Final Work Plan Response Interim Removal Actions at the … · 2016. 10. 12. · I--Projectaccountant I--Healthand safety technician I--Foreman l--Equipmentoperator l--Chemist I--Sampletechnician

PCDR \ PCDR3 \ IOWA AAP \041708 \ lWA080113

Final Work Plan

'Rapid Response Interim RemovalActions at the Pesticide Pit and

Explosive Contamination Sumps

April 11, 1995

FINAL WORK PLANFOR RAPID RESPONSE INTERIM REMOVAL

ACTIONS AT THE PESTICIDE PIT ANDEXPLOSIVE CONTAMINATED SUMPS

IOWA ARMY AMMUNITION PLANTCONTRACT NO. DACW45-94-D-0005

DELIVERY ORDER NO. 18

Submitted to:

United States Army Corps of EngineersOmaha, Nebraska

Submitted by:

----- --- --,OHM Remediation Services Corp.

Midwest Region

Prepared by:

erry ResnikProject ManagerMidwest Region

April 11, 1995Project 16544.3

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'hi';;,'{nrmctiu(l is the exclusive property of the party to whom it is addressed. OHM Remediation5e,' ':':es Corp. assumes no responsibility or liability for the reliance hereon or use hereof by anyonevth/.·,·han the party to whom it is addressed. ©J995 OHM Remediation Services Corp.

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TABLE OF CONTENTS

1.0 INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

1.1 SITE HISTORY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11.2 DOCUMENT ORGANIZATION 1-1

FIGURE 1.1, SITE LOCATION MAP................................ 1-2

2.0 SCOPE OF WORK 2-1

2.1 WORK PLAN DEVELOPMENT.................................... 2-12.2 MOBILIZATION/DEMOBILIZATION............................... 2-22.3 SITE PREPARATION AND TEARDOWN . . . . 2-32.4 PESTICIDE PIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-42.5 SUMP REMOVALS.............................................. 2-42.6 WEST RECIRCULATION TANK. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-42.7 PREVIOUSLY REMOVED SUMPS

AND ASSOCIATED EXCAVATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-42.8 TEMPORARY STOCKPILE CONSTRUCTION. . . . . . . . . . . . . . . . . . . . . . . . 2-52.9 TRANSPORTATION AND DISPOSAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-52.10 DEMOBILIZATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-52.11 FINAL REPORT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

3.0 TECHNICAL APPROACH 3-1

3.1 SCHEDULE MONITORING AND CONTROL 3-13.2 PRECONSTRUCTION ACTIVITIES 3-33.3 CONSTRUCTION ACTIVITIES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

FIGURE 3.1, PROJECT SCHEDULE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2FIGURE 3.2, TEMPORARY STOCKPILE CONSTRUCTION. . . . . . . . . . . . . 3-7TABLE 3.1, EPA REGION III RISK BASE CONCENTRATIONS.......... 3-4TABLE 3.2, ESTIMATED SOIL VOLUMES FROM SUMP

EXCA VATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9TABLE 3.3, ACTION LEVELS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-12

4.0 SUBCONTRACTOR MANAGEMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

5.0 PROJECT TEAM AND ORGANIZATION................................. 5-1

6.0 WASTE MANAGEMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

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©1995 OHM Remediation Services Corp. Page i <

TABLE OF CONTENTS (CONTINUED)

6.1 PROCUREMENT OF TRANSPORTATION AND DISPOSAL VENDORS 6-16.2 PROCEDURES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-26.3 PACKAGING, HANDLING, AND CHARACTERIZATION OF

PESTICIDE, RDX (cyclonite), HMX, METALS, AND MERCURY WASTES. . 6-7

6.4 SELECTED TREATMENT, STORAGE, AND DISPOSAL (TSD)FACILITIES 6-7

FIGURE 6.1 CERCLA & RCRA OFF-SITE RESPONSE APPROVAL MEMO. . . . 6-5FIGURE 6.2 T&D FLOW CHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6-10

APPENDIX A - CONTRACTOR SAMPLING AND ANALYSIS PLAN (CSAP)

APPENDIX B - SITE SAFETY AND HEALTH PLAN (SSHP)

APPENDIX C - COMPANY BROCHURES

APPENDIX D - LABORATORY QAlQC PLAN

APPENDIX E - ASBESTOS REMOVAL WORK PLAN

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2.0 SCOPE OF WORK _

This section has been prepared based upon the scope of work (SOW) delineated by thedocument provided to OHM by the USACE entitled:

DRAFf SCOPE OF WORK FOR INTERIM REMOVAL ACTIONS AT THE PESTICIDEPIT AND THE EXPLOSIVE CONTAMINATED SUMPS

The SOW in general encompasses the following tasks:

• Administrative mobilization

• Operational mobilization

• Administration and support

• Site preparation and teardown

• Pesticide pit excavation

• Sump removals

• Removal of the west recirculation tank

• Gathering all materials and decontaminating sumps

• Backfilling

• Decontamination, teardown, and demobilization

• T&D

2.1 WORK PLAN DEVELOPMENT

The project work plan describes how the work will be performed according to the SOW asdelineated by the USACE, environmental industrial standards, construction industrial standards,health and safety requirements, and actual conditions encountered at the site.

The work plan also consists of a SSHP and a CSAP. Site Specific Advance Agreements(SSAA) are included in the Cost Proposal which has been submitted under a separate cover.

The USACE supplied SOW served as the basis for the preparation of this work plan and

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2.0 SCOPE OF WORK

associated documents.

2.2 MOBILIZATIONIDEMOBILIZATION

This task involves the actual transportation of personnel, equipment, materials, and otherresources to and from the project site. Personnel, equipment, and materials will be mobilized anddemobilized from OHM's offices in Chicago, Illinois; St. Louis, Missouri; and Findlay, Ohio. It isanticipated that most of the heavy equipment necessary for this project will be rented locally.

Specific details of the proposed project schedule are discussed in Section 3.1, ScheduleMonitoring and Control.

2.2.1 Personnel

Personnel needed for this project are as follows:

I--Site supervisor

I--Project accountant

I--Health and safety technician

I--Foreman

l--Equipment operator

l--Chemist

I--Sample technician

3--Recovery technicians

1--T&D coordinator

It is anticipated that an administrative team will mobilize to the site prior to operationalmobilization to begin the administrative site preparation and to establish logistical support. Theproject manager will mobilize from Findlay, Ohio, for the initiation of the project and on an asneeded basis. In-house support personnel will be utilized as necessary.

2.2.2 Equipment

Equipment will be mobilized from OHM's offices in Chicago, St. Louis, and Findlay, as wellas rented locally. The major equipment items anticipated to complete this project include anoffice/decontamination trailer, 2-ton stake bed truck with a trailer, two backhoes, a dump truck,

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2.0 SCOPE OF WORK

bobcat loader, Photoionization DetectorlLower Explosive Limit (PIDILEL), portabledecontamination pad, mercury "sniffer", two 3-inch trash pumps, air compressor, cutting torches,computer, and fax machine.

