w Wtr Chapter 9

Colorado Springs Utilities Line Extension & Service Standards-2004 Wastewater© 2004 City of Colorado Springs on behalf of Colorado Springs Utilities 9-1

TABLE OF CONTENTS

CHAPTER 9

Wastewater Grease and Sand/Oil Trap/Interceptor Standards

These standards should be read in conjunction with the (FOG) Fats, Oil and Grease Policies andProcedures Manual available on Colorado Springs Utilities Internet site under BusinessSolutions.

ParagraphNumber

Title PageNumber

9.01 General ...........................................................................................................9-39.02 Definition (Fats, Oil and Grease Policies and Procedures Manual) ..............9-39.03 Approval. .......................................................................................................9-59.04 Design ............................................................................................................9-5

(a) Sample Trap..............................................................................................9-69.05 Location .........................................................................................................9-79.06 Maintenance...................................................................................................9-79.07 Sizing Criteria. – Includes Calculation Sheet for Recommended Grease

Interceptor Sizing............................................................................................... 9-7Example – Recommended Grease Interceptor Sizing Formula …..………. 9-9

9.08 Variances (Given with the approval of the Colorado Springs Utilities)........ 9-10(a) Hot water only pre-rise wash procedures …..…………………………. 9-10

9.09 Sand/Oil Interceptor........................................................................................... 9-129.10 Lint Interceptor for Laundromats (includes sizing criteria) …………………9-189.11 Swimming Pool (Indoors and outdoors) ........................................................... 9-199.12 Abandoned Interceptors and traps .................................................................... 9-199.13 Typical Abbreviations ....................................................................................... 9-19


Blank Page


CHAPTER 9

WASTEWATER GREASE and SAND/OIL TRAP/INTERCEPTOR STANDARDS

9.01 General. When required, traps/interceptors shall be provided when in the judgment of ColoradoSprings Utilities, Chief Executive Officer or their designee, they are necessary for the properhandling of liquid wastes containing grease or solids which may be harmful to, or causeobstruction of the publicly owned treatment works, or interfere with the operation of thetreatment works.

All drains from the kitchen, food preparation, and dishwashing areas shall be connected to thegrease trap/interceptor. Fixtures to be connected include, but are not limited to, scullery sinks,pot and pan sinks, dishwashing machines (with a heating temperature of less than 140 degrees),soup kettles, and floor drains located in areas where grease containing materials may exist.When deemed necessary by Colorado Springs Utilities, garbage disposals (Garbage Grinders)will be required to be connected to an approved trap/interceptor. A grease interceptor is aexternal unit, different than a grease trap, which is a small indoor device, given with the approvalof Colorado Springs Utilities.

No grey water, with the exception of hand sink in the kitchen area, toilets, urinals, and similarfixtures shall enter through the trap/interceptor. All designated kitchen waste shall enter the trap/interceptor through the inlet pipe only.

Installation of a trap/interceptor may not be required for facilities that do not cook the food thatis served, and/or do not wash equipment or utensils associated with preparation or service ofcooked or baked foods.

9.02 Definitions. (From the (FOG) Fats, Oil and Grease Policies and Procedures Manual)a.) Best Management Practices (BMPs): Schedules of activities, prohibitions of practices,

maintenance procedures, and other management practices to prevent or reduce the pollutionof waters of the State. Best Management Practices include procedures and practices thatreduce the discharge of Fats, Oil and Grease (FOG) to the building drain and to theWastewater System.

b.) Collection Line: That portion of the Wastewater Treatment System, which collects andtransmits Wastewater from Users to the Wastewater treatment plant, excluding ServiceLines.

c.) Colorado Dischare Permit System (CDPS) permit: Means: Colorado Discharge PermitSystem Permit No. CO-0026735 issued by the State to the City of Colorado Springs.

d.) Domestic Wastes or Wastewater’s: (i) Wastewater from normal residential activitiesincluding, but not limited to, Wastewater from kitchen, bath, and laundry facilities; (ii)Wastewater from the personal sanitary conveniences (toilets, showers, bathtubs, fountains,non-commercial sinks and similar structures) of commercial, industrial or institutionalbuildings, provided that the Wastewater exhibits characteristics that are similar to those ofWastewater from normal residential activities; and (iii) specifically excluded is Wastewaterfrom commercial, industrial, or institutional laundries or food preparation facilities.


e.) Existing Food Service Establishment: Any Food Service Establishment, which is not aNew Food Service Establishment.

f.) Fat, Oil and Grease (FOG): A semi-solid, viscous liquid organic polar compound derivedfrom animal and/or plant sources that contain multiple carbon chain triglyceride molecules.These substances are detectable and measurable using analytical test procedures establishedin 40 Code of Federal Regulations (CFR) Part 136, as may be amended.

