02660-watersystems_000

7/31/2019 02660-WaterSystems_000

1/12

WATER SYSTEMS 02660-1

SECTION 02660

WATER SYSTEMS

PART 1 - GENERAL

1.01 WORK INCLUDED

A. See Section 02202 for trenching, groundwater control, pipe bedding, backfill andcompaction of backfill, dust alleviation and control, and cleanup/restoration.

B. Installation of domestic water lines and appurtenances.

C. Disinfection and testing.

D. Supplying all labor, materials, equipment and apparatus not specifically mentionedherein or noted on the plans, but which are incidental and necessary to complete thework specified.

1.02 APPLICABLE PUBLICATIONS

A. The publications listed below form a part of this specification to the extent referenced.The publications are referenced in the text only by their general designation.

B. American Society for Testing and Materials (ASTM) Publications:

A 276 Standard Specification for Stainless and Heat-Resisting Steel Bars andShapes.

A 536 Standard Specifications for Ductile Iron Castings.

D - 638 Standard Test Method for Tensile Properties of Plastics.

D - 790 Standard Test Methods for Flexural Properties of Unreinforced andReinforced Plastics and Electrical Insulating Materials.

D - 1248 Specifications for Polyethylene Plastics Molding and Extrusion Materials.

D - 1505 Test Methods for Density of Plastics by Density Gradient Technique.

D - 1603 Test Method for Carbon Black in Olefin Plastics.

D - 1693 Test Methods for Environmental Stress Cracking Ethylene Plastics.

D - 2737 Specification for Polyurethane (PE) Plastic Tubing

D 2774 Standard Recommended Practice for Underground Installation ofThermoplastic Pipe

D - 3015 Standard Practice for Microscopical Examination of Pigment Dispersion inPlastic Compounds.

D - 3035 Standard Specification for Polyethylene (PE) Plastic Pipe. (SDRPR) Basedon Controlled Outside Diameter.

D - 3261 Standard Specifications for Butt Heat Fusion Polyethylene (PE) PlasticFittings for Polyethylene (PE) Plastic Pipe and Tubing.

D - 3350 Specifications for Polyethylene Plastic Pipe and Fittings Materials.

F - 477 Elastomeric Seals (Gaskets) for joining Plastic Pipe.

7/31/2019 02660-WaterSystems_000

2/12

WATER SYSTEMS 02660-2

C. American Water Works Association (AWWA) Publications:

C -153 Ductile-Iron Fittings 3" through 48" for Water and Other Liquids.

C - 111 Rubber Gasket Joints for Ductile Iron and Gray-Iron Pressure Pipe and

Fittings.C - 219 Bolted, Sleeve-Type Couplings for Plain-End Pipe.

C - 502 Dry Barrel Fire Hydrants.

C - 503 Standard for Wet-Barrel Fire Hydrant.

C - 504 Rubber-sealed Butterfly Valves.

C - 509 Resilient Seated Gate Valves, 3 through 12 NPS for Water and SewageSystems.

C - 550 Protective Epoxy Interior Coatings for Valves and Hydrants.

C - 601 Disinfecting Water Mains.

C - 900 Polyvinyl Chloride (PVC) Pressure Pipe, 4" through 12" for Water.

C - 905 Polyvinyl Chloride (PVC) Water Transmission Pipe, Nominal Diameters 14"through 36".

M 23 PVC Pipe Design and Installation.

1.03 QUALITY ASSURANCE

A. All Work shall be done to the satisfaction of the representative of the GeotechnicalConsultant and shall meet the approval of the City Engineer.

B. Class of pipe requirements shown or called for on the plans shall be the minimumacceptable.

C. Water mains, services and appurtenances shall be subject to hydrostatic and leakagetests.

D. Water mains, services, and appurtenances shall be disinfected by the Contractor priorto connecting to existing systems.

E. Submit manufacturer's data on the pipe material, fittings, restrained joints, valves, firehydrants, and service material prior to beginning of any pipe installation.

F. Submit a plan showing the locations of all restrained joints and thrust blocks prior toinstallation of these devices.

G. The maximum allowable deflection (out of roundness) of PVC pipe under superimposedloads shall be 5%, or 75% of the manufacturers recommended maximum, whichever is

smaller.H. The Engineer may require manufacturer's certificates showing conformance with this

specification for any of the pipe materials, fittings, valves and appurtenances deliveredto the job site.

