atthe outlet of the control or recoverydevice, respectively, dry basis, kgper test run.

(2) A facility is in compliance if theaverage of the organic HAP contentscalculated for all three test runs is below

the residual organic HAP limitations in§ 63.494(a).

(d) An owner or operator complyingwith the residual organic HAPlimitations in § 63.494(a) using a controlor recovery device, shall redeterminethe compliance status through therequirements described in paragraph (b)of this section whenever processchanges are made. The owner oroperator shall report the results of theredetermination in accordance with§ 63.499(d). For the purposes of thissection, a process change is any actionthat would reasonably be expected toimpair the performance of the control orrecovery device. For the purposes of thissection, the production of an elastomerwith a residual organic HAP contentgreater than the residual organic HAPcontent of the elastomer used in the

compliance demonstration constitutes aprocess change, unless the overall effectof the change is to reduce organic HAPemissions from the source as a whole.Other examples of process changes mayinclude changes in production capacityor production rate, or removal oraddition of equipment. For the purposesof this paragraph, process changes donot include: Process upsets;unintentional, temporary processchanges; or changes that reduce theresidual organic HAP content of theelastomer.

§ 63.497 Back-end process provisions—monitoring provisions for control andrecovery devices.

(a) An owner or operator complyingwith the residual organic HAPlimitations in § 63.494(a) using control


or recovery devices, or a combination ofstripper technology and control orrecovery devices, shall install themonitoring equipment specified inparagraphs (a)(1) through (a)(6) of thissection, as appropriate.

(1) Where an incinerator is used, atemperature monitoring deviceequipped with a continuous recorder isrequired.

(i) Where an incinerator other than acatalytic incinerator is used, thetemperature monitoring device shall beinstalled in the firebox or in theductwork immediately downstream ofthe firebox in a position before anysubstantial heat exchange occurs.

(ii) Where a catalytic incinerator isused, the temperature monitoringdevices shall be installed in the gasstream immediately before and after thecatalyst bed.

(2) Where a flare is used, a device(including, but not limited to, athermocouple, ultra-violet beam sensor,or infrared sensor) capable ofcontinuously detecting the presence of apilot flame is required.

(3) Where a boiler or process heater ofless than 44 megawatts design heatinput capacity is used, a temperaturemonitoring device in the fireboxequipped with a continuous recorder isrequired. Any boiler or process heater inwhich all vent streams are introducedwith primary fuel or are used as theprimary fuel is exempt from thisrequirement.

(4) For an absorber, a scrubbing liquidtemperature monitoring device and aspecific gravity monitoring device arerequired, each equipped with acontinuous recorder.

(5) For a condenser, a condenser exit(product side) temperature monitoringdevice equipped with a continuousrecorder is required.

(6) For a carbon adsorber, anintegrating regeneration stream flowmonitoring device having an accuracy ofat least ±10 percent, capable of recordingthe total regeneration stream flow foreach regeneration cycle; and a carbonbed temperature monitoring device,capable of recording the carbon bedtemperature after each regeneration andwithin 15 minutes of completing anycooling cycle are required.

(b) An owner or operator may requestapproval to monitor parameters otherthan those required by paragraph (a) ofthis section. The request shall besubmitted according to the proceduresspecified in § 63.506(f) or (g). Approvalshall be requested if the owner oroperator:

(1) Uses a control or recovery deviceother than those listed in paragraph (a)of this section; or

(2) Uses one of the control or recoverydevices listed in paragraph (a) of thissection, but seeks to monitor aparameter other than those specified inparagraph (a) of this section.

(c) The owner or operator shallestablish a level, defined as either amaximum or minimum operatingparameter, that indicates properoperation of the control or recoverydevice for each parameter monitoredunder paragraphs (a)(1) through (a)(6) ofthis section. This level is determined inaccordance with § 63.505. Theestablished level, along with supportingdocumentation, shall be submitted inthe Notification of Compliance Status orthe operating permit application, asrequired in § 63.506 (e)(5) or (e)(8),respectively. The owner or operatorshall operate control and recoverydevices above or below the establishedlevel, as required, to ensure continuedcompliance with the standard.

(d) The owner or operator of acontrolled back-end process vent usinga vent system that contains bypass linesthat could divert a vent stream awayfrom the control or recovery device usedto comply with § 63.494(a) shall complywith paragraph (d)(1), (d)(2), or (d)(3) ofthis section. Equipment such as low legdrains, high point bleeds, analyzervents, open-ended valves or lines, andpressure relief valves needed for safetypurposes are not subject to thisparagraph.

(1) Properly install, maintain, andoperate a flow indicator that takes areading at least once every 15 minutes.Records shall be generated as specifiedin § 63.498(d)(5)(iii). The flow indicatorshall be installed at the entrance to anybypass line that could divert the ventstream away from the control device tothe atmosphere; or

(2) Secure the bypass line valve in thenon-diverting position with a car-seal ora lock-and-key type configuration. Avisual inspection of the seal or closuremechanism shall be performed at leastonce every month to ensure that thevalve is maintained in the non-divertingposition and the vent stream is notdiverted through the bypass line.

(3) Continuously monitor the bypassline damper or valve position usingcomputer monitoring and record anyperiods when the position of the bypassline valve has changes as specified in§ 63.498(d)(5)(iv).

§ 63.498 Back-end process provisions—recordkeeping.

(a) Each owner or operator shallmaintain the records specified inparagraphs (a)(1) through (a)(3) of thissection for each back-end processoperation at an affected source.

(1) The type of elastomer productprocessed in the back-end operation.

(2) The type of process (solutionprocess, emulsion process, etc.)

(3) If the back-end process operationis subject to an emission limitation in§ 63.494(a), whether compliance will beachieved by stripping technology, or bycontrol or recovery devices.

(b) Each owner or operator of a back-end process operation using strippingtechnology to comply with an emissionlimitation in § 63.494(a), anddemonstrating compliance using theperiodic sampling procedures in§ 63.495(b), shall maintain the recordsspecified in paragraph (b)(1), and inparagraph (b)(2) or (b)(3) of this section,as appropriate.

(1) Records associated with eachsample taken in accordance with§ 63.495(b). These records shall includethe following for each sample:

(i) Elastomer type,(ii) The date and time the sample was

collected,(iii) The corresponding quantity of

elastomer processed over the timeperiod represented by the sample.Acceptable methods of determining thisquantity are production records,measurement of stream characteristics,and engineering calculations.

(A) For emulsion processes, thisquantity shall be the weight of the latexleaving the stripper.

(B) For solution processes, thisquantity shall be the crumb rubber dryweight of the rubber leaving thestripper.

(iv) The organic HAP content of eachsample.

(2) The monthly weighted averageorganic HAP content, calculated inaccordance with § 63.495(f).

(3) If the organic HAP contents for allsamples analyzed during a month arebelow the appropriate level in§ 63.494(a), the owner or operator mayrecord that all samples were inaccordance with the residual organicHAP limitations in § 63.494(a), ratherthan calculating and recording amonthly weighted average.

(c) Each owner or operator of a back-end process operation using strippingtechnology to comply with an emissionlimitation in § 63.494(a), anddemonstrating compliance using thestripper parameter monitoringprocedures in § 63.495(c), shallmaintain the records specified inparagraphs (c)(1) through (c)(3) of thissection.

(1) Records associated with the initial,and subsequent, determinations of theorganic HAP content of each grade ofelastomer produced. These records shallinclude the following:


(i) An identification of the elastomertype and grade;

(ii) The results of the residual organicHAP analyses, conducted in accordancewith § 63.505(e)(1);

(iii) The stripper monitoringparameters required to be established in§ 63.495(c)(1).

(iv) If re-determinations are made ofthe organic HAP content, and re-establishment of the stripper monitoringparameters, records of the initialdetermination are no longer required tobe maintained.

(2) Records associated with eachgrade or batch. These records shallinclude the following for each grade orbatch:

(i) Elastomer type and grade;(ii) The quantity of elastomer

processed;(A) For emulsion processes, this

quantity shall be the weight of the latexleaving the stripper.

(B) For solution processes, thisquantity shall be the crumb rubber dryweight of the crumb rubber leaving thestripper.

(iii) The hourly average of all stripperparameter results;

(iv) If one or more hourly averagestripper monitoring parameters is not inaccordance with the established levels,the results of the residual organic HAPanalysis.

(3) The monthly weighted averageorganic HAP content, calculated inaccordance with § 63.495(f).

(d) Each owner or operator of a back-end process operation using control orrecovery devices to comply with anorganic HAP emission limitation in§ 63.494(a) shall maintain the recordsspecified in paragraphs (d)(1) through(d)(5) of this section.

(1) Results of the testing required by§ 63.496(b). These results shall includethe following, for each of the threerequired test runs:

(i) The uncontrolled residual organicHAP content in the latex or dry crumbrubber, as required to be determined by§ 63.496(b)(3), including the test resultsof the analysis;

(ii) The total quantity of material(weight of latex or dry crumb rubber)processed during the test run, recordedin accordance with § 63.496(b)(4),

(iii) The organic HAP emissions at theinlet and outlet of the control orrecovery device, determined inaccordance with § 63.496 (b)(5) through(b)(8), including all test results andcalculations,

(iv) The residual organic HAPcontent, adjusted for the control orrecovery device emission reduction,determined in accordance with§ 63.496(c)(1).

(2) The operating parameter levelestablished in accordance with§ 63.497(c), along with supportingdocumentation.

(3) The following information whenusing a flare:

(i) The flare design (i.e., steam-assisted, air-assisted, or non-assisted);

(ii) All visible emission readings, heatcontent determinations, flow ratemeasurements, and exit velocitydeterminations made during thecompliance determination; and

(iii) All periods during thecompliance determination when thepilot flame is absent.

(4) When using a boiler or processheater, a description of the location atwhich the vent stream is introducedinto the boiler or process heater.

(5) Each owner or operator using acontrol or recovery device shall keep thefollowing records up-to-date and readilyaccessible:

(i) Continuous records of theequipment operating parametersspecified to be monitored under§ 63.497(a) or specified by theAdministrator in accordance with§ 63.497(b). For flares, the hourlyrecords and records of pilot flameoutages shall be maintained in place ofcontinuous records.

(ii) Records of the daily average valueof each continuously monitoredparameter for each operating day, exceptas provided in paragraphs (d)(5)(ii)(D)and (d)(5)(ii)(E) of this section.

(A) The daily average shall becalculated as the average of all valuesfor a monitored parameter recordedduring the operating day, except asprovided in paragraph (d)(5)(ii)(B) ofthis section. The average shall cover a24-hour period if operation iscontinuous, or the number of hours ofoperation per operating day if operationis not continuous.

(B) Monitoring data recorded duringperiods of monitoring systembreakdowns, repairs, calibration checks,and zero (low-level) and high-leveladjustments shall not be included incomputing the hourly or daily averages.Records shall be kept of the times anddurations of all such periods and anyother periods of process or controldevice operation when monitors are notoperating.

(C) The operating day shall be theperiod defined in the operating permitor the Notification of Compliance Statusin § 63.506(e)(8) or (e)(5). It may be frommidnight to midnight or another 24-hour period.

(D) If all recorded values for amonitored parameter during anoperating day are below the maximum,or above the minimum, level established

in the Notification of Compliance Statusin § 63.506(e)(5) or in the operatingpermit, the owner or operator mayrecord that all values were below themaximum or above the minimum level,rather than calculating and recording adaily average for that operating day.

(E) For flares, records of the times andduration of all periods during which thepilot flame is absent shall be kept ratherthan daily averages. The recordsspecified in this paragraph are notrequired during periods when emissionsare not routed to the flare, or duringstartups, shutdowns, or malfunctionswhen the owner or operator complieswith the applicable requirements ofsubpart A of this part, as directed by§ 63.506(b)(1).

(iii) Hourly records of whether theflow indicator specified under§ 63.497(d)(1) was operating andwhether a diversion was detected at anytime during the hour, as well as recordsof the times of all periods when the ventstream is diverted from the controldevice or the flow indicator is notoperating.

(iv) Where a seal mechanism is usedto comply with § 63.497(d)(2), or wherecomputer monitoring of the position ofthe bypass damper or valve is used tocomply with § 63.497(d)(3), hourlyrecords of flow are not required.

(A) For compliance with§ 63.497(d)(2), the owner or operatorshall record whether the monthly visualinspection of the seals or closuremechanisms has been done, and shallrecord instances when the sealmechanism is broken, the bypass linevalve position has changed, or the keyfor a lock-and-key type configurationhas been checked out, and records ofany car-seal that has broken.

(B) For compliance with§ 63.497(d)(3), the owner or operatorshall record the times of all periodswhen the bypass line damper or valveposition has changed.

§ 63.499 Back-end process provisions—reporting.

(a) The owner or operator of anaffected source with back-end processoperations shall submit the informationrequired in § 63.498(a) as part of theNotification of Compliance Statusspecified in § 63.506(e)(5).

(b) Each owner or operator of a back-end process operation using stripping tocomply with an emission limitation in§ 63.494(a), and demonstratingcompliance by stripper parametermonitoring, shall submit reports asspecified in paragraphs (b)(1) and (b)(2)of this section.

(1) As part of the Notification ofCompliance Status specified in


§ 63.506(e)(5), the owner or operatorshall submit the information specifiedin § 63.498(c)(1).

(2) For organic HAP content/strippingmonitoring parameter re-determinations, and the addition of newgrades, the information specified in§ 63.498(c)(1) shall be submitted in thenext periodic report specified in§ 63.506(e)(6).

(c) Each owner or operator of a back-end process operation control orrecovery devices that must comply withan emission limitation in § 63.494(a)shall submit the information specifiedin paragraphs (c)(1) through (c)(3) of thissection as part of the Notification ofCompliance Status specified in§ 63.506(e)(5).

(1) The residual organic HAP content,adjusted for the control or recoverydevice emission reduction, determinedin accordance with § 63.496(c)(1), foreach test run in the compliancedetermination.

(2) The operating parameter levelestablished in accordance with§ 63.497(c), along with supportingdocumentation.

(3) The information specified in§ 63.498(d)(3) regarding flares and§ 63.498(d)(4) regarding boilers andprocess heaters, if applicable.

(d) Whenever a process change, asdefined in § 63.496(d), is made thatcauses the redetermination of thecompliance status for the back-endprocess operations, the owner oroperator shall submit a report within180 calendar days after the processchange as specified in § 63.506(e)(7)(iii).The report shall include:

(1) A description of the processchange;

(2) The results of the redeterminationof the compliance status, determined inaccordance with § 63.496(b), andrecorded in accordance with§ 63.498(d)(1), and

(3) Documentation of the re-establishment of a parameter level forthe control or recovery device, definedas either a maximum or minimumoperating parameter, that indicatesproper operation of the control orrecovery device, in accordance with§ 63.497(c) and recorded in accordancewith § 63.498(d)(2).

(e) If an owner or operator uses acontrol or recovery device other thanthose listed in § 63.497(a) or requestsapproval to monitor a parameter otherthan those specified in § 63.497(a), theowner or operator shall submit adescription of planned reporting andrecordkeeping procedures as requiredunder § 63.506(e)(3) or (e)(8). TheAdministrator will specify appropriatereporting and recordkeeping

requirements as part of the review of thePrecompliance Report or OperatingPermit application.

§ 63.500 Back-end process provisions—carbon disulfide limitations for styrenebutadiene rubber by emulsion processes.

(a) Owners or operators of sourcessubject to this subpart producingstyrene butadiene rubber using anemulsion process shall operate theprocess such that the carbon disulfideconcentration in each crumb dryerexhausts shall not exceed 45 ppmv.

(1) The owner or operator shalldevelop standard operating proceduresfor the addition of sulfur containingshortstop agents to ensure that thelimitation in paragraph (a) of thissection is maintained. There shall be astandard operating procedurerepresenting the production of everygrade of styrene butadiene rubberproduced at the affected source using asulfur containing shortstop agent.

(2) A validation of each standardoperating procedure shall be conductedin accordance with paragraph (c) of thissection, except as provided in paragraph(b) of this section, to demonstratecompliance with the limitation inparagraph (a) of this section.

(3) The owner or operator shalloperate the process in accordance witha validated standard operatingprocedure at all times when styrenebutadiene rubber is being producedusing a sulfur containing shortstopagent. If a standard operating procedureis changed, it must be re-validated.

(4) Records specified in paragraph (d)of this section shall be maintained.

(5) Reports shall be submitted inaccordance with paragraph (e) of thissection.

(b) Crumb dryers that are vented to acombustion device are not subject to theprovisions in this section.

(c) The owner or operator shallvalidate each standard operatingprocedure to determine compliancewith the limitation in paragraph (a) ofthis section using the testing proceduresin paragraph (c)(1) of this section orengineering assessment, as described inparagraph (c)(2) of this section.

(1) The owner or operator shallconduct a performance test using theprocedures in paragraphs (c)(1)(i)through (c)(1)(iii) of this section todemonstrate compliance with thecarbon disulfide concentrationlimitation in paragraph (a) of thissection. One test shall be conducted foreach standard operating procedure.

(i) Method 1 or 1A of 40 CFR part 60,appendix A, as required, shall be usedfor selection of the sampling sites.

(ii) The gas volumetric flow rate shallbe determined using Method 2, 2A, 2C,

or 2D of 40 CFR part 60, appendix A,as required.

(iii) To determine compliance withthe carbon disulfide concentration limitin paragraph (a) of this section, theowner or operator shall use Method 18or Method 25A of 40 CFR part 60,appendix A, to measure carbondisulfide. Alternatively, any othermethod or data that has been validatedaccording to the applicable proceduresin Method 301 of appendix A of thispart may be used. The followingprocedures shall be used to calculatecarbon disulfide concentration:

(A) The minimum sampling time foreach run shall be 1 hour, in whicheither an integrated sample or aminimum of four grab samples shall betaken. If grab sampling is used, then thesamples shall be taken at approximatelyequal intervals in time, such as 15minute intervals during the run.

(B) The concentration of carbondisulfide shall be calculated usingEquation 32.

C

C

nEqCS

CS ii

n

2

21 32=( )

[ ]=∑

.

where:CCS2=Concentration of carbon disulfide,

dry basis, ppmv.CCS2i=Concentration of carbon disulfide

of sample i, dry basis, ppmv.n=Number of samples in the sample

run.(2) The owner or operator shall use

engineering assessment to demonstratecompliance with the carbon disulfideconcentration limitation in paragraph(a) of this section. Engineeringassessment includes, but is not limitedto, the following:

(i) Previous test results, provided thetests are representative of currentoperating practices at the process unit.

(ii) Bench-scale or pilot-scale test datarepresentative of the process underrepresentative operating conditions.

(iii) Flow rate and/or carbon disulfideemission rate specified or impliedwithin an applicable permit limit.

(iv) Design analysis based on acceptedchemical engineering principles,measurable process parameters, orphysical or chemical laws or properties.Examples of analytical methods include,but are not limited to:

(A) Use of material balances,(B) Estimation of flow rate based on

physical equipment design such aspump or blower capacities, and

(C) Estimation of carbon disulfideconcentrations based on saturationconditions.


(v) All data, assumptions, andprocedures used in the engineeringassessment shall be documented.

(d) Owners and operators of sourcessubject to this section shall maintain therecords specified in paragraphs (d)(1)and (d)(2) of this section.

(1) Documentation of the results of thetesting required by paragraph (c) of thissection.

(2) A description of the standardoperating procedure used during thetesting. This description shall include,at a minimum, an identification of thesulfur containing shortstop added to thestyrene butadiene rubber prior to thedryers, an identification of the point andtime in the process where the sulfurcontaining shortstop is added, and anidentification of the amount of sulfurcontaining shortstop added per unit oflatex.

(e) Owners and operators shall submitthe reports as specified in paragraphs(e)(1) and (e)(2) of this section.

(1) As part of the Notification ofCompliance Status specified in§ 63.506(e)(5), documentation of theresults of the testing required byparagraph (c) of this section.

(2) If changes are made in thestandard operating procedure usedduring the compliance test and recordedin accordance with paragraph (d)(2) ofthis section, and if those changes havethe potential for increasing theconcentration of carbon disulfide in thecrumb dryer exhaust to above the 45ppmv limit, the owner or operator shall:

(i) Redetermine compliance using thetest procedures in paragraph (c) of thissection, and

(ii) Submit documentation of thetesting results in the next periodicreport required by § 63.506(e)(6).

§ 63.501 Wastewater provisions.(a) For each process wastewater

stream originating at an affected source,except those wastewater streamsexempted by paragraph (c) of thissection, the owner or operator shallcomply with the requirements of§§ 63.131 through 63.148 of subpart G,with the differences noted in paragraphs(a)(1) through (a)(11) of this section, forthe purposes of this subpart.

