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MATERIALANDINSTALLATIONSPECIFICATIONS
FORCONSTRUCTINGWATERMAINS
ANDSERVICESMATERIALS
______________________________________________________________________________
MATERIALS
1–DESCRIPTION
1.1General:
ThispartofthespecificationsshallgovernforallmaterialsusedintheconstructionofwaterdistributionfacilitiesunderthejurisdictionoftheLittletonWaterDepartment.Projectsthatwouldnecessarily
involvematerialsotherthanthoseincludedinthisspecificationshallbesubjecttotheapprovaloftheWaterDepartmentSuperintendent.Completespecificationscoveringallmaterialsnotincludedhereinshallbesubmittedforapproval.Anymaterialusedotherthanmaterialshereinspecifiedshallbeofthe
kindandtypenormallyusedintheconstructionofwaterdistributionfacilities.
1.1.1Allproductsincludedinthissectionshallconformtotherequirementsofthestandardspecificationsreferencedherein.
1.2ReferenceStandards:
A.ANSIA21.4/AWWAC104–CementMortarLiningForDuctileIronPipeandGrayIronPipeandFittings
forWater.
B.ANSIA21.10/AWWAC110–GrayIronandDuctileIronFittings,3”through48”,forWaterandOtherLiquids.
C.ANSIA21.11/AWWAC111–RubberGasketJointsforDuctileIronandGrayIronPressurePipeand
Fittings.
D.ANSIA21.51/AWWAC151–DuctileIronPipe.
E.ANSIB.16–CastIronPipeFlangesandFlangedFittings,Class25,125,250,and800.
F.ASTMA126–GrayIronCastingsforValves,Flanges,andPipeFittings.
G.ASTMB62–CompositionBronzeorOunceMetalCastings.
H.AWWAC502–DryBarrelFireHydrants.
I.AWWAC600–InstallationofCastIronWaterMains.
J.AWWAC150–ThicknessDesignforDuctileIronPipe.
K.AWWAC509–Resilient-SeatedGateValves.
L.AWWAC550–ProtectiveInteriorCoatingsforValvesandHydrants.
2–DUCTILEIRONWATERMAINS
2.1General-OnlypipematerialslistedinthissectionshallbeusedformainextensionsunlessspecificallyauthorizedinwritingbytheSuperintendent.
2.2DuctileIronPressurePipes:
2.2.1DuctileIronPipeshallbedesignedinaccordancewithAWWAC150andANSI
A21.51/AWWAC151,Class52andshallhavepush-onjointswherespecified.Pipeshallbedoublecement-linedwithsealcoatinsideandoutconformingtoANSIA21.4/AWWAC104.Push-onjointsandrubbergaskets.
2.2.2ThepipemanufacturershallsupplyLWDwithcertificatesofcompliancewiththese
specificationsandcertificationthateachpieceofductileironpipehasbeentestedatthefoundrywithBallImpressionTest,RingBendingorotherapprovedtestforductilityuponrequest.
2.2.3Ductileironpipemayberejectedforfailuretomeetanyoftherequirementsofthis
specification.
3–SERVICELINES(SeeAttachmentA)
3.1Description:
Theservicelineisthelinefromthemaintotheoutletvalveatthecustomer’smeter.Itshallconsistof
thecorporationstopatthemain,thetubingorpipe,thecurbstopandcurbbox,andameterwithvalvesonboththeinletandoutlet.LWDalsorequiresaPressureReducerbeinstalledpastthemeter,aswellasforallSillCockstobeequippedwithaHoseBibVacuumBreakerequaltoWatts#8.
3.1.1PolyethyleneServiceline:Tubingforservicesshallbepolyethylenedesignedfor200psiservice.PipeshallbeinaccordancewithAWWAC901standardforPolyethylenePressurePipe,
tubingandfittings.
3.1.2Forservicelineslargerthantwoinchesindiameter,anypipeapprovedinsectionforwatermainsshallbeused.
3.3.3Rejection:PBtubingmayberejectedforfailuretomeetanyoftherequirementsofthisspecification.
4–FITTINGS
4.1Description:
Allfittingsusedintheconstructionofwaterlinesshallbe“UnderwritersLaboratory”(UL)forapproved.
AllmaterialslistedinthissectionshallbemanufacturedinNORTHAMERICA.,unlessspecificallyauthorizedinwritingbytheSuperintendent.
4.2FittingsforDuctileIronPipe:
4.2.1FittingsshallbeCastIron,250psipressurerating,orDuctileIron,350psipressurerating,conformingtoANSIA21.10/AWWAC110withmechanicaljoints.CompactDuctileIronFittings
conformingtoANSIA21.53/AWWAC153willbeacceptable.Jointsshallbefurnishedwith
ductileironretainingglands.RetainingglandsshallbeROMACINDUSTRIES,INC.GRIPRING™PIPERESTRAINER,oranapprovedequal.Glandsusingsetscrewswillnotbeacceptable.Fittings
shallbedoublecement-linedandseal-coatedinsideandoutinaccordancewithANSIA21.4/AWWAC104.Teesforhydrantbranchesandforstubsforfutureuseshallhavemechanicaljointsontherunwithaplain-endhavinganintegralrotatingglandonthebranch
(Anchor-tees).Theglandwillanchormechanicaljointpipeorvalveendstotheplainendofthepipe.