2.2.3 Subcontractors

The primary subcontractors for this project will be T&D, equipment transportation, laboratoryanalysis, and asbestos removal. The mobilization and demobilization of the subcontractors will bemanaged by the OHM project manager in close conjunction with the site supervisory personnel.

A small crew will re-mobilize to the site to load out materials during the T&D phase of theproject. Upon completion of the remediation and T&D phases, the project personnel, equipment,and materials will be demobilized to their respective home offices.

2.3 SITE PREPARATION AND TEARDOWN

The USACE will provide site access, and OHM will secure any permits necessary for on-sitework. Prior to the performance of on-site work, OHM will procure subcontracts and coordinate withlocal hospitals, authorities, and utilities, as necessary. Security clearances for site workers will alsobe provided. This process will continue, as needed, throughout the performance of the project.

The site preparation task includes the placement of the office/decontamination trailer,placement of the decontamination pad, establishment of utilities, coordination with local vendors,and site familiarization.

The portable decontamination pad will be placed in a centralized location and will be used todecontaminate sumps, and heavy equipment. The portable decontamination pad will drain into asump lined with a 55-gallon drum. The sump will be equipped with an electric powered submersiblepump to transfer the decontamination water to a portable holding tank, if necessary. The watertreatment system proposed for treating water in the sumps, west recirculation tank, anddecontamination rinsates will be utilized to reduce the metals concentration of generated waters foracceptance of the effluent by the IAAP tertiary treatment plant. The system will be comprised ofa small chromium reduction tank, if necessary, followed by metals precipitation and clarificationwithin the same tank. The supernatant from this tank will then be passed through a bag filter anddisposable carbon canister and held and tested prior to transportation to the IAAP activated carbontreatment plant.

At the completion of the project, but prior to demobilization, the project site will be inspectedand cleaned. Equipment will be properly cleaned and prepared for demobilization.

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2.0 SCOPE OF WORK

2.4 PESTICIDE PIT

The fence around the pesticide pit will have three sides removed; the side of the fence betweenthe pesticide pit and the Winnebago School House will remain to provide structural security to theschoolhouse and protection for the work crews. The site will be cleared of vegetation usingchainsaws and the backhoe. The perimeter of the pesticide pit will be marked and excavation willcommence utilizing the backhoe. The materials excavated from the pit will be transported to a soilsstaging area. The excavation will be guided using field screening techniques. Upon receipt ofverification analysis that the contamination has been removed, the pit will be backfilled.

2.5 SUMP REMOVALS

The explosive and metal contaminated sumps will be cleaned by IAAP personnel prior toremoval. Piping associated with the sumps will be removed prior to the sump removal. The pipingassociated with the sumps is heavily encrusted with explosive materials. The sumps will beexcavated with a backhoe and by manually. Excavated soils will be transported to the temporaryholding cell after being sampled for characterization analysis. Once removed, the sumps will betransported to the decontamination area, triple-rinsed clean, chip-sampled for characterizationanalysis and transported to the temporary holding cell. Upon receipt of analytical confirmation thateach sump area is free of contamination, the excavation cavities will be backfilled.

2.6 WEST RECIRCULATION TANK

The west recirculation tank will be pumped free of liquids, excavated, and removed to thedecontamination area for cleaning. Any groundwater encountered will be treated for metals, tested,and transported to the IAAP wastewater treatment plant. Upon receipt of confirmation that thecontamination has been removed, the excavation will be backfilled.

2.7 PREVIOUSLY REMOVED SUMPS AND ASSOCIATED EXCAVATIONS

There are a number of previously excavated stainless steel sumps scattered around the facility.Samples of the rainwater collected in the sumps and associated excavation cavities will be sampled,removed, and either treated at the IAAP waste water treatment facility or disposed of off-site. Thestainless steel sumps will be gathered and transported to the decontamination area for cleaning. Theexcavation areas associated with these previously excavated sumps will be sampled. When they areverified to be clean, they will be backfilled. If the sumps area is not verified clean, an additional 6inches of soil in the contaminated area will be excavated and re-tested. The excavations associatedwith the previously removed sumps are simply open holes slightly larger than the sumps that wereremoved. They are open excavations, ready to be sampled.

2.8 TEMPORARY STOCKPILE CONSTRUCTION

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2.0 SCOPE OF WORK

Sumps and associated soils will be stockpiled in a temporary holding cell at a location onIAAP. The bottom of the holding cell will be constructed of a native clay liner. This liner will havea minimum I % degree slope to a leachate collection system. There will be a geotextile separator,a geonet leachate collection and a 60 mil geomembrane liner on the bottom, and a 20 milgeomembrane line on the top covered with 6 to 8 inches of native soil.

Excavated materials from the West Recirculation Tank will be stored separately from the sumpmaterials in a holding cell of similar design and construction.

2.9 TRANSPORTATION AND DISPOSAL

This task involves the T&D of all hazardous and nonhazardous materials generated during thecourse of the performance of the requirements of this project. Section 6.0, Transportation andDisposal, addresses specific T&D options and logic.

2.10 DEMOBILIZATION

This task consists of the physical movement of personnel, equipment, and materials from theproject site back to their respective response centers.

2.11 FINAL REPORT

A final report will be issued within 3 weeks of the completion of the project. The final reportwill contain a summary of the work performed, a narrative of the scope of work performed, andappendices containing all supporting project information and documentation.

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3.0 TECHNICAL APPROACH

OHM's T&D department will submit all relevant supporting documentation such as analyticalreports and material safety data sheets (MSDSs) with the aforementioned documents. These will beaccompanied by a cover letter describing the logic by which OHM arrived at its recommendeddisposal strategy. OHM will not ship any wastes without the prior approval of waste manifests bythe USACE and the IAAP.

The preparation of the final report is discussed in Section 2.10 of this work plan.

3.2 PRECONSTRUCTION ACTIVITIES

Pre-construction activities for this project include the following items:

• Issuing any necessary subcontracts

• Obtaining any necessary permits. i.e. digging if required by the IAAP

• Sourcing OHM internal resources necessary for this project

• Obtaining security clearances for site workers

• Identifying T&D alternatives

OHM understands that the USACE will arrange for any necessary rights of entry.

3.3 CONSTRUCTION ACTIVITIES

The general construction activities that will be performed for this project are as follows:

• Site preparation and setup


• Sump removals

• West recirculation tank removal

• Stockpile soil, sumps and west recirculation tank materials

• Backfill

• Decontamination and teardown

• T&D

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3.3.1 Site Preparation and Set-up

Site preparation includes the placement of the support trailers and the establishment of supportzones, decontamination stations, and exclusion zones. Other activities will be the establishment ofutilities and familiarization with the site.

It is anticipated that the exclusion zone will be the various excavations. These areas will varyin size depending upon the size of the individual excavation. In the area of the pesticide pit, thedecontamination station will be placed immediately adjacent to the exclusion zone. Thedecontamination station will consist of a portable decontamination pad which will be used todecontaminate any heavy equipment leaving the exclusion zone. The decontamination pad isconstructed of steel and has a raised lip to prevent any rinse waters from leaving the pad. The padis rectangular in shape and sloped toward the middle to provide for the collection of thedecontamination rinse water. The decontamination pad will drain rinsate waters into a sump linedwith a 55-gallon drum which will be equipped with an electrical submersible pump. Thedecontamination rinsates will be pumped into a temporary holding tank if necessary.