(1) When the determination ofequivalence criteria in § 63.102(b) ofsubpart F is referred to in §§ 63.132,63.133, and 63.137 of subpart G, theprovisions in § 63.6(g) of subpart A shallapply for the purposes of this subpart.

(2) When the storage tankrequirements contained in §§ 63.119through 63.123 of subpart G are referredto in §§ 63.132 through 63.148 ofsubpart G, §§ 63.119 through 63.123 ofsubpart G are applicable, with the

exception of the differences referred toin § 63.484, for the purposes of thissubpart.

(3) When the Implementation Planrequirements contained in § 63.151 insubpart G are referred to in § 63.146 ofsubpart G, the owner or operator of anaffected source subject to this subpartneed not comply.

(4) When the Initial Notification Planrequirements in § 63.151(b) of subpart Gare referred to in § 63.146 of subpart G,the owner or operator of an affectedsource subject to this subpart need notcomply.

(5) When the owner or operatorrequests to use alternatives to thecontinuous operating parametermonitoring and recordkeepingprovisions referred to in § 63.151(g) ofsubpart G, or the owner or operatorsubmits an operating permit applicationinstead of an Implementation Plan asspecified in § 63.152(e) of subpart G, asreferred to in § 63.146(a)(3) of subpart G,§ 63.506(f) and § 63.506(e)(8),respectively, shall apply for thepurposes of this subpart.

(6) When the Notification ofCompliance Status requirementscontained in § 63.152(b) of subpart G arereferred to in §§ 63.146 and 63.147 ofsubpart G, the Notification ofCompliance Status requirementscontained in § 63.506(e)(5) shall applyfor the purposes of this subpart.

(7) When the Periodic Reportrequirements contained in § 63.152(c) ofsubpart G are referred to in §§ 63.146and 63.147 of subpart G, the PeriodicReport requirements contained in§ 63.506(e)(6) shall apply for thepurposes of this subpart.

(8) When the term ‘‘range’’ is used in§ 63.143(f) of subpart G, the term ‘‘level’’shall be used instead, for the purposesof this subpart. This level shall bedetermined using the proceduresspecified in § 63.505.

(9) For the purposes of this subpart,owners or operators are not required tocomply with the provisions of§ 63.138(e)(2) of subpart G whichspecify that owners or operators shalldemonstrate that 95 percent of the massof HAP, as listed in Table 9 of subpartG, is removed from the wastewaterstream or combination of wastewaterstreams by the procedure specified in§ 63.145(i) of subpart G for a biologicaltreatment unit.

(10) For the purposes of this subpart,owners or operators are not required tocomply with the provisions of§ 63.138(j)(3) of subpart G which specifythat owners or operators shall use theprocedures specified in Appendix C ofsubpart G to demonstrate compliancewhen using a biological treatment unit.

(11) When the provisions of§ 63.139(c)(1)(ii) of subpart G or theprovisions of § 63.145(e)(2)(ii)(B) specifythat Method 18 shall be used, Method18 or Method 25A may be used for thepurposes of this subpart. The use ofMethod 25A shall comply withparagraphs (a)(11)(i) and (a)(11)(ii) ofthis section.

(i) The organic HAP used as thecalibration gas for Method 25A shall bethe single organic HAP representing thelargest percent by volume of theemissions.

(ii) The use of Method 25A isacceptable if the response from the high-level calibration gas is at least 20 timesthe standard deviation of the responsefrom the zero calibration gas when theinstrument is zeroed on the mostsensitive scale.

(b) Except for those streams exemptedby paragraph (c) of this section, theowner or operator of each affectedsource shall comply with therequirements for maintenancewastewater in § 63.105 of subpart F,except that when § 63.105(a) refers to‘‘organic HAPs,’’ the definition oforganic HAP in § 63.482 shall apply forthe purposes of this subpart.

(c) The following wastewater streamsare exempt from the requirements ofparagraphs (a) and (b) of this section:

(1) Back-end wastewater streamsoriginating from equipment that onlyproduces latex products.

(2) Back-end wastewater streams ataffected sources that are subject to aresidual organic HAP limitation in§ 63.494(a), and that are complying withthese limitations through the use ofstripping technology.

(d) The compliance date for theaffected source subject to the provisionsof this section is specified in § 63.481.

§ 63.502 Equipment leak provisions.

(a) The owner or operator of eachaffected source, shall comply with therequirements of subpart H of this partfor all equipment in organic HAPservice, with the exception noted inparagraphs (b) through (h) of thissection.

(b) Surge control vessels and bottomsreceivers described in paragraphs (b)(1)through (b)(6) of this section are exemptfrom the requirements contained in§ 63.170 of subpart H.

(1) Surge control vessels and bottomsreceivers containing styrene-butadienelatex;

(2) Surge control vessels and bottomsreceivers containing other latexproducts and located downstream of thestripping operations;


(3) Surge control vessels and bottomsreceivers containing high conversionlatex products;

(4) Surge control vessels and bottomsreceivers located downstream of thestripping operations at affected sourcessubject to the back-end residual organicHAP limitation located in § 63.494, thatare complying through the use ofstripping technology, as specified in§ 63.495;

(5) Surge control vessels and bottomsreceivers containing styrene;

(6) Surge control vessels and bottomsreceivers containing acrylamide; and

(7) Surge control vessels and bottomsreceivers containing epichlorohydrin.

(c) The compliance date for theequipment leak provisions in thissection is provided in § 63.481.

(d) For an affected source producingpolybutadiene rubber and styrenebutadiene rubber by solution, theindications of liquids dripping, asdefined in subpart H of this part, frombleed ports in pumps and agitator sealsin light liquid service, shall not beconsidered a leak. For the purposes ofthis subpart, a ‘‘bleed port’’ is atechnologically-required feature of thepump or seal whereby polymer fluidused to provide lubrication and/orcooling of the pump or agitator shaftexits the pump, thereby resulting in avisible dripping of fluid.

(e) Affected sources subject to subpartI of this part shall continue to complywith subpart I until the compliance datespecified in § 63.481. After thecompliance date for this section, thesource shall be subject to subpart H ofthis part and shall no longer be subjectto subpart I.

(f) The owner or operator of eachaffected source shall comply with therequirements of § 63.104 of subpart F forheat exchange systems.

(g) Owners and operators of anaffected source subject to this subpartare not required to submit the InitialNotification required by § 63.182(a)(1)and § 63.182(b) of subpart H.

(h) The Notification of ComplianceStatus required by § 63.182(a)(2) and§ 63.182(c) of subpart H shall besubmitted within 150 days (rather than90 days) of the applicable compliancedate specified in § 63.481 for theequipment leak provisions. Thenotification can be submitted as part ofthe Notification of Compliance Statusrequired by § 63.506(e)(5).

(i) The Periodic Reports required by§ 63.182(a)(3) and § 63.182(d) of subpartH shall be submitted as part of thePeriodic Reports required by§ 63.506(e)(6).

§ 63.503 Emissions averaging provisions.

(a) This section applies to owners oroperators of existing affected sourceswho seek to comply with § 63.483(b) byusing emissions averaging rather thanfollowing the provisions of §§ 63.484,63.485, 63.486, 63.494, and 64.488.

(1) The following emission pointlimitations apply to the use of theseprovisions:

(i) All emission points included in anemissions average shall be from thesame affected source. There may be anemissions average for each individualaffected source located at a plant site.

(ii)(A) If a plant site has only oneaffected source for which emissionsaveraging is being used to demonstratecompliance, the number of emissionpoints allowed to be included in theemission average is limited to twenty.This number may be increased by up tofive additional points if pollutionprevention measures are used to controlfive or more of the emission pointsincluded in the emissions average.

(B) If a plant site has two or moreaffected sources for which emissionsaveraging is being used to demonstratecompliance, the number of emissionpoints allowed in the emissions averagefor those affected sources is limited totwenty. This number may be increasedby up to five additional emission pointsif pollution prevention measures areused to control five or more of theemission points included in theemissions averages.

(2) Compliance with the provisions ofthis section can be based on eitherorganic HAP or TOC.

(3) For the purposes of theseprovisions, whenever Method 18 isspecified within the paragraphs of thissection or is specified by referencethrough provisions outside this section,Method 18 or Method 25A may be used.The use of Method 25A shall complywith paragraphs (a)(3)(i) and (a)(3)(ii) ofthis section.

(i) The organic HAP used as thecalibration gas for Method 25A shall bethe single organic HAP representing thelargest percent by volume of theemissions.

(ii) The use of Method 25A isacceptable if the response from the high-level calibration gas is at least 20 timesthe standard deviation of the responsefrom the zero calibration gas when theinstrument is zeroed on the mostsensitive scale.

(b) Unless an operating permitapplication has been submitted, theowner or operator shall develop andsubmit for approval an EmissionsAveraging Plan containing all of theinformation required in § 63.506(e)(4)

for all emission points to be included inan emissions average.

(c) Paragraphs (c)(1) through (c)(4) ofthis section describe the emission pointsthat can be used to generate emissionsaveraging credits if control was appliedafter November 15, 1990 and ifsufficient information is available todetermine the appropriate value ofcredits for the emission point. Paragraph(c)(5) of this section discusses the use ofpollution prevention in generatingemissions averaging credits.

(1) Storage vessels, batch front-endprocess vents, aggregate batch ventstreams, continuous front-end processvents, and process wastewater streamsthat are determined to be Group 2emission points.

(2) Storage vessels, continuous front-end process vents, and processwastewater steams that are determinedto be Group 1 emission points and thatare controlled by a technology that theAdministrator or permitting authorityagrees has a higher nominal efficiencythan the reference control technology.Information on the nominal efficienciesfor such technologies must be submittedand approved as provided in paragraph(i) of this section.

(3) Batch front-end process vents andaggregate batch vent streams that aredetermined to be Group 1 emissionpoints and that are controlled to a levelmore stringent than the applicablestandard.

(4) Back-end process operations thatare controlled such that organic HAPemissions from the back-end processoperation are less than would beachieved by meeting the residualorganic HAP limits in § 63.494. For thepurposes of the emission averagingprovisions in this section, all back-endprocess operations at an affected facilityshall be considered a single emissionpoint.

(5) The percent reduction for anystorage vessel, batch front-end processvent, aggregate batch vent stream,continuous front-end process vent, andprocess wastewater stream shall bedetermined using the proceduresspecified in paragraph (j) of this section.

(i) For a Group 1 storage vessel, batchfront-end process vent, aggregate batchvent stream, continuous front-endprocess vent, or process wastewaterstream, the pollution preventionmeasure must reduce emissions morethan if the reference control technologyor standard had been applied to theemission point instead of the pollutionprevention measure, except as providedin paragraph (c)(5)(ii) of this section.

(ii) If a pollution prevention measureis used in conjunction with othercontrols for a Group 1 storage vessel,


batch front-end process vent, aggregatebatch vent stream, continuous front-endprocess vent, or process wastewaterstream, the pollution preventionmeasure alone does not have to reduceemissions more than the referencecontrol technology or standard, but thecombination of the pollution preventionmeasure and other controls must reduceemissions more than if the applicablereference control technology or standardhad been applied instead of thepollution prevention measure.

(d) The following emission pointscannot be used to generate emissionsaveraging credits:

(1) Emission points already controlledon or before November 15, 1990 cannotbe used to generate credits unless thelevel of control was increased afterNovember 15, 1990. In this case, creditwill be allowed only for the increase incontrol after November 15, 1990.

(2) Group 1 emission points,identified in paragraph (c)(2) of thissection, that are controlled by areference control technology cannot beused to generate credits unless thereference control technology has beenapproved for use in a different mannerand a higher nominal efficiency hasbeen assigned according to theprocedures in paragraph (i) of thissection.

(3) Emission points on nonoperatingEPPU cannot be used to generatecredits. EPPU that are shutdown cannotbe used to generate credits or debits.

(4) Maintenance wastewater cannot beused to generate credits. Wastewaterstreams treated in biological treatmentunits cannot be used to generate credits.These two types of wastewater cannotbe used to generate credits or debits. Forthe purposes of this section, the termswastewater and wastewater stream areused to mean process wastewater.

(5) Emission points controlled tocomply with a State or Federal ruleother than this subpart cannot be usedto generate credits, unless the level ofcontrol has been increased afterNovember 15, 1990 to a level abovewhat is required by the other State orFederal rule. Only the control abovewhat is required by the other State orFederal rule will be credited. However,if an emission point has been used togenerate emissions averaging credit in

an approved emissions average, and theemission point is subsequently madesubject to a State or Federal rule otherthan this subpart, the emission pointcan continue to generate emissionsaveraging credit for the purpose ofcomplying with the previouslyapproved emissions average.

(e) For all emission points included inan emissions average, the owner oroperator shall perform the followingtasks:

(1) Calculate and record monthlydebits for all Group 1 emission pointsthat are controlled to a level lessstringent than the reference controltechnology or standard for thoseemission points. The Group 1 emissionpoints are identified in paragraphs (c)(2)through (c)(4) of this section. Equationsin paragraph (g) of this section shall beused to calculate debits.

(2) Calculate and record monthlycredits for all Group 1 and Group 2emission points that are overcontrolledto compensate for the debits. Equationsin paragraph (h) of this section shall beused to calculate credits. Emissionpoints and controls that meet thecriteria of paragraph (c) of this sectionmay be included in the creditcalculation, whereas those described inparagraph (d) of this section shall not beincluded.

(3) Demonstrate that annual creditscalculated according to paragraph (h) ofthis section are greater than or equal todebits calculated for the same annualcompliance period according toparagraph (g) of this section.

(i) The owner or operator may chooseto include more than the requirednumber of credit-generating emissionpoints in an emissions average in orderto increase the likelihood of being incompliance.

(ii) The initial demonstration in theEmissions Averaging Plan or operatingpermit application that credit-generatingemission points will be capable ofgenerating sufficient credits to offset thedebits from the debit-generatingemission points must be made underrepresentative operating conditions.After the compliance date, actualoperating data will be used for all debitand credit calculations.

(4) Demonstrate that debits calculatedfor a quarterly (3-month) period

according to paragraph (g) of thissection are not more than 1.30 times thecredits for the same period calculatedaccording to paragraph (h) of thissection. Compliance for the quarter shallbe determined based on the ratio ofcredits and debits from that quarter,with 30 percent more debits than creditsallowed on a quarterly basis.

(5) Record and report quarterly andannual credits and debits in the PeriodicReports as specified in § 63.506(e)(6).Every fourth Periodic Report shallinclude a certification of compliancewith the emissions averaging provisionsas required by § 63.506(e)(6)(vi)(D)(2).

(f) Debits and credits shall becalculated in accordance with themethods and procedures specified inparagraphs (g) and (h) of this section,respectively, and shall not includeemissions during the following periods:

(1) Emissions during periods ofstartup, shutdown, and malfunction asdescribed in the Startup, Shutdown, andMalfunction Plan.

(2) Emissions during periods ofmonitoring excursions, as defined in§ 63.505 (g) or (h). For these periods, thecalculation of monthly credits anddebits shall be adjusted as specified inparagraphs (f)(2)(i) through (f)(2)(iii) ofthis section.

(i) No credits would be assigned to thecredit-generating emission point.

(ii) Maximum debits would beassigned to the debit-generatingemission point.

(iii) The owner or operator maydemonstrate to the Administrator thatfull or partial credits or debits should beassigned using the procedures inparagraph (l) of this section.

(g) Debits are generated by thedifference between the actual emissionsfrom a Group 1 emission point that isuncontrolled or is controlled to a levelless stringent than the applicablereference control technology or standardand the emissions allowed for the Group1 emission point. Debits shall becalculated as follows:

(1) Source-wide debits shall becalculated using Equation 33. Debitsand all terms of the equation are in unitsof megagrams per month (Mg/month).


Debits ECFEPV ECFEPV

ES ES EBEP EBEP

EWW EWW EBFEPV EBFEPV Eq

EABV EABV

iACTUAL iui

n

iACTUAL iui

n

ACTUAL c

iACTUAL ici

n

iACTUAL iui

n

iACTUAL iui

n

= − ( )( )

+ − ( )( ) + −( )

+ −( ) + − ( )( ) [ ]

+ − ( )( )

=

=

= =

=

∑

∑

∑ ∑

∑

0 02

0 05

0 1 33

0 1

1

1

1 1

1

.

.

. .

.

where:ECFEPViACTUAL=Emissions from each

Group 1 continuous front-endprocess vent i that is uncontrolledor is controlled to a level lessstringent than the applicablereference control technology.ECFEPViACTUAL is calculatedaccording to paragraph (g)(2)(iii) ofthis section.

(0.02)ECFEPViu=Emissions from eachGroup 1 continuous front-endprocess vent i if the applicablereference control technology hadbeen applied to the uncontrolledemissions. ECFEPViu is calculatedaccording to paragraph (g)(2)(ii) ofthis section.

ESiACTUAL=Emissions from each Group1 storage vessel i that isuncontrolled or is controlled to alevel less stringent than theapplicable reference controltechnology or standard. ESiACTUAL

is calculated according to paragraph(g)(3) of this section.

(0.05)ESiu=Emissions from each Group 1storage vessel i if the applicablereference control technology orstandard had been applied to theuncontrolled emissions. ESiu iscalculated according to paragraph(g)(3) of this section.

EBEPACTUAL=Emissions from back-endprocess operations that do not meetthe residual organic HAP limits in§ 63.494. EBEPACTUAL is calculatedaccording to paragraph (g)(4)(i) ofthis section.

EBEPc=Emissions from back-endprocess operations if the residualorganic HAP limits in § 63.494(a)were met. EBEPc is calculatedaccording to paragraph (g)(4)(ii) ofthis section.

EWWiACTUAL=Emissions from eachGroup 1 wastewater stream i that isuncontrolled or is controlled to alevel less stringent than theapplicable reference controltechnology. EWW2iACTUAL iscalculated according to paragraph(g)(5) of this section.

EWWic=Emissions from each Group 1wastewater stream i if the referencecontrol technology had beenapplied to the uncontrolledemissions. EWWic is calculatedaccording to paragraph (g)(5) of thissection.

EBFEPViACTUAL=Emissions from eachGroup 1 batch front-end processvent stream i that is uncontrolled oris controlled to a level less stringentthan the reference controltechnology. EBFEPViACTUAL iscalculated according to paragraph(g)(6)(ii) of this section.

(0.1)EBFEPViu=Emissions from eachGroup 1 batch front-end processvent i if the applicable referencecontrol technology or standard hadbeen applied to the uncontrolledemissions. EBFEPViu is calculatedaccording to paragraph (g)(6)(i) ofthis section.

EABViACTUAL=Emissions from eachGroup 1 aggregate batch vent stream

i that is uncontrolled or iscontrolled to a level less stringentthan the applicable referencecontrol technology. EABViACTUAL iscalculated according to paragraph(g)(7)(iii) of this section.

(0.1)EABViu=Emissions from eachGroup 1 aggregate batch vent streami if the applicable reference controltechnology had been applied to theuncontrolled emissions. EABViu iscalculated according to paragraph(g)(7)(ii) of this section.

n=The number of emission points beingincluded in the emissions average.

(2) Emissions from continuous front-end process vents shall be calculated asfollows:

(i) For purposes of determiningcontinuous front-end process ventstream flow rate, organic HAPconcentrations, and temperature, thesampling site shall be after the finalproduct recovery device, if any recoverydevices are present; before any controldevice (for continuous front-end processvents, recovery devices shall not beconsidered control devices); and beforedischarge to the atmosphere. Method 1or 1A of 40 CFR part 60, appendix A,shall be used for selection of thesampling site.

(ii) ECFEPViu for each continuousfront-end process vent i shall becalculated using Equation 34.

ECFEPV Qh C M Eqiu j jj

n

= ×( )

[ ]−

=∑2 494 10 349

1

. .

where:ECFEPViu=Uncontrolled continuous

front-end process vent emission ratefrom continuous front-end processvent i, Mg/month.

Q=Vent stream flow rate, dry standardm3/min, measured using Method 2,2A, 2C, or 2D of 40 CFR part 60,appendix A, as appropriate.

h=Monthly hours of operation duringwhich positive flow is present in

the continuous front-end processvent, hr/month.

Cj=Concentration, ppmv, dry basis, oforganic HAP j as measured byMethod 18 or Method 25A of 40CFR part 60, appendix A.


Mj=Molecular weight of organic HAP j,gram per gram-mole.

n=Number of organic HAP in stream.(A) The values of Q and Cj shall be

determined during a performance testconducted under representativeoperating conditions. The values of Qand Cj shall be established in theNotification of Compliance Status andmust be updated as provided inparagraph (g)(2)(ii)(B) of this section.

(B) If there is a change in capacityutilization other than a change inmonthly operating hours, or if any otherchange is made to the process or

product recovery equipment oroperation such that the previouslymeasured values of Q and Cj are nolonger representative, a newperformance test shall be conducted todetermine new representative values ofQ and Cj. These new values shall beused to calculate debits and credits fromthe time of the change forward, and thenew values shall be reported in the nextPeriodic Report.