I. For Fire Service lines, the lines shall be subject to a high velocity flushing test. Methodsof flushing shall be approved in advance by the Engineer.

7/31/2019 02660-WaterSystems_000

3/12

WATER SYSTEMS 02660-3

1.04 JOB CONDITIONS

A. Comply and conform with conditions and requirements indicated and specified underSection 02202 of these specifications.

B. Contractor shall conduct operations and schedule cleanup in a manner to cause theleast possible obstruction and inconvenience to traffic, pedestrians and to adjacent

property owners or tenants.

PART 2 PRODUCTS

2.01 PVC PIPE MATERIALS

A. PVC water mains 12" in diameter or less shall be PVC pressure pipe conforming to theapplicable requirements of AWWA C900 for class 200 pipe having a dimension ratio(DR) of 14 and a ductile iron pipe equivalent outside diameter.

B. Pipes 14" in diameter or larger shall be PVC transmission pipe conforming to AWWA

C905. Pipe shall be Class 235 psi, having a DR of 18 and ductile iron pipe equivalentoutside diameter.

C. Maximum length of each section of pipe between elastomeric rings shall be twenty (20)feet.

D. Each length of pipe shall have the words "DOMESTIC WATER" stenciled with 1-5/8"high lettering in permanent ink, at 2-foot spacing along its length.

E. The Contractor may substitute pressure-sensitive tape in lieu of stenciling. AdhesiveBacked Pipe Labeling Tape shall be PVC Plastic tape manufactured specifically fordirect placement onto pipe, cable or conduit for warning and identification. Tape shall bea minimum of 2.2 mils, an adhesive strength of 26 psi, and with tensile strength of 32 lb.per inch of width. Tape shall be of the type provided in rolls, color coded for the utilityinvolved with warning and identification imprinted in bold letters continuously andrepeatedly over entire tape length. Code and letter coloring shall be permanent,unaffected by moisture or other substances contained in trench material.

2.02 COUPLINGS AND RESTRAINING DEVICES FOR PVC PIPE

A. All couplings for use on PVC pipe for water lines shall be manufactured from the samematerials and in compliance with the specifications set forth herein before for PVC pipefor water lines. Each coupling shall be equipped with two rubber rings, which fit intoindividual grooves formed in the inner wall of the coupling to eliminate blowouts or leaks.

B. Rubber rings for use with PVC pipe couplings, fittings and appurtenances shall bemanufactured from properly vulcanized rubber compounds to a uniform cross-section

free from porosity, pits and blisters in conformance with the requirements of ASTMDesignation F-477.

C. High Deflection Stop Couplings and Closure Couplings for connecting new PVC pipe toexisting PVC pipe of identical outside diameter shall be:

1. Certainteed or approved equal.

D. Flexible Couplings and Flange Coupling Adaptors:

1. Conform to AWWA C-219 Standard.

7/31/2019 02660-WaterSystems_000

4/12

WATER SYSTEMS 02660-4

2. Sleeve: Ductile iron, conforming to ASTM A-536 Standard for flange couplingadaptors and flexible couplings.

3. Followers: Ductile iron, conforming to ASTM A-536 Standard for flange couplingadaptors and flexible couplings.

4. Sleeve bolts and nuts: Type 316L stainless steel for flexible couplings and flange

coupling adaptors.

5. Coating: Fusion epoxy lined and coat, sleeve and followers for flange couplingadaptors. The flange coupling adaptors including bolt assembly shall be cathodicallyprotected using the Petrolatum Wax Tape System. See Technical SpecificationsSection 02661.

6. Pressure rating: Greater than or equal to the associated pipe rating, but not lessthan 150 psi.

7. Buried flexible coupling sleeve: Long barrel. For pipes 12 and larger, minimumsleeve length shall be 12.

8. Gaskets: Nitrile (BUNA-N), conforming to National Sanitation Foundation (NSF)

Standard No. 61.9. Manufacturers:

a. Flexible couplings:

1) Connecting pipe with identical outside diameters: Smith-Blair 411 orapproved equal.

2) Connecting pipe with slightly different outside diameters: Smith-Blair 441,or approved equal.

