MATERIALANDINSTALLATIONSPECIFICATIONS
FORCONSTRUCTINGWATERMAINS
ANDSERVICESMATERIALS
______________________________________________________________________________
MATERIALS
1–DESCRIPTION
1.1General:
Thispartofthespecificationsshallgovernforallmaterialsusedintheconstructionofwaterdistribution
facilitiesunderthejurisdictionoftheLittletonWaterDepartment.Projectsthatwouldnecessarily
involvematerialsotherthanthoseincludedinthisspecificationshallbesubjecttotheapprovalofthe
WaterDepartmentSuperintendent.Completespecificationscoveringallmaterialsnotincludedherein
shallbesubmittedforapproval.Anymaterialusedotherthanmaterialshereinspecifiedshallbeofthe
kindandtypenormallyusedintheconstructionofwaterdistributionfacilities.
1.1.1Allproductsincludedinthissectionshallconformtotherequirementsofthestandard
specificationsreferencedherein.
1.2ReferenceStandards:
A.ANSIA21.4/AWWAC104–CementMortarLiningForDuctileIronPipeandGrayIronPipeandFittings
forWater.
B.ANSIA21.10/AWWAC110–GrayIronandDuctileIronFittings,3”through48”,forWaterandOther
Liquids.
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-Onlypipematerialslistedinthissectionshallbeusedformainextensionsunless
specificallyauthorizedinwritingbytheSuperintendent.
2.2DuctileIronPressurePipes:
2.2.1DuctileIronPipeshallbedesignedinaccordancewithAWWAC150andANSI
A21.51/AWWAC151,Class52andshallhavepush-onjointswherespecified.Pipeshallbe
doublecement-linedwithsealcoatinsideandoutconformingtoANSIA21.4/AWWAC104.
Push-onjointsandrubbergaskets.
2.2.2ThepipemanufacturershallsupplyLWDwithcertificatesofcompliancewiththese
specificationsandcertificationthateachpieceofductileironpipehasbeentestedatthe
foundrywithBallImpressionTest,RingBendingorotherapprovedtestforductilityupon
request.
2.2.3Ductileironpipemayberejectedforfailuretomeetanyoftherequirementsofthis
specification.
3–SERVICELINES(SeeAttachmentA)
3.1Description:
Theservicelineisthelinefromthemaintotheoutletvalveatthecustomer’smeter.Itshallconsistof
thecorporationstopatthemain,thetubingorpipe,thecurbstopandcurbbox,andameterwith
valvesonboththeinletandoutlet.LWDalsorequiresaPressureReducerbeinstalledpastthemeter,
aswellasforallSillCockstobeequippedwithaHoseBibVacuumBreakerequaltoWatts#8.
3.1.1PolyethyleneServiceline:Tubingforservicesshallbepolyethylenedesignedfor200psi
service.PipeshallbeinaccordancewithAWWAC901standardforPolyethylenePressurePipe,
tubingandfittings.
3.1.2Forservicelineslargerthantwoinchesindiameter,anypipeapprovedinsectionforwater
mainsshallbeused.
3.3.3Rejection:PBtubingmayberejectedforfailuretomeetanyoftherequirementsofthis
specification.
4–FITTINGS
4.1Description:
Allfittingsusedintheconstructionofwaterlinesshallbe“UnderwritersLaboratory”(UL)forapproved.
AllmaterialslistedinthissectionshallbemanufacturedinNORTHAMERICA.,unlessspecifically
authorizedinwritingbytheSuperintendent.
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-coatedinsideandoutinaccordancewithANSI
A21.4/AWWAC104.Teesforhydrantbranchesandforstubsforfutureuseshallhave
mechanicaljointsontherunwithaplain-endhavinganintegralrotatingglandonthebranch
(Anchor-tees).Theglandwillanchormechanicaljointpipeorvalveendstotheplainendofthe
pipe.
4.2.2AllDuctileandCastIronPipeandfittingsshallbeclean,sound,andwithoutdefects.The
castingsshallbesmoothandfreefrompinholes,excessiron,etc.Thecoatingsshallbe
continuous,smoothandneitherbrittlenorsticky.
4.3BrassWaterServiceFittings/ServiceBoxes:
4.3.1General-StopsandFittingsfurnishedunderthesespecificationsshallbeofthesizeand
typespecified,withallpartsofbrass,conformingtoAlloyNumber4A(ASTMDesignationB62)
whichhasanominalcompositionof85%copperand5%eachoftin,lead,andzinc,plusor
minus1%.Allstops,cocks,andfittingsshallbefullsizeopenings,throughout,ofthesize
specified.
Allcastingsshallbesmooth,freefromburrs,scales,blisters,sandholes,anddefectsofevery
naturethatwouldmakethemunfitfortheuseforwhichtheyareintended.
Nutsshallbesmoothcast,withsymmetrical,hexagonalwrenchflats.
4.3.2CorporationsshallbeAWWAcorporationvalveinletthreadbycompressionfitting,
meetingtherequirementsofANSI/AWWAC800-89,Mueller25008orequivalent.Theyshallbe
designedtorotateabouttheaxisoftheflowpassagewaywithinacircleofrotationsmall
enoughtoproperlycleartheinsideofanystandardtappingmachineofappropriatesize.
