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www.arcnevada.com
801‐597‐6873
Edi/on1.0
NicoleHaynesMcCoy,PhD
COPYRIGHT2012
AllRightsReserved
ARC Nevada
CONTENTSChapter1:Introduc1ontoUnderground
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐StorageTankCompliance 1ChapterOverview 1EnvironmentalandRegulatoryContext 1
RegulatedSubstances 2PetroleumProducts 2HazardousSubstances 3
PurposeofThisHandbook 3Organiza1on 4
Chapter2:USTProgramRulesand‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐Regula1ons 5
ChapterOverview 5USTRegulatoryStatus 5ProvisionsoftheEnergyActof2005 5Regula/onsforCompliance 6
OwningorOpera1ngaUSTinNevada 7PermitsandFees 7FinancialResponsibility 7DeliveryProhibi/on 8SecondaryContainment 9No/fica/on 11Record‐keeping 11
RequirementsforTankClosure 12TemporaryClosure 12PermanentClosure 13
‐‐‐Chapter3:ABCOperatorRequirements 15ChapterOverview 15OperatorRequirements 15ClassAOperator 15ClassBOperator 15ClassCOperator 16UnmannedFacili/es 16
TrainingandRegistra1on 17ClassAandBOperators 17ClassCOperators 17RetrainingforNon‐Compliance 17
‐‐‐‐‐‐‐Chapter4:USTSystemComponents 19ChapterOverview 19
USTSystem 19USTSystemComponents 19USTSystemFunc1on 21
‐‐‐Chapter5:SpillandOverfillPreven1on 23ChapterOverview 23Introduc1on 23Table5.1Spillandoverfillpreven3on:Equipmentrequirements 23
SpillPreven1on 24SpillBuckets 24
OverfillPreven1on 25OverfillPreven/onEquipment 26
Table5.2.Overfillpreven3ondevices:Func3onalrequirements 30
Owner/OperatorResponsibili1esinPreven1ngOverfills 30
Table5.3Spillandoverfillpreven3ondevices:Operatorinspec3on 31
‐‐‐‐Chapter6:ReleaseDetec1onforTanks 33ChapterOverview 33Introduc1on 33LeakDetec/onFramework 34
Table6.1.Leakdetec3onfortanks:Requirementoverview 34
In‐TankMonitoring(Automa1cTankGauging) 35ATGPeriodic(Sta/c)Tes/ng 36ATGCon/nuousTes/ng 37TankTestLimita/onsforATGs37
Table6.2.In‐TankMonitoring(Automa3cTankGauging) 38
SecondaryContainmentwithInters11alMonitoring 39ManualInters//alMonitoring 39Con/nuousInters//alMonitoring 40
Table6.3.SecondaryContainmentwithInters33alMonitoring 41
Sta1s1calInventoryReconcilia1on 42SIRProcess 42
Table6.4.Sta3s3calInventoryReconcilia3on(SIR) 44
InventoryControlandTankTightnessTes1ng 45
Table6.5.InventoryControlandTankTightnessTes3ng 46
ManualTankGauging 47Table6.6.ManualTankGaugingwithTankTightnessTes3ng 48
GroundwaterMonitoring 49VaporMonitoring 49Table6.7.Releasedetec3onfortanks:Systemscompared 51Table6.8.Leakdetec3onfortanks:Operatorinspec3on 52
‐‐‐‐Chapter7:ReleaseDetec1onforLines 53ChapterOverview 53Introduc1on 53Table7.1.LeakDetec3onforPiping:Requirementoverview 53
TypesofSuc/onPiping 54PressurizedPipingSystems 56CatastrophicReleaseDetec/on 57SecondaryLeakDetec/on 59
Table7.2.Lineleakdetec3on:Methodandtes3ngrequirements 63
Table7.3.LeakDetec3onforPiping:Operatorinspec3on 64
ContainmentSumps 64SumpComponents 65
Table7.4.SumpsandDispensers:Operatorinspec3on 66
‐‐‐‐‐‐‐‐‐‐‐‐‐Chapter8:CorrosionProtec1on 67ChapterOverview 67Table8.1.CorrosionProtec3on:Requirementoverview 67
Introduc1ontoCorrosion 68CathodicProtec1on 68CorrosionProtec1onRequirementsbyUSTSystemMaterial 70TankMaterials 70PipingMaterials 71
Table8.2.Corrosionprotec3onsummarybymaterial 72
Tes1ngCPSystems 72Table8.3.Cathodicprotec3on:Operatorinspec3on73
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐Chapter9:Compa1bility 75ChapterOverview 75Compa1bility 75Table9.1.Compa3bilityoverview 75