(iii) The following procedures andequations shall be used to calculateECFEPViACTUAL:

(A) If the continuous front-endprocess vent is not controlled by acontrol device or pollution preventionmeasure, ECFEPViACTUAL = ECFEPViu,where ECFEPViu is calculated accordingto the procedures contained inparagraphs (g)(2)(i) and (g)(2)(ii) of thissection.

(B) If the continuous front-endprocess vent is controlled using acontrol device or a pollution preventionmeasure achieving less than 98-percentreduction, ECFEPViACTUAL is calculatedusing Equation 35.

ECFEPV ECFEPVPercent reduction

EqiACTUAL iu= × −

[ ]1100%

35.

Where:ECFEPViACTUAL = Emissions from each

Group 1 continuous front-endprocess vent i that is uncontrolledor is controlled to a level lessstringent than the reference controltechnology.

ECFEPViu = Uncontrolled continuousfront-end process vent emission ratefrom continuous front-end processvent i, Mg/month.

(1) The percent reduction shall bemeasured according to the proceduresin § 63.116 of subpart G if a combustioncontrol device is used. For a flaremeeting the criteria in § 63.116(a) ofsubpart G, or a boiler or process heatermeeting the criteria in § 63.116(b) ofsubpart G, the percent reduction shallbe 98 percent. If a noncombustion

control device is used, percentreduction shall be demonstrated by aperformance test at the inlet and outletof the device, or, if testing is notfeasible, by a control design evaluationand documented engineeringcalculations.

(2) For determining debits from Group1 continuous front-end process vents,product recovery devices shall not beconsidered control devices and cannotbe assigned a percent reduction incalculating ECFEPViACTUAL. Thesampling site for measurement ofuncontrolled emissions is after the finalproduct recovery device. However, asprovided in § 63.113(a)(3) of subpart G,a Group 1 continuous front-end processvent may add sufficient productrecovery to raise the TRE index value

above 1.0, thereby becoming a Group 2continuous front-end process vent. Sucha continuous front-end process ventwould not be a Group 1 continuousfront-end process vent and would,therefore, not be included indetermining debits under thisparagraph.

(3) Procedures for calculating thepercent reduction of pollutionprevention measures are specified inparagraph (j) of this section.

(3) Emissions from storage vesselsshall be calculated using the proceduresspecified in § 63.150(g)(3) of subpart G.

(4) Emissions from back-end processoperations shall be calculated asfollows:

(i) Equation 36 shall be used tocalculate EBEPACTUAL:

EBEP C P EqACTUAL i ii

n

= ( ) ( )( ) [ ]=∑1 000 36

1

, .

where:

EBEPACTUAL = Actual emissions fromback-end process operations, Mg/month.

Ci = Residual organic HAP content ofsample i, kg organic HAP per Mglatex or dry crumb rubber.

Pi = Weight of latex or dry crumb rubberleaving the stripper represented bysample i, Mg.

(ii) Equation 37 shall be used tocalculate EBEPc:

EBEP HAP P EqC it month= ( )( )( ) [ ]1 000 37, .lim

where:

EBEPc = Emissions from back-endprocess operations if the residualorganic HAP limits in § 63.494(a)were met, Mg/month.

HAPlimit = Residual organic HAP limitsin § 63.494 of this subpart, kgorganic HAP per Mg latex or drycrumb rubber.

Pmonth=Weight of latex or dry crumbrubber leaving the stripper in themonth, Mg.

(5) Emissions from wastewater shallbe calculated using the proceduresspecified in § 63.150(g)(5) of subpart G.

(6) Emissions from batch front-endprocess vents shall be calculated asfollows:

(i) EBFEPViu for each batch front-endprocess vent i shall be calculated usingthe procedures specified in § 63.488(b).

(ii) The following procedures andequations shall be used to determineEBFEPViACTUAL:

(A) If the batch front-end process ventis not controlled by a control device orpollution prevention measure,


EBFEPViACTUAL=EBFEPViu, whereEBFEPViu is calculated according to theprocedures in § 63.488(b).

(B) If the batch front-end process ventis controlled using a control device ora pollution prevention measureachieving less than 90 percent reduction

for the batch cycle, calculateEBFEPViACTUAL using Equation 38,where percent reduction is for the batchcycle.

EBFEPV EBFEPVPercent re


1 38

duction100%

[ . ]

(1) The percent reduction for thebatch cycle shall be measured accordingto the procedures in § 63.490(c)(2).

(2) The percent reduction for controldevices shall be calculated according tothe procedures in § 63.490 (c)(2)(i)through (c)(2)(iii).

(3) The percent reduction of pollutionprevention measures shall be calculated

using the procedures specified inparagraph (j) of this section.

(7) Emissions from aggregate batchvents shall be calculated as follows:

(i) For purposes of determiningaggregate batch vent stream flow rate,organic HAP concentrations, andtemperature, the sampling site shall bebefore any control device and before

discharge to the atmosphere. Method 1or 1A of 40 CFR part 60, appendix A,shall be used for selection of thesampling site.

(ii) EABViu for each aggregate batchvent i shall be calculated using Equation39.

EABV Qh C M Eqiu j jj

n

= ×( )

−

=∑2 494 10 9

1

. [ . 39]

where:EABViu=Uncontrolled aggregate batch

vent emission rate from aggregatebatch vent i, Mg/month.

Q=Vent stream flow rate, dry standardcubic meters per minute, measuredusing Method 2, 2A, 2C, or 2D of 40CFR part 60, appendix A, asappropriate.

h=Monthly hours of operation duringwhich positive flow is present fromthe aggregate batch vent stream, hr/month.

Cj=Concentration, ppmv, dry basis, oforganic HAP j as measured byMethod 18 of 40 CFR part 60,appendix A.

Mj=Molecular weight of organic HAP j,gram per gram-mole.

n=Number of organic HAP in thestream.

(A) The values of Q and Cj shall bedetermined during a performance testconducted under representativeoperating conditions. The values of Qand Cj shall be established in theNotification of Compliance Status andmust be updated as provided inparagraph (g)(7)(ii)(B) of this section.

(B) If there is a change in capacityutilization other than a change inmonthly operating hours, or if any otherchange is made to the process orproduct recovery equipment oroperation such that the previouslymeasured values of Q and Cj are nolonger representative, a newperformance test shall be conducted todetermine new representative values ofQ and Cj. These new values shall beused to calculate debits and credits fromthe time of the change forward, and the

new values shall be reported in the nextPeriodic Report.

(iii) The following procedures andequations shall be used to calculateEABViACTUAL:

(A) If the aggregate batch vent is notcontrolled by a control device orpollution prevention measure,EABViACTUAL = EABViu, where EABViu

is calculated according to theprocedures in paragraphs (g)(7)(i) and(g)(7)(ii) of this section.

(B) If the aggregate batch vent streamis controlled using a control device ora pollution prevention measureachieving less than 90 percentreduction, calculate EABViACTUAL usingEquation 40.

EABV EABVPercent re


1duction

100% 40[ . ]

(1) The percent reduction for controldevices shall be determined accordingto the procedures in § 63.490(e).

(2) The percent reduction of pollutionprevention measures shall be calculatedaccording to the procedures specified inparagraph (j) of this section.

(h) Credits are generated by thedifference between emissions that areallowed for each Group 1 and Group 2emission point and the actual emissionsfrom that Group 1 or Group 2 emissionpoint that has been controlled afterNovember 15, 1990 to a level morestringent than what is required by this

subpart or any other State or Federalrule or statute. Credits shall becalculated as follows:

(1) Source-wide credits shall becalculated using Equation 41. Creditsand all terms of the equation are in unitsof Mg/month, and the baseline date isNovember 15, 1990.


Credits D ECFEPV ECFEPV D ECFEPV ECFEPV

D ES ES D ES ES D EBEP EBEP

D EWW EWW D EWW EWW

iu iACTUALi

n

iBASE iACTUALi

m

iu iACTUALi

n

iBASE iACTUAL c ACTUALi

m

ic iACTUAL iBASE iACTUALi

m

= ( ) −( ) + −( )

+ ( ) −( ) + −( ) + −( )

+ −( ) + −( )

= =

= =

=

∑ ∑

∑ ∑

∑

0 02 1 1 2 2

0 05 1 1 2 2

1 1 2 2

1 1

1 1

1

.

.

[[ .

. .

Eq

D EBFEPV EBFEPV D EABV EABV

D EBFEPV EBFEPV D EABV EABV

i

n

iu iACTUALi

n

iu iACTUALi

n

iBASE iACTUALi

m

iBASE iACTUALi

m

41]=

= =

= =

∑

∑ ∑

∑ ∑

+ ( ) −( ) + ( ) −( )

+ −( ) + −( )

1

1 1

1 1

0 1 1 1 0 1 1 1

2 2 2 2

where:D = Discount factor = 0.9 for all credit

generating emission points, exceptthose controlled by a pollutionprevention measure; discount factor= 1.0 for each credit generatingemission point controlled by apollution prevention measure (i.e.,no discount provided).

ECFEPV1iACTUAL = Emissions for eachGroup 1 continuous front-endprocess vent i that is controlled toa level more stringent than thereference control technology.ECFEPV1iACTUAL is calculatedaccording to paragraph (h)(2)(ii) ofthis section.

(0.02)ECFEPV1iu = Emissions from eachGroup 1 continuous front-endprocess vent i if the referencecontrol technology had beenapplied to the uncontrolledemissions. ECFEPV1iu is calculatedaccording to paragraph (h)(2)(i) ofthis section.

ECFEPV2iACTUAL = Emissions from eachGroup 2 continuous front-endprocess vent i that is controlled.ECFEPV2iACTUAL is calculatedaccording to paragraph (h)(2)(iii) ofthis section.

ECFEPV2iBASE = Emissions from eachGroup 2 continuous front-endprocess vent i at the baseline date.ECFEPV1iBASE is calculated inparagraph (h)(2)(iv) of this section.

ES1iACTUAL = Emissions from eachGroup 1 storage vessel i that iscontrolled to a level more stringentthan the reference controltechnology or standard. ES1iACTUAL

is calculated according to paragraph(h)(3) of this section.

(0.05) ES1iu = Emissions from eachGroup 1 storage vessel i if thereference control technology hadbeen applied to the uncontrolledemissions. ES1iu is calculated

according to paragraph (h)(3) of thissection.

ES2iACTUAL = Emissions from eachGroup 2 storage vessel i that iscontrolled. ES2iACTUAL is calculatedaccording to paragraph (h)(3) of thissection.

ES2iBASE = Emissions from each Group2 storage vessel i at the baselinedate. ES2iBASE is calculated inparagraph (h)(3) of this section.

EBEPACTUAL = Actual emissions fromback-end process operations, Mg/month. EBEPACTUAL is calculated inparagraph (h)(4)(i) of this section.

EBEPc = Emissions from back-endprocess operations if the residualorganic HAP limits in § 63.494(a)were met, Mg/month. EBEPc iscalculated in paragraph (h)(4)(ii) ofthis section.

EWW1iACTUAL = Emissions from eachGroup 1 wastewater stream i that iscontrolled to a level more stringentthan the reference controltechnology. EWW1iACTUAL iscalculated according to paragraph(h)(5) of this section.

EWW1ic = Emissions from each Group 1wastewater stream i if the referencecontrol technology had beenapplied to the uncontrolledemissions. EWW1ic is calculatedaccording to paragraph (h)(5) of thissection.

EWW2iACTUAL = Emissions from eachGroup 2 wastewater stream i that iscontrolled. EWW2iACTUAL iscalculated according to paragraph(h)(5) of this section.

EWW2iBASE = Emissions from eachGroup 2 wastewater stream i at thebaseline date. EWW2iBASE iscalculated according to paragraph(h)(5) of this section.

(0.1) EBFEPV1iu = Emissions from eachGroup 1 batch front-end processvent i if the applicable referencecontrol technology had been

applied to the uncontrolledemissions. EBFEPViu is calculatedaccording to paragraph (h)(6)(i) ofthis section.

EBFEPV1iACTUAL = Emissions from eachGroup 1 batch front-end processvent i that is controlled to a levelmore stringent than the referencecontrol technology.EBFEPV1iACTUAL is calculatedaccording to paragraph (h)(6)(ii) ofthis section.

(0.1)EABV1iu = Emissions from eachGroup 1 aggregate batch vent streami if the applicable reference controltechnology had been applied to theuncontrolled emissions. EABV1iu iscalculated according to paragraph(h)(7)(i) of this section.

EABV1iACTUAL = Emissions from eachGroup 1 aggregate batch vent streami that is controlled to a level morestringent than the reference controltechnology or standard.EABV1iACTUAL is calculatedaccording to paragraph (h)(7)(ii) ofthis section.

EBFEPV2iBASE = Emissions from eachGroup 2 batch front-end processvent i at the baseline date.EBFEPV2iBASE is calculatedaccording to paragraph (h)(6)(iv) ofthis section.

EBFEPV2iACTUAL = Emissions from eachGroup 2 batch front-end processvent i that is controlled.EBFEPV2iACTUAL is calculatedaccording to paragraph (h)(6)(iii) ofthis section.

EABV2iBASE = Emissions from eachGroup 2 aggregate batch vent streami at the baseline date. EABV2iBASE iscalculated according to paragraph(g)(7)(iv) of this section.

EABV2iACTUAL = Emissions from eachGroup 2 aggregate batch vent streami that is controlled. EABV2iACTUAL

is calculated according to paragraph(g)(7)(iii) of this section.


n = Number of Group 1 emission pointsincluded in the emissions average.The value of n is not necessarily thesame for continuous front-endprocess vents, batch front-endprocess vents, aggregate batch ventstreams, storage vessels, wastewaterstreams, or the collection of processsections within the affected source.

m = Number of Group 2 emission pointsincluded in the emissions average.The value of m is not necessarilythe same for continuous front-endprocess vents, batch front-endprocess vents, aggregate batch ventstreams, storage vessels, wastewaterstreams, or the collection of processsections within the affected source.

(i) Except as specified in paragraph(h)(1)(iv) of this section, for an emissionpoint controlled using a referencecontrol technology, the percentreduction for calculating credits shall beno greater than the nominal efficiencyassociated with the reference controltechnology, unless a higher nominalefficiency is assigned as specified inparagraph (h)(1)(ii) of this section.

(ii) For an emission point controlledto a level more stringent than thereference control technology, thenominal efficiency for calculatingcredits shall be assigned as described inparagraph (i) of this section. A referencecontrol technology may be approved foruse in a different manner and assigneda higher nominal efficiency according tothe procedures in paragraph (i) of thissection. A reference control technologymay be approved for use in a differentmanner and assigned a higher nominalefficiency according to the procedure inparagraph (i) of this section.

(iii) For an emission point controlledusing a pollution prevention measure,except for back-end process operationemissions, the nominal efficiency forcalculating credits shall be asdetermined as described in paragraph (j)of this section. Emissions for back-endprocess operations shall be determinedas described in paragraph (h)(4) of thissection.

(iv) For Group 1 and Group 2 batchfront-end process vents and Group 1and Group 2 aggregate batch vent

streams, the percent reduction forcalculating credits shall be the percentreduction determined according to theprocedures in paragraphs (h)(6)(ii) and(h)(6)(iii) of this section for batch front-end process vents and paragraphs(h)(7)(ii) and (h)(7)(iii) of this section foraggregate batch vent streams.

(2) Emissions from continuous front-end process vents shall be determinedas follows:

(i) Uncontrolled emissions fromGroup 1 continuous front-end processvents, ECFEPV1iu, shall be calculatedaccording to the procedures andequation for ECFEPViu in paragraphs(g)(2)(i) and (g)(2)(ii) of this section.

(ii) Actual emissions from Group 1continuous front-end process ventscontrolled using a technology with anapproved nominal efficiency greaterthan 98 percent or a pollutionprevention measure achieving greaterthan 98 percent emission reduction,ECFEPV1iACTUAL, shall be calculatedusing Equation 42.

ECFEPV ECFEPVNo al efficiency

EqiACTUAL iu1 1 1100%

42= −

[ ]min %.

Where:ECFEPV1iACTUAL = Emissions for each

Group 1 continuous front-endprocess vent i that is controlled toa level more stringent than thereference control technology.

ECFEPV1iu = Emissions from eachGroup 1 continuous front-end

process vent i if the referencecontrol technology had beenapplied to the uncontrolledemissions.

(iii) The following procedures shall beused to calculate actual emissions fromGroup 2 continuous front-end processvents, ECFEPV2iACTUAL:

(A) For a Group 2 continuous front-end process vent controlled by a controldevice, a recovery device applied as apollution prevention project, or apollution prevention measure, wherethe control achieves a percent reductionless than or equal to 98 percentreduction, Equation 43 shall be used.



43= −

[ ].

Where:ECFEPV2iACTUAL=Emissions from each

Group 2 continuousfront-end process vent i that is

controlled.ECFEPV2iu=Emissions from each Group

2 continuous front-end process venti if the reference control technologyhad been applied to theuncontrolled emissions.

(1) ECFEPV2iu shall be calculatedaccording to the equations andprocedures for ECFEPViu in paragraphs

(g)(2)(i) and (g)(2)(ii) of this section, except as provided

in paragraph (h)(2)(iii)(A)(3) of this section.

(2) The percent reduction shall becalculated according to the proceduresin paragraphs (g)(2)(iii)(B)(1) through(g)(2)(iii)(B)(3) of this section, except asprovided in paragraph (h)(2)(iii)(A)(4) ofthis section.

(3) If a recovery device was added aspart of a pollution prevention project,ECFEPV2iu shall be calculated prior tothat recovery device. The equation forECFEPViu in paragraph (g)(2)(ii) of thissection shall be used to calculateECFEPV2iu; however, the sampling sitefor measurement of vent stream flowrate and organic HAP concentration

shall be at the inlet of the recoverydevice.

(4) If a recovery device was added aspart of a pollution prevention project,the percent reduction shall bedemonstrated by conducting aperformance test at the inlet and outletof that recovery device.

(B) For a Group 2 continuous front-end process vent controlled using atechnology with an approved nominalefficiency greater than 98 percent or apollution prevention measure achievinggreater than 98 percent reduction,Equation 44 shall be used.


ECFEPV ECFEPVNo al efficiency


44= −

[ ]min %.

Where:ECFEPV2iACTUAL=Emissions from each

Group 2 continuousfront-end process vent i that is

controlled.ECFEPV2iu=Emissions from each Group

2 continuous front-end process venti if the reference control technology

had been applied to theuncontrolled emissions.

(iv) Emissions from Group 2continuous front-end process vents atbaseline, ECFEPV2iBASE, shall becalculated as follows:

(A) If the continuous front-endprocess vent was uncontrolled onNovember 15, 1990,

ECFEPV2iBASE=ECFEPV2iu and shall becalculated according to the proceduresand equation for ECFEPViu inparagraphs (g)(2)(i) and (g)(2)(ii) of thissection.

(B) If the continuous front-endprocess vent was controlled onNovember 15, 1990, Equation 45 shallbe used.


EqiBASE iu2 2 1100%

45= −

[ ].

(1) ECFEPV2iu is calculated accordingto the procedures and equation forECFEPViu in paragraphs (g)(2)(i) and(g)(2)(ii) of this section.

(2) The percent reduction shall becalculated according to the proceduresspecified in paragraphs (g)(2)(iii)(B)(1)through (g)(2)(iii)(B)(3) of this section.

(C) If a recovery device was added aspart of a pollution prevention projectinitiated after November 15, 1990,ECFEPV2iBASE=ECFEPV2iu, whereECFEPV2iu is calculated according toparagraph (h)(2)(iii)(A)(3) of thissection.

(3) Emissions from storage vesselsshall be calculated using the proceduresspecified in § 63.150(h)(3) of subpart G.

(4) Emissions from back-end processoperations shall be calculated asfollows:

(i) EBEPACTUAL shall be calculatedaccording to the equation forEBEPACTUAL contained in paragraph(g)(4)(i) of this section.

(ii) EBEPc shall be calculatedaccording to the equation for EBEPc

contained in paragraph (g)(4)(ii) of thissection.

(5) Emissions from wastewaterstreams shall be calculated using the

procedures specified in § 63.150(h)(5) ofsubpart G.

(6) Emissions from batch front-endprocess vents shall be determined asfollows:

(i) Uncontrolled emissions fromGroup 1 batch front-end process vents(EBFEPV1iu) shall be calculatedaccording using the proceduresspecified in § 63.488(b).

(ii) Actual emissions from Group 1batch front-end process vents controlledto a level more stringent than thereference control technology(EBFEPV1iACTUAL) shall be calculatedusing Equation 46, where percentreduction is for the batch cycle.

EBFEPV EBFEPVPercent reduction


46= −

[ ].

