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Ðremoving€blockage€causing€materials.€€Where€such€openings€are€not€provided€on€theÐ €(" Ðpumps,€a€hand€hole€in€the€first€fitting€connected€to€the€suction€of€each€pump€shall€beÐ Tü# Ðprovided.€€All€pumps€shall€be€securely€supported€so€as€to€prevent€movement€duringÐ ( Ð$ Ðoperation.€€For€submersible€pumps,€rail„type€pump€support€systems€incorporatingÐ ü ¤% Ðmanufacturer€approved€mechanisms€designed€to€allow€the€operator€to€remove€andÐ Ð!x& Ðreplace€any€single€pump€without€first€entering€or€dewatering€the€wet€well€should€beÐ ¤"L ' Ðprovided.Ðx# !($$ Ðà0 U àb)à0U$U$àThe€firm€pumping€capacity€of€all€lift€stations€shall€be€such€that€the€expected€peak€flow€canÐ L$ô!) Ðbe€pumped€to€its€desired€destination.€€Firm€pumping€capacity€is€defined€as€total€stationÐ  %È"* Ðmaximum€pumping€capacity€with€the€largest€pumping€unit€out€of€service.Ðô%œ#+$$ Ðà0 U àc)à0'U$U$àà0'$'$àLift€stations€or€transfer€pumping€facilities€at€a€wastewater€treatment€plan€or€thoseÐ È&p$, Ðdischarging€directly€to€the€treatment€plant€where€the€plantððs€permitted€daily€average€flowÐ œ'D%- Ðis€equal€to€or€greater€than€100,000€gallons€per€day€shall€be€provided€with€three€or€moreÐ p(&. Ðpumps€or€with€duplex€automatically€controlled€variable€capacity€pumps€or€other€automaticÐ D)ì&/ Ðflow€control€devices.€€The€pumps€or€other€devices€shall€be€adjusted€for€actual€flowÐ *À'0 Ðconditions€and€controlled€to€operate€so€as€to€minimize€surges€in€the€treatment€units.€€NoÐ ì*”(1 Ðsingle€pumping€unit€shall€have€a€capacity€greater€than€the€design€peak€flow€of€theÐ À+h)2 Ðwastewater€treatment€plant€unless€flow€splitting/equalization€is€provided.Д,<*3$$ Ðà0 U àd)à0U$U$àThe€engineering€design€report€accompanying€the€plans€shall€include€system€curves,Ð h-+4 Ðpump€curves€and€head€calculations.€€Calculations€and€pump€curves€at€both€minimum€andÐ X Ðmaximum€static€heads€and€for€a€C€value€of€both€100€and€140€must€be€provided€for€eachÐ ,Ô Ðpump€and€for€the€combination€of€pumps€(modification€pump€curves).€€Where€a€suction€liftÐ ¨ Ðis€required,€the€report€shall€include€a€calculation€of€the€available€new€positive€suction€headÐ Ô| Ð(NPSH)€and€a€comparison€of€that€value€to€the€required€NPSH€for€the€pump€as€furnishedÐ ¨P Ðby€the€pump€manufacturer.Ð|$$$ Ðà0 U àe)à0U$U$àOnly€self„priming€or€pumps€with€acceptable€priming€systems,€as€demonstrated€by€aÐ Pø Ðreliable€record€of€satisfactory€operation,€shall€be€used€where€the€suction€head€is€negative.€Ð $Ì ÐAll€self„priming€pumps€shall€include€a€means€for€venting€the€air€back€to€the€wet€well€whenÐ ø  Ðthe€pump€is€priming.