Alterna1veFuels 76Ethanol 77Biodiesel 78
‐‐‐‐‐‐‐‐‐‐Chapter10:EmergencyResponse 79ChapterOverview 79Introduc1on 79Table10.1.Emergencyresponse:Requirementoverview 79
AlarmsorUnusualCondi1ons 80AlarmResponse 80UnusualCondi/ons 80
SuspectedReleaseInves1ga1on 81Inves/ga/onSteps 81
Release/SpillResponse 82EmergencyPlanning 82
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐Chapter11:MarinaUSTs 83ChapterOverview 83Introduc1on 83Table11.1.Marinas:RequirementOverview 83
OwningorOpera1ngaMarinaUSTinNevada 84
TankRequirements 85SecondaryContainment 85Tankfillingequipment 86Monitoring 86
PipingandValveRequirements 86EmergencyShutoff 86SecondaryContainment(forpiping) 86PipingatFloa/ngMarinas 87
DispensingEquipment 87RequiredDailyInspec/on 87RequiredMonthlyInspec/on87
CorrosionProtec1on 88‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐Defini1ons 89
Chapter 5: Spill and Overfill Prevention
Chapter OverviewThischapterfocusesonspillandoverfillpreventionduringdeliveries.Topicscoveredinclude:‣ Spillandoverfillprotectionequipment
suchasspillbuckets,automaticshutoffdevices,ballfloatvalves,andoverfillalarms;
‣ Owner/operatorresponsibilitiesinpreventingoverfills;
‣ Operatorinspectionofspillandoverfillpreventionequipment.
IntroductionRecallthatpreventionofspillsandoverfillsisacriticalcomponentofthepreventionanddetectionrequirementsforUSTownersandoperators.TheU.S.Environmental
ProtectionAgency(EPA)designedpartofthetechnicalregulationsforundergroundstoragetank(UST)systemstoprevent
releasesfromUSTs.TheregulationsrequireUSTstobeprotectedfromspills,overfills,andcorrosion.
Spilloroverfillmeansanyreleaseofaregulatedsubstancethatoccurs:(a) Abovethesurfaceofthegroundata
facilitywhereastoragetankislocated;(b) Fromadispenserformotorfuelabovethe
sheervalveforthedispenser;orc) Fromanyancillaryequipmentforthetanksystemthat:
(1) Isnotincludedinanysystemforthedetectionofaleak;and
(2) Isaccessibletovisualinspection (fromNAC459.996)
TABLE5.1SPILLANDOVERFILLPREVENTION:EQUIPMENTREQUIREMENTS
SPILLANDOVERFILLPREVENTIONEQUIPMENTREQUIREMENTSSPILLANDOVERFILLPREVENTIONEQUIPMENTREQUIREMENTS
What EnsureyourUSTisproperlyequippedwithspillandoverfillpreventionequipment.
How Spillprevention:spillbuckets‐properlyinstalled,sized,keptclean,dryandingoodconditionOverfillprevention:automaticshutoffdevices,ballfloatvalves,oroverfillalarms.
When Devicesinstalledatinstalla/on;ongoingmaintenanceitem.
Why Federal40CFR280.20PerformancestandardsfornewUSTsystems.(c)Spillandoverfillpreventionequipment.40CFR280.21UpgradingofexistingUSTsystems.(d)Spillandoverfillpreventionequipment.40CFR280.30Spillandoverfillcontrol.
Who Owner/Operatorresponsibleforhavingproper,functionalequipment.
NOTE IfanUSTneverreceivesmorethan25gallonsata3me,theUSTdoesnothavetomeetthespillprotec3onrequirements.Manysmallusedoiltanksfallintothiscategory.
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Spill Prevention ManyreleasesatUSTsitescomefromspills.Spillsoftenoccuratthefillpipewhenthedeliverytruck’shoseisdisconnected.Althoughthesespillsareusuallysmall,repeatedsmallreleasescancausesignificantenvironmentalproblems.Humanerrorcausesmostspills.Thesemistakescanbeavoidedbyfollowingindustrystandardpracticesfortankfilling.Ifyouandthedeliverydriverfollowstandardpractices,nearlyallspillscanbeprevented.Forthisreason,federalUSTregulationsrequirethatyoufollowindustrystandardpracticesfortankfilling.