(A) The percent reduction for thebatch cycle shall be calculatedaccording to the procedures in§ 63.490(c)(2).

(B) The percent reduction for controldevices shall be determined according

to the procedures in § 63.490(c)(2)(i)through (c)(2)(iii).

(C) The percent reduction of pollutionprevention measures shall be calculatedusing the procedures specified inparagraph (j) of this section.

(iii) Actual emissions from Group 2batch front-end process vents

(EBFEPV2iACTUAL) shall be calculatedusing Equation 47 and the procedures inparagraphs (h)(6)(ii)(A) through(h)(6)(ii)(C) of this section. EBFEPV2iu

shall be calculated using the proceduresspecified in § 63.488(b).



47= × −

[ ].

(iv) Emissions from Group 2 batch front-end process vents at baseline shall be calculated as follows:(A) If the batch front-end process vent was uncontrolled on November 15, 1990, EBFEPV2iBASE=EBFEPV2iu and

shall be calculated according to the procedures using the procedures specified in § 63.488(b).(B) If the batch front-end process vent was controlled on November 15, 1990, use Equation 48 and the procedures

in paragraphs (h)(6)(ii)(A) through (h)(6)(ii)(C) of this section. EBFEPV2iu shall be calculated using the procedures specifiedin § 63.488(b).


EqiBASE iu2 2 1100%

48= −

[ ].


(7) Emissions from aggregate batchvent streams shall be determined asfollows:

(i) Uncontrolled emissions fromGroup 1 aggregate batch vent streams(EABV1iu) shall be calculated according

to the procedures and equation forEABViu in paragraphs (g)(7)(i) and(g)(7)(ii) of this section.

(ii) Actual emissions from Group 1aggregate batch vent streams controlledto a level more stringent than the

reference control technology(EABV1iACTUAL) shall be calculatedusing Equation 49.

EABV EABVPercent reduction


49= −

[ ].

(A) The percent reduction for controldevices shall be determined accordingto the procedures in § 63.490(e).

(B) The percent reduction of pollutionprevention measures shall be calculated

using the procedures specified inparagraph (j) of this section.

(iii) Actual emissions from Group 2aggregate batch vents streams(EABV2iACTUAL) shall be calculatedusing Equation 50 and the procedures in

paragraphs (h)(7)(ii)(A) through(h)(7)(ii)(B) of this section. EABV2iu

shall be calculated according to theequations and procedures for EABViu inparagraphs (g)(7)(i) and (g)(7)(ii) of thissection.



50= −

[ ].

(iv) Emissions from Group 2 aggregatebatch vent streams at baseline shall becalculated as follows:

(A) If the aggregate batch vent stream was uncontrolled on November 15, 1990, EABV2iBASE=EABV2iu and shallbe calculated according to the procedures and equation for EABViu in paragraph (g)(7)(i) and (g)(7)(ii) of this section.

(B) If the aggregate batch vent stream was controlled on November 15, 1990, use Equation 51 and the proceduresin paragraphs (h)(7)(ii)(A) through (h)(7)(ii)(B) of this section. EABV2iu shall be calculated according to the equationsand procedures for EABViu in paragraphs (g)(7)(i) and (g)(7)(ii) of this section.


EqiBASE iu2 2 1100%

51= −

[ ].

(i) The following procedures shall befollowed to establish nominalefficiencies for emission controls forstorage vessels, continuous front-endprocess vents, and process wastewaterstreams. The procedures in paragraphs(i)(1) through (i)(6) of this section shallbe followed for control technologies thatare different in use or design from thereference control technologies andachieve greater percent reductions thanthe percent efficiencies assigned to thereference control technologies in§ 63.111 of subpart G.

(1) In those cases where the owner oroperator is seeking permission to takecredit for use of a control technologythat is different in use or design fromthe reference control technology, andthe different control technology will beused in more than three applications ata single plant-site, the owner or operatorshall submit the information specifiedin paragraphs (i)(1)(i) through (i)(1)(iv)of this section to the Director of the EPAOffice of Air Quality Planning andStandards, in writing.

(i) Emission stream characteristics ofeach emission point to which thecontrol technology is or will be applied,including the kind of emission point,flow, organic HAP concentration, andall other stream characteristicsnecessary to design the controltechnology or determine itsperformance.

(ii) Description of the controltechnology, including designspecifications.

(iii) Documentation demonstrating tothe Administrator’s satisfaction thecontrol efficiency of the controltechnology. This may includeperformance test data collected using anappropriate EPA Method or any othermethod validated according to Method301 of appendix A. If it is infeasible toobtain test data, documentation mayinclude a design evaluation andcalculations. The engineering basis ofthe calculation procedures and allinputs and assumptions made in thecalculations shall be documented.

(iv) A description of the parameter orparameters to be monitored to ensure

that the control technology will beoperated in conformance with its designand an explanation of the criteria usedfor selection of that parameter (orparameters).

(2) The Administrator shall determinewithin 120 operating days whether anapplication presents sufficientinformation to determine nominalefficiency. The Administrator reservesthe right to request specific data inaddition to the items listed in paragraph(i)(1) of this section.

(3) The Administrator shall determinewithin 120 operating days of thesubmittal of sufficient data whether acontrol technology shall have a nominalefficiency and the level of that nominalefficiency. If, in the Administrator’sjudgment, the control technologyachieves a level of emission reductiongreater than the reference controltechnology for a particular kind ofemission point, the Administrator willpublish a Federal Register noticeestablishing a nominal efficiency for thecontrol technology.


(4) The Administrator may grantpermission to take emission credits foruse of the control technology. TheAdministrator may also imposerequirements that may be necessary toensure operation and maintenance toachieve the specified nominalefficiency.

(5) In those cases where the owner oroperator is seeking permission to takecredit for use of a control technologythat is different in use or design fromthe reference control technology and thedifferent control technology will beused in no more than three applicationsat a single plant site, the informationlisted in paragraph (i)(1)(i) can besubmitted to the permitting authority forthe affected source for approval insteadof the Administrator.

(i) In these instances, use andconditions for use of the controltechnology can be approved by thepermitting authority as part of anoperating permit application ormodification. The permitting authorityshall follow the procedures specified inparagraphs (i)(2) through (i)(4) of thissection except that, in these instances,a Federal Register notice is not requiredto establish the nominal efficiency forthe different technology.

(ii) If, in reviewing the application,the permitting authority believes thecontrol technology has broadapplicability for use by other sources,the permitting authority shall submitthe information provided in the

application to the Director of the EPAOffice of Air Quality Planning andStandards. The Administrator shallreview the technology for broadapplicability and may publish a FederalRegister notice; however, this reviewshall not affect the permittingauthority’s approval of the nominalefficiency of the control technology forthe specific application.

(6) If, in reviewing an application fora control technology for an emissionpoint, the Administrator or permittingauthority determines that the controltechnology is not different in use ordesign from the reference controltechnology, the Administrator orpermitting authority shall deny theapplication.

(j) The following procedures shall beused for calculating the efficiency(percent reduction) of pollutionprevention measures for storage vessels,continuous front-end process vents,batch front-end process vents, aggregatebatch vent streams, and wastewaterstreams:

(1) A pollution prevention measure isany practice which meets the criteria ofparagraphs (j)(1)(i) and (j)(1)(ii) of thissection.

(i) A pollution prevention measure isany practice that results in a lesserquantity of organic HAP emissions perunit of product released to theatmosphere prior to out-of-processrecycling, treatment, or control of

emissions, while the same product isproduced.

(ii) Pollution prevention measuresmay include substitution of feedstocksthat reduce organic HAP emissions;alterations to the production process toreduce the volume of materials releasedto the environment; equipmentmodifications; housekeeping measures;and in-process recycling that returnswaste materials directly to productionas raw materials. Production cutbacksdo not qualify as pollution prevention.

(2) The emission reduction efficiencyof pollution prevention measuresimplemented after November 15, 1990,can be used in calculating the actualemissions from an emission point in thedebit and credit equations in paragraphs(g) and (h) of this section.

(i) For pollution prevention measures,the percent reduction is used in theequations in paragraphs (g)(2) through(g)(7) of this section and paragraphs(h)(2) through (h)(7) of this section is thepercent difference between the monthlyorganic HAP emissions for eachemission point after the pollutionprevention measure for the most recentmonth versus monthly emissions fromthe same emission point before thepollution prevention measure, adjustedby the volume of product producedduring the two monthly periods.

(ii) Equation 52 shall be used tocalculate the percent reduction of apollution prevention measure for eachemission point.

Percent reduction E

E P

P

EEqB

pp B

pp

B

= −

×( )× [ ]100 52.

where:

Percent reduction=Efficiency ofpollution prevention measure(percent organic HAP reduction).

EB=Monthly emissions before thepollution prevention measure, Mg/month, determined as specified inparagraphs (j)(2)(ii)(A), (j)(2)(ii)(B),and (j)(2)(ii)(C) of this section.

Epp=Monthly emissions after thepollution prevention measure, Mg/month, as determined for the mostrecent month, determined asspecified in either paragraphs(j)(2)(ii)(D) or (j)(2)(ii)(E) of thissection.

PB=Monthly production before thepollution prevention measure, Mg/month, during the same period overwhich EB is calculated.

Ppp=Monthly production after thepollution prevention measure, Mg/month, as determined for the mostrecent month.

(A) The monthly emissions before thepollution prevention measure, EB, shallbe determined in a manner consistentwith the equations and procedures inparagraph (g)(2) of this section forcontinuous front-end process vents,paragraph (g)(3) of this section forstorage vessels, paragraph (g)(6) of thissection for batch front-end processvents, and paragraph (g)(7) of thissection for aggregate batch vent streams.

(B) For wastewater, E B shall becalculated according to§ 63.150(j)(2)(ii)(B) of subpart G.

(C) If the pollution preventionmeasure was implemented prior to

September 5, 1996, records may be usedto determine E B.

(D) The monthly emissions after thepollution prevention measure, E pp, maybe determined during a performance testor by a design evaluation anddocumented engineering calculations.Once an emissions-to-production ratiohas been established, the ratio can beused to estimate monthly emissionsfrom monthly production records.

(E) For wastewater, E pp shall becalculated according to§ 63.150(j)(2)(ii)(E) of subpart G.

(iii) All equations, calculations, testprocedures, test results, and otherinformation used to determine thepercent reduction achieved by apollution prevention measure for eachemission point shall be fullydocumented.


(iv) The same pollution preventionmeasure may reduce emissions frommultiple emission points. In such cases,the percent reduction in emissions foreach emission point must be calculated.

(v) For the purposes of the equationsin paragraphs (h)(2) through (h)(7) ofthis section, used to calculate credits foremission points controlled morestringently than the reference controltechnology, the nominal efficiency of apollution prevention measure isequivalent to the percent reduction ofthe pollution prevention measure. Whena pollution prevention measure is used,the owner or operator of an affectedsource is not required to apply to theAdministrator for a nominal efficiencyand is not subject to paragraph (i) of thissection.

(k) The owner or operator mustdemonstrate that the emissions from theemission points proposed to beincluded in the emissions average willnot result in greater hazard, or at theoption of the Administrator, greater riskto human health or the environmentthan if the emission points werecontrolled according to the provisionsin §§ 63.484, 63.485, 63.486, 63.493, and63.501.

(1) This demonstration of hazard orrisk equivalency shall be made to thesatisfaction of the Administrator.

(i) The Administrator may requireowners and operators to use specificmethodologies and procedures formaking a hazard or risk determination.

(ii) The demonstration and approvalof hazard or risk equivalency shall bemade according to any guidance that theAdministrator makes available for use.

(2) Owners and operators shallprovide documentation demonstratingthe hazard or risk equivalency of theirproposed emissions average in theiroperating permit application or in theirEmissions Averaging Plan if anoperating permit application has not yetbeen submitted.

(3) An Emissions Averaging Plan thatdoes not demonstrate hazard or riskequivalency to the satisfaction of theAdministrator shall not be approved.The Administrator may require suchadjustments to the Emissions AveragingPlan as are necessary in order to ensurethat the emissions average will notresult in greater hazard or risk to humanhealth or the environment than wouldresult if the emission points werecontrolled according to §§ 63.484,63.485, 63.486, 63.493, and 63.501.

(4) A hazard or risk equivalencydemonstration must:

(i) Be a quantitative, bona fidechemical hazard or risk assessment;

(ii) Account for differences inchemical hazard or risk to human healthor the environment; and

(iii) Meet any requirements set by theAdministrator for such demonstrations.

(l) For periods of monitoringexcursions, an owner or operator mayrequest that the provisions ofparagraphs (l)(1) through (l)(4) of thissection be followed instead of theprocedures in paragraphs (f)(2)(i) and(f)(2)(ii) of this section.

(1) The owner or operator shall notifythe Administrator of monitoringexcursions in the Periodic Reports asrequired in § 63.506(e)(6).

(2) The owner or operator shalldemonstrate that other types ofmonitoring data or engineeringcalculations are appropriate to establishthat the control device for the emissionpoint was operating in such a fashion towarrant assigning full or partial creditsand debits. This demonstration shall bemade to the Administrator’s satisfaction,and the Administrator may establishprocedures for demonstratingcompliance that are acceptable.

(3) The owner or operator shallprovide documentation of the excursionand the other types of monitoring dataor engineering calculations to be used todemonstrate that the control device forthe emission point was operating insuch a fashion to warrant assigning fullor partial credits and debits.

(4) The Administrator may assign fullor partial credit and debits upon reviewof the information provided.

(m) For each emission point includedin an emissions average, the owner oroperator shall perform testing,monitoring, recordkeeping, andreporting equivalent to that required forGroup 1 emission points complyingwith §§ 63.484, 63.485, 63.486, 63.493,and 63.501, as applicable. If back-endprocess operations are included in anemissions average, the owner oroperator shall perform testing,monitoring, recordkeeping, andreporting equivalent to that required forback-end process operations complyingwith § 63.493. The specific requirementsfor continuous front-end process vents,batch front-end process vents, aggregatebatch vent streams, storage vessels,back-end process operations, andwastewater are identified in paragraphs(m)(1) through (m)(6) of this section.

(1) For each continuous front-endprocess vent equipped with a flare,incinerator, boiler, or process heater, asappropriate to the control technique:

(i) Determine whether the continuousfront-end process vent is Group 1 orGroup 2 according to the proceduresspecified in § 63.115 of subpart G and asrequired by § 63.485;

(ii) Conduct initial performance teststo determine percent reduction asspecified in § 63.116 of subpart G and asrequired by § 63.485; and

(iii) Monitor the operating parameters,keep records, and submit reports asspecified in § 63.114, § 63.117(a), and§ 63.118(a), (f), and (g) of subpart G, asrequired, for the specific control deviceas required by § 63.485.

(2) For each continuous front-endprocess vent equipped with a carbonadsorber, absorber, or condenser but notequipped with a control device, asappropriate to the control technique:

(i) Determine the flow rate, organicHAP concentration, and TRE indexvalue according to the proceduresspecified in § 63.115 of subpart G; and

(ii) Monitor the operating parameters,keep records, and submit reportsaccording to the procedures specified in§ 63.114, § 63.117(a), and § 63.118 (b),(f), and (g) of subpart G, as required, forthe specific recovery device, and asrequired by § 63.485.

(3) For each storage vessel controlledwith an internal floating roof, externalroof, or a closed vent system with acontrol device, as appropriate to thecontrol technique:

(i) Perform the monitoring orinspection procedures according to theprocedures specified in § 63.120 ofsubpart G, and as required by § 63.484;

(ii) Perform the reporting andrecordkeeping procedures according tothe procedures specified in §§ 63.122and 63.123 of subpart G, and as requiredby § 63.484; and

(iii) For closed vent systems withcontrol devices, conduct an initialdesign evaluation and submit anoperating plan according to theprocedures specified in § 63.120(d) and§ 63.122(a)(2) and (b) of subpart G, andas required by § 63.484.

(4) For back-end process operationsincluded in an emissions average:

(i) If stripping technology, and nocontrol or recovery device, is used toreduce back-end process operationemissions, the owner or operator shallimplement the following portions of thissubpart:

(A) Paragraphs (b)(1), (b)(2), and (b)(3)of § 63.495, paragraph (b) of § 63.498,and the applicable provisions of§ 63.499, or

(B) Paragraphs (c) (1), (2), and (3) of§ 63.495, paragraph (c) of § 63.498, andthe applicable provisions of § 63.499;

(ii) If a control or recovery device isused to reduce back-end processoperation emissions, the owner oroperator shall comply with §§ 63.496,63.497, 63.498(d), and the applicableprovisions of 63.499, and shall


implement the provisions of thesesections.

(5) For wastewater emission points, asappropriate to the control techniques:

(i) For wastewater treatmentprocesses, conduct tests according to theprocedures specified in § 63.138(i) and(j) of subpart G, and as required by§ 63.501;

(ii) Conduct inspections andmonitoring according to the proceduresspecified in § 63.143 of subpart G, andas required by § 63.501;

(iii) Implement a recordkeepingprogram according to the proceduresspecified in § 63.147 of subpart G, andas required by § 63.501; and

(iv) Implement a reporting programaccording to the procedures specified in§ 63.146 of subpart G, and as requiredby § 63.501.

(6) For each batch front-end processvent and aggregate batch vent streamequipped with a control device, asappropriate to the control technique:

(i) Determine whether the batch front-end process vent or aggregate batch ventstream is Group 1 or Group 2 accordingto the procedures specified in § 63.488;

(ii) Conduct performance testsaccording to the procedures specified in§ 63.490;

(iii) Conduct monitoring according tothe procedures specified in § 63.489;and

(iv) Perform the recordkeeping andreporting procedures according to theprocedures specified in §§ 63.491 and63.492.

(7) If an emission point in anemissions average is controlled using apollution prevention measure or adevice or technique for which nomonitoring parameters or inspectionprocedures are required by §§ 63.484,63.485, 63.486, 63.493, or § 63.501, theowner or operator shall submit theinformation specified in § 63.506(f) foralternate monitoring parameters orinspection procedures in the EmissionsAveraging Plan or operating permitapplication.

(n) Records of all informationrequired to calculate emission debitsand credits shall be retained for 5 years.

(o) Precompliance Reports, EmissionAveraging Plans, Notifications ofCompliance Status, Periodic Reports,and other reports shall be submitted asrequired by § 63.506.

§ 63.504 Additional test methods andprocedures.

(a) Performance testing shall beconducted in accordance with § 63.7(a)(3), (d), (e), (g), and (h) of subpart A,with the exceptions specified inparagraphs (a)(1) through (a)(4) of thissection and the additions specified in

paragraph (b) of this section. Sections63.484 through 63.501 also containspecific testing requirements.

(1) Performance tests shall beconducted according to the provisionsof § 63.7(e) of subpart A, except thatperformance tests shall be conducted atmaximum representative operatingconditions for the process.

(2) References in § 63.7(g) of subpartA to the Notification of ComplianceStatus requirements in § 63.9(h) shallrefer to the requirements in§ 63.506(e)(5).

(3) Because the site-specific test plansin § 63.7(c)(3) of subpart A are notrequired, § 63.7(h)(4)(ii) is notapplicable.

(4) The owner or operator shall notifythe Administrator of the intention toconduct a performance test at least 30calendar days before the performancetest is scheduled, to allow theAdministrator the opportunity to havean observer present during the test.

(b) Data shall be reduced inaccordance with the EPA approvedmethods specified in the applicablesubpart or, if other test methods areused, the data and methods shall bevalidated according to the protocol inMethod 301 of appendix A of this part.

§ 63.505 Parameter monitoring levels andexcursions.

(a) Establishment of parametermonitoring levels. The owner oroperator of a control or recovery devicethat has one or more parametermonitoring level requirements specifiedunder this subpart shall establish amaximum or minimum level for eachmeasured parameter using theprocedures specified in paragraph (b),(c), or (d) of this section. The proceduresspecified in paragraph (b) have beenapproved by the Administrator. Theprocedures in paragraphs (c) and (d) ofthis section have not been approved bythe Administrator, and determination ofthe parameter monitoring level usingthe procedures in paragraphs (c) or (d)of this section and is subject to reviewand approval by the Administrator. Thedetermination and supportingdocumentation shall be included in thePrecompliance Report.

(1) The owner or operator shalloperate control and recovery devicessuch that monitored parameters remainabove the minimum established level orbelow the maximum established level.

(2) As specified in § 63.506(e)(5) and§ 63.506(e)(8), all established levels,along with their supportingdocumentation and the definition of anoperating day, shall be approved as partof and incorporated into the Notification

of Compliance Status or operatingpermit, respectively.

(3) Nothing in this section shall beconstrued to allow a monitoringparameter excursion caused by anactivity that violates other applicableprovisions of subparts A, F, or G of thispart.