4.3.3CurbStopsshallbecompressionfittingmeetingtherequirementsonANSI/AWWAC80089.Mueller25209orequivalent.
4.3.4ServiceBoxesshallbeErieBoxPlugStylewith36”StainlessSteelRodwithstandard4.5–
5.5feetboxeswithastandardplugcoverwithbrasspentagonplug.Eachboxwillbefittedwith
a36’serviceroadandtheboxshallbemanufacturedinU.S.A.
SECTION5–WATERMAINVALVES
5.1ResilientSeatedGateValves:
5.1.1ValvesshallbeResilientWedgeGateValve,WATEROUSSeries500orequivalent
meetingAWWAC509ofthelatestrevision.Allboltsshallbestainlesssteel.Valvesshallhave
anunobstructedwaterwaywhenfullyopenedequalindiametertoatleast¼”greaterthanthe
nominalvalvesizes.Valvesshallhavemechanicaljointend.Valvesusedinconjunctionwith
RomacTappingSleevesshallhaveaflangeend.
5.1.2Allinternalsurfacesshallbecoatedwithepoxytoaminimumthicknessof4mils.Said
coatingshallbenon-toxic,impartnotastetowaterandshallconformtoAWWAC550oflatest
revision.
5.1.3ValvesshallbeprovidedwithtwoO-ringstemseals.BothO-ringsshallbelocatedabove
thethrustcollar.Thesealingmechanismshallprovideadualsealwithzeroleakageatthewater
workingpressurewheninstalledwiththelineflowineitherdirection,andshallconsistofa
ductileirongatehavingavulcanizedsyntheticrubbercoatingwithnorubbermetalseamsor
edgesinthewaterwaywheninthefullyclosedposition.
5.1.4AllvalvesshallbeseattestedattheratedworkingpressureinaccordancewithSection6
ofAWWAC-509.Valveshallberatedat200psiworkingpressureand400psitestpressure.
5.1.5ValvesshallOPENLEFT.
5.2TappingSleeveandValve:
5.2.1TappingsleeveshallbeRomacStainlessSteelorequivalent,meetingAWWAC223.
5.2.2Themechanicaljointsleeveshallhavelongitudinalcompoundrubbergasketswhichshall
fitagainsttherubberendgasketsthusaffectingatotallyenclosedrubberwater-tightseal.
5.2.3Tappingsleeveshallhaveaflangewith“O”ringsealanddrilledtocorrespondtothatof
thetappingsleevetoinsureproperalignment.
5.3ValveBoxes:
5.3.1Valveboxesshallbestandardcast-iron,asphaltcoated,adjustable,slidingtype,together
withcast-ironcoverswiththeword“Water”plainlycastinreliefonthetopsurface.All
ValveBoxesshallbemanufacturedinNorthAmerica.
5.3.2ThebottomsectionshallhaveaminimumI.D.of5-¼”.Thetopsectionshallhavea
minimumdiameterof6-⅛”.Thereshallbeaminimum6”overlapbetweensections.
5.3.3Thebottomsectionshallbe36”inlengthforallgatevalves.Thetopsectionshallbeat
least26”inlengthandhaveaplainbottom.Nothreepiececombinationsshallbeacceptable.
5.4.5Valveboxesshallbecompletelyandthoroughlycoatedwithbitumasticpaint.
6–FIREHYDRANTS
6.1General:
6.1.1Hydrants–TheLittletonWaterDepthasstandardizedontheWaterusWB-67orClow
Medallion.AllHydrantswillbe“OPENLEFT”.Hydrantsshallconformtotherequirementsof
AWWAC-502,andbedesignedfor150psiworkingpressuretestedto300psihydrostatic
6.1.2Hydrantsshallbeabletoberotated360degrees.Theyshallhaveapositiveclosing,selfcleaningdrainvalveanddrainageareashallbecompletelybronzeorbrasslined.
6.1.3HydrantsshallbepaintedyellowtomatchtheTown’sstandardcolor.Inaddition,two
columnswillbeinstalledtoprotecthydrantsfromvehiculartrafficandsnowplows.Columns
shallbepaintedyellowtomatchhydrants.
6.1.4HydrantExtension–MUSTBEapprovedbyLWD,andshallbeprovidedbythesame
manufacturerashydrants.Extensionshallincludebarrel,rod,coupling,bolts,gaskets,andall
otheraccessoryequipmentforacompleteinstallation.
SECTION7–METERS
7.1Description:
Thissectioncoverswatermeters⅝inchto2inches.Aspecialdetailwillbesubmittedforapprovalfor
meterslargerthantwoinches.
7.2MetersmustconformtoAWWAStandardC-700,latestedition.
7.3AsofSeptember1,2003,LWDwillcharge$300.00fora¾”and$360.00fora1”metersetupfor
newinstallations.Theownershallprovideashut-offvalveadjacenttoandonthehousesideofthe
meter.Watermustbeshutofffromthemeterincoldweatherorthemeterotherwiseprotectedfrom
frost.Anypersonallowingtheirmetertobedamagedbyfrostorotherwisewillbeheldresponsiblefor
thecostofmakinggoodthesame.Formetersizesoneandone-halfinch(1½”)orgreater,itisthe
responsibilityoftheowner/customertosupplysaidmeterandshut-off,inaccordancewithLWD
Specifications.Allmeterslargerthan1”shallbeapprovedbyLWD.