3) Connecting pipe with outside diameter differences up to 2-3/4: Smith-Blair R441 Reducing Couplings or approved equal.

b. Flange coupling adaptors:1) Connecting plain end pipe to flanged fittings: Series 2100 by EBBA Iron;

or approved equal.

E. Restraining Devices:

1. Conforming to ANSI/AWWA C111/A21.11 or ANSI/AWWA C153/A21.53.

2. Ductile iron castings shall conform to ASTM A-536 Standard.

3. Bolts, nuts, washers and rods shall be Type 316L Stainless Steel.

4. Pressure rating of greater than or equal to the associated pipe pressure rating, butno less than 150 psi.

5. Metallic portion shall have a factory-applied fusion epoxy coating per AWWA C213.6. Entire restraining device, including associated adjacent fitting and valves, shall be

cathodically protected with Petrolatum Wax Tape System. See Section 02661.

7. Series 1600 by EBBA Iron (4 to 12); Series 2800 by EBAA Iron (14 to 48); orapproved equal for PVC pip bell and spigot joints.

8. Series 2000 PV by EBBA Iron; or approved equal for PVC pipe mechanical jointsrestraints at pipe fittings.

7/31/2019 02660-WaterSystems_000

5/12

WATER SYSTEMS 02660-5

9. For Ductile Iron Pipe, mechanical joint restraints shall be EBBA Iron Megalug Series1100.

10. The restraint length requirements are shown on the Drawings.

2.03 FITTINGS FOR PVC PIPE

A. Fittings for use on PVC pressure pipe shall be ductile iron castings conforming to theapplicable requirements of AWWA Standard C153 for two-hundred fifty (250) psi workingpressure. Joints shall be rubber gasketed per AWWA C-111. Fittings for use on PVCpipe shall be Tyler Union or approved equal.

B. Tapping sleeves shall be Smith Blair 663 or approved equal , all type 316L stainlesssteel, with flat-faced flange to mate with standard tapping valves, with NPT test plug.

C. Fittings shall be fusion-epoxy lined and coated as specified in Section 02661 of theseSpecifications.

D. All bolt-up sets (nuts, bolts and washers) and tie rods for buried valves and fittings shallbe stainless steel, ASTM A-276 type 316L.

E. Isolated fitting and associate adjacent restraints shall be cathodically protected with aPetrolatum Wax Tap System. See Section 02661.

2.04 VALVES AND VALVE BOXES

A. Gate valves shall conform to the requirements of AWWA C509 for resilient-seatedvalves. Stems shall be, fitted with a 2" x 2" square wrench nut and shall bemanufactured to open counter-clockwise. Stem extensions shall be installed to bring theoperating nut to within two (2) feet of finish grade where the depth from finished grade tooperating nut exceeds four (4) feet. Gate valves shall be used for all valves ten (10)inches and smaller and shall be FUSION EPOXY lined and coated in conformance withthe requirements of Section 02661 of these Specifications. Gate valves shall be as

manufactured by Mueller Company, or approved equal.B. Butterfly valves shall be used for all valves 12 inches and larger and shall comply with

the latest revision of AWWA Standard C504, Class 150-B having Cast Iron Bodies, Castor Ductile Iron discs, Stainless Steel Shafts, adjustable field replaceable rubber seatsmating against Stainless Steel seat rings, and field-replaceable seals. End connectionsshall be flanged or Mechanical Joint. Wafer type valves shall not be allowed. Valveactuators shall be of the traveling nut type designed for buried service, sized to operatethe valves against 150 psi unbalanced line pressure, with field adjustable and stopscapable of withstanding input torque of 450 ft. lbs. All internal and external surfaces ofbutterfly valves shall be covered with a factory applied 2-part, polyamide cured, epoxycoating applied over a sand blasted "near white" metal surface per SSPC-SP10 to aminimum of 8 mils and a maximum of 12 mils, in compliance with AWWA Standard

C550. Butterfly valves shall be as manufactured by Mueller Company, or approvedequal.

C. Combination Air Valves: Combination air release valves, Cla-Val Series 36; equivalentby APCO; or equal.

1. Materials: Cast iron body, Buna-N seat, stainless steel float and plug, andstainless steel operating parts. Fusion bonded epoxy coated and lined, 8 to10 mils minimum.