4.2.2AllDuctileandCastIronPipeandfittingsshallbeclean,sound,andwithoutdefects.Thecastingsshallbesmoothandfreefrompinholes,excessiron,etc.Thecoatingsshallbe
continuous,smoothandneitherbrittlenorsticky.
4.3BrassWaterServiceFittings/ServiceBoxes:
4.3.1General-StopsandFittingsfurnishedunderthesespecificationsshallbeofthesizeandtypespecified,withallpartsofbrass,conformingtoAlloyNumber4A(ASTMDesignationB62)whichhasanominalcompositionof85%copperand5%eachoftin,lead,andzinc,plusor
minus1%.Allstops,cocks,andfittingsshallbefullsizeopenings,throughout,ofthesizespecified.
Allcastingsshallbesmooth,freefromburrs,scales,blisters,sandholes,anddefectsofeverynaturethatwouldmakethemunfitfortheuseforwhichtheyareintended.
Nutsshallbesmoothcast,withsymmetrical,hexagonalwrenchflats.
4.3.2CorporationsshallbeAWWAcorporationvalveinletthreadbycompressionfitting,
meetingtherequirementsofANSI/AWWAC800-89,Mueller25008orequivalent.Theyshallbedesignedtorotateabouttheaxisoftheflowpassagewaywithinacircleofrotationsmall
enoughtoproperlycleartheinsideofanystandardtappingmachineofappropriatesize.
4.3.3CurbStopsshallbecompressionfittingmeetingtherequirementsonANSI/AWWAC800-89.Mueller25209orequivalent.
4.3.4ServiceBoxesshallbeErieBoxPlugStylewith36”StainlessSteelRodwithstandard4.5–5.5feetboxeswithastandardplugcoverwithbrasspentagonplug.Eachboxwillbefittedwith
a36’serviceroadandtheboxshallbemanufacturedinU.S.A.
SECTION5–WATERMAINVALVES
5.1ResilientSeatedGateValves:
5.1.1ValvesshallbeResilientWedgeGateValve,WATEROUSSeries500orequivalentmeetingAWWAC509ofthelatestrevision.Allboltsshallbestainlesssteel.Valvesshallhaveanunobstructedwaterwaywhenfullyopenedequalindiametertoatleast¼”greaterthanthe
nominalvalvesizes.Valvesshallhavemechanicaljointend.ValvesusedinconjunctionwithRomacTappingSleevesshallhaveaflangeend.
5.1.2Allinternalsurfacesshallbecoatedwithepoxytoaminimumthicknessof4mils.Said
coatingshallbenon-toxic,impartnotastetowaterandshallconformtoAWWAC550oflatestrevision.
5.1.3ValvesshallbeprovidedwithtwoO-ringstemseals.BothO-ringsshallbelocatedabovethethrustcollar.Thesealingmechanismshallprovideadualsealwithzeroleakageatthewater
workingpressurewheninstalledwiththelineflowineitherdirection,andshallconsistofaductileirongatehavingavulcanizedsyntheticrubbercoatingwithnorubbermetalseamsoredgesinthewaterwaywheninthefullyclosedposition.
5.1.4AllvalvesshallbeseattestedattheratedworkingpressureinaccordancewithSection6
ofAWWAC-509.Valveshallberatedat200psiworkingpressureand400psitestpressure.
5.1.5ValvesshallOPENLEFT.
5.2TappingSleeveandValve:
5.2.1TappingsleeveshallbeRomacStainlessSteelorequivalent,meetingAWWAC223.
5.2.2Themechanicaljointsleeveshallhavelongitudinalcompoundrubbergasketswhichshall
fitagainsttherubberendgasketsthusaffectingatotallyenclosedrubberwater-tightseal.
5.2.3Tappingsleeveshallhaveaflangewith“O”ringsealanddrilledtocorrespondtothatofthetappingsleevetoinsureproperalignment.
5.3ValveBoxes:
5.3.1Valveboxesshallbestandardcast-iron,asphaltcoated,adjustable,slidingtype,together
withcast-ironcoverswiththeword“Water”plainlycastinreliefonthetopsurface.AllValveBoxesshallbemanufacturedinNorthAmerica.
5.3.2ThebottomsectionshallhaveaminimumI.D.of5-¼”.Thetopsectionshallhavea
minimumdiameterof6-⅛”.Thereshallbeaminimum6”overlapbetweensections.
5.3.3Thebottomsectionshallbe36”inlengthforallgatevalves.Thetopsectionshallbeatleast26”inlengthandhaveaplainbottom.Nothreepiececombinationsshallbeacceptable.
5.4.5Valveboxesshallbecompletelyandthoroughlycoatedwithbitumasticpaint.
6–FIREHYDRANTS
6.1General:
6.1.1Hydrants–TheLittletonWaterDepthasstandardizedontheWaterusWB-67orClowMedallion.AllHydrantswillbe“OPENLEFT”.HydrantsshallconformtotherequirementsofAWWAC-502,andbedesignedfor150psiworkingpressuretestedto300psihydrostatic
6.1.2Hydrantsshallbeabletoberotated360degrees.Theyshallhaveapositiveclosing,self-
cleaningdrainvalveanddrainageareashallbecompletelybronzeorbrasslined.