7.4.LWDrequiresapressurereduceronthehousesideofthemeterbeinstalledbyalicensed
plumberpriortofinalsignoff.
8–THRUSTBLOCKS
8.1Blocks–ThrustblocksshallbeSolidPrecastConcreteBlockplacedbetweenbackoffittingand
trenchwall,inamannertopreventblowoffofthefitting.
8.2Rodding–Inareaswherethrustblocksareunabletobeusedtoproperlyrestrainthefittings,
threadedrodsshallbeusedtoanchortheconnectiontothemain.
SECTION9–PIPEBEDDINGANDBACKFILL
9.1Bedding:
9.1.1Beddingsandshallbeusedforductileorplasticpipe.Sandshallbefreeofstones.A
minimum8”–12”ofbeddingsandshallbelaidbeneaththepipe,andextend18”overthepipe.
Beddingsandshallbeextendtothewidthofthetrench.
9.2Backfill:
9.2.1Backfillingshallbedonewithgoodearth,sandorgravelandshallbefreefromlargerocks
orhardlumpymaterial,unlesstherocksorlumpsarenotmorethanapproximatelyfour(4)
inchesingreatestdiameterandarescatteredinthesoil.Nomaterialofaperishable,spongy,or
otherwiseunsuitablenatureshallbeusedinbackfilling.
SECTION10–METERBOXES
10.1MeterBoxesfor⅝Inchand1InchMeters:
Meterboxesfor⅝inchthru1”inchmetersshallbeasdepictedbelow.Dimensionsofmeter
boxandlidareintheStandarddetails.
Meterboxlidsshallbecastironasperstandarddetails.SEEBELOW
10.2MeterBoxesforMetersLargerthan1Inch:
MeterboxesshallbeQualityWaterProduct1.5”–2”MeterPitorequal.
10.3MeterBoxesforMetersLargerthan2Inch:
Meterboxesshallbemadeofconcreteblocks,bricksorpouredconcretefourinchesthickor
greater.Concreteshallbe3000lb.minimumat28days.
Coversforthesemeterboxesshallbemadeofsteelasperdesignandplans.Thesteelshallbe
strongenoughtohandlethetrafficload(ifany).
Thewallsofthemeterboxesshallbecoatedwithabituminoussealantinsideandoutside.The
steellidsshallbebituminouscoatedtopreventrust.Lidsshallbeasperspecialstandarddetails.
SECTION11–TRACEWIRE
11.1Tracewireshallbelaidwithallnon-metallicpipeasperstandarddetails.
Traceshallbefourteen(14)gaugesinglestrandplasticcoatedcoppertracewire.
CONSTRUCTIONOFWATERMAINS
SECTION1–GENERAL
1.1Thispartofthespecificationshallgoverntheconstructionproceduresusedintheinstallationof
waterlinefacilitiesunderthejurisdictionoftheLittletonWaterDept.Constructionproceduresother
thanthoseoutlinedinthisspecificationshallmeetwiththeapprovaloftheUtility.Complete
specificationscoveringanyunusualorspecialconstructionprocedureshallbesubmittedforapproval
andapprovalmustbereceivedpriortobeginninganyconstructionoperations.
SECTION2–EXCAVATIONANDBACKFILL
2.1Description:
Thissectioncoverstheexcavationandbackfillofwaterlines,andappurtenances.
2.2TrenchExcavation:
2.2.1Thesidesoftheexcavationshallbecutassuchaslopethatwillpreventcaving.Inareas
wheresoilconditionspermitnormalexcavationofthetrench,thesidesshallbecutasnearly
verticalaspossiblefromthebottomofthetrenchtoapoint12”abovethetopofthepipewhen
itislaidtograde.Maximumandminimumwidthsofthetrenchshallbeasshownintheplans.
2.2.2Incavinggroundorinwet,saturated,orflowingmaterials,thesidesoftheexcavationshall
beadequatelysheetedandbracedsoastomaintaintheexcavationfreefromslidesorcave-ins
andsafeforworkmen.Sheetingandshoringshallnotberemoveduntiltheexcavationhasbeen
backfilledtoasufficientdepthtopreventcaving.
2.3TrenchBottom:
TheentirelengthofthewaterlineshallbefoundedonbeddingspecifiedinPipeBeddingand
BackfillMaterials.
2.4DisposalofExcavatedMaterials:
Excavatedmaterialshallbepiledadjacenttotheworktobeusedforbackfillingasrequired.Excavated
materialswhichareunsuitableforbackfillingandexcessmaterialshallbedisposedlegallydisposedofat
contractor’sexpense.