7/31/2019 02660-WaterSystems_000

6/12

WATER SYSTEMS 02660-6

2. Operating pressure: 20 to 150 psi.

D. All bolts, nuts and washers throughout the bodies of the gate and butterfly valves shallbe stainless steel, ASTM A276, Type 316. The square wrench nut and valve stem shallbe bronze, ASTM B62, containing not more than 5% zinc and 2% aluminum. The wrenchnut cap screw attaching the square wrench nut to the stem shall be stainless steel,

ASTM A276, Type316.E. Valves shall be provided with traffic valve boxes and risers and circular cast iron traffic

covers labeled "water", set in a concrete base as shown on the Drawings.

2.05 WATER SERVICES

A. Commercial water service lines four (4) inches in diameter and larger shall be PVCpressure pipe and couplings conforming to the requirements of AWWA Standard C900for Class 200 pipe and couplings as herein specified for PVC pressure water mains.

B. Commercial, irrigation, and residential water service lines two (2) inches in diameter orless, shall be polyethylene Plastic Pipe Class 200, conforming to the requirements ofASTM Designation D2737 for the size indicated on the plans.

C. Fittings, couplings and water service material 2 inches in diameter or less shall bebronze and all nipples shall be brass of the size and type called for on the plans.

D. Service Saddles shall be double strap bronze service saddles as manufactured byMueller Company, or approved equal.

E. All new water meters will be provided by the City of Redwood City, and installed by theContractor. Existing water meters shall be left in the new water meter box after removal,for the City to pick-up.

F. Meter box and cover assembly shall be provided by the Contractor for each water meteras shown on the plans, and shall conform to the size and type shown on theEngineering Standard Details.

G. Meter box and cover assembly shall be made of solid fiberglass reinforced polymerconcrete (RPC) material, in color of concrete gray. The meter box and cover shall bemanufactured by Armocrast Products Company or approved equal. Cover shall haveWATER logo showing on top, touch read hole, with indentation of 4-1/8x1/8 deep anda hole with 1-3/4 diameter. The RPC material shall be resistant to chemicals commonlyfound in the soil or in the operating environment, and shall be tested in accordance withASTM D-543. The polymer concrete material shall be resistant to sunlight and anyclimatic condition and shall be tested in accordance with ASTM D-756, procedure E.Each meter box and cover assembly shall withstand a vertical test load of 20,800 lbs.(16,000 lbs. Plus 30% impact factor) load over a 10x20x1 thick steel plate centered onthe cover area and baked with a 10x20x1/2 rubber plate. The test loading shall notcause any failure to the box per cover. Traffic rating cover shall be used in traffic area.

2.06 FIRE HYDRANTS

A. All fire hydrant service runs shall be PVC pressure pipe as herein specified and shall besix (6) inches in diameter.

B. Fire hydrant assemblies shall consist of a six (6) inch gate valve, the run of six (6) inchpipe, cast-iron bury, and the hydrant. Use break off bolts to fasten the hydrant to thebury.

7/31/2019 02660-WaterSystems_000

7/12

WATER SYSTEMS 02660-7

C. Fire Hydrants shall be one of the four (4) different types depending on location and thesize of the watermain.

1. Type A - Mueller A-423 dry barrel or approved equal fusion epoxy lined and coated;provided with two 2-1/2 and one 4-1/2 outlets, conforming to AWWA C502.

2. Type B Clow 92 low silhouette, wet barrel or approved equal fusion epoxy linedand coated; provided with two 2-1/2 and one 4-1/2 outlets, conforming to AWWAC503.

3. Type C Clow 76 wet barrel or approved equal fusion epoxy lined and coated;provided with two 2-1/2 and one 4-1/2 outlets, conforming to AWWA C503.

4. Type D Clow 865 wet barrel or approved equal fusion epoxy lined and coated;provided with one 2-1/2 and two 4-1/2 outlets, conforming to AWWA C503.

D. All exterior metal parts of the hydrant from the ground up shall be painted with two coatsof paint, or one coat of primer and one coat of paint, in either Redwood Shores"DOLPHIN BLUE" or City Standard "LIME YELLOW", (DTM Mid Tone Base B66W102

enamel and #B66W1 primer), as appropriate to the location. Both paint colors areavailable from Sherwin Williams Company.