ÐÌ t $$ Ðà0 U àf)à0'U$U$àà0'$'$àAll€raw€sewage€pumps,€other€than€submersible€pumps€without€ð ðno€suctionðð€piping€andÐ   H  Ðself„priming€units€capable€of€satisfactory€operation€under€any€negative€suction€headsÐ t   Ðanticipated€for€the€lift€station€under€consideration,€shall€be€positioned€such€that€the€pumpsÐ H ð  Ðalways€experience,€during€their€normal€on„off€cycling,€a€positive€static€suction€head.Ð Ä $$ ÐÌÓ€ P(%¤80KÓÝ"‚>3£"ÝÝ  ÝÝ‚>3£08ÝÔ2%¤ÔÚ  Ú15Ú  Ú.Ô3  Ôà0 U àÝ  ÝPiping݃>3£08]8ÝŒÐÄl U$U$ ÐŒÝ  Ýà0 U àa)à0U$U$àEach€pump€shall€have€a€separate€suction€pipe.€€Cavitation€may€be€avoided€by€usingÐ ˜@  Ðeccentric€reducers€in€lieu€of€typical€reducers€in€order€to€prevent€air€pockets€from€formingÐ l Ðin€the€suction€line.Ð@è$$ Ðà0 U àb)à0U$U$àFull€closing€valves€shall€be€installed€on€the€discharge€piping€of€each€pump€and€on€theÐ ¼ Ðsuction€of€all€dry€pit€pumps.€€A€check€valve€shall€be€installed€on€the€discharge€side€of€eachÐ è Ðpump,€preceding€the€full€closing€valve.€€Check€valves€should€be€of€a€swing€check€typeÐ ¼d Ðwith€external€levers.€€Rubberball€check€valves€may€be€used€for€grinder€pump€installationsÐ 8 Ðin€lieu€of€the€swing€check€type.€€Butterfly€valves,€tilting€disc€check€valves,€or€other€valvesÐ d  Ðwith€a€pivoted€disc€in€the€flow€line€are€not€allowed.€€The€design€shall€consider€surgeÐ 8à Ðeffects€and€provide€protection€where€necessary.€€Surge€relief€shall€be€contained€in€theÐ  ´ Ðsystem.Ðàˆ$$ Ðà0 U àc)à0'U$U$àà0'$'$àGate€valves€should€be€rising„stem€valves.€€If€other€than€rising„stem€gate€valves€and€checkÐ ´\ Ðvalves€with€external€levers€are€used,€the€valves€shall€include€a€position€indicator€to€showÐ ˆ0 Ðtheir€open€and€closed€positions.Ð\$$ Ðà0 U àd)à0U$U$àFlanged€pipe€and€fitting€or€welded€pipe€shall€be€used€for€exposed€piping€inside€of€liftÐ 0Ø Ðstations.€€A€flexible€or€flanged€connection€shall€be€installed€in€the€piping€to€each€pump€soÐ ¬ Ðthat€the€pump€may€be€removed€easily€for€repairs.€€Provisions€shall€be€made€in€the€designР؀  Ðto€permit€flexure€where€pipes€pass€through€walls€of€the€station.€€Piping€should€normallyÐ ¬T! Ðbe€sized€so€that€the€maximum€suction€velocity€does€not€exceed€five€feet€per€second€andÐ €(" Ðthe€maximum€discharge€velocity€does€not€exceed€eight€feet€per€second.ÐTü#$$ Ðà0 U àe)à0U$U$àForce€mains€shall€be€a€minimum€of€four€inches€in€diameter,€unless€justified,€as€with€theÐ ( Ð$ Ðuse€of€grinder€pumps.€€In€no€case€shall€the€velocity€be€less€than€two€feet€per€second€withÐ ü ¤% Ðonly€the€smallest€pump€operating,€unless€special€facilities€are€provided€for€cleaning€theÐ Ð!x& Ðline€at€specified€intervals€or€it€can€be€shown€that€a€flushing€velocity€of€five€feet€per€secondÐ ¤"L ' Ðor€greater€will€occur€one€or€more€times€per€day.€€Pipe€specified€for€force€mains€shall€beÐ x# !( Ðof€a€type€having€an€expected€life€at€least€as€long€as€that€of€the€lift€station€and€shall€beÐ L$ô!) Ðsuitable€for€the€material€being€pumped€and€the€operating€pressures€to€which€it€will€beÐ  %È"* Ðsubjected.