6.1.3HydrantsshallbepaintedyellowtomatchtheTown’sstandardcolor.Inaddition,twocolumnswillbeinstalledtoprotecthydrantsfromvehiculartrafficandsnowplows.Columnsshallbepaintedyellowtomatchhydrants.
6.1.4HydrantExtension–MUSTBEapprovedbyLWD,andshallbeprovidedbythesame
manufacturerashydrants.Extensionshallincludebarrel,rod,coupling,bolts,gaskets,andallotheraccessoryequipmentforacompleteinstallation.
SECTION7–METERS
7.1Description:
Thissectioncoverswatermeters⅝inchto2inches.Aspecialdetailwillbesubmittedforapprovalformeterslargerthantwoinches.
7.2MetersmustconformtoAWWAStandardC-700,latestedition.
7.3AsofSeptember1,2003,LWDwillcharge$300.00fora¾”and$360.00fora1”metersetupfornewinstallations.Theownershallprovideashut-offvalveadjacenttoandonthehousesideofthe
meter.Watermustbeshutofffromthemeterincoldweatherorthemeterotherwiseprotectedfromfrost.Anypersonallowingtheirmetertobedamagedbyfrostorotherwisewillbeheldresponsibleforthecostofmakinggoodthesame.Formetersizesoneandone-halfinch(1½”)orgreater,itisthe
responsibilityoftheowner/customertosupplysaidmeterandshut-off,inaccordancewithLWDSpecifications.Allmeterslargerthan1”shallbeapprovedbyLWD.
7.4.LWDrequiresapressurereduceronthehousesideofthemeterbeinstalledbyalicensedplumberpriortofinalsignoff.
8–THRUSTBLOCKS
8.1Blocks–ThrustblocksshallbeSolidPrecastConcreteBlockplacedbetweenbackoffittingandtrenchwall,inamannertopreventblowoffofthefitting.
8.2Rodding–Inareaswherethrustblocksareunabletobeusedtoproperlyrestrainthefittings,
threadedrodsshallbeusedtoanchortheconnectiontothemain.
SECTION9–PIPEBEDDINGANDBACKFILL
9.1Bedding:
9.1.1Beddingsandshallbeusedforductileorplasticpipe.Sandshallbefreeofstones.Aminimum8”–12”ofbeddingsandshallbelaidbeneaththepipe,andextend18”overthepipe.Beddingsandshallbeextendtothewidthofthetrench.
9.2Backfill:
9.2.1Backfillingshallbedonewithgoodearth,sandorgravelandshallbefreefromlargerocks
orhardlumpymaterial,unlesstherocksorlumpsarenotmorethanapproximatelyfour(4)inchesingreatestdiameterandarescatteredinthesoil.Nomaterialofaperishable,spongy,orotherwiseunsuitablenatureshallbeusedinbackfilling.
SECTION10–METERBOXES
10.1MeterBoxesfor⅝Inchand1InchMeters:
Meterboxesfor⅝inchthru1”inchmetersshallbeasdepictedbelow.DimensionsofmeterboxandlidareintheStandarddetails.
Meterboxlidsshallbecastironasperstandarddetails.SEEBELOW
10.2MeterBoxesforMetersLargerthan1Inch:
MeterboxesshallbeQualityWaterProduct1.5”–2”MeterPitorequal.
10.3MeterBoxesforMetersLargerthan2Inch:
Meterboxesshallbemadeofconcreteblocks,bricksorpouredconcretefourinchesthickorgreater.Concreteshallbe3000lb.minimumat28days.
Coversforthesemeterboxesshallbemadeofsteelasperdesignandplans.Thesteelshallbestrongenoughtohandlethetrafficload(ifany).
Thewallsofthemeterboxesshallbecoatedwithabituminoussealantinsideandoutside.The
steellidsshallbebituminouscoatedtopreventrust.Lidsshallbeasperspecialstandarddetails.
SECTION11–TRACEWIRE
11.1Tracewireshallbelaidwithallnon-metallicpipeasperstandarddetails.
Traceshallbefourteen(14)gaugesinglestrandplasticcoatedcoppertracewire.
CONSTRUCTIONOFWATERMAINS
SECTION1–GENERAL
1.1Thispartofthespecificationshallgoverntheconstructionproceduresusedintheinstallationof
waterlinefacilitiesunderthejurisdictionoftheLittletonWaterDept.ConstructionproceduresotherthanthoseoutlinedinthisspecificationshallmeetwiththeapprovaloftheUtility.Completespecificationscoveringanyunusualorspecialconstructionprocedureshallbesubmittedforapproval
andapprovalmustbereceivedpriortobeginninganyconstructionoperations.
SECTION2–EXCAVATIONANDBACKFILL
2.1Description:
Thissectioncoverstheexcavationandbackfillofwaterlines,andappurtenances.
2.2TrenchExcavation:
2.2.1Thesidesoftheexcavationshallbecutassuchaslopethatwillpreventcaving.Inareas
wheresoilconditionspermitnormalexcavationofthetrench,thesidesshallbecutasnearlyverticalaspossiblefromthebottomofthetrenchtoapoint12”abovethetopofthepipewhenitislaidtograde.Maximumandminimumwidthsofthetrenchshallbeasshownintheplans.