(b) Establishment of parametermonitoring levels based on performancetests. The procedures specified inparagraphs (b)(1) through (b)(3) of thissection shall be used, as applicable, inestablishing parameter monitoringlevels. Level(s) established under thisparagraph shall be based on theparameter values measured during theperformance test.

(1) Storage tanks and wastewater. Themaximum and/or minimum monitoringlevels shall be based on the parametervalues measured during theperformance test, supplemented, ifdesired, by engineering assessmentsand/or manufacturer’srecommendations.

(2) Continuous front-end processvents and back-end process operationscomplying using control or recoverydevices. During initial compliancetesting, the appropriate parameter shallbe continuously monitored during therequired 1-hour runs. The monitoringlevel(s) shall then be established as theaverage of the maximum (or minimum)point values from the three test runs.The average of the maximum valuesshall be used when establishing amaximum level, and the average of theminimum values shall be used whenestablishing a minimum level.

(3) Batch front-end process vents. Themonitoring level(s) shall be establishedusing the procedures specified inparagraphs (b)(3)(i) through (b)(3)(iii) ofthis section, as appropriate. Theprocedures specified in this paragraphmay only be used if the batch emissionepisodes, or portions thereof, selected tobe controlled were tested, andmonitoring data were collected, duringthe entire period in which emissionswere vented to the control device, asspecified in § 63.490(c)(1)(i). If theowner or operator chose to test only aportion of the batch emission episode,or portion thereof, selected to becontrolled, as specified in§ 63.490(c)(1)(i)(A), the procedures inparagraph (c) of this section must beused.

(i) If more than one batch emissionepisode or more than one portion of abatch emission episode has beenselected to be controlled, a single levelfor the batch cycle shall be calculated asfollows:

(A) During initial compliance testing,the appropriate parameter shall be


monitored continuously at all timeswhen batch emission episodes, orportions thereof, selected to becontrolled are vented to the controldevice.

(B) The average monitored parametervalue shall be calculated for each batchemission episode, or portion thereof, inthe batch cycle selected to be controlled.The average shall be based on all valuesmeasured during the requiredperformance test.

(C) If the level to be established is amaximum operating parameter, the levelshall be defined as the minimum of theaverage parameter values of the batchemission episodes, or portions thereof,in the batch cycle selected to becontrolled.

(D) If the level to be established is aminimum operating parameter, the levelshall be defined as the maximum of theaverage parameter values of the batchemission episodes, or portions thereof,in the batch cycle selected to becontrolled.

(E) Alternatively, an averagemonitored parameter value shall becalculated for the entire batch cyclebased on all values measured duringeach batch emission episode, or portionthereof, selected to be controlled.

(ii) Instead of establishing a singlelevel for the batch cycle, as described inparagraph (b)(3)(i) of this section, anowner or operator may establishseparate levels for each batch emissionepisode, or portion thereof, selected tobe controlled. Each level shall bedetermined as specified in paragraphs(b)(3)(i)(A) and (b)(3)(i)(B) of thissection.

(iii) The batch cycle shall be definedin the Notification of ComplianceStatus, as specified in § 63.506(e)(5).The definition shall include anidentification of each batch emissionepisode and the information required todetermine parameter monitoringcompliance for partial batch cycles (i.e.,when part of a batch cycle isaccomplished during two differentoperating days).

(4) Aggregate batch vent streams. Foraggregate batch vent streams, themonitoring level shall be established inaccordance with paragraph (b)(2) of thissection.

(c) Establishment of parametermonitoring levels based on performancetests, engineering assessments, and/ormanufacturer’s recommendations. Asrequired in paragraph (a) of this section,the information specified in paragraphs(c)(2) and (c)(3) of this section shall beprovided in the Precompliance Report.

(1) Parameter monitoring levelsestablished under this paragraph shallbe based on the parameter values

measured during the performance testsupplemented by engineeringassessments and manufacturer’srecommendations. Performance testingis not required to be conducted over theentire range of expected parametervalues.

(2) The specific level of the monitoredparameter(s) for each emission point.

(3) The rationale for the specific levelfor each parameter for each emissionpoint, including any data andcalculations used to develop the leveland a description of why the levelindicates proper operation of the controlor recovery device.

(d) Establishment of parametermonitoring based on engineeringassessments and/or manufacturer’srecommendations. If a performance testis not required by this subpart for acontrol or recovery device, themaximum or minimum level may bebased solely on engineering assessmentsand/or manufacturer’srecommendations. As required inparagraph (a) of this section, thedetermined level and all supportingdocumentation shall be provided in thePrecompliance Report.

(e) Demonstration of compliance withback-end process provisions usingstripper parameter monitoring. If theowner or operator is demonstratingcompliance with § 63.495 using stripperparameter monitoring, stripperparameter levels shall be established foreach grade in accordance withparagraphs (e)(1) and (e)(2) of thissection. A single set of stripperparameter levels can be representativeof multiple grades.

(1) For each grade, the owner oroperator shall calculate the residualorganic HAP content using theprocedures in paragraphs (e)(1)(i) and(e)(1)(ii) of this section.

(i) The location of the sampling shallbe in accordance with § 63.495(d).

(ii) The residual organic HAP contentin each sample is to be determinedusing specified methods.

(2) For each grade, the owner oroperator shall establish stripperoperating parameter levels thatrepresent stripper operation during theresidual organic HAP contentdetermination in paragraph (e)(1) of thissection. The stripper operatingparameters shall include, at a minimum,temperature, pressure, steaming rates(for steam strippers), and someparameter that is indicative of residencetime.

(3) After the initial determinations, anowner or operator can add a grade, withcorresponding stripper parameter levels,using the procedures in paragraphs(e)(1) and (e)(2) of this section. The

results of this determination shall besubmitted in the next periodic report.

(4) An owner or operator complyingwith the residual organic HAPlimitations in paragraph (a) of § 63.494using stripping, and demonstratingcompliance by stripper parametermonitoring, shall redetermine theresidual organic HAP content for allaffected grades whenever processchanges are made. For the purposes ofthis section, a process change is anyaction that would reasonably beexpected to impair the performance ofthe stripping operation. For thepurposes of this section, examples ofprocess changes may include changes inproduction capacity or production rate,or removal or addition of equipment.For purposes of this paragraph, processchanges do not include: Process upsets;unintentional, temporary processchanges; or changes that reduce theresidual organic HAP content of theelastomer.

(f) Compliance determinations. Theprovisions of this paragraph apply onlyto emission points and control orrecovery devices for which continuousmonitoring is required under thissubpart.

(1) The parameter monitoring data forstorage vessels, front-end process vents,back-end process operations complyingthrough the use of control or recoverydevices, process wastewater streams,and emission points included inemissions averages that are required toperform continuous monitoring shall beused to determine compliance for themonitored control or recovery devices.

(2) Except as provided in paragraph(f)(3) and (i) of this section, for eachexcursion, as defined in paragraphs (g)and (h) of this section, the owner oroperator shall be deemed out ofcompliance with the provisions of thissubpart.

(3) If the daily average value of amonitored parameter is above themaximum level or below the minimumlevel established, or if monitoring datacannot be collected during monitoringdevice calibration check or monitoringdevice malfunction, but the affectedsource is operated during the periods ofstartup, shutdown, or malfunction inaccordance with the affected source’sStartup, Shutdown, and MalfunctionPlan, then the event shall not beconsidered a monitoring parameterexcursion.

(g) Parameter monitoring excursiondefinitions. (1) For storage vessels,continuous front-end process vents,aggregate batch vent streams, back-endprocess operations complying throughthe use of control or recovery devices,and wastewater streams, an excursion


means any of the three cases listed inparagraphs (g)(1)(i) through (g)(1)(iii) ofthis section. For a control or recoverydevice where multiple parameters aremonitored, if one or more of theparameters meets the excursion criteriain paragraphs (g)(1)(i) through (g)(1)(iii)of this section, this is considered asingle excursion for the control orrecovery device.

(i) When the daily average value ofone or more monitored parameters isabove the maximum level or below theminimum level established for the givenparameters.

(ii) When the period of control orrecovery device operation is 4 hours orgreater in an operating day andmonitoring data are insufficient, asdefined in paragraph (g)(1)(iv) of thissection, to constitute a valid hour ofdata for at least 75 percent of theoperating hours.

(iii) When the period of control orrecovery device operation is less than 4hours in an operating day and morethan two of the hours during the periodof operation do not constitute a validhour of data due to insufficientmonitoring data, as defined inparagraph (g)(1)(iv) of this section.

(iv) Monitoring data are insufficient toconstitute a valid hour of data, as usedin paragraphs (g)(1)(ii) and (g)(1)(iii) ofthis section, if measured values areunavailable for any of the 15-minuteperiods within the hour. For datacompression systems approved under§ 63.506(g)(3), monitoring data areinsufficient to calculate a valid hour ofdata if there are less than four datameasurements made during the hour.

(2) For batch front-end process vents,an excursion means one of the two caseslisted in paragraphs (g)(2)(i) and(g)(2)(ii) of this section. For a controldevice where multiple parameters aremonitored, if one or more of theparameters meets the excursion criteriain either paragraph (g)(2)(i) or (g)(2)(ii)of this section, this is considered asingle excursion for the control device.

(i) When the batch cycle daily averagevalue of one or more monitoredparameters is above the maximum orbelow the minimum established levelfor the given parameters.

(ii) When monitoring data areinsufficient. Monitoring data shall beconsidered insufficient when measuredvalues are not available for at least 75percent of the 15-minute periods whenbatch emission episodes, or portionsthereof, selected to be controlled arebeing vented to the control deviceduring the operating day.

(h) Excursion definitions for back-endoperations complying through stripping.(1) For back-end process operations

complying through the use of strippingtechnology, and demonstratingcompliance by sampling, an excursionmeans one of the two cases listed inparagraphs (h)(1)(i) and (h)(1)(ii) of thissection.

(i) When the monthly weightedaverage residual organic HAP content isabove the applicable residual organicHAP limitation in § 63.494; or

(ii) When less than 75 percent of thesamples required in 1 month are takenand analyzed in accordance with theprovisions of § 63.495(b).

(2) For back-end process operationscomplying through the use of strippingtechnology, and demonstratingcompliance by stripper parametermonitoring, an excursion means one ofthe three cases listed in paragraphs(h)(2)(i), (h)(2)(ii), and (h)(2)(iii) of thissection.

(i) When the monthly weightedaverage residual organic HAP content isabove the applicable residual organicHAP limitation in § 63.494;

(ii) When an owner or operator failsto sample and analyze the organic HAPcontent of a sample for a grade with anhourly average stripper operatingparameter value not in accordance withthe established monitoring parameterlevels for that parameter; or

(iii) When an owner or operator doesnot collect sufficient monitoring data forat least 75 percent of the grades orbatches processed during a month.Stripper monitoring data are consideredinsufficient if monitoring parameters areobtained for less than 75 percent of the15-minute periods during the processingof a grade, and a sample of that gradeor batch is not taken and analyzed todetermine the residual organic HAPcontent.

(i) Excused excursions. A number ofexcused excursions shall be allowed foreach control or recovery device for eachsemiannual period. The number ofexcused excursions for each semiannualperiod is specified in paragraphs (i)(1)through (i)(6) of this section. Thisparagraph applies to affected sourcesrequired to submit Periodic Reportssemiannually or quarterly. The firstsemiannual period is the 6-monthperiod starting the date the Notificationof Compliance Status is due.

(1) For the first semiannual period—six excused excursions.

(2) For the second semiannualperiod—five excused excursions.

(3) For the third semiannual period—four excused excursions.

(4) For the fourth semiannualperiod—three excused excursions.

(5) For the fifth semiannual period—two excused excursions.

(6) For the sixth and all subsequentsemiannual periods—one excusedexcursion.

§ 63.506 General recordkeeping andreporting provisions.

(a) Data retention. Each owner oroperator of an affected source shall keepcopies of all applicable records andreports required by this subpart for atleast 5 years, unless otherwise specifiedin this subpart.

(b) Subpart A requirements. Theowner or operator of an affected sourceshall comply with the applicablerecordkeeping and reportingrequirements in 40 CFR part 63, subpartA as specified in Table 1 of this subpart.These requirements include, but are notlimited to, the requirements specified inparagraphs (b)(1) and (b)(2) of thissection.

(1) Startup, shutdown, andmalfunction plan. The owner oroperator of an affected source shalldevelop and implement a writtenstartup, shutdown, and malfunctionplan as specified in § 63.6(e)(3) ofsubpart A. This plan shall describe, indetail, procedures for operating andmaintaining the affected source duringperiods of startup, shutdown, andmalfunction and a program forcorrective action for malfunctioningprocess and air pollution controlequipment used to comply with thissubpart. The affected source shall keepthis plan onsite and shall incorporate itby reference into their operating permit.Records associated with the plan shallbe kept as specified in paragraphs(b)(1)(i)(A) through (b)(1)(i)(D) of thissection. Reports related to the plan shallbe submitted as specified in paragraph(b)(1)(ii) of this section.

(i) Records of startup, shutdown, andmalfunction. The owner or operatorshall keep the records specified inparagraphs (b)(1)(i)(A) through(b)(1)(i)(D) of this section.

(A) Records of the occurrence andduration of each malfunction of airpollution control equipment orcontinuous monitoring systems used tocomply with this subpart.

(B) For each startup, shutdown, ormalfunction, a statement that theprocedures specified in the affectedsource’s startup, shutdown, andmalfunction plan were followed;alternatively, documentation of anyactions taken that are not consistentwith the plan.

(C) For continuous monitoringsystems used to comply with thissubpart, records documenting thecompletion of calibration checks andmaintenance of continuous monitoring


systems that are specified in themanufacturer’s instructions.

(D) Records specified in paragraphs(b)(1)(i)(B) and (b)(1)(i)(C) of this sectionare not required if they pertain solely toGroup 2 emission points that are notincluded in an emissions average.

(ii) Reports of startup, shutdown, andmalfunction. For the purposes of thissubpart, the semiannual startup,shutdown, and malfunction reportsshall be submitted on the same scheduleas the Periodic Reports required underparagraph (e)(6) of this section insteadof the schedule specified in§ 63.10(d)(5)(i) of subpart A. The reportsshall include the information specifiedin paragraphs (b)(1)(i)(A) through(b)(1)(i)(C) of this section and shallcontain the name, title, and signature ofthe owner or operator or otherresponsible official who is certifying itsaccuracy.

(2) Application for approval ofconstruction or reconstruction. For newaffected sources, each owner or operatorshall comply with the provisions in§ 63.5 of subpart A regardingconstruction and reconstruction,excluding the provisions specified in§ 63.5(d)(1)(ii)(H), (d)(1)(iii), (d)(2), and(d)(3)(ii) of subpart A.

(c) Subpart H requirements. Ownersor operators of affected sources shallcomply with the reporting andrecordkeeping requirements in subpartH, except as specified in § 63.502(g)through § 63.502(i).

(d) Recordkeeping anddocumentation. Owners or operatorsrequired to keep continuous recordsshall keep records as specified inparagraphs (d)(1) through (d)(8) of thissection, unless an alternativerecordkeeping system has beenrequested and approved as specified inparagraph (f), (g), or (h) of this section.Documentation requirements arespecified in paragraphs (d)(9) and(d)(10) of this section.

(1) The monitoring system shallmeasure data values at least once every15 minutes.

(2) The owner or operator shall recordeither:

(i) Each measured data value; or(ii) Block average values for 1 hour or

shorter periods calculated from allmeasured data values during eachperiod. If values are measured morefrequently than once per minute, asingle value for each minute may beused to calculate the hourly (or shorterperiod) block average instead of allmeasured values; or

(iii) For batch front-end process vents,each batch cycle average or batchemission episode average, asappropriate, in addition to each

measured data value recorded asrequired in paragraph (d)(2)(i) of thissection.

(3) Daily average (or batch cycle dailyaverage) values of each continuouslymonitored parameter shall be calculatedfor each operating day as specified inparagraphs (d)(3)(i) through (d)(3)(ii) ofthis section, except as specified inparagraph (d)(6) of this section.

(i) The daily average value or batchcycle daily average shall be calculatedas the average of all parameter valuesrecorded during the operating day. Asspecified in § 63.491(e)(2)(i), onlyparameter values measured during thosebatch emission episodes, or portionsthereof, in the batch cycle that theowner or operator has chosen to controlshall be used to calculate the average.The calculated average shall cover a 24-hour period if operation is continuous,or the number of hours of operation peroperating day if operation is notcontinuous.

(ii) The operating day shall be theperiod that the owner or operatorspecifies in the operating permit or theNotification of Compliance Status. Itmay be from midnight to midnight oranother 24-hour period.

(4) Records required when out ofcompliance. If the daily average (orbatch cycle daily average) value of amonitored parameter for a givenoperating day is below the minimumlevel or above the maximum levelestablished in the Notification ofCompliance Status or operating permit,the owner or operator shall retain thedata recorded that operating day underparagraph (d)(2) of this section.

(5) Records required when incompliance for daily average value orbatch cycle daily average value. If thedaily average (or batch cycle dailyaverage) value of a monitored parameterfor a given operating day is above theminimum level or below the maximumlevel established in the Notification ofCompliance Status or operating permit,the owner or operator shall either:

(i) Retain block average values for 1hour or shorter periods for thatoperating day; or

(ii) Retain the data recorded inparagraphs (d)(2)(i) and (d)(2)(iii) of thissection.

(6) Records required when allrecorded values are in compliance. If allrecorded values for a monitoredparameter during an operating day areabove the minimum level or below themaximum level established in theNotification of Compliance Status oroperating permit, the owner or operatormay record that all values were abovethe minimum level or below themaximum level rather than calculating

and recording a daily average (or batchcycle daily average) for that operatingday. For these operating days, therecords required in paragraph (d)(5) ofthis section are required.

(7) Monitoring data recorded duringperiods of monitoring systembreakdowns, repairs, calibration checks,and zero (low-level) and high-leveladjustments shall not be included inany average computed under thissubpart. Records shall be kept of thetimes and durations of all such periods.

(8) In addition to the periods specifiedin paragraph (d)(7) of this section,records shall be kept of the times anddurations of any other periods duringprocess operation or control deviceoperation when monitors are notoperating. For batch front-end processvents, this paragraph only appliesduring batch emission episodes, orportions thereof, that the owner oroperator has selected for control.

(9) For each EPPU that is not part ofthe affected source because it does notuse any organic HAP, the owner oroperator shall maintain thedocumentation specified in§ 63.480(b)(1).

(10) For each flexible operation unitin which the primary product isdetermined to be something other thanan elastomer product, the owner oroperator shall maintain thedocumentation specified in§ 63.480(f)(6).

(e) Reporting and notification. (1) Inaddition to the reports and notificationsrequired by subparts A and H, asspecified in this subpart, the owner oroperator of an affected source shallprepare and submit the reports listed inparagraphs (e)(3) through (e)(8) of thissection, as applicable.

(2) All reports required under thissubpart shall be sent to theAdministrator at the addresses listed in§ 63.13 of subpart A of this part. Ifacceptable to both the Administratorand the owner or operator of a source,reports may be submitted on electronicmedia.

(3) Precompliance Report. Affectedsources requesting an extension forcompliance, or requesting approval touse alternative monitoring parameters,alternative continuous monitoring andrecordkeeping, or alternative controls,shall submit a Precompliance Reportaccording to the schedule described inparagraph (e)(3)(i) of this section. ThePrecompliance Report shall contain theinformation specified in paragraphs(e)(3)(ii) through (e)(3)(vi) of thissection, as appropriate.

(i) Submittal dates. ThePrecompliance Report shall besubmitted to the Administrator no later


than 12 months prior to the compliancedate. For new sources, thePrecompliance Report shall besubmitted to the Administrator with theapplication for approval of constructionor reconstruction required in paragraph(b)(2) of this section.

(ii) A request for an extension forcompliance must be submitted in thePrecompliance Report, if it has not beensubmitted to the operating permitauthority as part of the operating permitapplication. The request for acompliance extension will include thedata outlined in § 63.6(i)(6)(i)(A), (B),and (D) of subpart A, as required in§ 63.481(e)(1).

(iii) The alternative monitoringparameter information required inparagraph (f) of this section shall besubmitted if, for any emission point, theowner or operator of an affected sourceseeks to comply through the use of acontrol technique other than those forwhich monitoring parameters arespecified in this subpart or in subpart Gof this part, or seeks to comply bymonitoring a different parameter thanthose specified in this subpart or insubpart G of this part.

(iv) If the affected source seeks tocomply using alternative continuousmonitoring and recordkeeping asspecified in paragraph (g) of thissection, the information requested inparagraph (e)(3)(iv)(A) or (e)(3)(iv)(B) ofthis section must be submitted in thePrecompliance Report.