SpillBucketsEPArequiresthatallfillpipeshaveaspillpreventiondeviceinstalledaroundthem.OnlyUSTsystemsthatarefilledby25gallonsorlessareexemptedfromthisrequirement.
Spillbuckets,alsocalledcatchmentbasins,arecontainedsumpsatthefilland/orvaporrecoveryconnectionpoints.
Thespillbucketshouldbelargeenoughtocontainwhatmayspillwhenthedeliveryhoseisuncoupledfromthefillpipe.Atypicaldeliveryhosecanholdabout14gallonsoffuel.
Spillbucketsarenormallylocatedontopofthetankandarepositionedbelowgrade.Thetopofawell‐constructedspillbucketisslightlyabovegradetohelpdrainrainandsurfacewaterawayfromthespillbucketopening.Thatpreventsunwantedliquid
fromgettingintothespillbucketonitswaytoyourtank.
Thereisnocapacityrequirementforspillbucketsandmostrangeinsizefrom5to
25gallons,withlids1‐2feetindiameter.Some/messpillbucketlidswillbecolor‐
codedtohelpthedriverputtherightproductintotherighttank.
Spillbucketsmustbeliquid/ghtinorderforthemtofunc/onasintended(andasrequiredbyEPA)—tokeepsmallspillsattheendofadeliveryfromgefngintothe
soil.Asshowninthediagramsthatfollow,spillbucketsmaycomeequippedwitheitherapumpordraintoremovefuel.Drainvalvesallowexcessfueltobedraineddirectlybackintothetank.Aslongasthedrainvalveis/ght,thisdeviceshouldn’tposeaproblemtoopera/ons.Inaddi/ontospilledfuel(andperhapsevenmorefrequently),waterandsedimentcangetintospillbuckets.Ifyourspillbucket
Federalregulations(40CFR280.20(c))requireUSTsystemstobeequippedwithbothspillpreventionandoverfillpreventionequipment.
Federalregulation40CFR280.20(c)(i)requiresspillpreventionequipmentthatpreventsareleaseofproducttotheenvironmentwhenthetransferhoseisdetachedfromthefillpipe(forexample,aspillcatchmentbasin).
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Spillbuckets,alsocalledcatchmentbasins,comeinmanydifferentdesignsandsizes.BesuretoselectonethatisappropriateforyourUST.
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comeswithadrainthatflowsdirectlyintothetank,youdon’twanttodrainwaterintoyourtank.Waterinthetankisa fuelqualityissue,butanevengreaterconcernisthatwatercanruststeeltanksfromtheinside out,and,inexcess,canimpactyourabilitytodetectleaks.
Ifyourspillbucketdidn’tcomeequippedwithapump,youcanpurchaseasparkfreehandpumptodrawthewaterandsedimentoutofthespillbucket.Note:Ifthismixturecontainsfuelorchemicals,makesureyoudisposeofitproperly,asitmaybeconsideredhazardouswaste.
Spillbucketstakealotofabusefromweather,spilledfuel,drivers,snowplowsandotherfactors.TheyagequicklycomparedtootherpartsoftheUST.Checkthemregularlyandbepreparedtoreplacethemperiodically.
Spillbucketsdon’tkeepthefueloutofthegroundiftheyarenotliquidtight.Monitorthemforcracksorholesinthebottom,keepaneyeonthesealaroundthefillpipe,
Spillbucketcontainingspilledfuel.
andlookforcracksinthebellows.Don’tleavefuelinthem;itdegradestheplasticandcanseepoutthesealorthreadsovertime.Keepthemcleansoyoucandrainexcessfuelintothetankwithoutcontaminatingyourfuel.
Ifaspillbucketisfullofwateritcannotcontainaspill.
Whatshouldyoulookfor?Anyoneofthefollowing:
‣ waterorfuelinthebottom–removeit;‣ debrisofanykindthatdoesn’tbelong
there–removeit;‣ brokenordamageddrainvalve–repairit;
and‣ anyholesorcracksinside‐wallsor
bottom–replacethespillbucket.