2.2.2Incavinggroundorinwet,saturated,orflowingmaterials,thesidesoftheexcavationshall
beadequatelysheetedandbracedsoastomaintaintheexcavationfreefromslidesorcave-insandsafeforworkmen.Sheetingandshoringshallnotberemoveduntiltheexcavationhasbeenbackfilledtoasufficientdepthtopreventcaving.
2.3TrenchBottom:
TheentirelengthofthewaterlineshallbefoundedonbeddingspecifiedinPipeBeddingand
BackfillMaterials.
2.4DisposalofExcavatedMaterials:
Excavatedmaterialshallbepiledadjacenttotheworktobeusedforbackfillingasrequired.Excavatedmaterialswhichareunsuitableforbackfillingandexcessmaterialshallbedisposedlegallydisposedofatcontractor’sexpense.
2.5UseofExplosives:
Intheeventtheuseofexplosivesisnecessaryfortheefficientprosecutionofthework,theContractor
shallnotifytheSuperintendentinadvanceoftheiruseandshallexerciseeveryprecautiontopreventdamagetoadjoiningimprovementsorpropertybyreasonoftheiruse.Anydamagetoprivateproperty
resultingfromtheuseofexplosivesshallbetheliabilityoftheContractor.Inallcaseswheretheexplosivesarenecessary,apermitfromthelocalgovernmentagencyshallbeobtainedpriortotheir
use.
2.6Backfilling:
2.6.1WaterLines:
2.6.1.1Backfillingofwaterlinesshallincludetherefillingandconsolidationofthefillintheexcavationuptothesurroundinggroundsurfaceorroadgradeatcrossings.Itisessentialthatthecompletebackfillbedoneinsuchamannertominimizevoidsinthe
backfill.
2.6.1.2Backfillinguptothepoint12”abovethetopofthepipeshallbedonewithgoodearth,sand,orgravelandshallbefreefromlargerocksorhard,lumpymaterials.Nomaterialsofperishable,spongyorotherwiseunsuitablenatureshallbeusedin
backfilling.
2.6.1.3BackfillofPipe:
Rigidpipe(concrete,castiron,orasbestoscement)shallbebackfilledwithselectmaterialsofthepropermoisturecontenttoobtainasupportunderthelower½ofthepipe,compactedtoadensityof90%AASHTOT-180modifiedorbetter.Theintentisto
cradlethepipesothatthefilllengthofeachjointisuniformlysupportedonfirmbeddingandtheweightofpipeandfillisborneuniformlybythelower½ofthepipebarrel.Tampingoffillbelowthespringlineofthepipemaybebyhandtampsprovided
therequireddensityisobtained.
Wheretrenchesarenotunderexistingorproposedpavedareas,backfillshallproceedwiththesameselectmaterialshandplacedtoapoint12”overthetopofthepipe.
Backfillmaythenproceedbywhatevercommonlyusedconstructionmethodsasareconsistentwiththeintegrityofthepipeline.Backfilloutsidetheexistingorproposedpavedareasshallbeleftslightlyoverfulltoallowforsettlement.
Wheretrenchesareunderexistingorproposedpaveareas,theentiretrenchuptoa
point2’belowexistingorproposedsubgradeshallbebackfilledwithselectmaterialsandcompactedtoadensityof90%AASHTOT-180modifiedorbetter.Theremaining2’shallbesimilarlybackfilled,buttheminimumcompactionshallbe95%AASHTOT-180
modified.
Thebackfillofmaterialsintrenchesunderexistingorproposedpavedareasshallbecompactedwithmechanicaldevicesmanufacturedforthatpurposeformtwofeetabovethetopofthepipetothetopoftheexistingorproposedsubgrade
SECTION3–DEWATERINGOFTRENCHES
3.1Description:
Thissectioncoversthedewateringoftrenchestotheextentthatbeddingmaterialandwaterpipecanbeplacedondry,firmtrenchbottom.
3.2Wellpointing:
Wellpointingwhererequiredtokeeptheexcavationdryandthesubgradestable,shallbeinstalledwhentheexcavationiswithinaminimumoftwo(2)feetofthewatertable,exceptashereinafterprovided,
andshallbeincontinuousoperationuntilbackfilliscompletedtothislevel.Whenconstructionequipmentistobeoperatedinanareathathasbeenexcavatedandwellpointingisrequiredtokeeptrenchexcavationdryandthesubgradestable,thewellpointshallbeinstalledwhentheexcavationis
withinaminimumoffive(5)feetofthewatertable.Thereshallbesufficientpumpingequipment,ingoodworkingorder,availableatalltimes,toremoveanywaterthataccumulateswhenthepipelinecrossesnaturaldrainagechannels,theworkshallbeconductedinsuchamannerthatunnecessary
damageordelaysintheprosecutionoftheworkshallbeprevented.Provisionshallbemadeforthesatisfactorydisposalofsurfacewaterpumpedsoastopreventdamagetopublicorprivateproperty.
3.3TrenchDewatering:
DewateringoftrenchesotherthanbywellpointingshallbeaccomplishedbywhatevermeanselectedbytheContractor,however,beddingmaterialorpipemaynotbeplacedinwetorunstabletrenches.Soil
thatcannotbeproperlydewateredshallbeexcavatedanddrymaterialtampedinplacetosuchadepthasmayberequiredtoprovideafirmtrenchbottom.