€€All€pipe€shall€be€identified€in€the€technical€specifications€with€appropriateÐ ô%œ#+ ÐASTM,€ANSI€or€AWWA€specification€numbers€for€both€quality€control€and€installation.€€AllÐ È&p$, Ðpipe€and€fittings€shall€have€a€minimum€working€pressure€rating€of€150€pounds€per€squareÐ œ'D%- Ðinch.Ðp(&.$$ Ðà0 U àf)à0'U$U$àà0'$'$àFinal€plans€and€specifications€shall€describe€and€require€pressure€testing€for€all€€forceÐ D)ì&/ Ðmains€following€construction.€€Minimum€test€pressure€shall€be€1.5€times€the€maximumÐ *À'0 Ðdesign€pressure.Ðì*”(1$$ Ðà0 U àg)à0U$U$àAir€release€valves€or€combination€air€release/vacuum€valves€suitable€for€sewage€serviceÐ À+h)2 Ðshall€be€provided€at€all€peaks€in€elevation.€€The€final€engineering€drawings€must€depict€allÐ ”,<*3 Ðproposed€force€mains€in€both€plan€and€profile.Ðh-+4$$ ЇÓ€ M(U¤88PÓÝ"‚>3£"ÝÝ  ÝÝ‚>3£ IÝÔ2U¤ÔÚ  Ú16Ú  Ú.Ô3  Ôà0 U àÝ  ÝLift€stations€shall€be€designed€such€that€there€is€not€a€substantial€hazard€of€stream€pollution€fromÐ X Ðoverflow€or€surcharge€onto€public€or€private€property€with€sewage€from€the€lift€station.€€Options€forÐ ,Ô Ða€reliable€power€source€may€include:݃>3£ I8I݌ШU$U$ ÐŒÝ  ÝÌà0 U àa)à0U$U$àThe€commission€will€determine€the€reliability€of€the€existing€commercial€power€service.€Ð ¨P ÐSuch€determinations€shall€be€based€on€power€outage€records€obtained€from€theÐ |$ Ðappropriate€power€company€and€presented€to€the€commission.€€When€requesting€outageÐ Pø Ðrecords€for€submittal€to€the€commission,€it€is€important€to€note€that€the€records€be€inÐ $Ì Ðwriting,€bear€the€signature€of€an€authorized€utility€employee,€identify€the€location€of€theÐ ø  Ðwastewater€facilities€being€served,€list€the€total€recorded€outage.€€The€facility€will€beÐ Ì t  Ðdeemed€reliable€if€the€demonstrated€wastewater€retention€capacity,€in€the€stationððs€wetÐ   H  Ðwell,€spill€retention€facility,€and€incoming€gravity€sewer€lines,€is€sufficient€to€insure€that€noÐ t   Ðdischarge€of€untreated€wastewater€will€occur€for€a€length€of€time€equal€to€the€longestÐ H ð  Ðelectrical€outage€recorded€in€the€past€24€months.Ð Ä $$ ÐÌà0 U àb)à0U$U$àIf€the€existing€power€supply€is€found€to€be€unreliable,€an€emergency€power€supply€orÐ Äl  Ðdetention€facility€shall€be€provided.€€Options€include:И@ $$ Ðà0 U àà0'U$U$àà0'$'$ài)à0× $$àElectrical€service€from€two€separate€commercial€power€companies,€providedÐ l Ðautomatic€switch€over€capabilities€are€in€effect;Ð@è× $× $ Ðà0 U àà0'U$U$àà0'$'$àii)à0× $$àElectrical€service€from€two€independent€feeder€lines€or€substations€of€the€sameÐ ¼ Ðelectric€utility,€provided€automatic€switch€over€capabilities€are€in€effect;Ðè× $× $ Ðà0 U àà0'U$U$àà0'$'$àiii)à0× $$àOn„site€automatic€starting€electrical€generators;мd× $× $ Ðà0 U àà0'U$U$àà0'$'$àiv)à0× $$àProposals€for€the€utilization€of€portable€units€shall€be€accompanied€by€a€detailedÐ 8 Ðreport€showing€conclusively€the€ability€of€such€a€system€to€function€satisfactorily.