3.3.2 Pesticide Pit Excavation

The fence around the pesticide pit will be removed on three sides for ease of access. The fenceclosest to the Winnebago School House will remain standing to protect the school and the workersin the pesticide pit area. The pesticide pit area will then be cleared and grubbed using the backhoeand chainsaws. The perimeter of the pesticide pit will be marked, and excavation will commenceusing a backhoe. Soil will be placed in lined, covered roll-offs pending T&D. Field screeningtechniques (immunoassay) will be used to determine the extent of contamination. Upon receipt ofanalytical confirmation that the excavation is free of contamination, the excavation will be backfilledand compacted in loose lift thicknesses of no more than 12 inches and compacted to at least 85percent of maximum density. After 6 inches of topsoil are placed the area will be reseeded. At alltimes when the excavation is open and no work is proceeding in the area, the excavation will bebarricaded and marked with caution taped to prevent unrestricted access. The excavation will bekept free of excessive water at all times. The excavation will be approximately 10 feet deep, andsamples will be taken from the bucket of the backhoe. It is not anticipated that personnel will needto enter the excavation. The action levels established for the pesticide pit are presented in Table 3.1.

TABLE 3.1EPA REGION III RISK BASE CONCENTRATIONS

Pesticide Commercial (mWk~)

DDD 12.0

DDT 8.4

I

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DDE 8.4

Endrin 310.0

Chlordane 2.2

Heptachlor 0.64

3.3.3 Sump Removals

There are 36 concrete sumps of concern, five of which are located under ramps and encasedin concrete. There are also seven stainless steel sumps and nine previously excavated stainless steelsumps. The sumps range in size from 2 feet by 2 feet to 14 feet by 20 feet. Some of the sumps areaccessible by machine, others will have to be removed primarily by hand. The excavations willrange in depth from approximately 1- to 6-feet deep. Samples will primarily be gathered with thebackhoe. If it is necessary for personnel to enter any excavations, the excavation will be sloped to1.5: 1 degree.

Some of the sumps contain explosives contamination, and it is assumed that some of the sumpshave only metals contamination. Sumps 13 and 32 will be handled separately due to the presenceof mercury. Any other sumps where mercury is found will be handled separately along with Sumps13 and 32. IAAP personnel are unaware of the source of the mercury.

Sumps will be cleaned by IAAP personnel prior to removal. All liquids in any of the sumpswill be removed prior to commencing any excavations. The water treatment system proposed fortreating water in the west recirculation tank and decontamination rinsates will be utilized to reducethe metals concentration of generated waters for acceptance of the effluent by the IAAP tertiarytreatment plant. The system will be comprised of a small chromium reduction tank, if necessary,followed by metals precipitation and clarification within the same tank. The supernatant from thistank will then be passed through a bag filter and disposable carbon canister and held and tested priorto transportation to the IAAP activated carbon treatment plant. Prior to removing sumps, theexisting piping will be removed. It is known that some of the piping is heavily encrusted withexplosive materials. Piping will be removed slowly, methodically and carefully using a wheel cutter( pipe cutter). Cutting fluid will be used copiously and pipe temperature in the immediate area ofthe cut will be monitored continuously. There will be two crews working concurrently on the sumpremovals. The first two-person crew will remove the sumps that are accessible with a backhoe.These sumps will be transported to the decontamination area, triple-rinsed clean, chip-sampled forcharacterization analysis, and transported to the temporary stockpile location. Sump excavations willinitially be guided using field screening techniques using immunoassay test kits for explosives. Allsoils temporarily stored will be segregated by wastestream. The sumps will be transported to thedecontamination area. After a sump has been excavated, confirmatory samples will be taken of theexcavation and sent for laboratory analysis on a 5- or 7-day turnaround basis. The open excavationswill be barricaded and marked with caution tape to prevent unrestricted access. Excavations will bebermed to prevent water from flowing into the excavation. Once an excavation has been confirmedclean, the excavation will be backfilled and compacted according to specifications and the area

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reseeded.

Sumps with limited access will be removed by a two-person crew utilizingjackharnmers and/ora Bobcat type loader. The soils and sumps removed will be temporarily staged on visqueen near theexcavations and will be transported to the temporary stockpile location and the decontaminationarea, respectively. Transportation will occur in a relatively short time frame and will be dictated bythe availability of equipment at the project site. Materials excavated from the sumps will beseparated into two separate waste streams. Waste streams will be based on whether or not mercuryis present in the material. Material with mercury contamination will be disposed of off site.Materials with no mercury contamination will be stockpiled near the IAAP landfill. The bottomliner will consist of a 60 mil geomembrane with a clay layer. The bottom liner will have a minimumslope of 1% and will slope to a leachate collection sump. The bottom liner will also have ageotextile separator and a geonet leachate collection layer. The pile will be covered with 20 milgeomembrane and a 6 to 8 inch soil covering. The top cover will have a maximum slope of 5H: 1Vand a minimum slope of 5%. Figure 3.2 illustrates the stockpile construction. It should be notedthat some of the sumps removed with jack hammers will be at least partially destroyed duringremoval and become part of the debris wastestream.

There are five sumps encased in concrete underneath ramps. At this time, the plan for thesefour sumps is to access them with jackhammers, clean the sumps, and abandon them in place byfilling them with a non-shrink grouting material. Any contaminated soil encountered will beexcavated to the extent possible without affecting the structural integrity of the ramp foundations.This approach has been chosen because it will result in the least amount of compromise to thestructural integrity of the concrete ramps.

As personnel and equipment become available from the sump removal task, the previouslyexcavated sumps will be transported to the decontamination area for cleaning prior to release to theIAAP. The previously removed sumps are stainless steel and were removed by IAAP personnel.

The asbestos piping will be removed by a licensed-Iowa subcontractor in accordance with allfederal, state, and local regulatory requirements. This task will begin concurrently with the pesticidepit removal to ensure that sumps are available to be removed when personnel and equipment becomeavailable. The specific asbestos work plan is attached to the asbestos subcontractor's quotation.

During the pesticide pit removal, a sampling crew will take samples from the previouslyremoved sumps to determine whether to backfill or further excavate these areas. This sampling crewwill also work concurrently with the sump excavation crews, field screening the excavations andgathering confirmatory samples. This methodology will ensure that the excavations can bebackfilled and compacted in the shortest amount of time.

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60 MIL GEOMEMBRANE LINER

--...........CAt Notes:

1----

MAXIMUM SLOPE, 5H:1 VMINIMUM SLOPE, 5%

LEACHATECOLLECTION

SUMP

GEONET LEACHATE COLLECTION LAYER

GEOTEXTILE SEPARATOR

GEOMEMBRANE

CLAY LINERMINIMUM SLOPE 1·

.....

TYPICAL CROSS SECTION

REMOVABLE COVER


55 GALLONPOLY TANK

t:STOCKPILE 20 MIL GEOMEMBRANE LINER


60 MIL GEOMEMBRANE LINER<8

OHM CorporationFindlay. Ohio

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to-'a.