2.5UseofExplosives:
Intheeventtheuseofexplosivesisnecessaryfortheefficientprosecutionofthework,theContractor
shallnotifytheSuperintendentinadvanceoftheiruseandshallexerciseeveryprecautiontoprevent
damagetoadjoiningimprovementsorpropertybyreasonoftheiruse.Anydamagetoprivateproperty
resultingfromtheuseofexplosivesshallbetheliabilityoftheContractor.Inallcaseswherethe
explosivesarenecessary,apermitfromthelocalgovernmentagencyshallbeobtainedpriortotheir
use.
2.6Backfilling:
2.6.1WaterLines:
2.6.1.1Backfillingofwaterlinesshallincludetherefillingandconsolidationofthefillin
theexcavationuptothesurroundinggroundsurfaceorroadgradeatcrossings.Itis
essentialthatthecompletebackfillbedoneinsuchamannertominimizevoidsinthe
backfill.
2.6.1.2Backfillinguptothepoint12”abovethetopofthepipeshallbedonewithgood
earth,sand,orgravelandshallbefreefromlargerocksorhard,lumpymaterials.No
materialsofperishable,spongyorotherwiseunsuitablenatureshallbeusedin
backfilling.
2.6.1.3BackfillofPipe:
Rigidpipe(concrete,castiron,orasbestoscement)shallbebackfilledwithselect
materialsofthepropermoisturecontenttoobtainasupportunderthelower½ofthe
pipe,compactedtoadensityof90%AASHTOT-180modifiedorbetter.Theintentisto
cradlethepipesothatthefilllengthofeachjointisuniformlysupportedonfirm
beddingandtheweightofpipeandfillisborneuniformlybythelower½ofthepipe
barrel.Tampingoffillbelowthespringlineofthepipemaybebyhandtampsprovided
therequireddensityisobtained.
Wheretrenchesarenotunderexistingorproposedpavedareas,backfillshallproceed
withthesameselectmaterialshandplacedtoapoint12”overthetopofthepipe.
Backfillmaythenproceedbywhatevercommonlyusedconstructionmethodsasare
consistentwiththeintegrityofthepipeline.Backfilloutsidetheexistingorproposed
pavedareasshallbeleftslightlyoverfulltoallowforsettlement.
Wheretrenchesareunderexistingorproposedpaveareas,theentiretrenchuptoa
point2’belowexistingorproposedsubgradeshallbebackfilledwithselectmaterials
andcompactedtoadensityof90%AASHTOT-180modifiedorbetter.Theremaining2’
shallbesimilarlybackfilled,buttheminimumcompactionshallbe95%AASHTOT-180
modified.
Thebackfillofmaterialsintrenchesunderexistingorproposedpavedareasshallbe
compactedwithmechanicaldevicesmanufacturedforthatpurposeformtwofeet
abovethetopofthepipetothetopoftheexistingorproposedsubgrade
SECTION3–DEWATERINGOFTRENCHES
3.1Description:
Thissectioncoversthedewateringoftrenchestotheextentthatbeddingmaterialandwaterpipecan
beplacedondry,firmtrenchbottom.
3.2Wellpointing:
Wellpointingwhererequiredtokeeptheexcavationdryandthesubgradestable,shallbeinstalledwhen
theexcavationiswithinaminimumoftwo(2)feetofthewatertable,exceptashereinafterprovided,
andshallbeincontinuousoperationuntilbackfilliscompletedtothislevel.Whenconstruction
equipmentistobeoperatedinanareathathasbeenexcavatedandwellpointingisrequiredtokeep
trenchexcavationdryandthesubgradestable,thewellpointshallbeinstalledwhentheexcavationis
withinaminimumoffive(5)feetofthewatertable.Thereshallbesufficientpumpingequipment,in
goodworkingorder,availableatalltimes,toremoveanywaterthataccumulateswhenthepipeline
crossesnaturaldrainagechannels,theworkshallbeconductedinsuchamannerthatunnecessary
damageordelaysintheprosecutionoftheworkshallbeprevented.Provisionshallbemadeforthe
satisfactorydisposalofsurfacewaterpumpedsoastopreventdamagetopublicorprivateproperty.
3.3TrenchDewatering:
Dewateringoftrenchesotherthanbywellpointingshallbeaccomplishedbywhatevermeanselectedby
theContractor,however,beddingmaterialorpipemaynotbeplacedinwetorunstabletrenches.Soil
thatcannotbeproperlydewateredshallbeexcavatedanddrymaterialtampedinplacetosuchadepth
asmayberequiredtoprovideafirmtrenchbottom.
3.4SurfaceRunoff:
Surfacerunoffwatershallbedivertedawayfromthetrenches.Suchdiversionshallbeintoexisting
drainagestructuressuchasstormsewers,ditchesorstreams.Diversionofsurfacerunoffshallbeinsuch
amannertopreventfloodingofstreetsorprivateproperty.
3.5DispositionofWaterfromDewatering:
Allwaterremovedfromthetrenchesbywellpointingoranyothermeansshallbepumped,pipedor
drainedintoexistingdrainagestructures,suchasstormsewers,ditchesorstreams.Thedispositionof
waterfromdewateringoperationsshallbeaccomplishedinamannerthatwillpreventthefloodingof
publicorprivateproperty.