€Ð d  ÐPortable€units€will€be€approved€only€in€those€cases€where€the€station€is€equippedÐ 8à Ðwith€an€auto„dialer,€telemetry€device€or€other€acceptable€operator€notificationÐ  ´ Ðdevice,€operators€knowledgeable€in€acquisition€and€startup€of€the€portable€unitsÐ àˆ Ðare€on€24„hour€call,€the€station€is€accessible€in€all€weather€conditions,€reasonableÐ ´\ Ðassurances€exist€as€to€the€timely€availability€and€accessibility€of€the€properÐ ˆ0 Ðportable€equipment,€and€the€station€is€equipped€with€properly€designed€and€testedÐ \ Ðquick€connection€facilities.Ð0Ø× $× $ ÐÌà0 U àà0'U$U$àc)à0'$'$àProvisions€should€be€made€to€restore€the€lift€station€to€service€within€four€hours€of€outage.ÐØ€ $$ ÐÌà0 U àà0'U$U$àd)à0'$'$àA€spill€containment€structure€should€be€considered€together€with€in„system€retention€inÐ €(" Ðdetermining€a€total€wastewater€retention€time.€€Because€separate€spill€retention€facilitiesÐ Tü# Ðare€not€suitable€for€all€locations,€engineers€should€check€with€the€commission€prior€toÐ ( Ð$ Ðdesigning€such€structures.€€The€design€shall€provide:Ðü ¤%$$ Ðà0 U àà0'U$U$àà0'$'$ài)à0× $$àa€minimum€storage€volume€of€average€design€flow€from€the€contributing€area€andÐ Ð!x& Ðthe€longest€power€outage€during€the€most€recent€consecutive€24„month€period€or,Ð ¤"L ' Ðif€power€records€are€not€available,€an€assumed€24„hour€outage;Ðx# !(× $× $ Ðà0 U àà0'U$U$àà0'$'$àii)à0× $$àan€impermeable€liner€(20€mil€thickness)€and€should€have€an€energy€dissipator€atÐ L$ô!) Ðthe€point€of€overflow€from€the€lift€station€to€prevent€scour;Ð %È"*× $× $ Ðà0 U àà0'U$U$àà0'$'$àiii)à0× $$àa€fence€with€a€controlled€access;€andÐô%œ#+× $× $ Ðà0 U àà0'U$U$àà0'$'$àiv)à0× $$àa€plan€for€routine€cleaning€and€inspection.ÐÈ&p$,× $× $ ÐÌà0 U àà0'U$U$àe)à0'$'$àAn€audio„visual€alarm€system€(red€flashing€light€and€horn)€shall€be€provided€for€all€liftÐ p(&. Ðstations.€€These€alarm€systems€should€be€telemetered€to€a€facility€where€24€hourÐ D)ì&/ Ðattendance€is€available.€€The€alarm€system€shall€be€activated€in€case€of€power€outage,Ð *À'0 Ðpump€failure€or€a€specified€high€water€level.Ðì*”(1$$ ÐØ! !ØÓ€ N(e¤88MÓÌØ! !ØÓ€ S(U¤88NÓÝ"‚>3£"ÝÝ  ÝÝ‚>3£ _ÝÔ2U¤ÔÚ  Ú17Ú  Ú.Ô3  Ôà0 U àÝ  ÝThe€discharge€pipe€level€from€the€sump€pumps€shall€be€above€the€maximum€liquid€level€of€the€wetÐ ”,<*3 Ðwell.€€A€check€valve€should€be€installed€on€the€discharge€side€of€each€sump€pump.݃>3£ _Í_ÝŒÐh-+4U$U$ ÐŒÝ  ÝÌÓ€ O(¤88SÓÌÓ€ D(ú½88OÓò òTHESE€LIFT€STATION€AND€FORCE€MAINS€CONSTRUCTION€NOTES€MUST€BE€INCLUDED€ON€THEÐ ¨ ÐCONSTRUCTION€PLANS€PROVIDED€TO€THE€CONTRACTOR€AND€ALL€SUBCONTRACTORS.ó óÔ#†?XX%?&"V#Ô