LEACHATE COLLECTION SUMP DETAIL

I/rifMl f'4: Cfoecked 1'Ij:

L-OrlMANNI/ate: }\wroved ~:

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5cale: I/raN~ No:Nf5 16S44Al .


Table 3.2 shows the estimated quantities of contaminated soil to be removed for the varioussumps and the west recirculation tank. These are only estimates, and the actual quantities will bedetermined by field screening and analytical results. It should be noted that the excavations fromthe previously excavated sumps are assumed to not be contaminated; however, the excavations willbe screened to determine if additional excavation is necessary. Confirmation sampling will beperformed prior to backfilling excavations.

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TABLE 3.2ESTIMATED SOIL VOLUMES FROM SUMP EXCAVATIONS

Sump Exeavation Quantity ofSoil CommentsNo. Perimeter (in cubic yards)

1 6-inch 5 The contamination primarily exists at thesurface of this sump.

2 6-inch 3 Contamination primarily exists at thenortheast corner of the sump. Minimalsurface contamination.

3 2-foot 16 Contamination exists at the northwest cornerand at the southeast corner form the surfacedown to an estimated depth of two feet.

4 6-inch 6 Contamination exists at the surface at thenorthwest corner and at the southeast corner.The topography slopes from the northwest tothe southeast.

8 I-foot 18 Contamination exists around the entire sumpdown to a depth of 3.5 feet.

9 2-foot 14 Contamination exists at the surface andsubsurface of the entire sump.

10 2-foot 14 Contamination exists at the entire surface ofthe sump and down to a depth of 3 feet.


13 2-foot 19 Contamination exists at the surface of theentire sump down to a depth of 3 feet (Highlevels of mercury).

14 2-foot 10 Contamination exists at the surface of theentire sump down to a depth of 3 feet.


16 6-inch 2 Contamination exists at the north and southsides of the sump down to a depth of 3 feet.

17 6-inch 2' Contamination exists at the northeast andsouthwest corners of the sump down to 3 feet.


Project 16544Revision 3AprillJ, 1995

3.0 TECHNfCALAPPROACH

19 6-inch 4 Contamination exists on the east and westsides of the sump down to 3 feet.

22 6-inch 1 Contamination exists at the surface at thesouthwest corner.

23 6-inch 1 Contamination exists at the outfall pipe and aditch west of the sump down to 1.5 feet.

24 6-inch 1 Contamination exists at the surface on theeast and west sides of the sump.


26 6-inch 1 Contamination exists on the west side of thesump down to a depth of 2 feet.

27 6-inch 1 Contamination exists at the surface on thenorth and south sides of the sump.

28 2-foot 4 Contamination exists at the north and southsides of the sump down to depth of 2 feet.

29 6-inch 1 Contamination exists on the west and eastside of the sump down to a depth of 2.5 feet.

30 I-foot 1 Contamination exists at the surface on thewest and east side and down to 2 feet on thewest side.

31 6-inch 1 Contamination exists down to 2 feet on thewest side of the sump and at the surface in alow area southeast of the sump.

32 2-foot 5 Contamination exists down to 2.5 feet at thenorthwest corner of the sump.

34 6-inch 1 Contamination exists at the northwest cornerof the sump down to 2 feet. Surfacecontamination exists on the east side of thesump.

35 6-inch 1 Contamination exists down to 3 feet on thenorth side of the sump. Surfacecontamination exists on the south side.

36 6-inch 1 Contamination exists down to 2.5 feet on boththe east and west sides of the sumo.

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3.0 TECHN1CAL APPROACH

37 6-inch 3

38 6-inch 1

39 6-inch 1

40 6-inch 1

41 6-inch 3

42 6-inch 3

43 6-inch 4

44 6-inch 4

West 3-foot 96Recric.Tank

Total 273

*Note: Sump Numbers 37-44 do not have associated analytical data.

3.3.4 West Recirculation Tank

The west recirculation tank is approximately 22 feet long and 10 feet in diameter. The tankcontains baffling and piping and is approximately half buried (horizontally) in the ground.Groundwater has intruded into the tank and at the time of the site visit had filled approximately halfof the buried portion of the tank. The excavation will be approximately 3 feet deep, and samples willbe taken from the backhoe bucket.

The tank atmosphere will be measured and continuously monitored with an LELlOz meterduring operations. The groundwater will be transported to the water treatment system to reduce themetals concentration prior to transportation to the IAAP wastewater treatment plant. In the eventthat the IAAP wastewater treatment plant is unable to handle the volume of water generated,provisions will be made to temporarily store the water. If water storage is necessary, a 12,OOO-gallonportable pool will be used.

As the tank is being dewatered, it will be cut into pieces using plasma arc cutting torches. Thepieces of the tank, baffling, and associated piping will be temporarily staged on visqueen andsubsequently hauled to the decontamination area.

Once the tank and its components have been removed, any contaminated soil will be excavated.Because of the hydraulic flushing of the tank by groundwater, it has been assumed that a 3-footperimeter around the tank will need to be excavated due to contamination. This soil will be stagedand sampled to determine if contamination is present. This soil will be stored adjacent to, and in the

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same manner as, the sump material. Samples will be taken of the excavation area after fieldscreening has been performed and the excavation area backfilled upon receipt of confirmation thatthe contamination has been removed. The action levels for the west recirculation tank are the sameas the sumps listed in Table 3.3. As with all open excavations, when work is not being performedin the area, the excavation area will be barricaded and encircled with caution tape. It should be notedthat USACE compaction specifications may not be achieved due to the intrusion of groundwater.

TABLE 3.3ACTION LEVELS

Contaminants SoU (mg/kg) Water (mg/L)

HMX 51,000** 5.1*

RDX 53* 0.002*

2,4,6-TNT 196* 0.0095*

1,3,5-TNB 102* 0.005*

2,6-DNT 8.7 0.00042*

2,4-DNT 8.7* 0.00042*

Nitrobenzene 510** 0.05*

Cadmium 510** 0.05*

Copper 38,000** 1,400**

Lead 500 0.005

Chromium 5,100** 0.005*

Silver 5,100** 0.5*

Antimony 816* 0.04*

Mercury 310** 0.031 *

Barium 72,000** 7.1 *

Nickel 20,000** 2*

Tetryl 10,000** 1*

Arsenic 3.4* 0.00016*

* PROSs calculated at IAAP.** From Risk-Based Concentration Table, Region III.

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Project 16544Revision 3April]]. ]995

'f!