(A) The owner or operator mustsubmit notification of the intent to usethe provisions specified in paragraph (h)of this section; or

(B) The owner or operator mustsubmit a request for approval to usealternative continuous monitoring andrecordkeeping provisions as specified inparagraph (g) of this section.

(v) The owner or operator shall reportthe intent to use alternative controls tocomply with the provisions of thissubpart. Alternative controls must bedeemed by the Administrator to beequivalent to the controls required bythe standard, under the proceduresoutlined in § 63.6(g) of subpart A.

(4) Emissions Averaging Plan. For allexisting affected sources usingemissions averaging, an EmissionsAveraging Plan shall be submitted forapproval according to the schedule andprocedures described in paragraph(e)(4)(i) of this section. The EmissionsAveraging Plan shall contain theinformation specified in paragraph(e)(4)(ii) of this section, unless theinformation required in paragraph(e)(4)(ii) of this section is submittedwith an operating permit application.An owner or operator of an affected

source who submits an operating permitapplication instead of an EmissionsAveraging Plan shall submit theinformation specified in paragraph (e)(8)of this section. In addition, asupplement to the Emissions AveragingPlan, as required under paragraph(e)(4)(iii) of this section, is to besubmitted whenever alternative controlsor operating scenarios may be used tocomply with this subpart. Updates tothe Emissions Averaging Plan shall besubmitted in accordance with paragraph(e)(4)(iv) of this section.

(i) Submittal and approval. TheEmissions Averaging Plan shall besubmitted no later than 18 months priorto the compliance date, and is subject toAdministrator approval. TheAdministrator shall determine within120 operating days whether theEmissions Averaging Plan submittedpresents sufficient information. TheAdministrator shall either approve theEmissions Averaging Plan, requestchanges, or request that the owner oroperator submit additional information.Once the Administrator receivessufficient information, theAdministrator shall approve,disapprove, or request changes to theplan within 120 operating days.

(ii) Information required. TheEmissions Averaging Plan shall containthe information listed in paragraphs(e)(4)(ii)(A) through (e)(4)(ii)(M) of thissection for all emission points includedin an emissions average.

(A) The required information shallinclude the identification of allemission points and process back-endoperations in the planned emissionsaverage and, where applicable, notationof whether each storage vessel,continuous front-end process vent,batch front-end process vent, aggregatebatch vents stream, and processwastewater stream is a Group 1 orGroup 2 emission point, as defined in§ 63.482 or as designated under§ 63.503(c)(2).

(B) The required information shallinclude the projected emission debitsand credits for each emission point andthe sum for the emission pointsinvolved in the average calculatedaccording to § 63.503. The projectedcredits must be greater than or equal tothe projected debits, as required under§ 63.503(e)(3).

(C) The required information shallinclude the specific control technologyor pollution prevention measure thatwill be used for each emission pointincluded in the average and date ofapplication or expected date ofapplication.

(D) The required information shallinclude the specific identification of

each emission point affected by apollution prevention measure. To beconsidered a pollution preventionmeasure, the criteria in § 63.503(j)(1)must be met. If the same pollutionprevention measure reduces oreliminates emissions from multipleemission points in the average, theowner or operator must identify each ofthese emission points.

(E) The required information shallinclude a statement that the compliancedemonstration, monitoring, inspection,recordkeeping, and reporting provisionsin § 63.503(m), (n), and (o) that areapplicable to each emission point in theemissions average will be implementedbeginning on or before the date ofcompliance.

(F) The required information shallinclude documentation of the data listedin paragraphs (e)(4)(ii)(F)(1) through(e)(4)(ii)(F)(5) of this section for eachstorage vessel and continuous front-endprocess vent included in the average.

(1) The required documentation shallinclude the values of the parametersused to determine whether the emissionpoint is Group 1 or Group 2. Where aTRE index value is used for continuousfront-end process vent groupdetermination, the estimated ormeasured values of the parameters usedin the TRE equation in § 63.115(d) ofsubpart G and the resulting TRE indexvalue shall be submitted.

(2) The required documentation shallinclude the estimated values of allparameters needed for input to theemission debit and credit calculationsin § 63.503 (g) and (h). These parametervalues shall be specified in the affectedsource’s Emissions Averaging Plan (oroperating permit) as enforceableoperating conditions. Changes to theseparameters must be reported in anupdate to the Emissions Averaging Plan,as required by paragraph (e)(4)(iv)(B)(2)of this section.

(3) The required documentation shallinclude the estimated percent reductionif a control technology achieving alower percent reduction than theefficiency of the applicable referencecontrol technology or standard is or willbe applied to the emission point.

(4) The required documentation shallinclude the anticipated nominalefficiency if a control technologyachieving a greater percent emissionreduction than the efficiency of thereference control technology is or willbe applied to the emission point. Theprocedures in § 63.503(i) shall befollowed to apply for a nominalefficiency.

(5) The required documentation shallinclude the information specified in§ 63.120(d)(2)(i) and in either


§ 63.120(d)(2)(ii) or (d)(2)(iii) of subpartG for each storage vessel controlled witha closed-vent system using a controldevice other than a flare.

(G) The information specified inparagraph (f) of this section shall beincluded in the Emissions AveragingPlan for:

(1) Each continuous front-end processvent controlled by a pollutionprevention measure or controltechnique for which monitoringparameters or inspection procedures arenot specified in § 63.114 of subpart G,and

(2) Each storage vessel controlled bypollution prevention or a controltechnique other than an internal orexternal floating roof or a closed ventsystem with a control device.

(H) The required information shallinclude documentation of the data listedin paragraphs (e)(4)(ii)(H)(1) through(e)(4)(ii)(H)(4) of this section for eachprocess wastewater stream included inthe average.

(1) The required documentation shallinclude the data used to determinewhether the wastewater stream is aGroup 1 or Group 2 wastewater streamand the information specified in table14b of subpart G of this part forwastewater streams at new and existingsources.

(2) The required documentation shallinclude the estimated values of allparameters needed for input to thewastewater emission credit and debitcalculations in § 63.503(g)(5) and (h)(5).These parameter values shall bespecified in the affected source’sEmissions Averaging Plan (or operatingpermit) as enforceable operatingconditions. Changes to these parametersmust be reported as required byparagraph (e)(4)(iv)(B)(2) of this section.

(3) The required documentation shallinclude the estimated percent reductionif:

(i) A control technology that achievesan emission reduction less than or equalto the emission reduction that wouldotherwise have been achieved by asteam stripper designed to thespecifications found in § 63.138(g) ofsubpart G is or will be applied to thewastewater stream, or external floatingroof or a closed vent system with acontrol device.

(ii) A control technology achievingless than or equal to 95 percentemission reduction is or will be appliedto the vapor stream(s) vented andcollected from the treatment processes,or

(iii) A pollution prevention measure isor will be applied.

(4) The required documentation shallinclude the anticipated nominal

efficiency if the owner or operator plansto apply for a nominal efficiency under§ 63.503(i). A nominal efficiency shallbe applied for if:

(i) A control technology that achievesan emission reduction greater than theemission reduction that would havebeen achieved by a steam stripperdesigned to the specifications found in§ 63.138(g) of subpart G, is or will beapplied to the wastewater stream; or

(ii) A control technology achievinggreater than 95 percent emissionreduction is or will be applied to thevapor stream(s) vented and collectedfrom the treatment processes.

(I) For each pollution preventionmeasure, treatment process, or controldevice used to reduce air emissions oforganic HAP from wastewater and forwhich no monitoring parameters orinspection procedures are specified in§ 63.143 of subpart G, the informationspecified in paragraph (f) of this section(Alternative Monitoring Parameters)shall be included in the EmissionsAveraging Plan.

(J) The required information shallinclude documentation of the datarequired by estimated values of allparameters needed for input to theemission debit and credit calculationsin § 63.503 (g) and (h) for each processback-end operation included in anemissions average. These values shall bespecified in the affected source’sEmissions Averaging Plan (or operatingpermit) as enforceable operatingconditions. Changes to these parametersmust be reported as required byparagraph (e)(4)(iv)(B)(2) of this section.

(K) The required information shallinclude documentation of theinformation required by § 63.503(k). Thedocumentation must demonstrate thatthe emissions from the emission pointsproposed to be included in the averagewill not result in greater hazard or, atthe option of the Administrator, greaterrisk to human health or the environmentthan if the emission points were notincluded in an emissions average.

(L) The required information shallinclude documentation of the data listedin paragraphs (e)(4)(ii)(L)(1) through(e)(4)(ii)(L)(3) of this section for eachbatch front-end process vent andaggregate batch vent stream included inthe average.

(1) The required documentation shallinclude the values of the parametersused to determine whether the emissionpoint is Group 1 or Group 2.

(2) The required information shallinclude the estimated values of allparameters needed for input to theemission debit and credit calculationsin § 63.503(g) and (h). These parametervalues shall be specified in the affected

source’s Emissions Averaging Plan (oroperating permit) as enforceableoperating conditions. Changes to theseparameters must be reported as requiredby paragraph (e)(4)(iv) of this section.

(3) For batch front-end process vents,the required documentation shallinclude the estimated percent reductionfor the batch cycle. For aggregate batchvent streams, the requireddocumentation shall include theestimated percent reduction achievedon a continuous basis.

(M) For each pollution preventionmeasure or control device used toreduce air emissions of organic HAPfrom batch front-end process vents orbatch vent streams and for which nomonitoring parameters or inspectionprocedures are specified in § 63.489, theinformation specified in paragraph (f) ofthis section, Alternative MonitoringParameters, shall be included in theEmissions Averaging Plan.

(iii) Supplement to EmissionsAveraging Plan. The owner or operatorrequired to prepare an EmissionsAveraging Plan under paragraph (e)(4)of this section shall also prepare asupplement to the Emissions AveragingPlan for any alternative controls oroperating scenarios that may be used toachieve compliance.

(iv) Updates to Emissions AveragingPlan. The owner or operator of anaffected source required to submit anEmissions Averaging Plan underparagraph (e)(4) of this section shall alsosubmit written updates of the EmissionsAveraging Plan to the Administrator forapproval under the circumstancesdescribed in paragraphs (e)(4)(iv)(A) and(e)(4)(iv)(B) of this section unless therelevant information has been includedand submitted in an operating permitapplication or amendment.

(A) The owner or operator who plansto make a change listed in eitherparagraph (e)(4)(iv)(A)(1) or(e)(4)(iv)(A)(2) of this section shallsubmit an Emissions Averaging Planupdate at least 120 operating days priorto making the change.

(1) An Emissions Averaging Planupdate shall be submitted whenever anowner or operator elects to achievecompliance with the emissionsaveraging provisions in § 63.503 byusing a control technique other thanthat specified in the EmissionsAveraging Plan, or plans to monitor adifferent parameter or operate a controldevice in a manner other than thatspecified in the Emissions AveragingPlan.

(2) An Emissions Averaging Planupdate shall be submitted whenever anemission point or an EPPU is added toan existing affected source and is


planned to be included in an emissionsaverage, or whenever an emission pointnot included in the emissions averagedescribed in the Emissions AveragingPlan is to be added to an emissionsaverage. The information in paragraph(e)(4) of this section shall be updated toinclude the additional emission point.

(B) The owner or operator who hasmade a change as defined in paragraph(e)(4)(iv)(B)(1) or (e)(4)(iv)(B)(2) of thissection shall submit an EmissionsAveraging Plan update within 90operating days after the informationregarding the change is known to theaffected source. The update may besubmitted in the next quarterly periodicreport if the change is made after thedate the Notification of ComplianceStatus is due.

(1) An Emissions Averaging Planupdate shall be submitted whenever aprocess change is made such that thegroup status of any emission point in anemissions average changes.

(2) An Emissions Averaging Planupdate shall be submitted whenever avalue of a parameter in the emissioncredit or debit equations in § 63.503(g)or (h) changes such that it is below theminimum or above the maximumestablished level specified in theEmissions Averaging Plan and causes adecrease in the projected credits or anincrease in the projected debits.

(C) The Administrator shall approveor request changes to the EmissionsAveraging Plan update within 120operating days of receipt of sufficientinformation regarding the change foremission points included in emissionsaverages.

(5) Notification of Compliance Status.For existing and new affected sources, aNotification of Compliance Status shallbe submitted within 150 operating daysafter the compliance dates specified in§ 63.481. The notification shall containthe information listed in paragraphs(e)(5)(i) through (e)(5)(vii) of thissection.

(i) The results of any emission pointgroup determinations, process sectionapplicability determinations,performance tests, inspections,continuous monitoring systemperformance evaluations, any otherinformation used to demonstratecompliance, values of monitoredparameters established duringperformance tests, and any otherinformation required to be included inthe Notification of Compliance Statusunder § 63.122 of subpart G for storagevessels, § 63.117 of subpart G forcontinuous front-end process vents,§ 63.492 for batch front-end processvents, § 63.499 for back-end processoperations, § 63.146 of subpart G for

process wastewater, and § 63.503 foremission points included in anemissions average. In addition, eachowner or operator shall comply withparagraphs (e)(5)(i)(A) and (e)(5)(i)(B) ofthis section.

(A) For performance tests, and groupdeterminations, and process sectionapplicability determinations that arebased on measurements, theNotification of Compliance Status shallinclude one complete test report, asdescribed in paragraph (e)(5)(i)(B) ofthis section, for each test method usedfor a particular kind of emission point.For additional tests performed for thesame kind of emission point using thesame method, the results and any otherrequired information shall be submitted,but a complete test report is notrequired.

(B) A complete test report shallinclude a brief process description,sampling site description, description ofsampling and analysis procedures andany modifications to standardprocedures, quality assuranceprocedures, record of operatingconditions during the test, record ofpreparation of standards, record ofcalibrations, raw data sheets for fieldsampling, raw data sheets for field andlaboratory analyses, documentation ofcalculations, and any other informationrequired by the test method.

(ii) For each monitored parameter forwhich a maximum or minimum level isrequired to be established under§ 63.120(d)(3) of subpart G for storagevessels, § 63.485(k) for continuous front-end process vents, § 63.489 for batchfront-end process vents and aggregatebatch vent streams, § 63.497 for back-end process operations, § 63.143(f) ofsubpart G for process wastewater,§ 63.503(m) for emission points inemissions averages, paragraph (e)(8) ofthis section, or paragraph (f) of thissection, the information specified inparagraphs (e)(5)(ii)(A) through(e)(5)(ii)(E) of this section, unless thisinformation has been established andprovided in the operating permit.

(A) The required information shallinclude the specific maximum orminimum level of the monitoredparameter(s) for each emission point.

(B) The required information shallinclude the rationale for the specificmaximum or minimum level for eachparameter for each emission point,including any data and calculationsused to develop the level and adescription of why the level indicatesproper operation of the control device.

(C) The required information shallinclude a definition of the affectedsource’s operating day, as specified inparagraph (d)(3)(ii) of this section, for

purposes of determining daily averagevalues of monitored parameters.

(D) For batch front-end process vents,the required information shall include adefinition of each batch cycle thatrequires the control of one or morebatch emission episodes during thecycle, as specified in § 63.490(c)(2) and63.505(b)(3)(ii).

(E) The required information shallinclude a definition of the affectedsource’s operating month for thepurposes of determining monthlyaverage values of residual organic HAP.

(iii) For emission points included inan emissions average, the values of allparameters needed for input to theemission credit and debit equations in§ 63.503 (g) and (h), calculated ormeasured according to the proceduresin § 63.503 (g) and (h), and the resultingcalculation of credits and debits for thefirst quarter of the year. The first quarterbegins on the compliance date specified.

(iv) For batch front-end process ventsrequired to establish a batch cyclelimitation under § 63.490(f), the owneror operator must define the 12-monthperiod over which that source’s ‘‘year’’will be said to occur, as required by thedefinition of ‘‘year’’ in § 63.482.

(v) The determination of applicabilityfor flexible operation units as specifiedin § 63.480(f)(6).

(vi) The parameter monitoring levelsfor flexible operation units, and thebasis on which these levels wereselected, or a demonstration that theselevels are appropriate at all times, asspecified in § 63.480(f)(7).

(vii) The results for each predominantuse determination for storage vesselsbelonging to an affected source subjectto this subpart that is made under§ 63.480(g)(6).

(viii) The results for eachpredominant use determination forrecovery operation equipment belongingto an affected source subject to thissubpart that is made under§ 63.480(h)(6).

(ix) For owners and operators ofGroup 2 batch front-end process ventsestablishing a batch cycle limitation, asspecified in § 63.490(f), the affectedsource’s operating year for purposes ofdetermining compliance with the batchcycle limitation.

(6) Periodic Reports. For existing andnew affected sources, each owner oroperator shall submit Periodic Reportsas specified in paragraphs (e)(6)(i)through (e)(6)(xi) of this section.

(i) Except as specified in paragraphs(e)(6)(x) and (e)(6)(xi) of this section, areport containing the information inparagraph (e)(6)(ii) of this section orparagraphs (e)(6)(iii) through (e)(6)(ix) ofthis section, as appropriate, shall be


submitted semiannually no later than 60operating days after the end of each 180day period. The first report shall besubmitted no later than 240 days afterthe date the Notification of ComplianceStatus is due and shall cover the 6-month period beginning on the date theNotification of Compliance Status isdue. Subsequent reports shall covereach preceding 6-month period.

(ii) If none of the complianceexceptions in paragraphs (e)(6)(iii)through (e)(6)(ix) of this sectionoccurred during the 6-month period, thePeriodic Report required by paragraph(e)(6)(i) of this section shall be astatement that the affected source was incompliance for the preceding 6-monthperiod and that none of the activitiesspecified in paragraphs (e)(6)(iii)through (e)(6)(ix) of this sectionoccurred.

(iii) For an owner or operator of anaffected source complying with theprovisions of §§ 63.484 through 63.501for any emission point, Periodic Reportsshall include:

(A) All information specified in§ 63.122(a)(4) of subpart G for storagevessels, §§ 63.117(a)(3) and 63.118(f) ofsubpart G for continuous front-endprocess vents, § 63.492 for batch front-end process vents and aggregate batchvent streams, § 63.499 for back-endprocess operations, § 63.104(b)(4) ofsubpart F for heat exchange systems,and § 63.146(c) through § 63.146(f) ofsubpart G for process wastewater.

(B) The daily average values or batchcycle daily average values of monitoredparameters for all excursions, as definedin § 63.505(g) and § 63.505(h).

(C) The periods when monitoring datawere not collected shall be specified;and

(D) The information in paragraphs(e)(6)(iii)(D)(1) through (e)(6)(iii)(D)(3) ofthis section, as applicable:

(1) Any supplements to the EmissionsAveraging Plan, as required inparagraph (e)(4)(iii) of this section;

(2) Notification if a process change ismade such that the group status of anyemission point changes. Theinformation submitted shall include acompliance schedule, as specified inparagraphs (e)(6)(iii)(D)(2)(i) and(e)(6)(iii)(D)(2)(ii) of this section, foremission points that change from Group2 to Group 1, or for continuous front-end process vents under the conditionslisted in § 63.485(l)(1) through§ 63.485(l)(4), or for batch front-endprocess vents under the conditionslisted in § 63.492 (b) or (c).

(i) The owner of operator shall submitto the Administrator for approval acompliance schedule and a justificationfor the schedule.

(ii) The Administrator shall approvethe compliance schedule or requestchanges within 120 operating days ofreceipt of the compliance schedule andjustification.

(3) Notification if one or moreemission points or one or more EPPU isadded to an affected source. The owneror operator shall submit the informationcontained in paragraphs(e)(6)(iii)(D)(3)(i) through(e)(6)(iii)(D)(3)(iii) of this section.

(i) A description of the addition to theaffected source;

(ii) Notification of the group status ofthe additional emission point or allemission points in the EPPU;

(iii) A compliance schedule, asrequired under paragraph(e)(6)(iii)(D)(2) of this section.

(4) Notification if a standard operatingprocedure, as defined in § 63.500(l), ischanged. This shall also include testresults of the carbon disulfideconcentration resulting from the newstandard operating procedure.

(E) The information in paragraph(b)(1)(ii) of this section for reports ofstartup, shutdown, and malfunction.

(iv) For each batch front-end processvent with a batch cycle limitation, theowner or operator shall include thenumber of batch cycles accomplishedduring the preceding 12-month periodonce per year in a Periodic Report.

(v) If any performance tests arereported in a Periodic Report, thefollowing information shall be included:

(A) One complete test report shall besubmitted for each test method used fora particular kind of emission pointtested. A complete test report shallcontain the information specified inparagraph (e)(5)(i)(B) of this section.

(B) For additional tests performed forthe same kind of emission point usingthe same method, results and any otherinformation required shall be submitted,but a complete test report is notrequired.

(vi) The results for each change madeto a primary product determination foran elastomer product made under§ 63.480(f)(6).

(vii) The results for each change madeto a predominant use determination fora storage vessel belonging to an affectedsource subject to this subpart that ismade under § 63.480(g)(6).