E. Wet barrel fire hydrants, burys and extension spools shall be epoxy lined and coated asherein specified for fittings.

F. All fire hydrant heads, burys and extension spools shall be bolted with stainless steelbolts, and washers, as herein specified for fittings.

2.07 LOCATOR WIRE

A. Locator wire for use with plastic pipe installations shall be stranded copper, eight (8)gauge type TW or THHN electrical wire with solid blue jacket.

B. Connect locator wire to metallic fittings with brass wire split nuts. All exposed metallic

wires and fittings shall be protected with Royston Handy Cap, or equal.

2.08 CONCRETE FOR THRUST BLOCKING

A. Reinforcement for concrete thrust blocking shall be deformed steel bars conforming toSection 02550 of these Specifications.

B. Concrete for thrust blocking shall be Portland Cement Concrete conforming to theapplicable requirements of Section 02550 of these Specifications.

2.09 PIPE BEDDING AND BACKFILL MATERIAL

A. Shall conform to Section 02202 of these Specifications.

PART 3 EXECUTION

3.01 TRENCHING, BACKFILLING AND SHORING

A. Shall conform to Section 02202 of these Specifications.

7/31/2019 02660-WaterSystems_000

8/12

WATER SYSTEMS 02660-8

3.02 PVC PIPE INSTALLATION

A. Installation: Install pipe, valves, fittings and appurtenances in accordance withmanufacturers instructions, and in conformance with the applicable requirements of theAWWA Standards. Rotate each length of PVC pipe so that the stenciled or taped words"DOMESTIC WATER" will be located on the top of the pipe.

B. Handling: Handle pipe, valves, and fittings carefully during hauling, unloading, andplacing operations, so as to avoid breakage or damage. Use strap-type slings for liftingand placing; no chains or hooks will be permitted. Broken or damaged pipe orappurtenances will be rejected by the Engineer and shall thereupon be removed by theContractor from the work and replaced. Repair damaged coating in accordance withcoating manufacturers recommendations.

C. Alignment: All pipe shall be accurately laid in conformity with the prescribed lines andgrades as established by the Engineer. Joint each length to the preceding section asspecified, and after said jointing has been completed, there shall be no movement of thepipe in subsequent operations.

D. Pipe Deflections: The laying of pipe on curved alignment will be permitted up to one-

half the deflection as recommended by the respective pipe manufacturer. Pipe shall notbe bent against the trench side wall.

E. Cleaning: Before each new length of pipe is placed, carefully clean the interior of thepreceding pipe of all dirt and debris. When pipe laying is not in progress, close all openpipe ends with watertight plugs in a satisfactory manner.

F. Bearing: Provide continuous uniform bearing of pipe in the trench along its bottom,except at bell holes. Place blocking used to support the pipe during laying at the end ofthe section and remove before laying the next section. Before lowering pipe into thetrench, the Contractor shall remove all stakes, debris, loose rock and other hardmaterial from the bottom of the trench.

G. Positioning: After the final positioning, hold the pipe in place in the trench with

compacted backfill material placed equally on both sides of the pipe at as manylocations as are required to hold the pipe section in place. After joints are completed,redistribute the backfill material and compact as herein required.

H. Closure: At the end of each day and when work is not in progress, close the open endsof pipe installed in the line with watertight plugs or caps.

I. Thrust Blocking: Concrete thrust blocks of the form and dimensions shown or noted onthe plans shall be provided by the Contractor at all changes in horizontal or verticalalignment and at such other points as may be called for on the plans. Thrust blocksshall be installed by the Contractor in strict conformance with the details shown or notedon the plans. When no thrust blocks are shown on the plans, the Contractor shallprovide restrained joints at all bends.

J. Restrained Joint: Install per manufacturers instructions. Length of restraint as shownon Drawings. Install Petrolatum Wax Tape System per Section 02661.

K. System Connections: Unless separately listed on the bid schedule, Contractor shallmake all required connections to existing facilities and improvements at no additionalcost, and compensation for such work shall be deemed as included in the price bid forpipe installation.