ACTIONS AT THE PESTICIDE PIT ANDEXPLOSIVE CONTAMINATED SUMPS

IOWA ARMY AMMUNITION PLANTCONTRACT NO. DACW45-94-D-0005

DELIVERY ORDER NO. 18

Sul?mitted to:

United States Army Corps of EngineersQm.~ba,~Nebraska

Submitted by:

..4::,).=':; ~ ..:,,

OHM Remediation Services Corp.Midwest Region

Prepared by:

erry Resnik Project ManagerMidwest Region

April 11, 1995 Project 16544.3

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Thi1 information is the exclusive property of the part)' to whom it is addressed, OHM Remediatil'mSe"'es Corp, assumes no responsibility or liabilit)' for the reliance hereon or use hereofby anyoneothe/than the party to whom it is addressed, ©1995 OHM Remediation Services Corp,

TABLE OF CONTENTS

1.0 INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-I

1.1 SITE HISTORY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-I1.2 DOCUMENT ORGANIZATION I-I

FIGURE 1.1, SITE LOCATION MAP. . .. . . . .. . . . . . . . . . . . . . .. . . . . . . . . 1-2

2.0 SCOPE OF WORK 2-1

2.1 WORK PLAN DEVELOPMENT.................................... 2-12.2 MOBILIZATION/DEMOBILIZATION............................... 2-22.3 SITE PREPARATION AND TEARDOWN . . . . . . . 2-32.4 PESTICIDE PIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-42.5 SUMP REMOVALS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-42.6 WEST RECIRCULATION TANK. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-42.7 PREVIOUSLY REMOVED SUMPS

AND ASSOCIATED EXCAVATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-42.8 TEMPORARY STOCKPILE CONSTRUCTION........................ 2-52.9 TRANSPORTATION AND DISPOSAL............................... 2-52.10 DEMOBILIZATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-52.ll FINAL REPORT . . . . . . .. . . . .. . . . .. . . . . . . . . . . . . . . . . .. . . . . . . . . .. . . 2-5

3.0 TECHNICAL APPROACH 3-1

3.1 SCHEDULE MONITORING AND CONTROL 3-13.2 PRECONSTRUCTION ACTIVITIES 3-33.3 CONSTRUCTION ACTIVITIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

FIGURE 3.1, PROJECT SCHEDULE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2FIGURE 3.2, TEMPORARY STOCKPILE CONSTRUCTION. . . . . . . . . . . . . 3-7TABLE 3.1, EPA REGION III RISK BASE CONCENTRATIONS. .. . . . . . . . 3-4TABLE 3.2, ESTIMATED SOIL VOLUMES FROM SUMP

EXCAVATIONS.......................................... 3-9TABLE 3.3, ACTION LEVELS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-12

4.0 SUBCONTRACTOR MANAGEMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

5.0 PROJECT TEAM AND ORGANIZATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

•6.0 WASTE MANAGEMENT.............................................. 6-1

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TABLE OF CONTENTS (CONTINUED) 72-.6.1 PROCUREMENT OF TRANSPORTATION AND DISPOSAL VENDORS 6-16.2 PROCEDURES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-26.3 PACKAGING, HANDLING, AND CHARACTERIZATION OF

PESTICIDE, RDX (cyclonite), HMX, METALS, AND MERCURY WASTES. . 6-7

6.4 SELECTED TREATMENT, STORAGE, AND DISPOSAL (TSD)FACILITIES 6-7

FIGURE6.1 CERCLA & RCRA OFF-SITE RESPONSE APPROVAL MEMO 6-5F1GURE6.2 T&DFLOWCHART 6-10

APPENDIX A - CONTRACTOR SAMPLING AND ANALYSIS PLAN (CSAP)

APPENDIX B - SITE SAFETY AND HEALTH PlAN (SSHP)

APPENDIX C - COMPANY BROCHURES

APPENDIX D -LABORATORY QAlQC PLAN

APPENDIX E - ASBESTOS REMOVAL WORK PLAN

©J995 OHM Remediation Services Corp. Page ii <

2.0 SCOPE OF WORK _

This section has been prepared based upon the scope of work (SOW) delineated by thedocument provided to OHM by the USACE entitled:

DRAFf SCOPE OF WORK FOR INTERIM REMOVAL ACTIONS AT THE PESTICIDEPIT AND THE EXPLOSIVE CaNTAMINATED SUMPS

The SOW in general encompasses the following tasks:

• Administrative mobilization

• Operational mobilization

• Administration and support

• Site preparation and teardown


• Sump removals

• Removal of the west recirculation tank

• Gathering all materials and decontaminating sumps

• Backfilling

• Decontamination, teardown, and demobilization

• T&D

2.1 WORK PLAN DEVELOPMENT

The project work plan describes how the work will be performed according to the SOW asdelineated by the USACE, environmental industrial standards, construction industrial standards,health and safety requirements, and actual conditions encountered at the site.

The work plan also consists of a SSHP and a CSAP. Site Specific Advance Agreements(SSAA) are included in the Cost Proposal which has been submitted under a separate cover.

The USACE supplied SOW served as the basis for the preparation of this work plan and

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2.0 SCOPE OF WORK

associated documents.

2.2 MOBILIZATIONIDEMOBILIZATION

This task involves the actual transportation of personnel, equipment, materials, and otherresources to and from the project site. Personnel, equipment, and materials will be mobilized anddemobilized from OHM's offices in Chicago, Illinois; St. Louis, Missouri; and Findlay, Ohio. It isanticipated that most of the heavy equipment necessary for this project will be rented locally.

Specific details of the proposed project schedule are discussed in Section 3.1, ScheduleMonitoring and Control.

2.2.1 Personnel

Personnel needed for this project are as follows:

l--Site supervisor

l--Project accountant

l--Health and safety technician

l--Foreman

l--Equipment operator

I--Chemist

I--Sample technician

3--Recovery technicians

1--T&D coordinator

It is anticipated that an administrative team will mobilize to the site prior to operationalmobilization to begin the administrative site preparation and to establish logistical support. Theproject manager will mobilize from Findlay, Ohio, for the initiation of the project and on an asneeded basis. In-house support·personnel will be utilized as necessary.

2.2.2 Equipment

Equipment will be mobilized from OHM's offices in Chicago, St. Louis, and Findlay, as wellas rented locally. The major equipment items anticipated to complete this project include anoffice/decontamination trailer, 2-ton stake bed truck with a trailer, two backhoes, a dump truck,

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2.0 SCOPE OF WORK

bobcat loader, Photoionization DetectorlLower Explosive Limit (PIDILEL), portabledecontamination pad, mercury "sniffer", two 3-inch trash pumps, air compressor, cutting torches,computer, and fax machine.

2.2.3 Subcontractors

The primary subcontractors for this project will be T&D, equipment transportation, laboratoryanalysis, and asbestos removal. The mobilization and demobilization of the subcontractors will bemanaged by the OHM project manager in close conjunction with the site supervisory personnel.

A small crew will re-mobilize to the site to load out materials during the T&D phase of theproject. Upon completion of the remediation and T&D phases, the project personnel, equipment,and materials will be demobilized to their respective home offices.

2.3 SITE PREPARATION AND TEARDOWN

The USACE will provide site access, and OHM will secure any permits necessary for on-sitework. Prior to the performance of on-site work, OHM will procure subcontracts and coordinate withlocal hospitals, authorities, and utilities, as necessary. Security clearances for site workers will alsobe provided. This process will continue, as needed, throughout the performance of the project.

The site preparation task includes the placement of the office/decontamination trailer,placement of the decontamination pad, establishment of utilities, coordination with local vendors,and site familiarization.