SECTION4–SHEETINGANDSHORING
4.1Description:
Thissectioncoversthesheetingandshoringtoprotectthesafetyofworkers,providesuitablemeansfor
constructingthewaterline,andtoprotectpublicorprivateproperty,includingexistingutilities.
4.2Cave-ins:
Wheretrenchcave-insareapossibility,adequatesheetingand/orshoringshallbeprovidedsoasto
maintainthetrenchfreefromslidesorcave-insandsafeforworkmen.
4.3ExistingStructures:
Whereexistingbuildings,otherutilities,streets,orotherstructuresareincloseproximitytothetrench,
adequateprotectionshallbeprovidedbytheuseofsheetingandshoringtoprotectthestructurefrom
possibledamage.
Inthecaseofstreetsorutilities,theContractormayelecttoremovethestreetorutilityprovidedthat
theremovalandsubsequentreplacementmeetswiththeapprovaloftheTownofLittleton,theutility
owner,orwhoeverhasjurisdictionofthestructure.Inallcases,itshallbetheresponsibilityofthe
Contractortoprotectpublicandprivatepropertyandanypersonorpersonwhomight,asaresultofthe
Contractor’swork,beinjured.
SECTION5–PIPELAYING
5.1Description:Thissectioncoversthelayingofpipeforwaterlines.
Eachjointofpipeshallbeinspectedcarefullybeforebeingplacedinthetrench.Anyjointfoundtobe
crackedorotherwisesodamagedastoimpairitsusefulnessshallbeplainlymarkedinsuchamanner
thatthemarkingswillnotruborwashoff.Damagedjointsshallberemovedfromthesiteassoonas
feasible.
5.2PipeLaying:
5.2.1Allpipeandfittingsshallbeinstalledtothelineandgradeasdetailedontheplans.Subject
totheapprovaloftheEngineer,otherfittingsmaybeaddedtoorsubstitutedforthoseshown
ontheplans,shouldtheneedariseduringconstruction.Thispermissivestipulationinnoway
shallrelievetheContractoroftheresponsibilityforfurnishingandinstallingallfittingsrequired
foracompleteandproperinstallationofmainasdetailedontheplans.
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Properfacilitiesshallbeprovidedforloweringsectionsofpipeintotrenches.Underno
circumstancesshallpipebelaidinwaterandnopipeshallbelaidwhentrench
conditionsorweatherareunsuitableforsuchwork.Fullresponsibilityforthediversion
ofdrainageandfordewateringoftrenchesduringconstructionshallbebornebythe
Contractor.
Alldirtandotherforeignmattershallberemovedfromtheinsideofpipeandfittings
beforetheyareloweredintothetrench.Theyshallbekeptcleanduringandafter
laying,careshallbetakentokeepdirtoutofthejointingspace.
Spigotandbellsshallbecleanedthoroughlybeforetheapplicationoflubricantand
attachmentofthegasketshallbeinstrictaccordwiththejoint.
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Allfittingsshallbetightenedusingtorquewrenchestothemanufacturer’s
specifications.
Attheendofeachday’swork,andwhenpipelayingisdiscontinuedforanappreciable
period,openendsofpipeshallbeclosedwithacastplugorcapfirmlysecuredinplace.
Allpipeandfittingsshallbeloweredcarefullyintothetrenchinsuchmannerasto
preventdamagetopipe,fittings,orlinings.Neitherpipenorfittingsshallbedroppedor
dumpedintothetrench.
Cuttingofpipe,whereneeded,shallbedoneinaneatandworkmanlikemanner
withoutdamagetopipeorpipelining.
Deflectionsshallnotexceedthemaximumrecommendedbythepipemanufacturer.
Allnon-metallicpipesshallhavetracewiremeetingrequirementsofSectionMW12,
“TraceWire”ofthesespecificationsasperstandarddetails.
Backfillingshallnotbeundertakenuntilwatermaininstallationhasbeeninspectedand
approvedbyLWD.
5.3EarlyWarningTape:
Earlywarningtapeorwireshallbeinstalledintrenchontopofpipebeddingsand.
SECTION6–TAPS
6.1ServiceTaps:
6.1.1General:
Taps:Tapsfortransmissionofwaterorairfromthemainintosystemserviceaccessoriesare
definedasfollows:
a.Standardinternalpipethreadedholesinthewallofwatermains;thesetapsmaybeeither
manufacturedintothepipeorinstalledinthefield.
b.Tapinstallationsthataremadebyclampingabronzeserviceclampequippedwithasealed
threadedportontheperipheryofthemainthendrillingthroughthepipewalltocompleteeach
serviceport.
c.Whenadirecttapismade,pipedopeorTeflontapeshallbeappliedtothethreadedpartof
thecorporationstop.
d.Serviceswillonlybeprovidedfromdedicatedeasements,alleyadright-of-ways.
e.Tapswillbelocatedinsuchamannertoprovidetheshortestdistanceandmostdirectlineto
themeter.
f.Effortshouldbemadetoallowforthecorporationtobesetateither10o’clockor2o’clock.
6.1.2TappingAsbestos-CementPipe:
Asbestos-cementpipeshallbetappedbytheuseofatappingsaddlewithdoublestainlesssteel
straps.