g.) Food Service Establishment: A commercial facility engaged in preparing and/or servingfood for consumption by the public, such as restaurant, commercial kitchen, caterer, hotel,school, hospital, prison, correctional facility, and care institution.

h.) Grease Interceptor: A tank that serves one or more fixtures and is remotely located. SuchGrease Interceptors include, but are not limited to tanks that capture Wastewater fromdishwashers, floor drains, pot and pan sinks and trenches. A Grease Interceptor is an outside,underground, multi-compartment tank that reduces the amount of FOG in Wastewater priorto discharging into the Wastewater Treatment System. (Reference Section 9.07)

i.) Grease Trap: A device designed to retain grease from one to a maximum of four fixtures.A Grease Trap is not appropriate for use on heated water (e.g. dishwasher) or in-line to awaste disposal unit (e.g., garbage disposal and grinders). A Grease Trap is a small, indoordevice. (Reference Section 9.08) Colorado Springs Utilities requires that the capacity of thetrap be no less than one hundred (100) pounds grease retention with a flow rate of fifty (50)gallons per minute.(Reference Wastewater Construction drawings C 2-1,2,3)

j.) Industrial User: A source of discharge, which introduces pollutants into the Publicly-OwnedTreatment Works from any non-domestic source.

k.) Interference: A discharge which, alone or in conjunction with a discharge or dischargesfrom other sources:

i) Inhibits or disrupts the Publicly-Owned Treatment Works, its treatment processesor operations, or its sludge processes, use or disposal; and

ii) Therefore is a cause of a violation of any requirement of the Publicly-OwnedTreatment Works’ CDPS permit.

l.) Liquid Waste Hauler: Any person, firm, corporation or other entity that collects, pumps,transports and/or disposes of liquid wastes.

m.) New Food Service Establishment: Any Food Service Establishment for which (1) a contractfor construction or significant reconstruction has not been entered into prior to the EffectiveDate of this manual; or (2) for which tenant finish in a pre-existing building has notcommenced prior to the Effective Date of this manual. Generally, significant reconstructionwill be presumed to have taken place where the capital cost of the new construction exceeds$100,000.

n.) Non-Significant Industrial User Control Mechanism: A written authorization to dischargeissued to other than Significant Industrial User as a pollution prevention measure to minimizepollutant loading by Industrial Users.


o.) Publicly Owned Treatment Works (POTW): Any devices, facilities, structures, equipmentor works owned by the City or used by Utilities for the purpose of the transmission, storage,treatment, recycling and reclamation of Industrial and Domestic Wastes, or necessary torecycle or reuse water at the most economical cost over the estimated life of the system,including intercepting sewers, outfall sewers, Collection Lines, pumping, power and otherequipment, and their appurtenances and excluding Service Lines.

p.) User: Any person, firm, corporation, government or other entity that discharges, causes orpermits the discharge of Wastewater into the POTW.

q.) Wastewater: The liquid and water-carried Industrial or Domestic Wastes and pollutantsfrom dwellings, commercial buildings, industrial facilities and institutions, including hauledliquid waste and any groundwater, surface water and stormwater that may be present,whether treated or untreated.

r.) Wastewater Treatment System: See definition of Publicly Owned Treatment Works.

s.) Wastewater System: See definition of Publicly Owned Treatment Works.

9.03 Approval. The size, type and location of each trap/interceptor shall be approved and inspectedby Colorado Springs Utilities, in accordance with these standards. Except where otherwisespecifically permitted, no wastes other than those requiring separation shall be discharged intoany trap. One set of plans, including complete mechanical and plumbing sections shall besubmitted to Colorado Springs Utilities for approval prior to construction. Such plans shallinclude the calculation of the size, type, location of the trap and out-fall location to the main linefor each trap/ interceptor. (Per City Code §§ 12.5.803 Pretreatment Facilities; Submission ofPlans).

9.04 Design. All traps/ interceptors for grease and heavy solids shall be so designed and located as tobe readily accessible for cleaning and shall have a water seal of not less than six (6) inches.Interceptor shall be constructed in accordance with the design specifications contained herein,shall be approved by the Colorado Springs Utilities, and shall have a minimum of two (2)compartments with fittings designed for grease retention. There shall be a minimum of twomanholes to provide access for cleaning and inspection of all fixtures and compartments of theinterceptor. A minimum of one (1) access per ten (10’) feet of interceptor length, additionalaccess shall be required for each additional ten (10’) feet in length. The trap/interceptor shall belocated at least twenty-five (25’) feet from the last appliance connected to the grease line withinthe building. In the case of smaller or circular interceptor (with the approval of Colorado SpringsUtilities), where it is not practical to install two access manholes, a single manhole shall belocated so as to permit entrance to the first compartment, and inspection of the second. All areasof the second compartment shall be accessible for cleaning. Manhole covers shall be gas-tight inconstruction, having a minimum opening dimension of twenty-four (24”) inches. In traffic areas, the interceptor shall be designed to have adequate reinforcement and cover(including piping), meeting HS-20 traffic loading specifications. Grease Interceptor in trafficareas require a concrete driving surface over piping with structural backfill around piping. Interceptor shall be designed so that they shall not become air bound if a closed cover is used.The tank and the discharge line shall each be vented, and the vents shall not be tied together lessthan forty-two (42”) inches above the tank lid elevation. Reference: Standard Detail Drawing – C2-4 Typical Restaurant Grease Interceptor. Drawing details of outlet/drainage design (including