Overfill PreventionIfdeliverydriversorUSTownersmakefueldeliverymistakes,atankcanbeoverfilledquicklyandlargevolumescanbereleasedatthefillpipeandthroughloosefittingsonthetopofthetankoralooseventpipe.
Overfillsusuallyresultfromhumanerrorandcanbeavoidedifeveryoneinvolvedinthefueldeliveryfollowsindustrystandardpracticesfortankfilling.
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Spillbucketequippedwithdrain(A)andaspillbucketequippedwithapump(B).
A B
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Overfillsusuallyreleasemuchlargervolumesthanspills.Whenatankisoverfilled,largevolumescanbereleasedatthefillpipeandthroughloosefittingsonthetopofthetankoralooseventpipe.Note:Thetightnessofthesefittingsnormallyisnotaproblemifthetankisnotfilledbeyonditscapacity.
Accidentallyoverfillinganundergroundstoragetankcanhappenveryquicklyiftheproperoverfillprotectionmeasuresarenotfollowed.
Thinkaboutthefillingprocess:Ahosefroma10,000‐gallontankertruckisconnectedtoafillpipe.Ifthefillprocessisgravity‐driven(andmostare),thedriverturnsavalvetoopenahoseandthefuelflowsin–atabout300gallonsaminute.
Nowimagineifthere’snotenoughroominthetank—someonedidn’tmeasurethecorrectliquidlevel,orthewrongtankisbeingfilled:ineithersituation,anoverfillwilloccur–atabout300gallonsaminute!
Ownersandoperatorscanpreventthepotentialforoverfillproblemsby:
‣ ensuringthereisenoughroominthetankforthedeliverybeforethedeliveryismade;
‣ watchingtheentiredeliverytopreventoverfillingorspilling;and
‣ usingoverfillprotectiondevices.
OverfillPreventionEquipmentYourUSTmusthaveoverfillprotection.
The water tap on
a bathtub flows at approximately 5 gallons per minute. Filling the average American bathtub at
300 gallons per minute would take
less than 10 seconds!
NewUSTsmusthaveoverfillprotectiondeviceswhentheyareinstalled.OlderUSTsshouldhavebeenupgradedby1998withspillandoverfillpreventiondevices.
Overfillpreventiondevicesworkinoneofthreeways:Placedinthefillpipe,theystoptheflowoffuel.Installedintheventpipe,theysloworrestricttheflowoffuel(butdonotstopitentirely).Alarmsneitherstopnorrestrictflowinandofthemselves,butalertthedriver(andpotentiallytheoperator)thatthetankisnearlyfull.
Thethreemaintypesofoverfillprotectiondevicesare:
1. Automaticshutoffdevices(stopstheflowoffuel)
2. Ballfloatvalves(slowstheflowoffuel)3. Overfillalarms(alertsthedriver).
AutomaRcShutoffDevicesOfthethreetypesofoverfillprotectiondevices,theautomaticshutoffdevice(ASD)istheonlyonecapableofcompletelystoppingtheflowoffuel.DependingonthetypeofASDinstalled,itmayslowtheflowoffuelbeforestoppingitorbesettotrip,stoppingtheflowabruptly.
Federalregulation40CFR280.20(c)(ii)requiresoverfillpreventionequipmentthatwill:
‣ Automaticallyshutoffflowintothetankwhenthetankisnomorethan95percentfull;or
‣ Alertthetransferoperatorwhenthetankisnomorethan90percentfullbyrestrictingtheflowintothetankortriggeringahigh‐levelalarm;or
‣ Restrictflow30minutespriortooverfilling,alerttheoperatorwithahigh‐levelalarm1minutebeforeoverfilling,orautomaticallyshutoffflowintothetanksothatnoneofthefittingslocatedontopofthetankareexposedtoproductduetooverfilling.
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Builtintothefillpipe,theASDisessentiallyatubeinsideofwhichisavalve(oftencalleda“flapper”valve)connectedtoafloat.Asthefuellevelrises,itliftsthefloatfromaverticaltohorizontalposition.Whenthetankisnearlyfull(inNevada,therequiredsettingisatamaximumof95%capacity),thefloatarmisatfullheight,andtheshutoffvalveiscompletelyclosed.
IfyouhaveanASDinstalledonyourtank,lookdownthefillopeningandseeifyoucanspotthemechanism.