The portable decontamination pad will be placed in a centralized location and will be used todecontaminate sumps, and heavy equipment. The portable decontamination pad will drain into asump lined with a 55-gallon drum. The sump will be equipped with an electric powered submersiblepump to transfer the decontamination water to a portable holding tank. if necessary. The watertreatment system proposed for treating water in the sumps, west recirculation tank, anddecontamination rinsates will be utilized to reduce the metals concentration of generated waters foracceptance of the effluent by the IAAP tertiary treatment plant. The system will be comprised ofa small chromium reduction tank, if necessary, followed by metals precipitation and clarificationwithin the same tank. The supernatant from this tank will then be passed through a bag filter anddisposable carbon canister and held and tested prior to transportation to the IAAP activated carbontreatment plant.

At the completion of the project, but prior to demobilization. the project site will be inspectedand cleaned. Equipment will be properly cleaned and prepared for demobilization.

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2.0 SCOPE OF WORK

2.4 PESTICIDE PIT

The fence around the pesticide pit will have three sides removed; the side of the fence betweenthe pesticide pit and the Winnebago School House will remain to provide structural security to theschoolhouse and protection for the work crews. The site will be cleared of vegetation usingchainsaws and the backhoe. The perimeter of the pesticide pit will be marked and excavation willcommence utilizing the backhoe. The materials excavated from the pit will be transported to a soilsstaging area. The excavation will be guided using field screening techniques. Upon receipt ofverification analysis that the contamination has been removed, the pit will be backfilled.

2.5 SUMP REMOVALS

The explosive and metal contaminated sumps will be cleaned by IAAP personnel prior toremoval. Piping associated with the sumps will be removed prior to the sump removal. The pipingassociated with the sumps is heavily encrusted with explosive materials. The sumps will beexcavated with a backhoe and by manually. Excavated soils will be transported to the temporaryholding cell after being sampled for characterization analysis. Once removed, the sumps will betransported to the decontamination area, triple-rinsed clean, chip-sampled for characterizationanalysis and transported to the temporary holding cell. Upon receipt of analytical confirmation thateach sump area is free of contamination, the excavation cavities will be backfilled.

2.6 WEST RECIRCULATION TANK

The west recirculation tank will be pumped free of liquids, excavated, and removed to thedecontamination area for cleaning. Any groundwater encountered will be treated for metals, tested,and transported to the IAAP wastewater treatment plant. Upon receipt of confirmation that thecontamination has been removed, the excavation will be backfilled.

2.7 PREVIOUSLY REMOVED SUMPS AND ASSOCIATED EXCAVATIONS

There are a number of previously excavated stainless steel sumps scattered around the facility.Samples of the rainwater collected in the sumps and associated excavation cavities will be sampled,removed, and either treated at the IAAP waste water treatment facility or disposed of off-site. Thestainless steel sumps will be gathered and transported to the decontamination area for cleaning. Theexcavation areas associated with these previously excavated sumps will be sampled. When they areverified to be clean, they will be backfilled. If the sumps area is not verified clean, an additional 6inches of soil in the contaminated area will be excavated and re-tested. The excavations associatedwith the previously removed sumps are simply open holes slightly larger than the sumps that wereremoved. They are open excavations, ready to be sampled.

2.8 TEMPORARY STOCKPILE CONSTRUCTION

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2.0 SCOPE OF WORK

Sumps and associated soils will be stockpiled in a temporary holding cell at a location onIAAP. The bottom of the holding cell will be constructed of a native clay liner. This liner will havea minimum I % degree slope to a leachate collection system. There will be a geotextile separator,a geonet leachate collection and a 60 mil geomembrane liner on the bottom, and a 20 milgeomembrane line on the top covered with 6 to 8 inches of native soil.

Excavated materials from the West Recirculation Tank will be stored separately from the sumpmaterials in a holding cell of similar design and construction.

2.9 TRANSPORTATION AND DISPOSAL

This task involves the T&D of all hazardous and nonhazardous materials generated during thecourse of the performance of the requirements of this project. Section 6.0, Transportation andDisposal, addresses specific T&D options and logic.

2.10 DEMOBILIZATION

This task consists of the physical movement of personnel, equipment, and materials from theproject site back to their respective response centers.

2.11 FINAL REPORT

A final report will be issued within 3 weeks of the completion of the project. The final reportwill contain a summary of the work performed, a narrative of the scope of work performed, andappendices containing all supporting project information and documentation.

77

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3.0 TECHN1CALAPPROACH

OHM's T&D department will submit all relevant supporting documentation such as analyticalreports and material safety data sheets (MSDSs) with the aforementioned documents. These will beaccompanied by a cover letter describing the logic by which OHM arrived at its recommendeddisposal strategy. OHM will not ship any wastes without the prior approval of waste manifests bythe USACE and the IAAP.

The preparation of the final report is discussed in Section 2.10 of this work plan.

3.2 PRECONSTRUCTION ACTIVITIES

Pre-construction activities for this project include the following items:

• Issuing any necessary subcontracts

• Obtaining any necessary permits, i.e. digging if required by the IAAP

• Sourcing OHM internal resources necessary for this project

• Obtaining security clearances for site workers

• Identifying T&D alternatives

OHM understands that the USACE will arrange for any necessary rights of entry.

3.3 CONSTRUCTION ACTIVITIES

The general construction activities that will be performed for this project are as follows:

• Site preparation and setup


• Sump removals

• West recirculation tank removal

• Stockpile soil, sumps and west recirculation tank materials

• Backfill

• Decontamination and teardown

• T&D

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Project 16544Revision 3April 11,1995 <


3.3.1 Site Preparation and Set-up

Site preparation includes the placement of the support trailers and the establishment of supportzones, decontamination stations, and exclusion zones. Other activities will be the establishment ofutilities and familiarization with the site.

It is anticipated that the exclusion zone will be the various excavations. These areas will varyin size depending upon the size of the individual excavation. In the area of the pesticide pit, thedecontamination station will be placed immediately adjacent to the exclusion zone. Thedecontamination station will consist of a portable decontamination pad which will be used todecontaminate any heavy equipment leaving the exclusion zone. The decontamination pad isconstructed of steel and has a raised lip to prevent any rinse waters from leaving the pad. The padis rectangular in shape and sloped toward the middle to provide for the collection of thedecontamination rinse water. The decontamination pad will drain rinsate waters into a sump linedwith a 55-gallon drum which will be equipped with an electrical submersible pump. Thedecontamination rinsates will be pumped into a temporary holding tank if necessary.

3.3.2 Pesticide Pit Excavation

The fence around the pesticide pit will be removed on three sides for ease of access. The fenceclosest to the Winnebago School House will remain standing to protect the school and the workersin the pesticide pit area. The pesticide pit area will then be cleared and grubbed using the backhoeand chainsaws. The perimeter of the pesticide pit will be marked, and excavation will commenceusing a backhoe. Soil will be placed in lined, covered roll-offs pending T&D. Field screeningtechniques (immunoassay) will be used to determine the extent of contamination. Upon receipt ofanalytical confirmation that the excavation is free of contamination, the excavation will be backfilledand compacted in loose lift thicknesses of no more than 12 inches and compacted to at least 85percent of maximum density. After 6 inches of topsoil are placed the area will be reseeded. At alltimes when the excavation is open and no work is proceeding in the area, the excavation will bebarricaded and marked with caution taped to prevent unrestricted access. The excavation will bekept free of excessive water at all times. The excavation will be approximately 10 feet deep, andsamples will be taken from the bucket of the backhoe. It is not anticipated that personnel will needto enter the excavation. The action levels established for the pesticide pit are presented in Table 3.1.