size) to be shown on the approved construction or service plans. (Per City Code §§ 12.5.803Pretreatment Facilities; Submission of Plans, City Code §§ 12.5.407 Service Lines; Separate foreach building; Exceptions)

Additional Notes for Commercial Services

Points to Consider when designing Sand/Oil and Grease Interceptor

Grease /Sand-Oil Interceptor

- Grease or Sand/Oil trap/interceptor are required for restaurants, grocery stores, cafeterias,coffee shops and any business that stores, repairs or services automobiles.

- Traps/Interceptors will be sized and approved by Colorado Springs Utilities (Based on EPA–2 Model)

- Interceptor must be drawn to scale and be shown on the Utility Services Plan.- Only grease or oily wastes will be routed through these traps/ interceptors.- Under sink grease interceptors will not be accepted in lieu of exterior grease interceptor.- For “shell only” construction, provisions must be made for the installation of

traps/interceptors to serve any future tenant finish projects where food products may be used.Developers of shopping centers/strip buildings are encouraged by Colorado Springs Utilitiesto install two dedicated sanitary sewer lines. Stub outs to direct the kitchen waste of futurefood service facilities into an outside grease interceptor, then return the effluent from thegrease interceptor back into the building sanitary sewer, as illustrated below.

Schematic of a proposed Internal Building sanitary sewer design to one Grease Interceptor.

(a) Sample Trap.

A “sample trap” shall be provided on the outlet side of each grease interceptor, before thedown stream clean out and vent (Reference: Standard Detail Drawing – C 2-4 Typical RestaurantGrease Interceptor). The “sample trap” shall be a tee connection, located within two (2’) feet ofthe wall, on the outlet (downstream) pipe side. The tee shall be extended to the surface (forinspection purpose) with a pipe and a clean out adapter used to cap the pipe. In areas where trafficmay exist, a valve box configuration shall be used to protect the inspection pipe.


9.05 Location. All traps shall be readily accessible for inspection, servicing, and maintaining and bein proper working condition (Planting restrictions are for trees only unless specifically noted, nolandscaping shall be permitted within fifteen (15’) foot radius clear from the center of manholeaccess location, also provide a sixteen (16’) foot wide access route to manholes in landscapeareas. (Reference: Colorado Springs Utilities Site Design Guidelines-Facilities Requirements)).The use of ladders or the removal of bulky equipment in order to inspect or service interceptorsshall constitute a violation of accessibility. Where feasible, all interceptors shall be locatedoutside of the facility served. Interceptor may not be installed in any part of a building where foodis handled. Location of all interceptors shall be approved by Colorado Springs Utilities, and shallbe shown on the approved service utility plan connected to the outfall line.

9.06 Maintenance. The owners and/or lessees shall be jointly and severally responsible for cleaning andmaintaining the grease traps/ Interceptor in efficient operating condition. Traps/ Interceptor shall bemaintained by regularly scheduled removal of the accumulated grease and solids, approximately on athree (3) to six (6) month interval. This maintenance shall be performed before the retention capacityof the trap/ interceptor is exceeded. A record of the maintenance shall be maintained for at leastthree (3) years at the site location at all times. The Industrial Waste section shall perform routineunannounced inspections on a periodic basis. (Per City Code §§12.5.804: Pretreatment Facilities;Operations)

9.07 Sizing Criteria. When determining the minimum size of an interceptor required, (examplefollowing on the next page) the following will be considered:

1.) The minimum acceptable volume of a grease interceptor shall be not less than seven hundredfifty (750) gallons. (With Dishwasher - 1000 gallons.) The maximum individual size shall bethree thousand (3000) gallons, a series of interceptor’s maybe necessary for larger greaseinterceptor capacities greater than three thousand (3000) gallons.

GREASE TRAP/INTERCEPTOR AND SAND/OIL INTERCEPTOR APPROVAL BOX(To be added to the Utility Service Plan for signature)

COLORADO SPRINGS UTILITIESWASTEWATER GREASE TRAP/INTERCEPTOR AND SAND/OIL

INTERCEPTOR APPROVAL

Date:________________By:_________________

CALCULATIONS REVIEWED _________ SITE LOCATION REVIEWED __________

SIZE _____________ GAL. (INTERNAL/EXTERNAL)

In case of errors or omissions with the sewer design as shown on this documentthe standards as defined in the “Line Extension and Service Standards” shall rule.