3.4SurfaceRunoff:
Surfacerunoffwatershallbedivertedawayfromthetrenches.Suchdiversionshallbeintoexistingdrainagestructuressuchasstormsewers,ditchesorstreams.Diversionofsurfacerunoffshallbeinsuch
amannertopreventfloodingofstreetsorprivateproperty.
3.5DispositionofWaterfromDewatering:
Allwaterremovedfromthetrenchesbywellpointingoranyothermeansshallbepumped,pipedordrainedintoexistingdrainagestructures,suchasstormsewers,ditchesorstreams.Thedispositionofwaterfromdewateringoperationsshallbeaccomplishedinamannerthatwillpreventthefloodingof
publicorprivateproperty.
SECTION4–SHEETINGANDSHORING
4.1Description:
Thissectioncoversthesheetingandshoringtoprotectthesafetyofworkers,providesuitablemeansfor
constructingthewaterline,andtoprotectpublicorprivateproperty,includingexistingutilities.
4.2Cave-ins:
Wheretrenchcave-insareapossibility,adequatesheetingand/orshoringshallbeprovidedsoastomaintainthetrenchfreefromslidesorcave-insandsafeforworkmen.
4.3ExistingStructures:
Whereexistingbuildings,otherutilities,streets,orotherstructuresareincloseproximitytothetrench,
adequateprotectionshallbeprovidedbytheuseofsheetingandshoringtoprotectthestructurefrompossibledamage.
Inthecaseofstreetsorutilities,theContractormayelecttoremovethestreetorutilityprovidedthattheremovalandsubsequentreplacementmeetswiththeapprovaloftheTownofLittleton,theutility
owner,orwhoeverhasjurisdictionofthestructure.Inallcases,itshallbetheresponsibilityoftheContractortoprotectpublicandprivatepropertyandanypersonorpersonwhomight,asaresultoftheContractor’swork,beinjured.
SECTION5–PIPELAYING
5.1Description:Thissectioncoversthelayingofpipeforwaterlines.
Eachjointofpipeshallbeinspectedcarefullybeforebeingplacedinthetrench.Anyjointfoundtobecrackedorotherwisesodamagedastoimpairitsusefulnessshallbeplainlymarkedinsuchamanner
thatthemarkingswillnotruborwashoff.Damagedjointsshallberemovedfromthesiteassoonasfeasible.
5.2PipeLaying:
5.2.1Allpipeandfittingsshallbeinstalledtothelineandgradeasdetailedontheplans.SubjecttotheapprovaloftheEngineer,otherfittingsmaybeaddedtoorsubstitutedforthoseshown
ontheplans,shouldtheneedariseduringconstruction.ThispermissivestipulationinnowayshallrelievetheContractoroftheresponsibilityforfurnishingandinstallingallfittingsrequiredforacompleteandproperinstallationofmainasdetailedontheplans.
• Properfacilitiesshallbeprovidedforloweringsectionsofpipeintotrenches.Underno
circumstancesshallpipebelaidinwaterandnopipeshallbelaidwhentrenchconditionsorweatherareunsuitableforsuchwork.Fullresponsibilityforthediversionofdrainageandfordewateringoftrenchesduringconstructionshallbebornebythe
Contractor.• Alldirtandotherforeignmattershallberemovedfromtheinsideofpipeandfittings
beforetheyareloweredintothetrench.Theyshallbekeptcleanduringandafter
laying,careshallbetakentokeepdirtoutofthejointingspace.• Spigotandbellsshallbecleanedthoroughlybeforetheapplicationoflubricantand
attachmentofthegasketshallbeinstrictaccordwiththejoint.
• Allfittingsshallbetightenedusingtorquewrenchestothemanufacturer’sspecifications.
• Attheendofeachday’swork,andwhenpipelayingisdiscontinuedforanappreciableperiod,openendsofpipeshallbeclosedwithacastplugorcapfirmlysecuredinplace.
• Allpipeandfittingsshallbeloweredcarefullyintothetrenchinsuchmannerasto
preventdamagetopipe,fittings,orlinings.Neitherpipenorfittingsshallbedroppedordumpedintothetrench.
• Cuttingofpipe,whereneeded,shallbedoneinaneatandworkmanlikemanner
withoutdamagetopipeorpipelining.• Deflectionsshallnotexceedthemaximumrecommendedbythepipemanufacturer.• Allnon-metallicpipesshallhavetracewiremeetingrequirementsofSectionMW12,
“TraceWire”ofthesespecificationsasperstandarddetails.• Backfillingshallnotbeundertakenuntilwatermaininstallationhasbeeninspectedand
approvedbyLWD.
5.3EarlyWarningTape:
Earlywarningtapeorwireshallbeinstalledintrenchontopofpipebeddingsand.
SECTION6–TAPS
6.1ServiceTaps:
6.1.1General:
Taps:Tapsfortransmissionofwaterorairfromthemainintosystemserviceaccessoriesaredefinedasfollows:
a.Standardinternalpipethreadedholesinthewallofwatermains;thesetapsmaybeeither
manufacturedintothepipeorinstalledinthefield.
b.Tapinstallationsthataremadebyclampingabronzeserviceclampequippedwithasealedthreadedportontheperipheryofthemainthendrillingthroughthepipewalltocompleteeachserviceport.
c.Whenadirecttapismade,pipedopeorTeflontapeshallbeappliedtothethreadedpartof
thecorporationstop.
d.Serviceswillonlybeprovidedfromdedicatedeasements,alleyadright-of-ways.
e.Tapswillbelocatedinsuchamannertoprovidetheshortestdistanceandmostdirectlinetothemeter.
f.Effortshouldbemadetoallowforthecorporationtobesetateither10o’clockor2o’clock.