TABLE 3.1EPA REGION III RISK BASE CONCENTRATIONS

Pesticide Commercial (m2lk~)

DDD 12.0

DDT 8.4

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Project 16544Revision 3Apri1Jl,1995 <


DDE 8.4

Endrin 310.0

Chlordane 2.2

Heptachlor 0.64

3.3.3 Sump Removals

There are 36 concrete sumps of concern, five of which are located under ramps and encasedin concrete. There are also seven stainless steel sumps and nine previously excavated stainless steelsumps. The sumps range in size from 2 feet by 2 feet to 14 feet by 20 feet. Some of the sumps areaccessible by machine, others will have to be removed primarily by hand. The excavations willrange in depth from approximately 1- to 6-feet deep. Samples will primarily be gathered with thebackhoe. If it is necessary for personnel to enter any excavations, the excavation will be sloped to1.5: 1 degree.

Some of the sumps contain explosives contamination, and it is assumed that some of the sumpshave only metals contamination. Sumps 13 and 32 will be handled separately due to the presenceof mercury. Any other sumps where mercury is found will be handled separately along with Sumps13 and 32. IAAP personnel are unaware of the source of the mercury.

Sumps will be cleaned by IAAP personnel prior to removal. All liquids in any of the sumpswill be removed prior to commencing any excavations. The water treatment system proposed fortreating water in the west recirculation tank and decontamination rinsates will be utilized to reducethe metals concentration of generated waters for acceptance of the effluent by the IAAP tertiarytreatment plant. The system will be comprised of a small chromium reduction tank, if necessary,followed by metals precipitation and clarification within the same tank. The supernatant from thistank will then be passed through a bag filter and disposable carbon canister and held and tested priorto transportation to the IAAP activated carbon treatment plant. Prior to removing sumps, theexisting piping will be removed. It is known that some of the piping is heavily encrusted withexplosive materials. Piping will be removed slowly, methodically and carefully using a wheel cutter( pipe cutter). Cutting fluid will be used copiously and pipe temperature in the immediate area ofthe cut will be monitored continuously. There will be two crews working concurrently on the sumpremovals. The first two-person crew will remove the sumps that are accessible with a backhoe.These sumps will be transported to the decontamination area, triple-rinsed clean, chip-sampled forcharacterization analysis, and transported to the temporary stockpile location. Sump excavations willinitially be guided using field screening techniques using immunoassay test kits for explosives. Allsoils temporarily stored will be segregated by wastestream. The sumps will be transported to thedecontamination area. After a sump has been excavated, confinnatory samples will be taken of theexcavation and sent for laboratory analysis on a 5- or 7-day turnaround basis. The open excavationswill be barricaded and marked with caution tape to prevent unrestricted access. Excavations will bebenned to prevent water from flowing into the excavation. Once an excavation has been confirmedclean, the excavation will be backfilled and compacted according to specifications and the area

]0

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Project 16544Revision 3April II, 1995 <


reseeded.

Sumps with limited access will be removed by a two-person crew utilizing jackhammers and/ora Bobcat type loader. The soils and sumps removed will be temporarily staged on visqueen near theexcavations and will be transported to the temporary stockpile location and the decontaminationarea, respectively. Transportation will occur in a relatively short time frame and will be dictated bythe availability of equipment at the project site. Materials excavated from the sumps will beseparated into two separate waste streams. Waste streams will be based on whether or not mercuryis present in the material. Material with mercury contamination will be disposed of off site.Materials with no mercury contamination will be stockpiled near the IAAP landfill. The bottomliner will consist of a 60 mil geomembrane with a clay layer. The bottom liner will have a minimumslope of 1% and will slope to a leachate collection sump. The bottom liner will also have ageotextile separator and a geonet leachate collection layer. The pile will be covered with 20 milgeomembrane and a 6 to 8 inch soil covering. The top cover will have a maximum slope of 5H: 1Vand a minimum slope of 5%. Figure 3.2 illustrates the stockpile construction. It should be notedthat some of the sumps removed with jack hammers will be at least partially destroyed duringremoval and become part of the debris wastestream.

There are five sumps encased in concrete underneath ramps. At this time, the plan for thesefour sumps is to access them with jackhammers, clean the sumps, and abandon them in place byfilling them with a non-shrink grouting material. Any contaminated soil encountered will beexcavated to the extent possible without affecting the structural integrity of the ramp foundations.This approach has been chosen because it will result in the least amount of compromise to thestructural integrity of the concrete ramps.

As personnel and equipment become available from the sump removal task, the previouslyexcavated sumps will be transported to the decontamination area for cleaning prior to release to theIAAP. The previously removed sumps are stainless steel and were removed by IAAP personnel.

The asbestos piping will be removed by a licensed-Iowa subcontractor in accordance with allfederal, state, and local regulatory requirements. This task will begin concurrently with the pesticidepit removal to ensure that sumps are available to be removed when personnel and equipment becomeavailable. The specific asbestos work plan is attached to the asbestos subcontractor's quotation.

During the pesticide pit removal, a sampling crew will take samples from the previouslyremoved sumps to detenmne whether to backfill or further excavate these areas. This sampling crewwill also work concurrently with the sump excavation crews, field screening the excavations andgathering confirmatory samples. This methodology will ensure that the excavations can bebackfilled and compacted in the shortest amount of time.

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Project 16544Revision 3April ll, 1995

6' - 8* COVER SOIL

MAXIMUM SLOPE, 5H:1 VMINIMUM SLOPE, 5%

LEACHATECOLLECTION

SUMP


GEONET LEACHATE COLLECTION LAYER

GEOTEXTILE SEPARATOR

20 MIL GEOMEMBRANE

CLAY LINERMINIMUM SLOPE 1"....

TYPICAL CROSS SECTION

REMOVABLE COVER


55 GALLONPOLY TANK

[STOCKPILE 20 MIL GEOMEMBRANE LINER


60 MIL GEOMEMBRANE LINER<8

OHM CorporationFindlay, Ohio

LEACHATE COLLECTION SUMP DETAIL

[7raMl B4: Creeked ~4:

L.CitiWNN[7ate: AwrlM!d~:

4/4/9(j

S:ale: [7riMh:.l No:Nf5 16(j44A1


Table 3.2 shows the estimated quantities of contaminated soil to be removed for the varioussumps and the west recirculation tank. These are only estimates, and the actual quantities will bedetermined by field screening and analytical results. It should be noted that the excavations fromthe previously excavated sumps are assumed to not be contaminated; however, the excavations willbe screened to determine if additional excavation is necessary. Confirmation sampling will beperformed prior to backfilling excavations.