Approval expires 180 days from Design Approval.


2.) Example Reference: Recommended Grease Interceptor Sizing Formula – Based on EPA-2 Model, for determining the size of grease interceptor to be installed, subject to approval of theColorado Springs Utilities. (Example of calculation shown below)

TYPE OF FIXTURE RATE OF FLOW (GPM)

Floor drain/sink 10Restaurant kitchen sink, Wok oven 15Single compartment scullery sink 20Double compartment sinks 35(2) Single compartment sinks 25(2) Double compartment sinks 35Triple sink unit with a 1 ½” drain 35Triple sink unit with a 2” drain 35

Restaurant dishwasher:Up to 30 gallon water capacity 1530 to 50 gallon water capacity 2550 to 100 gallon water capacity 40


EXAMPLE

RECOMMENDED GREASE INTERCEPTOR SIZING FORMULA

Based on EPA-2 Model

A. Determine maximum drainage flow from fixtures:

Type of fixture Flow Rate AmountFloor drain/sink 10 gpmRestaurant kitchen sink, Wokoven

15 gpm

Single compartment sink 20 gpmDouble compartment sink 25 gpm2, single compartment sinks 25 gpm2, double compartment sinks 35 gpmTriple sink 1 ½ in. drain 35 gpmTriple sink 2 in. drain 35 gpmUp to 30 gal. Dishwasher 15 gpm30 gal. To 50 gal. Dishwasher 25 gpm

50-100 gal. Dishwasher 40 gpm

Example

1 x 15 = 15

1 x 35 = 35

1 x 25 = 25

B. TOTAL – Divided by no. offixtures

/ = gpm(PER KITCHEN)

75/3 = 25

C. Loading FactorsRestaurant type Fast food-paper delivery = .50

Low volume = .50Medium volume = .75High volume = 1.0

D. B x C = sub total (D) _______

E. Total (D) x 60 min. = max. flow for 1 hour _______

F. (E) x 2 hours retention time = volume of Interceptor in gallons _______

(Lowvolume)

0.5 x 25

= 12.5

12.5 x 60= 750

750 x 2= 1500 gpm


9.08 Variances (Given with the approval of the Colorado Springs Utilities). Variances to theabove standards and criteria shall be valid only when the discharge from the user is in continuouscompliance with Article Five – Wastewater Treatment Code of Chapter Twelve Utilities of theCity of Colorado Springs Code of Utilities.In the event that a variance to the minimum size requirement is granted, in no case shall thecapacity of the traps be less than one hundred (100) pounds grease retention [Flow rate 50 gpm],and shall be an in-ground/floor application. The minimum inspection/cleaning frequency of anyindoor trap shall be monthly, and a written record of all inspections shall be maintained on site.(Reference Wastewater Construction detail drawing C 2-1,2,3 – Internal Grease Trap RestaurantSchematic, On-floor internal grease traps are not recommended by Colorado Springs Utilities forinstallation in restaurants).Additional Notes for Commercial Services

• Grease Interceptor are required for restaurants, grocery stores, cafeterias, coffee shops.• Interceptor will be sized and approved by Colorado Springs Utilities (Based on EPA – 2 Model )• Interceptor must be drawn to scale and be shown on the Utility Services Plan.• Only grease or oily wastes will be routed through these interceptors.• For “shell only” construction, provisions must be made for the installation of an interceptor to

serve any future tenant finish projects where food products may be used.• “Grease Pigs” are not recommended by Colorado Springs Utilities due to Health, Safety and

Environmental problems in the maintenance of these storage units.

(a) Hot water only pre-rise wash procedures

For information contact Colorado Springs Utilities Industrial Pretreatment Section, thisprocedure is only approved in an area where no grease trap/interceptor can be installed.

In an effort to control the discharge of fats, oils and greases (FOG) in food service facilitieswhere appropriately sized grease interceptors cannot be installed, the Colorado Springs Utilitiescan authorize the use of a Hot Water Only Pre-rinse Wash Procedure. The Hot Water OnlyPre-rinse Procedure promotes more effective FOG removal by isolation and removal ofdetergents in the pre-rinse process. The use the Hot Water Only Pre-rinse Wash Procedure in-lieu-of ordinance stated requirement. This procedure is applicable to the site only and is nottransferable to any other location, facility or ownership. Failure to meet conditionalrequirements may result in enforcement actions taken against said facility.


Schematic of a four compartment sink set-up

Minimum 25 gpm grease trap: larger grease trap maybe required with approval of Colorado SpringsUtilities. This application only for an On-floor grease trap as illustrated.

Washing procedures using four compartment sink

1. Thoroughly scrape all dishes and other ware into solid waste container prior to pre-rinse.

2. Thoroughly pre-rinse all dishes and cookware in designated pre-rinse compartment (usually 1st

sink compartment) using hot water only. No detergent used in this step.