7/31/2019 02660-WaterSystems_000

9/12

WATER SYSTEMS 02660-9

3.03 COUPLING INSTALLATION

A. Flexible Couplings and Flange Coupling Adaptors: Prior to installation, thoroughly cleanoil, scale, rust, and dirt from the pipe to provide a clean seat for the gasket. Take carethat the gaskets are wiped clean before they are installed. If necessary, lubricate flexiblecouplings and flanged coupling adapter gaskets with manufacturers standard lubricant

before installation on the pipe ends. Install in accordance with the manufacturer'srecommendations. Tighten bolts progressively, drawing up bolt on opposite sides a littleat a time until all bolts have a uniform tightness. Workers tightening bolts shall beequipped with torque-limiting wrenches or other favorably reviewed type. Install anchorstuds on restrained flanged coupling adapters so as to lock into holes drilled throughpipe wall in accordance with manufacturer's recommendation.

B. Flexible Expansion Joints: Install in accordance with manufacturer's instructions.

3.04 CONNECTIONS TO EXISTING SYSTEMS

A. Do not make connections to existing systems until the new mains have beensatisfactorily disinfected and have passed all tests specified herein.

B. Perform connection of new water main to existing distribution system no later than 48hours after Bacteriological Examination Results have been received and approved bythe Engineer. If the system connection is not performed within this period of time, repeatDisinfection and Bacteriological Examination processes.

C. If the total length of the connection from the end of the new watermain to the existingwatermain is equal to one pipe length (20 feet) or less, the Contractor shall disinfect thenew pipes, fittings and valves by means of spraying or swabbing the interior with aminimum 1-5% solution of chlorine just prior to be installed.

D. If the total length of the connection from the end of the new watermain to the existingwatermain is greater than one pipe length (20 feet), the Contractor shall set the pipeaboveground, and perform disinfection and bacteriological test as outlined in paragraph3.06 of this specification section. Between the time the satisfactory bacteriological

results are receipt and the time that the connection piping is installed, the ends of thepiping must be sealed with watertight plugs or caps.

3.05 PRESSURE AND LEAKAGE TESTS

A. Preparation:

1. The Contractor shall install temporary blow-offs as necessary for testing purposesand provide all necessary material and equipment, and shall perform all workrequired in connection with the testing of the water system, as specified herein.

2. Hydrostatic and leakage tests shall be made by the Contractor only after thetrenches have been backfilled sufficiently to hold the pipe firmly in position.

3. The Contractor shall provide all water necessary for filling, flushing, disinfectionand any required tests including all labor and equipment required.

B. Hydrostatic and Leakage Test Procedures:

1. Contractor shall fill the new water main with water making sure that air is beingreleased at all high points. If chlorine tablets have been attached inside the pipeas work progresses, the main line shall be filled very slowly in order to avoiddislodging the tablets.

7/31/2019 02660-WaterSystems_000

10/12

WATER SYSTEMS 02660-10

2. The Contractor shall connect a pressure pump at the lowest elevation of the mainto be tested. The pump must have a pressure gauge and connection to a smalltank of makeup water.

3. Apply partial pressure and verify that all air has been released. Allow the pipe to

stand with pressure at least 24 hours to stabilize.

C. Test Pressure:

1. Perform pressure and leakage tests at the same time. Subject all water pipe to ahydrostatic test of at least fifty percent higher than the normal expected operatingpressure or 150 psi, whichever is larger, unless otherwise specified or directed.

2. The minimum hydrostatic and leakage pressure for fire service lines is 200 psi.

D. Allowable Leakage:

1. For domestic water and fire service lines, the duration of each leakage test shall not

be less than two (2) hours, unless otherwise specified, and during the test the pipeshall be continuously subject to hydrostatic pressure, as specified, andmeasured atthe lowest elevation.

2. Satisfactorily apply the specified test pressure by means of a pump connected tothe pipe. Maintain the test pressure for the specified time and do not allow to dropmore than 5 psi during which all exposed pipe, couplings, fittings, valves andhydrants shall be examined carefully.

3. No PVC pipe installation will be accepted if the leakage for the section of tested lineis more than the amount determined by the formula below:

7400

PND

L =

Where: L = allowable leakage, gphN = number of joints in the length of pipeline testedD = nominal diameter of pipe, in.P = average test pressure during the leakage test, psig

4. When test results indicate leakage beyond that allowed, Contractor shall conduct aleak survey of the line and repair any leaks found. The method used for leaksurvey shall be approved by the Engineer. If the Contractor does not have theappropriate leak detection equipment, a specialized firm shall be hired. After allleaks have been repaired, the leakage test shall be repeated by the Contractor until

satisfactory conformance to this specification is demonstrated.