Ifyouhaveatwo‐valvesystem,afterthemainvalvecloses,abypassvalveallowsasmallamountofproducttoflow(5to10
gallonsperminute)sothatthehosecanbedrained.Ifthedeliverycontinuesbeyondacertainlevel,thebypassvalvealsocloses.
Anopenautoma/cshutoffvalve(A),andclosed(B).
A B
Oncethebypassvalvecloses(onatwo‐valvesystem)orthemainvalveshuts(onaone‐valvesystem),fuelistrappedinthehose.
Thispreventsanoverfill,butthebackupoffuelupthehosemeansthereisnoplaceforthefueltogo(recallthatmosttanksaregravityfilledandfuelcan’tbepumpedbackintothetruck).Asaresult,thehosemustremainconnectedtothetankuntilfuellevelsinthetankdropenoughforthefloattorelax,releasingtheshutoffvalveandallowingtheremainderofthefueltoflowintothetank.
Ifanoverfilldoesoccur,solongasthedeliveryhoseistight,thereshouldn’tbeaspillontheground—atleastuntilthehoseisdisconnected.Beawarethatthereisalotmorefuelinthehosethanwillfitinthespillbucket.
HavinganASDdoesn’tguaranteethatanoverfillwon’thappen.Commonsourcesoffailureinclude:
‣ Brokendevice;‣ Devicebypassedbystickorotherobject;
and
Automatic shutoff devices are commonly referred to as
drop-tube devices or “flapper”
valves.
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Ballfloatvalve.Overfillalarm. Automa/cshutoffdevices.
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‣ Deviceinstalledwrongoratincorrectheight.
Sometimesattemptsaremadetooverridetheoverfilldevicebyusingastickorotherobjecttoforcethefloatmechanismdownandkeepthevalveopen.Thiscanoccurifthevalvehasactivatedanddeliverypersonnelareforcedtowaituntilthefuelclearsthehose,orifthevalvehasn’tshutofftheflowoffuel,butisslowingdownanormaldelivery.
Abypassedorbrokendeviceincreasesthechancesofanoverfillthatresultsinasignificantspill.Beawarethatowners(notdrivers)areliableforspillsandoverfillsthatoccurduringdelivery.
EPAsproposedregulationsrequirethatyouhavetheautomaticshutoffcheckedforproperproductlevelheightsettingatleastonce,andthenonceayearhaveatechnicianorthirdpartyinspectorvisuallyinspectthedevice.Keepacopyofyourtestresultsandcorrectanyproblems.
EPAalsoproposestorequirethatUSTownersandoperatorsinspectoverfillpreventionequipmentforfunctionandfillpipesforpotentialobstructionsevery30days.
BallFloatValves
Recallthatalltanksareventedandthattheventpipespreventthebuildupofpressureinthetankbyallowingpetroleumvaporstoescape.Duringafueldelivery,thetank“exhales”outtheventasthefuelcomingintothetankdisplacesthepetroleumvaporsandpushesthemout.
Ballfloatsconsistofashortlengthofpipethatextendsdownintothetopofthe
Ball float valves
are also known as float-vent valves.
tankfromtheventopening.Typicallyawirecagecontainingahollowballisfastenedtothelowerendofthepipe.Theballsitsbelowtheendofthepipewithinthewirecage.Aslongastheproductisbelowthatoftheball,thetankventpiperemainsopenandthetankcanbreathe.
Ifthefuellevelistoohigh,theballfloatsupandblockstheventopening(inNevada,theballfloatvalvemustac/vate
whenthetankisnomorethan90%full).
Withthetankbeingunableto“exhale”asitnormallydoes,itbecomesmoredifficulttofillthetank,whichshouldalertthedrivertoclosethetruck’sshutoffvalve.
Whenyourelyonaballfloatventvalve,youwanttowatchoutforthefollowing:
‣ Theballismissing.Thecagecanrustoutorbecomebentoutofshape;
‣ Theballwon’tfloat.Itcanrustontothecageorcorrodethroughandfillwithproduct;
‣ Thevalveisinstalledwrongoratincorrectheight;
‣ Aremotefillopeningorothertank‐topriserisnotliquid/ght.Thisallowsthetanktoexhaleevenauerthefuellevel
Illustra/onofhowaballfloatventvalveoperates.
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pushestheballintotheventopening,preven/ngapressurebuildupfromsignalingthatthetankisfull.