3. After pre-rinse, place dishes and cookware in the dishwasher or wash (2nd compartment), (3rd

compartment), and sanitize (4th compartment) in accordance to state restaurant sanitation rules inthe remaining three sink compartments.

Note 1:Hot water heater requirements may need to be altered to adhere to sanitation requirements.

Note 2:This procedure is only valid if pre-rinse sink is discreetly plumbed to a dedicated manual orautomatic grease trap. A dishwashing machine must not be plumbed to grease trap for internaluse.

For information contact Colorado Springs Utilities Industrial Pretreatment Program at 719-668-4506 orColorado Springs Utilities Internet Site at www.csu.org –Business – Service – Industrial Pretreatment –Fat, Oil and Grease.

WASH RINSE SANITIZEPRERINSE

(HOT WATER SINK ONLY,NO DETERGENT)

INDIRECT

Automatic or manual greasetrap with solids strainer

TO SANITARYSEWER ORGREASEINTERCEPTOR


9.09 Sand/Oil Interceptor. Metals such as copper, lead, molybdenum, and zinc, and oil and greaseare among the pollutants commonly found in vehicle service wastewater. Interceptor, asdescribed in these standards, shall be installed in, but not limited to, the following locations: carwashes, motor vehicle, boat or airplane storage yards, gasoline and diesel service stations, repairgarages, or any other similar facility which may introduce sand and oil into the sewer system.(Reference Colorado Springs, Colorado City Code, Section 12-5-701)

Location:a. Sand/Oil Interceptor shall be so installed and connected that they shall be at all times

accessible for inspection, cleaning and removal of the intercepted waste.b. Sand/Oil Interceptor shall be placed as close as practical to the fixture served.c. Sand/Oil Interceptor shall be located on the outside of buildings unless otherwise specifically

approved in writing by the Colorado Springs Utilities.d. Sand/Oil Interceptor shall be located as to be accessible for service without the use of ladders

or the removal of bulky equipment.e. Location of all Sand/Oil Interceptor and its outfall location shall be shown on the approved

construction or utility service plans.f. Each sand/oil interceptor shall serve only one business establishment. Multiple business

connections to a single sand/oil trap are not permitted unless approved by Colorado SpringsUtilities in writing.

Size:Sand/Oil Interceptor volume shall be a minimum of one thousand (1000) gallons of totalliquid capacity. Clean-outs shall be installed in the drainage piping inlet and outlet side of eachsand/oil interceptor. In areas where traffic may exist, the trap shall be designed to have adequatereinforcement and cover (including piping), meeting HS-20 traffic loading specifications. Ifpiping is metal, corrosion protection shall be shown on the service plan per these specifications.Reference: Wastewater detail drawing – C 2-7 Typical Sand & Oil Interceptor for AutomotiveApplication.

GREASE TRAP/INTERCEPTOR AND SAND/OIL INTERCEPTOR APPROVAL BOX(To be added to the Utility Service Plan for signature)

COLORADO SPRINGS UTILITIESWASTEWATER GREASE TRAP/INTERCEPTOR AND SAND/OIL

INTERCEPTOR APPROVAL

Date:________________By:_________________

CALCULATIONS REVIEWED _________ SITE LOCATION REVIEWED __________

SIZE _____________ GAL. (INTERNAL/EXTERNAL)

In case of errors or omissions with the sewer design as shown on this documentthe standards as defined in the “Line Extension and Service Standards” shall rule.

Approval expires 180 days from Design Approval.


Wash-Only Car Wash FacilityStandard/basic car-wash facilities either single bay or auto bay configuration shall be connectedfrom an internal catch basin/drain to a Sand/Oil Interceptor and then connected to ColoradoSprings Utilities sanitary sewer main line. Sand/Oil Interceptor shall be located on the outside ofbuildings unless otherwise specifically approved in writing by the Colorado Springs Utilities.Location of all Sand/Oil Interceptors and its outfall location shall be shown on the approvedconstruction or utility service plans approved by Colorado Springs Utilities. (Plumbing plansmaybe requested by Colorado Springs Utilities to be attached to the approved construction orutility service plans for inspection and record purposes)

Reclaimed/Recycled Water within a Car Wash FacilityAll on-site recycled water piping shall be manufactured and installed in accordance with theUniform Plumbing Code, Appendix J and all governing codes, rules and regulations set down byRegional Building Department and the City of Colorado Springs. All piping shall becontinuously and permanently marked with the manufacturer’s name or trademark, nominal sizeand schedule or class indicating the pressure rating. There shall be no connection betweenrecycled water systems and the potable water system without the necessary backflow connectiondevice. (Reference City Code Chapter 12.4.12 - Cross Connection Control).