6.1.3TappingCastIronPipe:
Castironpipefour(4)inchesindiameterandsmallershallbetappedbytheuseofatapping
saddlemadeofbronzeorstainless
6.1.4TappingDuctileIronPipe:
DuctileIronPipeshallbetappedthesameascastironpipe,SectionCW8.1.3above.
6.1.5TappingPVCPipe:
PVCpipeshallbetappedthesameascastironpipe,SectionCW8.1.3above.
6.1.6TappingConcretePressurePipe:
Concretepressurepipeshallbetappedbytheuseofabronzeorstainlesssteeltappingsaddle
asinCW8.1.1.babove.TapshallbemadeaccordingtoPipeManufacturer’sspecifications.After
tapismade,tapshallbecoveredwithmortarconformingtoMW13.1“Mortar”ofthese
specifications.
6.2MainTaps:
6.2.1WetTaps:
WetconnectionsshallbeusedforallconnectionsexceptwheredirectedbytheEngineer.Wet
connectionsshallbemadewithatappingsleeveandvalveconformingtoMW5.3“Tapping
ValvesandSleeves”ofthesespecifications.Eitherairdrivenormanualtappingmachinesmayb
used.Thepipetobetappedshallbecleanedthoroughlyandwirebrushedtoremoverustand
otherforeignmatter.Thetappingsleeveshallbeputonandtighteneddownsecurely.Thevalve
shallbeputonthesleeveandbracedagainstmovement.Thenthetapshallbemade.
6.2.2DryTaps:
DryconnectionsshallonlybemadewhendirectedbytheEngineerand/orwhenafittingmust
beaddedtoanexistingline.Fordryconnections,theexistinglinemustbeshutoffanddrained.
Thisshouldbedonesothatdowntimeofthelineshallbeasshortaspossible.Afterlinehas
beendrained,thelineshallbecutandthefittingputinandblocked.Thesectionolinecutinto
shallbetestedandsterilizedaswouldanewline.
SECTION7–HYDRANTS
7.1Description:
Thissectioncoversconstructionmethodsusedinsettingfirehydrants.Allfirehydrantsshallconformto
SectionMW6–“FireHydrants”.
7.2Excavation:
Excavationforfirehydrantsshallbeneatandshallleavebackoftrenchandbottomoftrench
undisturbedearthforconcreteblocking.
7.3Installation:
Firehydrantsshallbeinstalledasperstandarddetails.Astandardsix-inchgatevalveshallbebetween
themainandhydrant,asperstandarddetails.Six(6)inchDuctileironwaterline,meetingrequirements
MW2.2–“DuctileIronPressurePipe”ofthesespecifications,orSwivaladaptersshallbeusedtoinstall
firehydrants.
7.4Backfill:
Backfillshallbeasperstandarddetails.Concretelockingshallbeputunderneathandbehindhydrant.At
leastseven(7)cubicfeetofcrushedstone,average¾inchdiameter,shallbeplacedaroundhydrantas
perstandarddetailsfordrainageofhydrantbarrel.Fabricshallbeplacedabovestonetoprovidea
separationbarrierbetweenbackfillandstone.
SECTION8–PAVEMENTREPAIRS
8.1Description:
Thissectioncoverstheconstructionmethodstobeusedintherepairofroads,streets,orotherpublic
rights-of-way.
8.2PermanentRepairs:
8.2.1Asphaltconcretehotmixsurfacecourseconstructionshallmeetwiththecurrent
requirementsoftheLittletonHighwayDepartmentSpecificationsortheMassDOT
Specificationsfortheconstructionofasphaltconcretehotmixsurfacecourseorasotherwise
approved.
8.2.2ConcretepavementrepairsshallmeetwiththecurrentrequirementsoftheMassDOT
SpecificationsortheLittletonHighwayDepartmentSpecificationsfortheconstructionof
concreterigidpavements.
8.2.3GravelsurfacingshallmeetwiththecurrentrequirementsoftheLittletonHighway
Department
8.2.4Allpermanentrepairsofstreets,roads,orotherpublicrights-of-wayshallmeetwiththe
constructionrequirementsofthegoverningagencyorprivateownerandshallmeetwiththe
requirementsofalllocalOrdinances,Regulations,Permits,orCodesgoverningtherepairsto
roads,streets,orotherrights-of-way.
8.3TemporarySurfacing:
MethodsoftemporarysurfacingshallmeetwiththerequirementsofParagraph14.2orasotherwise
approvedtoadequatelymaintaintrafficandproperdrainage.
SECTION9–CONSTRUCTIONWITHINCITYRIGHT-OF-WAY
9.1CityStreets:
LittletonHighwayDepartmentandMassDOT(whenapplicable)shallbenotifiedpriortoanystreetcuts.
Properpermittingshallbeobtainedpriortoopeningofanycitystreets
Ifcitystreetshavetobeclosed,theLittletonFire,PoliceandHighwaydepartmentshallbenotifiedof
closing.Properbarricades,warningsigns,lightsandwatchmenshallbeemployed.Workshallbe
prosecutedinsuchamannerthatone-halfofthetraveledportionoftheroadisopentotrafficunless
approvedbyLittletonPoliceDept.inwriting.