(viii) The results for each changemade to a predominant usedetermination for recovery operationequipment belonging to an affectedsource subject to this subpart that ismade under § 63.480(h)(6).

(ix) The Periodic Report required by§ 63.502(i) shall be submitted as part ofthe Periodic Report required byparagraph (e)(6) of this section.

(x) The owner or operator of anaffected source shall submit quarterlyreports for all emission points includedin an emissions average.

(A) The quarterly reports shall besubmitted no later than 60 operatingdays after the end of each quarter. Thefirst report shall be submitted with theNotification of Compliance Status nolater than 150 days after the compliancedate.

(B) The quarterly reports shall includethe information specified in paragraphs(e)(6)(x)(B)(1) through (e)(6)(x)(B)(7) ofthis section for all emission pointsincluded in an emissions average.

(1) The credits and debits calculatedeach month during the quarter;

(2) A demonstration that debitscalculated for the quarter are not morethan 1.30 times the credits calculatedfor the quarter, as required under§ 63.503(e)(4);

(3) The values of any inputs to thedebit and credit equations in § 63.503(g)and (h) that change from month tomonth during the quarter or that havechanged since the previous quarter;

(4) Results of any performance testsconducted during the reporting periodincluding one complete report for eachtest method used for a particular kind ofemission point as described inparagraph (e)(6)(v) of this section;

(5) Reports of daily average values orbatch cycle daily averages of monitoredparameters for excursions as defined in§ 63.505(g) or (h);

(6) For excursions caused by lack ofmonitoring data, the duration of periodswhen monitoring data were notcollected shall be specified; and

(7) Any other information the affectedsource is required to report under theoperating permit or EmissionsAveraging Plan for the affected source.

(C) § 63.505 shall govern the use ofmonitoring data to determinecompliance for Group 1 and Group 2emission points included in emissionsaverages.

(D) Every fourth quarterly report shallinclude the following:

(1) A demonstration that annualcredits are greater than or equal toannual debits as required by§ 63.503(e)(3); and

(2) A certification of compliance withall the emissions averaging provisionsin § 63.503.

(xi) The owner or operator of anaffected source shall submit quarterlyreports for particular emission pointsand process sections not included in anemissions average as specified inparagraphs (e)(6)(xi)(A) through(e)(6)(xi)(E) of this section.

(A) If requested by the Administrator,the owner or operator of an affected


source shall submit quarterly reports fora period of 1 year for an emission pointor process section that is not includedin an emissions average if either theconditions in paragraph (e)(6)(xi)(A)(1)or (e)(6)(xi)(A)(2) of this section are met.

(1) An emission point has anyexcursions, as defined in § 63.505(g) or§ 63.505(h) for a semiannual reportingperiod.

(2) The process section is out ofcompliance with its applicablestandard.

(B) The quarterly reports shall includeall information specified in paragraphs(e)(6)(iii) and (e)(6)(ix) of this section, asapplicable to the emission point orprocess section for which quarterlyreporting is required under paragraph(e)(6)(ix)(A) of this section. Informationapplicable to other emission pointswithin the affected source shall besubmitted in the semiannual reportsrequired under paragraph (e)(6)(i) of thissection.

(C) Quarterly reports shall besubmitted no later than 60 operatingdays after the end of each quarter.

(D) After quarterly reports have beensubmitted for an emission point for 1year, the owner or operator may returnto semiannual reporting for the emissionpoint or process section unless theAdministrator requests the owner oroperator to continue to submit quarterlyreports.

(E) § 63.505 shall govern the use ofmonitoring data to determinecompliance for Group 1 emissionpoints.

(7) Other reports. Other reports shallbe submitted as specified in paragraphs(e)(7)(i) and (e)(7)(ii) of this section.

(i) For storage vessels, thenotifications of inspections required by§ 63.484 shall be submitted, as specifiedin § 63.122(h)(1) and (h)(2) of subpart G.

(ii) For owners or operators of affectedsources required to request approval fora nominal control efficiency for use incalculating credits for an emissionsaverage, the information specified in§ 63.503(i) shall be submitted.

(iii) For back-end process operationscomplying using control or recoverydevices, the recompliancedetermination report required by§ 63.499(d) shall be submitted within180 days after the process change.

(8) Operating Permit. An owner oroperator who submits an operatingpermit application instead of anEmissions Averaging Plan or aPrecompliance Report shall submit thefollowing information with theoperating permit application:

(i) The information specified inparagraph (e)(4) of this section for

points included in an emissionsaverage; and

(ii) The information specified inparagraph (e)(3) of this section,Precompliance Report, as applicable.

(f) Alternative monitoring parameters.The owner or operator who has beendirected by any section of this subpartto set unique monitoring parameters, orwho requests approval to monitor adifferent parameter than those listed in§ 63.484 for storage vessels, § 63.114 ofsubpart G for continuous front-endprocess vents, § 63.489 for batch front-end process vents and aggregate batchvent streams, § 63.497 for back-endprocess operations, or § 63.143 ofsubpart G for process wastewater shallsubmit the information specified inparagraphs (f)(1) through (f)(3) of thissection in the Precompliance Report, asrequired by paragraph (e)(3) of thissection. The owner or operator shallretain for a period of 5 years each recordrequired by paragraphs (f)(1) through(f)(3) of this section.

(1) The required information shallinclude a description of the parameter(s)to be monitored to ensure the recoverydevice, control device, or pollutionprevention measure is operated inconformance with its design andachieves the specified emission limit,percent reduction, or nominalefficiency, and an explanation of thecriteria used to select the parameter(s).

(2) The required information shallinclude a description of the methodsand procedures that will be used todemonstrate that the parameterindicates proper operation, the schedulefor this demonstration, and a statementthat the owner or operator will establisha level for the monitored parameter aspart of the Notification of ComplianceStatus report required in paragraph(e)(5) of this section, unless thisinformation has already been includedin the operating permit application.

(3) The required information shallinclude a description of the proposedmonitoring, recordkeeping, andrecording system, to include thefrequency and content of monitoring,recordkeeping, and reporting. Further,the rationale for the proposedmonitoring, recordkeeping, andreporting system shall be included ifeither condition in paragraph (f)(3)(i) or(f)(3)(ii) of this section are met:

(i) If monitoring and recordkeeping isnot continuous, or

(ii) If reports of daily average valueswill not be included in Periodic Reportswhen the monitored parameter value isabove the maximum level or below theminimum level as established in theoperating permit or the Notification ofCompliance Status.

(g) Alternative continuous monitoringand recordkeeping. An owner oroperator choosing not to implement thecontinuous parameter operating andrecordkeeping provisions listed in§ 63.485 for continuous front-endprocess vents, § 63.486 for batch front-end process vents and aggregate batchvent streams, § 63.493 for back-endprocess operations, and § 63.501 forwastewater, may instead requestapproval to use alternative continuousmonitoring and recordkeepingprovisions according to the proceduresspecified in paragraphs (g)(1) through(g)(4) of this section. Requests shall besubmitted in the Precompliance Reportas specified in paragraph (e)(3)(iv) ofthis section, if not already included inthe operating permit application, andshall contain the information specifiedin paragraphs (g)(2)(ii) and (g)(3)(ii) ofthis section, as applicable.

(1) The provisions in § 63.8(f)(5)(i) ofsubpart A shall govern the review andapproval of requests.

(2) An owner or operator of anaffected source that does not have anautomated monitoring and recordingsystem capable of measuring parametervalues at least once every 15 minutesand that does not generate continuousrecords may request approval to use anonautomated system with less frequentmonitoring, in accordance withparagraphs (g)(2)(i) and (g)(2)(ii) of thissection.

(i) The requested system shall includemanual reading and recording of thevalue of the relevant operatingparameter no less frequently than onceper hour. Daily average or batch cycledaily average values shall be calculatedfrom these hourly values and recorded.

(ii) The request shall contain:(A) A description of the planned

monitoring and recordkeeping system;(B) Documentation that the affected

source does not have an automatedmonitoring and recording system;

(C) Justification for requesting analternative monitoring andrecordkeeping system; and

(D) Demonstration to theAdministrator’s satisfaction that theproposed monitoring frequency issufficient to represent control deviceoperating conditions, consideringtypical variability of the specific processand control device operating parameterbeing monitored.

(3) An owner or operator may requestapproval to use an automated datacompression recording system that doesnot record monitored operatingparameter values at a set frequency (forexample, once every 15 minutes), butthat records all values that meet setcriteria for variation from previously


recorded values, in accordance withparagraphs (g)(3)(i) and (g)(3)(ii) of thissection.

(i) The requested system shall bedesigned to:

(A) Measure the operating parametervalue at least once every 15 minutes;

(B) Except for the monitoring of batchfront-end process vents, record at leastfour values each hour during periods ofoperation;

(C) Record the date and time whenmonitors are turned off or on;

(D) Recognize unchanging data thatmay indicate the monitor is notfunctioning properly, alert the operator,and record the incident;

(E) Calculate daily average or batchcycle daily average values of themonitored operating parameter based onall measured data; and

(F) If the daily average is not anexcursion, as defined in § 63.505 (g) or(h), the data for that operating day maybe converted to hourly average valuesand the four or more individual recordsfor each hour in the operating day maybe discarded.

(ii) The request shall contain:(A) A description of the monitoring

system and data compression recordingsystem, including the criteria used todetermine which monitored values arerecorded and retained;

(B) The method for calculating dailyaverages and batch cycle daily averages;and

(C) A demonstration that the systemmeets all criteria in paragraph (g)(3)(i) ofthis section.

(4) An owner or operator may requestapproval to use other alternativemonitoring systems according to theprocedures specified in § 63.8(f)(4) ofsubpart A.

(h) Reduced recordkeeping program.For any parameter with respect to anyitem of equipment, the owner oroperator may implement therecordkeeping requirements inparagraph (h)(1) or (h)(2) of this sectionas alternatives to the continuousoperating parameter monitoring andrecordkeeping provisions listed in§ 63.484 for storage vessels, § 63.485 forcontinuous front-end process vents,§ 63.486 for batch front-end processvents and aggregate batch vent streams,§ 63.493 for back-end processes, and§ 63.501 for wastewater. The owner oroperator shall retain for a period of 5years each record required by paragraph(h)(1) or (h)(2) of this section.

(1) The owner or operator may retainonly the daily average or the batch cycledaily average value, and is not requiredto retain more frequent monitoredoperating parameter values, for amonitored parameter with respect to an

item of equipment, if the requirementsof paragraphs (h)(1)(i) through (h)(1)(iv)of this section are met. An owner oroperator electing to comply with therequirements of paragraph (h)(1) of thissection shall notify the Administrator inthe Notification of Compliance Statusor, if the Notification of ComplianceStatus has already been submitted, inthe Periodic Report immediatelypreceding implementation of therequirements of paragraph (h)(1) of thissection.

(i) The monitoring system is capableof detecting unrealistic or impossibledata during periods of operation otherthan startups, shutdowns ormalfunctions (e.g., a temperaturereading of ¥200°C on a boiler), and willalert the operator by alarm or othermeans. The owner or operator shallrecord the occurrence. All instances ofthe alarm or other alert in an operatingday constitute a single occurrence.

(ii) The monitoring system generates,updated at least hourly throughout eachoperating day, a running average of themonitoring values that have beenobtained during that operating day, andthe capability to observe this runningaverage is readily available to theAdministrator on-site during theoperating day. The owner or operatorshall record the occurrence of anyperiod meeting the criteria inparagraphs (h)(1)(ii)(A) through(h)(1)(ii)(C) of this section. All instancesin an operating day constitute a singleoccurrence.

(A) The running average is above themaximum or below the minimumestablished limits;

(B) The running average is based onat least six one-hour periods; and

(C) The running average reflects aperiod of operation other than a startup,shutdown, or malfunction.

(iii) The monitoring system is capableof detecting unchanging data duringperiods of operation other than startups,shutdowns or malfunctions, except incircumstances where the presence ofunchanging data is the expectedoperating condition based on pastexperience (e.g., pH in some scrubbers),and will alert the operator by alarm orother means. The owner or operatorshall record the occurrence. Allinstances of the alarm or other alert inan operating day constitute a singleoccurrence.

(iv) The monitoring system will alertthe owner or operator by an alarm, if therunning average parameter valuecalculated under paragraph (h)(1)(ii) ofthis section reaches a set point that isappropriately related to the establishedlimit for the parameter that is beingmonitored.

(v) The owner or operator shall verifythe proper functioning of the monitoringsystem, including its ability to complywith the requirements of paragraph(h)(1) of this section, at the timesspecified in paragraphs (h)(1)(v)(A)through (h)(1)(v)(C) of this section. Theowner or operator shall document thatthe required verifications occurred.

(A) Upon initial installation.(B) Annually after initial installation.(C) After any change to the

programming or equipment constitutingthe monitoring system, which mightreasonably be expected to alter themonitoring system’s ability to complywith the requirements of this section.

(vi) The owner or operator shall retainthe records identified in paragraphs(h)(1)(vi)(A) through (h)(1)(vi)(C) of thissection.

(A) Identification of each parameter,for each item of equipment, for whichthe owner or operator has elected tocomply with the requirements ofparagraph (h) of this section.

(B) A description of the applicablemonitoring system(s), and howcompliance will be achieved with eachrequirement of paragraphs (h)(1)(i)through (h)(1)(v) of this section. Thedescription shall identify the locationand format (e.g., on-line storage, logentries) for each required record. If thedescription changes, the owner oroperator shall retain both the currentand the most recent supersededdescription.

(C) A description, and the date, of anychange to the monitoring system thatwould reasonably be expected to affectits ability to comply with therequirements of paragraph (h)(1) of thissection.

(2) If an owner or operator has electedto implement the requirements ofparagraph (h)(1) of this section for amonitored parameter with respect to anitem of equipment and a period of 6consecutive months has passed withoutan excursion as defined in paragraph(h)(2)(iv) of this section, the owner oroperator is no longer required to recordthe daily average or batch cycle dailyaverage value, for any operating daywhen the daily average or batch cycledaily average value is less than themaximum, or greater than the minimumestablished limit. With approval by theAdministrator, monitoring datagenerated prior to the compliance dateof this subpart shall be credited towardthe period of 6 consecutive months, ifthe parameter limit and the monitoringaccomplished during the period prior tothe compliance date was required and/or approved by the Administrator.

(i) If the owner or operator elects notto retain the daily average or batch cycle


daily average values, the owner oroperator shall notify the Administratorin the next Periodic Report. Thenotification shall identify the parameterand unit of equipment.

(ii) If, on any operating day after theowner or operator has ceased recordingdaily average or batch cycle dailyaverage values as provided in paragraph(h)(2) of this section, there is anexcursion as defined in paragraph(h)(2)(iv) of this section, the owner oroperator shall immediately resumeretaining the daily average or batchcycle daily average value for eachoperating day and shall notify theAdministrator in the next PeriodicReport. The owner or operator shallcontinue to retain each daily average orbatch cycle daily average value until

another period of 6 consecutive monthshas passed without an excursion asdefined in paragraph (h)(2)(iv) of thissection.

(iii) The owner or operator shall retainthe records specified in paragraphs(h)(1)(i), (h)(1)(ii), and (h)(1)(iv) of thissection, for the duration specified inparagraph (h) of this section. For anycalendar month, if compliance withparagraphs (h)(1)(i) through (h)(1)(iv) ofthis section does not result in retentionof a record of at least one occurrence ormeasured parameter value, the owner oroperator shall record and retain at leastone parameter value during a period ofoperation other than a startup,shutdown, or malfunction.

(iv) For the purposes of paragraph (h)of this section, an excursion means thatthe daily average or batch cycle daily

average value of monitoring data for aparameter is greater than the maximum,or less than the minimum establishedvalue, except as provided in paragraphs(h)(2)(iv)(A) and (h)(2)(iv)(B) of thissection.

(A) The daily average or batch cycledaily average value during any startup,shutdown, or malfunction shall not beconsidered an excursion for purposes ofparagraph (h)(2) of this section, if theowner or operator follows the applicableprovisions of the startup, shutdown, andmalfunction plan required by§ 63.6(e)(3) of subpart A.

(B) An excused excursion, asdescribed in § 63.505(i), shall not beconsidered an excursion for thepurposes of paragraph (h)(2) of thissection.

TABLE 1.—APPLICABILITY OF GENERAL PROVISIONS TO SUBPART U AFFECTED SOURCES

Reference Applies tosubpart U Comment

63.1(a)(1) .......................... Yes .......... § 63.482 of Subpart U specifies definitions in addition to or that supersede definitions in § 63.2.63.1(a)(2)–63.1(a)(3) ........ Yes63.1(a)(4) .......................... Yes .......... Subpart U (this table) specifies the applicability of each paragraph in subpart A to subpart U.63.1(a)(5) .......................... No ............ Reserved.63.1(a)(6)–63.1(a)(8) ........ Yes63.1(a)(9) .......................... No ............ Reserved.63.1(a)(10) ........................ No ............ Subpart U and other cross-referenced subparts specify calendar or operating day.63.1(a)(11) ........................ Yes63.1(a)(12)–63.1(a)(14) .... Yes63.1(b)(1) .......................... Yes .......... § 63.480(a) contains specific applicability criteria.63.1(b)(2) .......................... Yes63.1(b)(3) .......................... No ............ § 63.480(b) of subpart U provides documentation requirements for EPPUs not considered affected

sources.63.1(c)(1) .......................... Yes .......... Subpart U (this table) specifies the applicability of each paragraph in subpart A to subpart U.63.1(c)(2) .......................... No ............ Area sources are not subject to subpart U.63.1(c)(3) .......................... No ............ Reserved.63.1(c)(4) .......................... Yes63.1(c)(5) .......................... Yes .......... Except that affected sources are not required to submit notifications overridden by this table.63.1(d) .............................. No ............ Reserved.63.1(e) .............................. Yes63.2 ................................... Yes .......... § 63.482 of subpart U specifies those subpart A definitions that apply to subpart U.63.3 ................................... Yes63.4(a)(1)–63.4(a)(3) ........ Yes63.4(a)(4) .......................... No ............ Reserved.63.4(a)(5) .......................... Yes63.4(b) .............................. Yes63.4(c) ............................... Yes63.5(a) .............................. Yes63.5(b)(1) .......................... Yes63.5(b)(2) .......................... No ............ Reserved.63.5(b)(3) .......................... Yes63.5(b)(4) .......................... Yes63.5(b)(5) .......................... Yes63.5(b)(6) .......................... No ............ § 63.480(i) of subpart U specifies requirements.63.5(c) ............................... No ............ Reserved.63.5(d)(1)(i) ....................... Yes63.5(d)(1)(ii) ...................... Yes .......... Except that for affected sources subject to subpart U, emission estimates specified in

§ 63.5(d)(1)(ii)(H) are not required.63.5(d)(1)(iii) ..................... No ............ § 63.506(e)(5) of subpart U specifies Notification of Compliance Status requirements.63.5(d)(2) .......................... xlNo.63.5(d)(3) .......................... Yes .......... Except § 63.5(d)(3)(ii) does not apply.63.5(d)(4) .......................... Yes63.5(e) .............................. Yes63.5(f)(1) ........................... Yes63.5(f)(2) ........................... Yes .......... Except that where § 63.5(d)(1) is referred to, § 63.5(d)(1)(i) does not apply.63.6(a) .............................. Yes63.6(b)(1) .......................... Yes


TABLE 1.—APPLICABILITY OF GENERAL PROVISIONS TO SUBPART U AFFECTED SOURCES—Continued


63.6(b)(2) .......................... Yes63.6(b)(3) .......................... Yes63.6(b)(4) .......................... Yes63.6(b)(5) .......................... Yes63.6(b)(6) .......................... No ............ Reserved.63.6(b)(7) .......................... Yes63.6(c)(1) .......................... Yes .......... § 63.481 of subpart U specifies the compliance date.63.6(c)(2) .......................... Yes63.6(c)(3) .......................... No ............ Reserved.63.6(c)(4) .......................... No ............ Reserved.63.6(c)(5) .......................... Yes63.6(d) .............................. No ............ Reserved.63.6(e) .............................. Yes .......... Except the plan, and any records or reports of startup, shutdown and malfunction do not apply to

Group 2 emission points, unless they are included in an emissions average.63.6(f)(1) ........................... Yes63.6(f)(2) ........................... Yes .......... Except that in § 63.6(f)(2)(iii)(D), paragraph 63.7(c) does not apply.63.6(f)(3) ........................... Yes .......... Except that § 63.6(f)(2)(iii)(D) is not applicable.63.6(g) .............................. Yes63.6(h) .............................. No ............ Subpart U does not require opacity and visible emission standards.63.6(i) ................................ Yes .......... Except for § 63.6(i)(15), which is reserved, and except that the requests for extension shall be submit-

ted no later than the date on which the Precompliance Report is required to be submitted in§ 63.506(e)(3)(i).