5. Any flaw disclosed by any of the above-referenced tests shall be repaired andsatisfactorily retested by Contractor, even if the test is passed.

7/31/2019 02660-WaterSystems_000

11/12

WATER SYSTEMS 02660-11

3.06 DISINFECTION AND BACTERIOLOGICAL TEST

A. Following the Pressure and Leakage Tests and before being placed in service, all newwater lines shall be chlorinated, flushed and tested by Contractor in accordance with therequirements of AWWA Standard C651-99, and as directed.

1. Disinfection: The Contractor shall have the option of applying chlorine with tablet

method, continuous-feed method or slug method to the entire water content of theline, including services, fire hydrants and stubs, in sufficient quantity as stipulated inthe above mentioned AWWA Standard.

a. If the Contractor elects to employ the use of the "Tablet" form of chlorinationby mounting tablets into the pipe sections as they are installed, he shalldetermine the minimum number of tablets per AWWA C651-99 requirement.This method may be used only if the pipes and appurtenances are left cleanand dry during construction. The tablets shall be attached to the ceiling ofthe pipe by a food-grade adhesive. In the event that adequate disinfection isnot obtained using said minimum number of tablets, it shall be theContractor's responsibility for re-chlorination until a satisfactory result is

obtained.

b. The tablet method and the continuous feed method shall be applied at anaverage chlorine dose of 25 mg/L and provide a minimum residual of 10mg/Lafter 24 hours retention.

2. Final Flushing: After chlorination has been satisfactorily completed thoroughlyflush the lines until the chlorine content in all parts of the system has been provenby test to be comparable to the chlorine content of the City Water System.

a. Prior to flushing, the Contractor shall thoroughly neutralize the free andcombined chlorine residuals. The chemical product used for dechlorination

shall provide consistent elimination of residual chlorine without affectingwater quality. Sulfur Dioxide gas or Liquid Sodium Metabisulfite systemsshall not be allowed. The product used by Contractor for this purpose shallbe Bio-Neutralizer, with 35% concentration Sodium Sulfite dechlorinationtablets as produced by NORWECO, or approved equal. The Contractorshall submit product information sheet for review and approval by the Citybefore performing any flushing.

b. Before discharge, the pH of the water shall be within the range of 6.5 to 8.5.Neutralized water may be discharged into the storm drainage system uponsatisfactory testing.

c. Disposal of flushed water shall comply with the National Pollution DischargeElimination System (NPDES). See Specification Section 02133 StormwaterPollution Prevention of these specifications.

d. Contractor shall use caution to avoid flooding or damage to adjacentproperties or facilities.

3. Bacteriological Test: After flushing the chlorine from the water system and prior toplacing line in service, the Contractor shall engage the services of an approved

7/31/2019 02660-WaterSystems_000

12/12

WATER SYSTEMS 02660-12

Commercial Testing Laboratory, approved by the State of California Department ofHealth Services, to gather an approved number of representative water samples,the location and number of which shall be determined by the Engineer.

a. Samples shall be taken of water that has stood in the watermain for at least16 hours after Final Flushing.

b. No section of water systems will be allowed to be connected to the City'sexisting water system when any sample of water tests indicate coliformbacteria as tested by the 24 HourMembrane Filtration Method. Should thelaboratory report show that any sample taken was not acceptable(Heterotrophic plate count greater than 0), Contractor shall re-chlorinate andtest the water again as herein before specified. This process shall berepeated by Contractor until a satisfactory disinfection has beenaccomplished.

c. Contractor shall direct the laboratory to send the original report ofBacteriological Examination to the Engineer.

3.07 HIGH VELOCITY FLUSH TEST

A. This test is required for individual, dedicated fire service lines only and is to be done inthe presence of the Fire Department Inspector.

B. The purpose of the test is to clean the pipe of debris and sediment. If a large amount ofsediment is trapped in the filter, then the test shall be re-done as directed.

C. The test shall be done under maximum flow conditions, and the flushed water shall befiltered to collect any debris in the line.

D. The test may be combined with other flushing of the water main following disinfection.

* * *