Right-of-wayshallbeleftinaneatandorderlymannerandleftinasgoodorbettershapethanitwas
beforeconstruction.
9.2Easements:
Easementsshallbeleftinaneatandorderlymanner.Easementsshallbeleftinasgoodorbettershape
thanthatbeforeconstruction.
SECTION10–EXISTINGSTRUCTURES
10.1General:
NotreesorexistingstructuresshallberemovedunlessapprovedbytheSuperintendent.Allexisting
structures,improvements,andutilitiesshallbeadequatelyprotected,attheexpenseoftheContractor,
fromdamagethatmightotherwiseoccurduetoconstructionoperations.TheContractorshallbeliable
fordamagetoanyutilitiesresultingfromhisoperation.Duringconstruction,allfirehydrants,valve
boxes,fireorpolicecallboxes,andotherexistingutilitycontrolsshallbeleftintact,unobstructedand
accessible.
SECTION11–STERILIZATION
11.1Description:
Thissectioncoversmethodsforsterilizationofwaterlinesandfacilities.Beforewaterlinesaresterilized
theymustfirstbepressuretestedaccordingtotherequirementsofPartTW–“TestingofWaterMains”
ofthesespecifications.Waterlinesalsomustbeflushedtoremovedirtandotherforeignmatter.
11.2Flushing:
Aservicetapmustbeputononeendofthewaterlinetoallowentryofflushingwaterandsterilization
water.ThetapshallbedoneaccordingtotherequirementsofCW8–“ServiceTaps”ofthese
specifications.
FlushingshallbedonewithcleanwaterfromtheTown’ssystemuntilwaterleavingtheotherendofthe
mainisclear.
11.3Sterilization:
Chlorineshallbeusedtosterilizethepipelinebythefollowingmethod:
Theamountofchlorineappliedshallbesuchastoprovideadosageofnotlessthanfifty(50)partsper
million.Thechlorinatingmaterialshallbeintroducedtothewaterlinesanddistributionsystemina
mannerapprovedbytheEngineer.Afteracontactperiodofnotlessthaneight(8)hours,thesystem
shallbeflushedwithcleanwateruntiltheresidualchlorinecontentisnotgreaterthan0.2partsper
million.Allvalvesinthelinesbeingsterilizedshallbeopenedandclosedseveraltimesduringthe
contactperiod.
Thecostoffurnishingthechlorine,labor,tools,equipment,andtestsofchlorinecontentand
bacteriologicaltestswillbeattheexpenseoftheContractor.Nowatermainsshallbeplacedinservice
untilasatisfactorytestreporthasbeenreceivedfromanapprovedlaboratory.
TESTINGOFWATERMAINSECTION
SECTION1–GENERAL
1.1Thispartofthespecificationsstipulatestestrequirementsformaterials,constructionmethods,and
leakage,pressureandbacteriologicaltestsofthewaterlines.Testingformaterialsandconstruction
methodsshallbeattheDeveloper’soptionexceptasstipulatedherein.TheLittletonWaterDepartment
mayrequiretestsasoutlinedinthesespecificationsformaterialsandconstructionproceduresif,inthe
opinionoftheWaterDepartment,thequalityofmaterialsandtheconstructionproceduresdonotmeet
therequirementsstipulatedherein.
Inallcases,leakage,pressureandbacteriologicaltestsshallbeperformedonwaterlinesasspecifiedin
thesestandardspecifications.
SECTION2–HYDROSTATICTESTING
2.1DuctileIronPipe:
Assoonasacontinuoussectionofnewwatermainhasbeeninstalled,theContractorshallproceed
immediatelytocompletealltestingandsterilizing,makeallconnections,andplacethosesectionsin
service.TheContractorshallfurnishalllabor,materials,tools,andequipmentnecessarytobulkhead
andsealoffthelinefortesting,coordinatewiththeLittletonWaterDept.toflush&fillthenewly
constructedmainwithwater.
Unlessotherwiseindicated,thepipelineshallbetestedwithahydrostaticpressureofnotlessthantwo
hundred(200)poundspersquareinchmaintainedoveracontinuousperiodofnotlessthantwo(2)
hoursbyanindependentthirdpartycontractorwhoperformswatermainpressuretestingonaregular
basis.Afterasuccessfulcontinuouspressureperiodoftwo(2)hourshasbeencompleted,the
contractorshallchlorinate(seesection11–Sterlilization)thewatermainusingathirdpartycontractor.
Thecostoftesting,finding,andrepairingtheleaksandretesting,shallbeattheexpenseofthe
Contractor.ThewaterrequiredtofillthelineswillbefurnishedbytheOwner,withoutchargetothe
Contractor.