6.1.2TappingAsbestos-CementPipe:
Asbestos-cementpipeshallbetappedbytheuseofatappingsaddlewithdoublestainlesssteelstraps.
6.1.3TappingCastIronPipe:
Castironpipefour(4)inchesindiameterandsmallershallbetappedbytheuseofatapping
saddlemadeofbronzeorstainless
6.1.4TappingDuctileIronPipe:
DuctileIronPipeshallbetappedthesameascastironpipe,SectionCW8.1.3above.
6.1.5TappingPVCPipe:
PVCpipeshallbetappedthesameascastironpipe,SectionCW8.1.3above.
6.1.6TappingConcretePressurePipe:
ConcretepressurepipeshallbetappedbytheuseofabronzeorstainlesssteeltappingsaddleasinCW8.1.1.babove.TapshallbemadeaccordingtoPipeManufacturer’sspecifications.Aftertapismade,tapshallbecoveredwithmortarconformingtoMW13.1“Mortar”ofthese
specifications.
6.2MainTaps:
6.2.1WetTaps:
WetconnectionsshallbeusedforallconnectionsexceptwheredirectedbytheEngineer.WetconnectionsshallbemadewithatappingsleeveandvalveconformingtoMW5.3“TappingValvesandSleeves”ofthesespecifications.Eitherairdrivenormanualtappingmachinesmayb
used.Thepipetobetappedshallbecleanedthoroughlyandwirebrushedtoremoverustandotherforeignmatter.Thetappingsleeveshallbeputonandtighteneddownsecurely.Thevalveshallbeputonthesleeveandbracedagainstmovement.Thenthetapshallbemade.
6.2.2DryTaps:
DryconnectionsshallonlybemadewhendirectedbytheEngineerand/orwhenafittingmustbeaddedtoanexistingline.Fordryconnections,theexistinglinemustbeshutoffanddrained.Thisshouldbedonesothatdowntimeofthelineshallbeasshortaspossible.Afterlinehas
beendrained,thelineshallbecutandthefittingputinandblocked.Thesectionolinecutintoshallbetestedandsterilizedaswouldanewline.
SECTION7–HYDRANTS
7.1Description:
Thissectioncoversconstructionmethodsusedinsettingfirehydrants.AllfirehydrantsshallconformtoSectionMW6–“FireHydrants”.
7.2Excavation:
Excavationforfirehydrantsshallbeneatandshallleavebackoftrenchandbottomoftrenchundisturbedearthforconcreteblocking.
7.3Installation:
Firehydrantsshallbeinstalledasperstandarddetails.Astandardsix-inchgatevalveshallbebetween
themainandhydrant,asperstandarddetails.Six(6)inchDuctileironwaterline,meetingrequirementsMW2.2–“DuctileIronPressurePipe”ofthesespecifications,orSwivaladaptersshallbeusedtoinstallfirehydrants.
7.4Backfill:
Backfillshallbeasperstandarddetails.Concretelockingshallbeputunderneathandbehindhydrant.At
leastseven(7)cubicfeetofcrushedstone,average¾inchdiameter,shallbeplacedaroundhydrantasperstandarddetailsfordrainageofhydrantbarrel.Fabricshallbeplacedabovestonetoprovideaseparationbarrierbetweenbackfillandstone.
SECTION8–PAVEMENTREPAIRS
8.1Description:
Thissectioncoverstheconstructionmethodstobeusedintherepairofroads,streets,orotherpublicrights-of-way.
8.2PermanentRepairs:
8.2.1Asphaltconcretehotmixsurfacecourseconstructionshallmeetwiththecurrent
requirementsoftheLittletonHighwayDepartmentSpecificationsortheMassDOTSpecificationsfortheconstructionofasphaltconcretehotmixsurfacecourseorasotherwiseapproved.
8.2.2ConcretepavementrepairsshallmeetwiththecurrentrequirementsoftheMassDOT
SpecificationsortheLittletonHighwayDepartmentSpecificationsfortheconstructionofconcreterigidpavements.
8.2.3GravelsurfacingshallmeetwiththecurrentrequirementsoftheLittletonHighwayDepartment
8.2.4Allpermanentrepairsofstreets,roads,orotherpublicrights-of-wayshallmeetwiththeconstructionrequirementsofthegoverningagencyorprivateownerandshallmeetwiththe
requirementsofalllocalOrdinances,Regulations,Permits,orCodesgoverningtherepairstoroads,streets,orotherrights-of-way.
8.3TemporarySurfacing:
MethodsoftemporarysurfacingshallmeetwiththerequirementsofParagraph14.2orasotherwiseapprovedtoadequatelymaintaintrafficandproperdrainage.