Recycled water systems shall be completely separate from the potable water system, there shall be noconnection between recycled water systems and the potable water system without the necessarybackflow connection device. (Reference City Code Chapter 12.4.12 - Cross Connection Control).External area drains or catch basins exposed to the environment shall be connected to the storm drainagesystem, only internal drains (covered) are permitted to connect to the Colorado Springs Utilities sanitarysewer system.

Reclaim Car Wash facility could include, but not limited to the following items:a. (Internal) Catch Basin/Trough drain, grated: should be constructed at a minimum depth of

three (3’) feet deep (to prevent freezing of the pipes) and shall connect into a preliminarySand/Oil Interceptor. (Outlet pipe to be located a minimum of three (3”) inches above floorof catch basin floor). The minimum slope and cover for all pipes/drains shall be per ColoradoSprings Utilities specifications. The minimum size for a drainpipe shall be four (4”) inchdiameter @ a grade of 2.08% (six (6”) inch @ 1.04%).

b. The preliminary Sand/Oil Interceptor approved by Colorado Springs Utilities (that mayincluding a sand filter for filtration of particles) shall be sized to accommodate the capacityof the entire car washing facility and shall feed into a reclaim tank (s).

c. Reclaim Tank(s) shall recycle the reclaimed water and shall (this may include the followinginternal fitting: Filtration System, pressure switch, fresh water connection for final rinse,pressure washer, control panel, High level alarm, pump off switch). Be connected to aBackwater Valve (Reference: Chapter 7 and Wastewater Construction Drawing C 2-5)downstream of reclaimed tank(s) before a sanitary sewer service line connection.

NOTE: A Backwater Valve shall be install to prevent any contamination of the reclaim tank(s)recycled water. Recycle water piping shall be installed to a minimum of five (5’) to six (6’)feet (to top of pipe) in depth to prevent freezing, per Colorado Springs Utilitiesspecifications.


d. (If required by Colorado Springs Utilities) A Secondary Sand/Oil Interceptor shall be sizefor the car-wash facility per Colorado Springs Utilities specifications, to accommodate by-pass lines, separate systems etc.Reference: Wastewater Construction Drawing – C 2-7 Typical Sand & Oil Interceptor forAutomotive Application.

e. Connection to Colorado Springs Utilities main sanitary sewer line.

f. Location of all Sand/Oil Interceptors and its outfall location shall be shown on the approvedconstruction or utility service plans approved by Colorado Springs Utilities. (Plumbing plansmaybe requested by Colorado Springs Utilities to be attached to the approved construction orutility service plans for inspection of piping and record purposes)

g. Colorado Springs Utilities does not permit valves within its wastewater system, if a standard“plug valve” is required to be installed, it shall be on a case-by-case basis with the approvalof Colorado Springs Utilities.

Exception to the design criteria described above shall be with the approval of Colorado SpringsUtilities on a case-by-case basis.

InspectionAuthorized representatives of Regional Building Department/Colorado Springs Utilities shallmonitor and inspect the entire recycled water system including both On-site and off-sitefacilities. Regional Building Department /Colorado Springs Utilities shall conduct monitoringprograms, maintain a record as deemed necessary, and provide reports as requested by regulatoryagencies. The authorized representatives of Regional Building Department /Colorado SpringsUtilities, in carrying out these functions, shall have the right to enter the customer’s premisesduring reasonable hours. For the purpose of inspecting On-site recycled water facilities and areasof recycled water use and to ensure compliance with these Rules and Regulations. This shallinclude the provision that runoff shall be controlled and limited and the provision that cross-connections between potable water facilities and recycled water facilities.

Pipe Material and IdentificationReclaimed water piping and fittings shall be as required in this Uniform Plumbing Code forpotable water piping and fittings. All reclaimed water pipe and fittings shall be continuouslywrapped with purple-colored Mylar tape. The wrapping tape shall have a minimum nominalthickness of five ten-thousandths (0.0005) inches and a minimum width of two (2”) inches. Tapeshall be fabricated if polyvinyl chloride with a synthetic rubber adhesive and a clearpolypropylene protective coating or approved equal. The tape shall be purple in color (Pantonecolor #512) and shall be imprinted in nominal one-half (1/2) inch high, black, uppercase letters,with the words “CAUTION: RECLAIMED WATER, DO NOT DRINK”. The lettering shallbe imprinted in two (2) parallel lines, such that after wrapping the pipe with a one-half (1/2)width overlap, one (1) full line of text shall be visible. Wrapping tape is not required for buriedPVC pipe manufactured with purple color integral to the plastic and marked on opposite sides toread “CAUTION: RECLAIMED WATER, DO NOT DRINK” in intervals not to exceedthree (3’) feet. All new common areas where recycled water is used and that are accessible to thegeneral public shall be posted with conspicuous signs that include the following wording in asize no less than four (4”) inches high by eight (8”) inches wide: "RECYCLED WATER - DONOT DRINK " or " RECLAIMED WATER - DO NOT DRINK ".