Ballfloatsareincompa/blewith:
‣ Suctionpiping–productcanbeforcedouttheaireliminator,
‣ Pressurizeddeliveries–itcouldblowyourtankoutattheseams,
‣ Stage1coaxialdroptube–itcanpushfuelupthevaporreturnintersticeandbackintothetruck.
Ifyourfacilityhastwo‐pointvaporrecoverywithaballfloat,ensurethatthevaporrecoverypoppetremainsfreeofrocksorotherobstructionsasthesedisabletheballfloatdeviceandcanbeanairqualityviolation.
Wesuggestthatyouhavetheballfloatventvalvecheckedforproperproductlevelheightsefngatleastonce,andthenonceayearhaveatechnicianorthirdpartyinspectorvisuallyinspectthedevicetomakesuretheballiss/lldoingwhatit’s supposedtodo.Keepacopyofyourtestresultsandcorrectanyproblems.
OverfillAlarmsOverfillalarmsdon’tstopfuelfromflowing,buttheydoalertthedriverthatanoverfillincidentisabouttooccur.Ofthethreeoverfillpreventiontechnologies,theyarethemostversatileinthattheycanbeusedwitheithergravityorpumpeddeliveriesandwithtightorlooseconnections.
Overfillalarmsuseprobesinstalledinthetank(seeillustration)toactivateanalarmwhenthetankiseither90percentfullorwithin1minuteofbeingoverfilled.Typicallyoverfillalarmsaretiedintoanautomatictankgaugingsystem(ATG).Thealarmmaybeeitherablinkingredlight,a
siren(mostcommon),orboth.Makesurethealarmislocatedwherethedrivercanseeorheariteasily.
Althoughnotrequired,someoverfillalarms aresettoactivateatmultiplelevels:
‣ 90%full:Highproductalarm(requiredminimumsetting–youhaveaboutaminute);
‣ 95%full:High‐highproductalarm(youhavelessthan1minute);and
‣ 100%full:Maxproductalarm(it’stoolate).
Overfillalarmsworkonlyiftheyalertthedriverattherighttimeandthedriverrespondsquickly.Problemswithoverfillalarmscaninclude:
‣ Overfillsettingincorrectlyprogrammedsothealarmgoesofftoolate.
‣ Communicationtothetankgaugeisn’tworking.
‣ Alarmboxmalfunctioningorbroken.Driverisn’tnearbytohear/seealarmandrespond.
‣ Overfillalarmactivatesbutnooneresponds.
‣ Overfillalarmconnectedtoanelectricalcircuitthatcanbeturned“off”orthatdoesnotalertifacircuitbreakeristripped.
Wesuggestthatyouhavetheoverfillalarmcheckedforproperproductlevelheightsettingatleastonce,andthenonceayearhaveatechnicianorthirdpartyinspectorfunction‐testthealarmbox,thewiring,andthefloat.Keepacopyofyourtestresultsandcorrectanyproblems.
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TABLE5.2.OVERFILLPREVENTIONDEVICES:FUNCTIONALREQUIREMENTS
OVERFILLPREVENTIONDEVICES:FUNCTIONALREQUIREMENTSOVERFILLPREVENTIONDEVICES:FUNCTIONALREQUIREMENTS
What USTmusthaveatleastonedevicefromthelistbelow:‣ automaticallyshutoffflowintothetankwhenthetankisnomorethan95
percentfull;or‣ restricttheflowintothetankortriggeringahigh‐levelalarmwhenthetank
isnomorethan90percentfull;or‣ restrictflow30minutespriortooverfilling,alerttheoperatorwithahigh‐
levelalarm1minutebeforeoverfilling,orautomaticallyshutoffflowintothetank.
How ‣ Automaticshutoffdevices(mustshutoffflowwhentankis≤95%full)‣ Ballfloat(vent)valves(mustrestrictflowwhentankis≤90%full)‣ Overfillalarms(mustalarmwhentankis≤90%full)
When Requiredattankinstalla/onfortanksinstalledauer1986;Requiredupgradetoexis/ngtankssince1998
Why Federal40CFR280.20(c)(ii)‐ Spillandoverfillpreven/onequipment40CFR280.30‐SpillandOverfillControl(Owner’sResponsibili3es)
Who Ownerresponsibleforhavingproperdevice.