2.2PVCPressurePipe:
Assoonasacontinuoussectionofnewwatermainhasbeeninstalled,theContractorshallproceed
immediatelytocompletealltestingandsterilizing,makeallconnections,andplacethosesectionsin
service.TheContractorshallfurnishalllabor,materials,tools,andequipmentnecessarytobulkhead
andsealoffthelinefortesting,fillitwithwater,raisethefilledlinetotestpressure,andmeasurethe
amountofleakageoverthetestperiod.Unlessotherwiseindicated,thepipelineshallbetestedwitha
hydrostaticpressureofnotlessthanthatpressurethepipeisratedat(i.e.,class200testpressure200
psi)maintainedoveracontinuousperiodofnotlessthanfour(4)hours.Afterasuccessfulcontinuous
pressureperiodoffour(4)hourshasbeencompleted,atestforthedeterminationofamountofleakage
shallberunatthesamepressureasbeforeforadurationoftwo(2)hours.Ifthetestsindicatealeakage
inexcessofarateequaltoten(10)gallonsperinchofinternalpipediameterpermileofpipelineper
twenty-four(24)hours,theContractorwillberequiredtofindandeliminatetheleak.Allknownleaks
shallbestopped,regardlessofthetestrequirement.
Thecostoftesting,findingandrepairingtheleaksandretesting,shallbeattheexpenseofthe
Contractor.ThewaterrequiredtofillthelineswillbefurnishedbytheOwner,withoutchargetothe
Contractor.
SECTION3–BACTERIOLOGICALTEST
3.1AfterasectionofwatermainhasbeensterilizedandflushedaccordingtoSectionCW19–
“Sterilization”ofthesespecifications,theUtilityshallbenotifiedtopickupasample.Abacteriological
testshallberuntodeterminewhethercoliformorganismsarepresent.Ifcoliformorganismsarefound
thelinewillhavetoberesterilizedasperSection11.3ofthesespecifications.
TheContractorwillbenotifiedastotheresultsofthetest.Thetestrequires48hourstocomplete.
ASBUILTDRAWINGS
SECTION1–GENERAL
1.1ThispartofthespecificationsstipulatestestrequirementsfortheprovisionofASBUILTdrawingsof
worktobeprovidedtotheLittletonWaterDept.AllcostsassociatedwithprovidingaccurateASBUILT
drawingstoLWDshallbetheresponsibilityofthecontractor.
SECTION2–SERVICEASBUILT
2.1Atthecompletionoftheinstallation,andpriortoawatermeterbeinginstalled,thecontractorshall
providetoLittletonWaterDeptanASBUILTdrawingdepictingthefollowing:
•
•
•
CurbStop
WaterLinewithDesignationastothesize.
Locationwheretheserviceentersthebuilding
AllASBUILTDrawingsshallhaveaminimumoftwo(2)tiesfrompermanentstructures(i.e.building
corner,hydrant,gatecover,manholecover,catchbasin,hydrant,propertybound).
SECTION3–WATERMAINASBUILT
3.1As-BuiltDrawings–WaterInfrastructure
As-BuiltDrawingsshallbeinaccordancewiththestandardsestablishedbyLWDandshallshow
completedetailsoftheinstallationoftheMainandappurtenancesasrequired,including,butnot
limitedto,
1)ThelocationoftheMainwithrespecttopropertylines,
2)Thesize,make,andlocationwithrespecttostreetcornersofallvalvesandfirehydrants,
manholes,andcleanouts,
3)Thelimitsandlocationofanyandallspecialencasementsorbackfillmaterialsincluding
averagedepthofcoveratsuchlocation,
4)Adetaileddiagramofallspecialinstallationsatutility,drainage,androadwaycrossings,
5)Locationofotherutilitiesencountered.
6)Flowlineandrimelevationforallmanholes.
7)Sizeandmaterialofmain,
8)Locationandsizeofeasements.
TheApplicantshallprovidetheWaterDepartmentwithafullsize,reduced,anddigitalcopyofthe
finalsetofAs-builtplanspriortowaterserviceacceptance.
3.1.1Thedigitalcopyofapprovedas-builtplansmustfollowthefiverequirementslistedbelow:
1.Allplansandspecificationsmustbesubmittedonelectronicmedia(CDorDVD_ROM
usinganIBM-PCorcompatiblefileformat).Acceptablefileformatsinclude:AutoCAD
*.dwg,AutoCAD*.dxf,ArcView*.shp,orArcGISGeodatabase*.mdb.Thefilesmustbe
identicaltotheprintedplanandcontainallinformationincludedonthewrittenplan.
2.AlldigitalmappingdatamustbedeliveredintheMassachusettsStatePlane
CoordinatesystemwithahorizontaldatumofNAD83andverticaldatumofNGVD88.
3.EachfeaturetypemustbeorganizedintheCADorGISdatastructureasaseparate
layerusinglogicallayernames.Forexample,theremustbeseparateCADlayersfor
buildings,roads,parcellines,andwetlands.HavingallthesefeaturesinasingleCAD
layerorGISfilewillnotbeaccepted.
4.DocumentationofthedataformatmustbeprovidedwithadescriptionoftheCAD
layersandlistofthetypesoffeaturesplacedineachlayer.Submissionofmultiplefiles
mustalsoincludealistofthefilesandtheirpurpose.
5.Thedatasubmittedmustincludedocumentationonthemethodusedtogatherthe
data,thenameoftheperson(s)responsibleforpreparingthedata,contactinformation,
anestimationofthehorizontalandverticalaccuracy,andthedateofdatacapture.All
mediashallbefreefromanyandalldefectsandviruses,andlabeledastotheir
contents.