All valves, except fixture supply control valves, shall be equipped with a locking feature. Allmechanical equipment, which is appurtenant to the reclaimed water system, shall be paintedpurple to match the Mylar wrapping tape.

InstallationReclaimed water pipes shall be installed in accordance with the Uniform Plumbing Code,Appendix J and all governing codes, rules and regulations set down by Regional BuildingDepartment and the City of Colorado Springs. Reclaimed water pipes shall not be run or laid inthe same trench as potable water pipes. A ten (10’) foot horizontal separation shall be maintainedbetween pressurized buried reclaimed and potable water piping. Buried potable water pipescrossing pressurized reclaimed water pipes shall be laid a minimum of twelve (12”) inches abovethe reclaimed water pipes. Reclaimed water pipes laid in the same trench or crossing buildingsewer or drainage piping shall be installed in compliance with Sections 609.0 and 720.0 of theUniform Plumbing Code. Reclaimed water pipes shall be protected similar to potable waterpipes.

Warning Labels (Tags)Colorado Springs Utilities may require warning labels, as approved by Colorado SpringsUtilities, to be installed on designated facilities such as on controller panels and wash down orblow-off hydrants on water trucks and temporary construction services where designated byColorado Springs Utilities or Inspector. The labels will notify that the system contains recycledwater that is unsafe to drink.

All recycled water sprinkler control valves, strainers, pressure regulator, isolation valves shallbe tagged with identification tags.

(1) Tags shall be weatherproof plastic, 3" x 4", purple in color with the words "WARNING -RECYCLED WATER - DO NOT DRINK", “CAUTION – RECLAIMED WATERFACILITY” imprinted on one side. Imprinting shall be permanent and be black or whitein color.

(2) One tag shall be attached to each appurtenance as follows:

(a) Attach to valve stem directly or with plastic tie wrap or

(b) Attach to solenoid wire directly or with plastic tie wrap or

(c) Attach to valve cover with existing valve cover bolt.

(d) Attach to the body of the relative appurtenance with a plastic tie-wrap.


ValvesValves used in recycled water systems shall conform to the following:

(1) All valves, manual control valves, electrical control valves, pressure reducing valves,strainers for on-site recycled water systems shall be installed below grade in a valve box.All appurtenances shall be tagged as described below. Valves shall be constructed of brasswith a purple rubber or vinyl cover or painted with purple paint to indicate “Non-potablewater”.

(2) The cover shall have a warning with the following information:

(a) "NON-POTABLE" or "RECYCLED WATER", "DO NOT DRINK",“CAUTION – RECLAIMED WATER FACILITY”

(3) The warning shall be permanently stamped or molded into the cover.

(4) Locking covers may be required, per Regional Building Department/Colorado SpringsUtilities representative.

(5) Electrical and manual control valve boxes shall have a warning label permanently moldedinto or affixed onto the lid with rivets, bolts, etc. Warning labels shall be constructed of apurple weatherproof material with the warning permanently stamped or molded into the label.The warning shall contain the following information:

(a) "NON-POTABLE" or "RECYCLED WATER", "DO NOT DRINK",“CAUTION – RECLAIMED WATER FACILITY”

1. Backwater (Backflow) ValveReference Chapter 7 Backwater (Backflow) Valve for Sanitary Sewer Service Linesof the Wastewater specifications.


Car Wash Checklist for both Recycled and Wash Only car washes.(To be submitted/attached with Utility Service Plans)

Item below are for information only and may not include all of Colorado Springs Utilities/ RegionalBuilding Department requirements:[Reference schematics of Car Wash facilities Detail Drawings in the Wastewater Construction DrawingsC 2-5,6,7]

a. Provide a copy of the mechanical plans for review in conjunction with the proposed car washutility plans.

b. Provide a detail of the internal trench drain – needs to capture initial sand/mud (if required).c. Provide a detail/cross section of the reclaim/storage tanks and sand/oil interceptor on the utility

service plan or on the attached Plumbing/Mechanical plan submitted to Records Management.d. Provide a detail of the by-pass (plug valve) valves and the backwater valve (call out- model and

make on plans) per Colorado Springs Utilities Wastewater specifications.e. Show location of by-pass valves (if any) and Backwater valve (per Wastewater Construction

detail C 2-5) on the utility service plans. [A variances maybe given for the manhole, with theapproval of the Colorado Springs Utilities for manholes that are two to (2’-3’) three feet deep, byusing a “plastic meter pit “ fitted with a standard manhole lid].

f. Recycle water lines shall be a minimum of five (5’) to six (6’) feet deep per Colorado SpringsUtilities Water specifications or wrapped in heat tape under a concrete pad to prevent freezing.

g. Show clean out’s every one hundred (100 ft) feet (if required) per Colorado Springs UtilitiesWastewater specifications.

h. Install Sand/Oil interceptors upstream of the first reclaim/storage tanks, per standard detaildrawing schematic in the Wastewater specifications.

i. The outfall line from the facility to the main line shall be a minimum of six (6”) inch diameter @1.04% grade.

j. Sign off by Plumbing/Mechanical Engineer maybe required for the Recycled/Reclaimedschematic on the Utility Service plan.

l. A (S.O.P.) – “Standard Operating Procedure” manual should be sent to Records Management,for Colorado Springs Utilities Inspection purposes only and future maintenance.