63.6(j) ................................ Yes63.7(a)(1) .......................... Yes63.7(a)(2) .......................... No ............ § 63.506(e)(5) of subpart U specifies submittal dates.63.7(a)(3) .......................... Yes63.7(b) .............................. No ............ § 63.504(a)(4) of subpart U specifies notification requirements.63.7(c) ............................... No ............ Except if the owner or operator chooses to submit an alternative nonopacity emission standard for ap-

proval under § 63.6(g).63.7(d) .............................. Yes63.7(e) .............................. Yes .......... Except that performance tests must be conducted at maximum representative operating conditions. In

addition, some of the testing requirements specified in subpart U are not consistent with§ 63.7(e)(3).

63.7(f) ............................... No ............ Subpart U specifies applicable test methods and provides alternatives.63.7(g) .............................. Yes .......... Except that references to the Notification of Compliance Status report in 63.9(h) of subpart A are re-

placed with the requirements in § 63.506(e)(5) of subpart U.63.7(h) .............................. Yes .......... Except § 63.7(h)(4)(ii) is not applicable, since the site-specific test plans in § 63.7(c)(3) are not re-

quired.63.8(a)(1) .......................... Yes63.8(a)(2) .......................... No63.8(a)(3) .......................... No ............ Reserved.63.8(a)(4) .......................... Yes63.8(b)(1) .......................... Yes63.8(b)(2) .......................... No ............ Subpart U specifies locations to conduct monitoring.63.8(b)(3)63.8(c)(1)(i) ....................... Yes63.8(c)(1)(ii) ...................... No63.8(c)(1)(iii) ..................... Yes63.8(c)(2) .......................... Yes63.8(c)(3) .......................... Yes63.8(c)(4) .......................... No ............ § 63.505 of subpart U specifies monitoring frequency.63.8(c)(5)–63.8(c)(8) ......... No63.8(d) .............................. No63.8(e) .............................. No63.8(f)(1)–63.8(f)(3) .......... Yes63.8(f)(4)(i) ........................ No ............ Timeframe for submitting request is specified in § 63.506(f) of subpart U.63.8(f)(4)(ii) ....................... No63.8(f)(4)(iii) ...................... No63.8(f)(5)(i) ........................ Yes63.8(f)(5)(ii) ....................... No63.8(f)(5)(iii) ...................... Yes63.8(f)(6) ........................... No ............ Subpart U does not require CEM’s.63.8(g) .............................. No ............ Data reduction procedures specified in § 63.506(d) of subpart U.63.9(a) .............................. Yes63.9(b) .............................. No ............ Subpart U does not require an initial notification.63.9(c) ............................... Yes63.9(d) .............................. Yes63.9(e) .............................. No63.9(f) ............................... No ............ Subpart U does not require opacity and visible emission standards.63.9(g) .............................. No63.9(h) .............................. No ............ § 63.506(e)(5) of subpart U specifies Notification of Compliance Status requirements.


TABLE 1.—APPLICABILITY OF GENERAL PROVISIONS TO SUBPART U AFFECTED SOURCES—Continued


63.9(i) ................................ Yes63.9(j) ................................ No63.10(a) ............................ Yes63.10(b)(1) ........................ Yes63.10(b)(2) ........................ Yes63.10(b)(3) ........................ No ............ § 63.480(b) of subpart U requires documentation of sources that are not affected sources.63.10(c) ............................. No ............ § 63.506 of subpart U specifies recordkeeping requirements.63.10(d)(1) ........................ Yes63.10(d)(2) ........................ No63.10(d)(3) ........................ No ............ Subpart U does not require opacity and visible emission standards.63.10(d)(4) ........................ Yes63.10(d)(5) ........................ Yes .......... Except that reports required by § 63.10(d)(5)(i) shall be submitted at the same time as Periodic Re-

ports specified in § 63.506(e)(6) of subpart U. The startup, shutdown, and malfunction plan, and anyrecords or reports of startup, shutdown, and malfunction do not apply to Group 2 emission pointsunless they are included in an emissions average.

63.10(e) ............................ No63.10(f) ............................. Yes63.10(d)(4) ........................ Yes63.11 ................................. Yes63.12 ................................. Yes63.13 ................................. Yes63.14 ................................. Yes63.15 ................................. Yes

TABLE 2. APPLICABILITY OF SUBPARTS F, G, & H TO SUBPART U AFFECTED SOURCES

Reference Applies Tosubpart U Comment Applicable section

of subpart U

Subpart F

63.100 ....................... No63.101 ....................... Yes .......... Several definitions from 63.101 are incorporated by reference into 63.482 ................. 63.48263.102–63.109 .......... No

Subpart G

63.110 ....................... No63.111 ....................... Yes .......... Several definitions from 63.111 are incorporated by reference into 63.482 ................. 63.48263.112 ....................... No63.113–63.118 .......... Yes .......... With the differences noted in 63.485(b) through 63.485(k) .......................................... 63.48563.119–63.123 .......... Yes .......... With the differences noted in 63.484(c) through 63.484(q) .......................................... 63.48463.124–63.125 .......... No ............ Reserved63.126–63.130 .......... No63.131–63.147 .......... Yes .......... With the differences noted in 63.501(a)(1) through 63.501(a)(8) ................................. 63.50163.148 ....................... Yes .......... With the differences noted in 63.484(c) through 63.484(q) and 63.501(a)(1) through

63.501(a)(8).63.484 and 63.501

63.149 ....................... No ............ Reserved63.150(a) through

63.150(f).No

63.150(g)(1) and63.150(g)(2).

No

63.150(g)(3) ............... Yes .......... ........................................................................................................................................ 63.503(g)(3)63.150(g)(4) ............... No63.150(g)(5) ............... Yes .......... ........................................................................................................................................ 63.503(g)(5)63.150(h)(1) and

63.150(h)(2).No

63.150(h)(3) ............... Yes .......... ........................................................................................................................................ 63.503(h)(3)63.150(h)(4) ............... No63.150(h)(5) ............... Yes .......... ........................................................................................................................................ 63.503(h)(5)63.150(i) through

63.150(o).No

63.151–63.152 .......... No

Subpart H

63.160–63.193 .......... Yes .......... Subpart U affected sources must comply with all requirements of subpart H .............. 63.502


TABLE 3.—GROUP 1 STORAGE VESSELS AT EXISTING AFFECTED SOURCES

Vessel capacity(cubic meters)

Vapor pres-sure a

(kilopascals)

75 ≤ capacity < 151 ................................................................................................................................................................................. ≥13.1151 ≤ capacity .......................................................................................................................................................................................... ≥5.2

a Maximum true vapor pressure of total organic HAP at storage temperature.

TABLE 4.—GROUP 1 STORAGE VESSELS AT NEW SOURCES

Vessel capacity(cubic meters)

Vapor Pres-sure a

(kilopascals)

38 ≤ capacity < 151 ................................................................................................................................................................................. ≥ 13.1151 ≤ capacity .......................................................................................................................................................................................... ≥ 0.7

a Maximum true vapor pressure of total organic HAP at storage temperature.

TABLE 5.—KNOWN ORGANIC HAP FROM ELASTOMER PRODUCTS

Organic HAP/chemical name (CASNo.)

Elastomer Product/Subcategory

BR EPI EPR HBR HYP NEO NBL NBR PBR/SBRS PSR SBL SBRE

Acrylonitrile (107131) ........................ ✔ ✔1,3 Butadiene (106990) .................... ✔ ✔ ✔ ✔ ✔Carbon Tetrachloride (56235) .......... ✔Chlorobenzene (108907) .................. ✔Chloroform (67663) ........................... ✔Chloroprene (126998) ....................... ✔Epichlorohydrin (106898) .................. ✔Ethylbenzene (100414) ..................... ✔ ✔Ethylene Dichloride (75343) .............Ethylene Oxide (75218) .................... ✔ ✔Formaldehyde (50000) ..................... ✔Hexane (100543) .............................. ✔ ✔ ✔ ✔ ✔Methanol (67561) .............................. ✔ ✔Methyl Chloride (74873) ................... ✔ ✔Propylene Oxide (75569) .................. ✔Styrene (100425) .............................. ✔ ✔ ✔Toluene (108883) ............................. ✔ ✔ ✔ ✔ ✔ ✔Xylenes (1330207) ............................ ✔ ✔

AAAACAS No. = Chemical Abstract Service Number.BR = Butyl Rubber.EPI = Epichlorohydrin Rubber.EPR = Ethylene Propylene Rubber.HBR = Halobutyl Rubber.HYP = Hypalon TM.NEO = Neoprene.NBL = Nitrile Butadiene Latex.NBR = Nitrile Butadiene Rubber.PBR/SBRS = Polybutadiene and Styrene Butadiene Rubber by Solution.PSR = Polysulfide Rubber.SBL = Styrene Butadiene Latex.SBR = Styrene Butadiene Rubber by Emulsion or Solution.a Includes mono- and di-ethers of ethylene glycol, diethylene glycol, and triethylene glycol R-(OCH2 CH2)n -OR’ where:n=1,2, or 3;R=alkyl or aryl groups; andR’=R, H, or groups which, when removed, yield glycol ethers with the structure:R-(OCH2 CH2)n-OH

TABLE 6.—GROUP 1 BATCH FRONT-END PROCESS VENTS—MONITORING, RECORDKEEPING, AND REPORTINGREQUIREMENTS

Control/recovery device Parameter to be monitored Recordkeeping and reporting requirements formonitored parameters

Thermal Incinerator ........................................... Firebox temperature a ....................................... 1. Continuous records as specified in§ 63.491(e)(1) b.

2. Record and report the average firebox tem-perature measured during the performancetest—NCS.c


TABLE 6.—GROUP 1 BATCH FRONT-END PROCESS VENTS—MONITORING, RECORDKEEPING, AND REPORTINGREQUIREMENTS—Continued


3. Record the batch cycle daily average fire-box temperature as specified in§ 63.491(e)(2).

4. Report all batch cycle daily average tem-peratures that are below the minimum oper-ating temperature established in the NCS oroperating permit and all instances whenmonitoring data are not collected—PR.d,e

Catalytic Incinerator .......................................... Temperature upstream and downstream of thecatalyst bed.

1. Continuous records as specified in§ 63.491(e)(1).b

2. Record and report the average upstreamand downstream temperatures and the aver-age temperature difference across the cata-lyst bed measured during the performancetest—NCS.c

3. Record the batch cycle daily average up-stream temperature and temperature dif-ference across catalyst bed as specified in§ 63.491(e)(2).

4. Report all batch cycle daily average up-stream temperatures that are below the min-imum upstream temperature established inthe NCS or operating permit—PR.d,e

5. Report all batch cycle daily average tem-perature differences across the catalyst bedthat are below the minimum difference es-tablished in the NCS or operating permit—PR.d,e

6. Report all instances when monitoring dataare not collected.e

Boiler or Process Heater with a design heatinput capacity less than 44 megawatts andwhere the batch front-end process vents oraggregate batch vent streams are not intro-duced with or used as the primary fuel.

Firebox temperature a ....................................... 1. Continuous records as specified in§ 63.491(e)(1).b

2. Record and report the average firebox tem-perature measured during the performancetest—NCS.c

3. Record the batch cycle daily average fire-box temperature as specified in§ 63.491(e)(2).d

4. Report all batch cycle daily average tem-peratures that are below the minimum oper-ating temperature established in the NCS oroperating permit and all instances whenmonitoring data are not collected—PR.d,e

Flare .................................................................. Presence of a flame at the pilot light ............... 1. Hourly records of whether the monitor wascontinuously operating during batch emis-sion episodes selected for control andwhether the pilot flame was continuouslypresent during each hour.

2. Record and report the presence of a flameat the pilot light over the full period of thecompliance determination—NCS.c

3. Record the times and durations of all peri-ods during batch emission episodes when apilot flame is absent or the monitor is notoperating.

4. Report the times and durations of all peri-ods during batch emission episodes se-lected for control when all pilot flames of aflare are absent—PR.d




Scrubber for halogenated batch front-end proc-ess vents or aggregate batch vent streams(Note: Controlled by a combustion deviceother than a flare).

pH of scrubber effluent, and ............................. 1. Continuous records as specified in§ 63.491(e)(1).b

2. Record and report the average pH of thescrubber effluent measured during the per-formance test—NCS.c

3. Record the batch cycle daily average pH ofthe scrubber effluent as specified in§ 63.491(e)(2).

4. Report all batch cycle daily average pH val-ues of the scrubber effluent that are belowthe minimum operating pH established inthe NCS or operating permit and all in-stances when insufficient monitoring dataare collected—PR.d e

Scrubber liquid flow rate ................................... 1. Continuous records as specified in§ 63.491(e)(1).b

2. Record and report the scrubber liquid flowrate measured during the performancetest—NCS.c

3. Record the batch cycle daily average scrub-ber liquid flow rate as specified in§ 63.491(e)(2).

4. Report all batch cycle daily average scrub-ber liquid flow rates that are below the mini-mum flow rate established in the NCS oroperating permit and all instances when in-sufficient monitoring data are collected—PR.d e

Absorber g .......................................................... Exit temperature of the absorbing liquid, and 1. Continuous records as specified in§ 63.491(e)(1).b

2. Record and report the average exit tem-perature of the absorbing liquid measuredduring the performance test—NCS.c

3. Record the batch cycle daily average exittemperature of the absorbing liquid as spec-ified in § 63.491(e)(2) for each batch cycle.

4. Report all the batch cycle daily average exittemperatures of the absorbing liquid that arebelow the minimum operating temperatureestablished in the NCS or operating permitand all instances when monitoring data arenot collected—PR.d e

Absorber f .......................................................... Exit specific gravity for the absorbing liquid ..... 1. Continuous records as specified in§ 63.491(e)(1).b

2. Record and report the average exit specificgravity measured during the performancetest—NCS.

3. Record the batch cycle daily average exitspecific gravity as specified in§ 63.491(e)(2).

4. Report all batch cycle daily average exitspecific gravity values that are below theminimum operating temperature establishedin the NCS or operating permit and all in-stances when monitoring data are not col-lected—PR.d e

Condenser f ....................................................... Exit (product side) temperature ........................ 1. Continuous records as specified in§ 63.491(e)(1).b

2. Record and report the average exit tem-perature measured during the performancetest—NCS.

3. Record the batch cycle daily average exittemperature as specified in § 63.491(e)(2).

4. Report all batch cycle daily average exittemperatures that are above the maximumoperating temperature established in theNCS or operating permit and all instanceswhen monitoring data are not collected—PR.d,e




Carbon Adsorber f ............................................. Total regeneration stream mass flow duringcarbon bed regeneration cycle(s), and.

1. Record of total regeneration stream massflow for each carbon bed regeneration cycle.

2. Record and report the total regenerationstream mass flow during each carbon bedregeneration cycle during the performancetest—NCS.c

3. Report all carbon bed regeneration cycleswhen the total regeneration stream massflow is above the maximum mass flow rateestablished in the NCS or operating per-mit—PR.d e

Carbon Adsorber g ............................................. Temperature of the carbon bed after regenera-tion and within 15 minutes of completingany cooling cycle(s).

1. Record the temperature of the carbon bedafter each regeneration and within 15 min-utes of completing any cooling cycle(s).

2. Record and report the temperature of thecarbon bed after each regeneration andwithin 15 minutes of completing any coolingcycle(s) measured during the performancetest—NCS.c

3. Report all carbon bed regeneration cycleswhen the temperature of the carbon bedafter regeneration, or within 15 minutes ofcompleting any cooling cycle(s), is abovethe maximum temperature established in theNCS or operating permit—PR.d,e

All Control Devices ........................................... Presence of flow diverted to the atmospherefrom the control device or.

1. Hourly records of whether the flow indicatorwas operating during batch emission epi-sodes selected for control and whether flowwas detected at any time during the hour,as specified in § 63.491(e)(3).

2. Record and report the times and durationsof all periods during batch emission epi-sodes selected for control when emissionsare diverted through a bypass line or theflow indicator is not operating—PD.d

All Control Devices ........................................... Monthly inspections of sealed valves ............... 1. Records that monthly inspections were per-formed as specified in § 63.491(e)(4)(i).

2. Record and report all monthly inspectionsthat show the valves are not closed or theseal has been changed—PR.d

Absorber, Condenser, and Carbon Adsorber(as an alternative to the above).

Concentration level or reading indicated by anorganic monitoring device at the outlet ofthe recovery device.

1. Continuous records as specified in§ 63.491(e)(1).b

2. Record and report the average concentra-tion level or reading measured during theperformance test—NCS.

3. Record the batch cycle daily average con-centration level or reading as specified in§ 63.491(e)(2).

4. Report all batch cycle daily average con-centration levels or readings that are abovethe maximum concentration or reading es-tablished in the NCS or operating permitand all instances when monitoring data arenot collected—PR.d,e

a Monitor may be installed in the firebox or in the ductwork immediately downstream of the firebox before any substantial heat exchange is en-countered.

b ‘‘Continuous records’’ is defined in § 63.111 of subpart G.c NCS = Notification of Compliance Status described in § 63.506(e)(5).d PR = Periodic Reports described in § 63.506(e)(6) of this subpart.e The periodic reports shall include the duration of periods when monitoring data are not collected as specified in § 63.506(e)(6)(iii)(C) of this

subpart.f Alternatively, these devices may comply with the organic monitoring device provisions listed at the end of this table.

TABLE 7.—OPERATING PARAMETERS FOR WHICH MONITORING LEVELS ARE REQUIRED TO BE ESTABLISHED FORCONTINUOUS AND BATCH FRONT-END PROCESS VENTS AND AGGREGATE BATCH VENT STREAMS

Control/Recovery device Parameters to be monitored Established operating parameter(s)

Thermal incinerator ........................................... Firebox temperature ......................................... Minimum temperature.


TABLE 7.—OPERATING PARAMETERS FOR WHICH MONITORING LEVELS ARE REQUIRED TO BE ESTABLISHED FORCONTINUOUS AND BATCH FRONT-END PROCESS VENTS AND AGGREGATE BATCH VENT STREAMS—Continued

Control/Recovery device Parameters to be monitored Established operating parameter(s)

Catalytic incinerator .......................................... Temperature upstream and downstream of thecatalyst bed.

Minimum upstream temperature; and minimumtemperature difference across the catalystbed.

Boiler or process heater ................................... Firebox temperature ......................................... Minimum temperature.Scrubber for halogenated vents ....................... Ph of scrubber effluent; and scrubber liquid

flow rate.Minimum pH; and minimum flow rate.

Absorber ............................................................ Exit temperature of the absorbing liquid; andexit specific gravity of the absorbing liquid.

Minimum temperature; and minimum specificgravity.

Condenser ......................................................... Exit temperature ............................................... Maximum temperature.Carbon absorber ............................................... Total regeneration stream mass flow during

carbon bed regeneration cycle; and tem-perature of the carbon bed after regenera-tion (and within 15 minutes of completingany cooling cycle(s)).

Maximum mass flow; and maximum tempera-ture.

Other devices (or as an alternate to theabove) a.

HAP concentration level or reading at outlet ofdevice.

Maximum HAP concentration or reading.

a Concentration is measured instead of an operating parameter.

TABLE 8.—SUMMARY OF COMPLIANCE ALTERNATIVE REQUIREMENTS FOR THE BACK-END PROCESS PROVISIONS

Compliance alternative Parameter to be monitored Requirements

Compliance Using Stripping Technology, Dem-onstrated through Periodic Sampling[§ 63.495(b)].

Residual organic HAP content in each sampleof crumb or latex.

(1) If batch stripping is used, at least one rep-resentative sample is to be taken from everybatch.

(2) If continuous stripping is used, at least onerepresentative sample is to be taken eachoperating day.

Quantity of Material (weight of latex or drycrumb rubber) represented by each sample.

(1) Acceptable methods of determining thisquantity are production records, measure-ment of stream characteristics, and engi-neering calculations.

Compliance Using Stripping Technology, Dem-onstrated through Stripper Parameter Mon-itoring [§ 63.495(c)].

At a minimum, temperature, pressure, steam-ing rates (for steam strippers), and someparameter that is indicative of residencetime..

(1) Establish stripper operating parameter lev-els for each grade in accordance with§ 63.505(e).

(2) Continuously monitor stripper operating pa-rameters.

(3) If hourly average parameters are outside ofthe established operating parameter levels,a crumb or latex sample shall be taken inaccordance with § 63.495(c)(3)(ii).

Determining Compliance Using Control or Re-covery Devices [§ 63.496].

Parameters to be monitored are described inTable 3 of subpart G..

Comply with requirements listed in Table 3 ofsubpart G, except for the requirements forhalogenated vent stream scrubbers.

[FR Doc. 96–21941 Filed 9–4–96; 8:45 am]BILLING CODE 6560–50–P