TABLE 3.2ESTIMATED SOIL VOLUMES FROM SUMP EXCAVATIONS

Sump Excavation Quantity ofSoil CommentsNo. Perimeter (in cubic yards)

1 6-inch 5 The contamination primarily exists at thesurface of this sump.

2 6-inch 3 Contamination primarily exists at thenortheast comer of the sump. Minimalsurface contamination.

3 2-foot 16 Contamination exists at the northwest cornerand at the southeast corner form the surfacedown to an estimated depth of two feet.

4 6-inch 6 Contamination exists at the surface at thenorthwest corner and at the southeast corner.The topography slopes from the northwest tothe southeast.

8 I-foot 18 Contamination exists around the entire sumpdown to a depth of 3.5 feet.


10 2-foot 14 Contamination exists at the entire surface ofthe sump and down to a depth of 3 feet.


13 2-foot 19 Contamination exists at the surface of theentire sump down to a depth of 3 feet (Highlevels of mercury).



16 6-inch 2 Contamination exists at the north and southsides of the sump down to a depth of 3 feet.

17 6-inch 2 Contamination exists at the northeast andsouthwest corners of the sumD down to 3 feet.

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19 6-inch 4 Contamination exists on the east and westsides of the sump down to 3 feet.

22 6-inch 1 Contamination exists at the surface at thesouthwest comer.

23 6-inch 1 Contamination exists at the outfall pipe and aditch west of the sump down to 1.5 feet.



26 6-inch 1 Contamination exists on the west side of thesump down to a depth of 2 feet.

27 6-inch 1 Contamination exists at the surface on thenorth and south sides of the sump.

28 2-foot 4 Contamination exists at the north and southsides of the sump down to depth of 2 feet.

29 6-inch 1 Contamination exists on the west and eastside of the sump down to a depth of 2.5 feet.

30 I-foot 1 Contamination exists at the surface on thewest and east side and down to 2 feet on thewest side.

31 6-inch 1 Contamination exists down to 2 feet on thewest side of the sump and at the surface in alow area southeast of the sump.

32 2-foot 5 Contamination exists down to 2.5 feet at thenorthwest comer of the sump.

34 6-inch 1 Contamination exists at the northwest comerof the sump down to 2 feet. Surfacecontamination exists on the east side of thesump.

35 6-inch 1 Contamination exists down to 3 feet on thenorth side of the sump. Surfacecontamination exists on the south side.

36 6-inch 1 Contamination exists down to 2.5 feet on boththe east and west sides of the sumo.


Project 16544Revision 3AprillJ,1995


37 6-inch 3

38 6-inch 1

39 6-inch 1

40 6-inch 1

41 6-inch 3

42 6-inch 3

43 6-inch 4

44 6-inch 4

West 3-foot 96Recric.Tank

Total 273

*Note: Sump Numbers 37-44 do not have associated analytical data.

3.3.4 West Recirculation Tank

The west recirculation tank is approximately 22 feet long and 10 feet in diameter. The tankcontains baffling and piping and is approximately half buried (horizontally) in the ground.Groundwater has intruded into the tank and at the time of the site visit had filled approximately halfof the buried portion of the tank. The excavation will be approximately 3 feet deep, and samples willbe taken from the backhoe bucket.

The tank atmosphere will be measured and continuously monitored with an LELl02 meterduring operations. The groundwater will be transported to the water treatment system to reduce themetals concentration prior to transportation to the IAAP wastewater treatment plant. In the eventthat the IAAP wastewater treatment plant is unable to handle the volume of water generated,provisions will be made to temporarily store the water. If water storage is necessary, a 12,OOO-gallonportable pool will be used.

As the tank is being dewatered, it will be cut into pieces using plasma arc cutting torches. Thepieces of the tank, baffling, and associated piping will be temporarily staged on visqueen andsubsequently hauled to the decontamination area.

Once the tank and its components have been removed, any contaminated soil will be excavated.Because of the hydraulic flushing of the tank by groundwater, it has been assumed that a 3-footperimeter around the tank will need to be excavated due to contamination. This soil will be stagedand sampled to determine if contamination is present. This soil will be stored adjacent to, and in the


Project 16544Revision 3AprillJ. 1995


same manner as, the sump material. Samples will be taken of the excavation area after fieldscreening has been performed and the excavation area backfilled upon receipt of confirmation thatthe contamination has been removed. The action levels for the west recirculation tank are the sameas the sumps listed in Table 3.3. As with all open excavations, when work is not being performedin the area, the excavation area will be barricaded and encircled with caution tape. It should be notedthat USACE compaction specifications may not be achieved due to the intrusion of groundwater.

TABLE 3.3ACTION LEVELS

Contaminants SoD (mg/kg) Water (mg/L)

HMX 51,000** 5.1 *

RDX 53* 0.002*

2,4,6-TNT 196* 0.0095*

1, 3, 5-TNB 102* 0.005*

2,6-DNT 8.7 0.00042*

2,4-DNT 8.7* 0.00042*

Nitrobenzene 510** 0.05*

Cadmium 510** 0.05*

Copper 38,000** 1,400**

Lead 500 0.005

Chromium 5,100** 0.005*

Silver 5,100** 0.5*

Antimony 816* 0.04*

Mercury 310** 0.031 *

Barium 72,000** 7.1 *

Nickel 20,000** 2*

Tetrvl 10,000** 1*

Arsenic 3.4* 0.00016*

* PRGSs calculated at IAAP.** From Risk-Based Concentration Table, Region III.

77



:-~ OHM Remediation'" Services Corp.~...=::::- A Subsidiary of OHM Corporation

April 11, 1995

Mr. I,m O'NeillDepartment of the AnnyUnited States Anny Corps of EngineersFort Crook Area OfficeATIN: CEMRO-CD-FC-R\O'NeillBuilding 527, Room 324Fairchild HallOffutt AFB, NE 68113


ACTIONS AT THE PESTICIDE PIT AND EXPLOSIVE CONTAMINATED SUMPSlOWA ARMY AMMUNITIONS PLANTCONTRACT NO. DACW45-94-D-QQQ5

DELIVERY ORDER NO.3

Dear Mr. O'Neill:

OHM Remediation Services Corp. (OHM), a wholly owned subsidiary of OHM Corporation, ispleased to submit the above-referenced work plan changes. We have enclosed only those pagesthat have changed. These pages have been marked Revision 3. Copies have been enclosed foryour review. Additional copies have been submitted as specified in the submittal register andtwo copies have been sent to Ms. Sharon Lehn.

If you have any questions, please do not hesitate to give me a call at 419-424-4940.

Si~~~.Resnik

Deputy Program ManagerGovernment Services

pc: Schmidt (2)Shields (5)Romitti (1)Project 16544

16406 U.S. Route 224 East • P.O. Box 551 •

Vedder (1)Baxter (5)Lahn (2)Marquess (4)

('>' ~"".{.\ -.;..../..: /; .. If:1J

,. ~J I'f..ji~i.i "11 ~.

Findlay, OH 45839-0551 • 419-423-3526

Documents

Final Work Plan Response Interim Removal Actions at the … · 2016. 10. 12. · I--Projectaccountant I--Healthand safety technician I--Foreman l--Equipmentoperator l--Chemist I--Sampletechnician