Add the following notes to plans:1. Sheets “PX to PX” attached to this utility service plan for reference only. [A copy of the plumbingplans is to be included with the final signature plans and sent to Records Management, for ColoradoSprings Utilities Inspection purposes only].2. Colorado Springs Utilities will not review the recycled water system for operational design.3. All non-potable pipes shall be purple and non-potable signs posted around the facility. (see notesin specifications).


9.10 Lint Interceptor for Laundromats. Typical applications include commercial/institutionalLaundromats and dry-cleaners. The waste discharge from these facilities usually contains highquantities of lint, silt, dissolved and suspended solids, as well as detergents.A lint interceptor is commonly referred to as a “lint trap”, typically located outside of thebuilding and buried below grade. The principle advantage is the cooling effect obtained from theearth. The buried interceptor is typically constructed of precast concrete, providing years ofcontinuous service. The interceptor contains several compartments where the lint will coagulateand float to the surface and heavier solids will sink to the bottom. The discharging effluentcomprises of the clearer water between these layers. Inlet and outlet piping shall be a minimumof four (4”) inches or the size of the building sewer whichever is greater. In traffic areas, the trapshall be designed to have adequate reinforcement and cover (including piping), meeting HS-20traffic loading specifications. Lint traps in traffic areas require a concrete driving surface overpiping with structural backfill around piping.

Maintenance. The lint interceptor should be cleaned (or pumped out) routinely to prevent theescape of appreciable quantities of grease. Cleaning should be performed when the interceptor isat 75% of lint/silt retention. The frequency of cleaning at any given installation will varydepending on use. Pumping frequencies for Laundromats usually range from once a month, toonce every six months.

Sizing Criteria for Lint Interceptors. The lint interceptor is generally sized according to theuniform plumbing code. The different variables include; number of washing machines,wastewater flow rate, wastewater detention time, and storage factor and detention time.

Uniform Plumbing Code Method: As recommended by the Uniform Plumbing Code –Appendix H, the following sizing method is as follows:

Laundromats

Basic formula = (TGC) x (CPH) x (RT) x (ST) = Size of Interceptor (gallons)

where:

TGC = Total Gallons per Cycle i.e. gallons/cycle per machine x number of machines

CPH = Cycles per Hour i.e. 2 cycles per hour

RT = Retention time depending on size of laundry:

2.5 for Institutional Laundry

2.0 for Standard Commercial Laundry

1.5 for light commercial laundry

ST = Storage factor, based on hours of operation:

1.0 – Operation of a 8 hour day

1.5 – Operation of a 12 hour day

Typical Calculation: (TGC) x (CPH) x (RT) x (ST) = Size of Interceptor (gallons)

(Number of machines x gallons/cycle) x (cycles per hour) x (retention time) x (storage factor) =Size of Interceptor (gallons)

Size of Interceptor

(_________ x ________) x (________) x (________) x (________) = __________ gallons


9.11 Swimming Pools (Indoors and outdoors). (Reference Colorado Springs, Colorado City Code,Section 7-16-101)

All swimming pools shall discharge into a sanitary sewer line. The minimum size for aswimming pool discharge trap shall be calculated based on a restricted discharge of waterof one hundred (100) gallons per minute entering the sanitary sewer line (without discharginginto the grease trap if a kitchen facility is part of the proposed structure). A detail drawing of theproposed outlet/drainage design to be shown on the approved construction or service plans, alsoshow the location/connection to sanitary sewer line.

9.12 Abandoned Interceptors and traps. Interceptors and traps abandoned in-place shall be cleanedof all debris (grease, sand, oil, etc.), the inlet and outlet pipe plugged at each end, then filled withgravel and the access area sealed, not to permit any entry into the interceptor.

9.13 Typical Abbreviations

CO – clean out (F-floor)DN – drainDW – Dish washerFD – floor drainFS – Floor sinkGT – Grease TrapGI – Grease InterceptorKS – kitchen sinkV – Vent, VP – Vent pipeW – Wastewater line3-Comp – Three compartment sink unit

TO BE ADDED TO ALL DRAWINGS THAT HAS A SWIMMING POOLFACILITY (INTERNAL OR EXTERNAL)

The minimum size for a swimming pool discharge trap shall be calculatedbased on a restricted discharge of water of one hundred (100) gallons perminute entering the sanitary sewer line.

Documents

w Wtr Chapter 9