SECTION9–CONSTRUCTIONWITHINCITYRIGHT-OF-WAY
9.1CityStreets:
LittletonHighwayDepartmentandMassDOT(whenapplicable)shallbenotifiedpriortoanystreetcuts.Properpermittingshallbeobtainedpriortoopeningofanycitystreets
Ifcitystreetshavetobeclosed,theLittletonFire,PoliceandHighwaydepartmentshallbenotifiedof
closing.Properbarricades,warningsigns,lightsandwatchmenshallbeemployed.Workshallbeprosecutedinsuchamannerthatone-halfofthetraveledportionoftheroadisopentotrafficunlessapprovedbyLittletonPoliceDept.inwriting.
Right-of-wayshallbeleftinaneatandorderlymannerandleftinasgoodorbettershapethanitwas
beforeconstruction.
9.2Easements:
Easementsshallbeleftinaneatandorderlymanner.Easementsshallbeleftinasgoodorbettershapethanthatbeforeconstruction.
SECTION10–EXISTINGSTRUCTURES
10.1General:
NotreesorexistingstructuresshallberemovedunlessapprovedbytheSuperintendent.Allexistingstructures,improvements,andutilitiesshallbeadequatelyprotected,attheexpenseoftheContractor,fromdamagethatmightotherwiseoccurduetoconstructionoperations.TheContractorshallbeliable
fordamagetoanyutilitiesresultingfromhisoperation.Duringconstruction,allfirehydrants,valveboxes,fireorpolicecallboxes,andotherexistingutilitycontrolsshallbeleftintact,unobstructedandaccessible.
SECTION11–STERILIZATION
11.1Description:
Thissectioncoversmethodsforsterilizationofwaterlinesandfacilities.BeforewaterlinesaresterilizedtheymustfirstbepressuretestedaccordingtotherequirementsofPartTW–“TestingofWaterMains”ofthesespecifications.Waterlinesalsomustbeflushedtoremovedirtandotherforeignmatter.
11.2Flushing:
Aservicetapmustbeputononeendofthewaterlinetoallowentryofflushingwaterandsterilization
water.ThetapshallbedoneaccordingtotherequirementsofCW8–“ServiceTaps”ofthesespecifications.
FlushingshallbedonewithcleanwaterfromtheTown’ssystemuntilwaterleavingtheotherendofthemainisclear.
11.3Sterilization:
Chlorineshallbeusedtosterilizethepipelinebythefollowingmethod:
Theamountofchlorineappliedshallbesuchastoprovideadosageofnotlessthanfifty(50)partsper
million.ThechlorinatingmaterialshallbeintroducedtothewaterlinesanddistributionsysteminamannerapprovedbytheEngineer.Afteracontactperiodofnotlessthaneight(8)hours,thesystemshallbeflushedwithcleanwateruntiltheresidualchlorinecontentisnotgreaterthan0.2partsper
million.Allvalvesinthelinesbeingsterilizedshallbeopenedandclosedseveraltimesduringthecontactperiod.
Thecostoffurnishingthechlorine,labor,tools,equipment,andtestsofchlorinecontentandbacteriologicaltestswillbeattheexpenseoftheContractor.Nowatermainsshallbeplacedinservice
untilasatisfactorytestreporthasbeenreceivedfromanapprovedlaboratory.
TESTINGOFWATERMAINSECTION
SECTION1–GENERAL
1.1Thispartofthespecificationsstipulatestestrequirementsformaterials,constructionmethods,and
leakage,pressureandbacteriologicaltestsofthewaterlines.TestingformaterialsandconstructionmethodsshallbeattheDeveloper’soptionexceptasstipulatedherein.TheLittletonWaterDepartmentmayrequiretestsasoutlinedinthesespecificationsformaterialsandconstructionproceduresif,inthe
opinionoftheWaterDepartment,thequalityofmaterialsandtheconstructionproceduresdonotmeettherequirementsstipulatedherein.
Inallcases,leakage,pressureandbacteriologicaltestsshallbeperformedonwaterlinesasspecifiedinthesestandardspecifications.
SECTION2–HYDROSTATICTESTING
2.1DuctileIronPipe:
Assoonasacontinuoussectionofnewwatermainhasbeeninstalled,theContractorshallproceedimmediatelytocompletealltestingandsterilizing,makeallconnections,andplacethosesectionsin
service.TheContractorshallfurnishalllabor,materials,tools,andequipmentnecessarytobulkheadandsealoffthelinefortesting,coordinatewiththeLittletonWaterDept.toflush&fillthenewlyconstructedmainwithwater.
Unlessotherwiseindicated,thepipelineshallbetestedwithahydrostaticpressureofnotlessthantwo
hundred(200)poundspersquareinchmaintainedoveracontinuousperiodofnotlessthantwo(2)hoursbyanindependentthirdpartycontractorwhoperformswatermainpressuretestingonaregularbasis.Afterasuccessfulcontinuouspressureperiodoftwo(2)hourshasbeencompleted,the
contractorshallchlorinate(seesection11–Sterlilization)thewatermainusingathirdpartycontractor.
Thecostoftesting,finding,andrepairingtheleaksandretesting,shallbeattheexpenseoftheContractor.ThewaterrequiredtofillthelineswillbefurnishedbytheOwner,withoutchargetotheContractor.