NOTE Manufacturersdonotrecommendusingballfloatvalveswithsuc3onpiping,pressurizeddelivery,orcoaxialStageIvaporrecovery.
Owner/OperatorResponsibilitiesinPreventingOverfillsAsthepersonwhoislegallyresponsibleforensuringthatoverfillsdonothappenduringfueldeliveriesatyourUSTfacility,developawridendeliveryprocedurethatallpersonnelinvolvedinthedeliveryprocessfollow.Thisprocedureshouldincludethefollowingmeasures:
Ensurethereisenoughroominthetankbeforeeachdelivery.Measurethefuellevelinyourtank(s)beforeeachdelivery.Knowtheworkingcapacityofyourtank(s).(Theworkingcapacityistheamountoffuelthetankwillholdwithouttriggering
theoverfillpreven/ondevice).Ifyouhaveatankgauge,orderyourfuelbasedonthe90%ullagereadingfromthetankgauge.
Monitorallfueldeliveriesfrombeginningtoend.Deliverydriversmaybemorecarefulifsomeoneiswatching.Usesecuritycamerastomonitorthedeliveryprocessandletthedriversknowthattheyareoncamera.
Inspectyourspillbucketsrou1nely.Ifnecessary,cleanbeforeandaiereachproductdelivery.
Respondtoalloverfillindica1ons.Ifatankgaugeisaler/ngtoanoverfill,makesurebothyourstaffandthedriverrespondappropriately.Neverignoreanalarm.Anoverfillmeansyouhaveordered
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toomuchfuel;re‐evaluatethemethodsusedtocalculatehowmuchfueltoordertopreventafutureoverfill(orpoten/alspill).
Prepareforspillsthatcanoccurdespiteawell‐func1oningoverfillpreven1onsystem.Hosescanbreak,adrivercandisconnectahosewithoutrealizingthetankisover‐filled,oralooseriser
somewhereonatankcanpreventaballfloatvalvefromfunc/oning.Makesureyouhaveanemergencyplaninplaceforwhattodoifanoverfilloccursandthatdeliverydrivers,operators,andotherpersonnelareawareoftheproceduresandtheirresponsibili/esincaseofanoverfillemergency.
TABLE5.3SPILLANDOVERFILLPREVENTIONDEVICES:OPERATORINSPECTION
SPILLANDOVERFILLPREVENTIONDEVICES:OPERATORINSPECTIONSPILLANDOVERFILLPREVENTIONDEVICES:OPERATORINSPECTIONSPILLANDOVERFILLPREVENTIONDEVICES:OPERATORINSPECTION
What Checkspillandoverfillpreven/onequipmentforfunc/onandobstruc/ons.Checkspillandoverfillpreven/onequipmentforfunc/onandobstruc/ons.
How SpillBuckets‣ Lidsareingoodcondition,fittightly‣ Shouldn’thaveanyvisibleholes,cracks,or
damagedareas‣ Shouldn’tbedeformedorwarped‣ Basinshouldbeclean,dry,andfreefromdebris
OverfillPreventionEquipment‣ Allfillsareunobstructed‣ Automaticshutoffvalvesorballfloats
arepresentandfunctional‣ Overfillalarmisproperlylocatedand
clearlyidentified
When ‣ Required:Atinstallation(ifrequiredbymanufacturer)‣ Proposed:Atinstallation(regardlessofmanufacturer’srequirements)‣ Proposed:Every30days‣ Proposed:Testspillpreventionequipmentatleastonceevery12months
‣ Required:Atinstallation(ifrequiredbymanufacturer)‣ Proposed:Atinstallation(regardlessofmanufacturer’srequirements)‣ Proposed:Every30days‣ Proposed:Testspillpreventionequipmentatleastonceevery12months
Why Federal:40CFR280.37(proposed)40CFR280.35(proposed)
Federal:40CFR280.37(proposed)40CFR280.35(proposed)
Who ClassBOperatorortheirdesignee.ClassBOperatorortheirdesignee.
NOTE Proposedfederalregula3onswillrequireoperator“walkthrough”inspec3onsofspillandoverfillpreven3onequipmentevery30daysandhavespillpreven3onequipmenttestedatleastonceevery12months.
Proposedfederalregula3onswillrequireoperator“walkthrough”inspec3onsofspillandoverfillpreven3onequipmentevery30daysandhavespillpreven3onequipmenttestedatleastonceevery12months.
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