2.2PVCPressurePipe:
Assoonasacontinuoussectionofnewwatermainhasbeeninstalled,theContractorshallproceed
immediatelytocompletealltestingandsterilizing,makeallconnections,andplacethosesectionsinservice.TheContractorshallfurnishalllabor,materials,tools,andequipmentnecessarytobulkheadandsealoffthelinefortesting,fillitwithwater,raisethefilledlinetotestpressure,andmeasurethe
amountofleakageoverthetestperiod.Unlessotherwiseindicated,thepipelineshallbetestedwithahydrostaticpressureofnotlessthanthatpressurethepipeisratedat(i.e.,class200testpressure200
psi)maintainedoveracontinuousperiodofnotlessthanfour(4)hours.Afterasuccessfulcontinuouspressureperiodoffour(4)hourshasbeencompleted,atestforthedeterminationofamountofleakage
shallberunatthesamepressureasbeforeforadurationoftwo(2)hours.Ifthetestsindicatealeakageinexcessofarateequaltoten(10)gallonsperinchofinternalpipediameterpermileofpipelinepertwenty-four(24)hours,theContractorwillberequiredtofindandeliminatetheleak.Allknownleaks
shallbestopped,regardlessofthetestrequirement.
Thecostoftesting,findingandrepairingtheleaksandretesting,shallbeattheexpenseoftheContractor.ThewaterrequiredtofillthelineswillbefurnishedbytheOwner,withoutchargetotheContractor.
SECTION3–BACTERIOLOGICALTEST
3.1AfterasectionofwatermainhasbeensterilizedandflushedaccordingtoSectionCW19–“Sterilization”ofthesespecifications,theUtilityshallbenotifiedtopickupasample.Abacteriologicaltestshallberuntodeterminewhethercoliformorganismsarepresent.Ifcoliformorganismsarefound
thelinewillhavetoberesterilizedasperSection11.3ofthesespecifications.
TheContractorwillbenotifiedastotheresultsofthetest.Thetestrequires48hourstocomplete.
ASBUILTDRAWINGS
SECTION1–GENERAL
1.1ThispartofthespecificationsstipulatestestrequirementsfortheprovisionofASBUILTdrawingsofworktobeprovidedtotheLittletonWaterDept.AllcostsassociatedwithprovidingaccurateASBUILTdrawingstoLWDshallbetheresponsibilityofthecontractor.
SECTION2–SERVICEASBUILT
2.1Atthecompletionoftheinstallation,andpriortoawatermeterbeinginstalled,thecontractorshallprovidetoLittletonWaterDeptanASBUILTdrawingdepictingthefollowing:
• CurbStop• WaterLinewithDesignationastothesize.
• Locationwheretheserviceentersthebuilding
AllASBUILTDrawingsshallhaveaminimumoftwo(2)tiesfrompermanentstructures(i.e.buildingcorner,hydrant,gatecover,manholecover,catchbasin,hydrant,propertybound).
SECTION3–WATERMAINASBUILT
3.1As-BuiltDrawings–WaterInfrastructure
As-BuiltDrawingsshallbeinaccordancewiththestandardsestablishedbyLWDandshallshowcompletedetailsoftheinstallationoftheMainandappurtenancesasrequired,including,butnot
limitedto,
1)ThelocationoftheMainwithrespecttopropertylines,
2)Thesize,make,andlocationwithrespecttostreetcornersofallvalvesandfirehydrants,manholes,andcleanouts,
3)Thelimitsandlocationofanyandallspecialencasementsorbackfillmaterialsincludingaveragedepthofcoveratsuchlocation,
4)Adetaileddiagramofallspecialinstallationsatutility,drainage,androadwaycrossings,
5)Locationofotherutilitiesencountered.
6)Flowlineandrimelevationforallmanholes.
7)Sizeandmaterialofmain,
8)Locationandsizeofeasements.
TheApplicantshallprovidetheWaterDepartmentwithafullsize,reduced,anddigitalcopyofthe
finalsetofAs-builtplanspriortowaterserviceacceptance.
3.1.1Thedigitalcopyofapprovedas-builtplansmustfollowthefiverequirementslistedbelow:
1.Allplansandspecificationsmustbesubmittedonelectronicmedia(CDorDVD_ROMusinganIBM-PCorcompatiblefileformat).Acceptablefileformatsinclude:AutoCAD*.dwg,AutoCAD*.dxf,ArcView*.shp,orArcGISGeodatabase*.mdb.Thefilesmustbe
identicaltotheprintedplanandcontainallinformationincludedonthewrittenplan.
2.AlldigitalmappingdatamustbedeliveredintheMassachusettsStatePlaneCoordinatesystemwithahorizontaldatumofNAD83andverticaldatumofNGVD88.
3.EachfeaturetypemustbeorganizedintheCADorGISdatastructureasaseparate
layerusinglogicallayernames.Forexample,theremustbeseparateCADlayersforbuildings,roads,parcellines,andwetlands.HavingallthesefeaturesinasingleCADlayerorGISfilewillnotbeaccepted.
4.DocumentationofthedataformatmustbeprovidedwithadescriptionoftheCAD
layersandlistofthetypesoffeaturesplacedineachlayer.Submissionofmultiplefilesmustalsoincludealistofthefilesandtheirpurpose.
5.Thedatasubmittedmustincludedocumentationonthemethodusedtogatherthedata,thenameoftheperson(s)responsibleforpreparingthedata,contactinformation,
anestimationofthehorizontalandverticalaccuracy,andthedateofdatacapture.Allmediashallbefreefromanyandalldefectsandviruses,andlabeledastotheircontents.