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t ARF # 16774
IUnitedUnited StatesStates DepartmentDepartment ofofEnergyEnergy
SavannahSavannah RiverRiver SiteSite SRStsn$river silesavannahsavannah river site\
r\-/
ExplanationExplanation ofof SignificantSignificant DifferencesDifferences (ESD)(ESD) forfor thethe RevisionRevision 1 Interim RecordRecord ofof DecisionDecision RemedialRemedial AlternativeAlternative SelectionSelection forfor thethe
L lnterim
643'26E;E-AreaE-Area Low-LevelLow-Level WasteWaste Facility,Facility, 643-26E (Slit TrenchTrench DisposalDisposal UnitsUnits 11 andand 2)2) (U)(U)(Stit
CERCLIS Number:Number:CERCLIS 8686
SRNS-RP-2009-01128sRNS-RP-2009-01128
Revision 1Revision 1
JanuaryJanuary 20102010
E IVEDRECETTruD 1n? 01APP O! 20102010
:r ' liESSMElg" ~~ESSMEN1;_PreparedPrepared by:by; REMEOIATION&REMEDIATION " Savannah RiverRiver Nuclear Solutions, LLCLLCSavannah Nuclear Solutions, R$itTAtzAltrllAEVlTAUlAllON Savannah River SiteSavannah River Site Aiken, SCSC 2980829808Aiken, PreparedPrepared forfor U.S.U.S. DepartmentDepartment ofof Energy underunder ContractContract No.No. DE-AC09-08SR22470DE-AC09-08SR22470Energy
•
I 643-26E I (Lf
ESDESD forfor Rev.Rev. 1 IRODIROD E-AreaE-Area Low-LevelLow-Level WasteWaste Facility,Facility, 643-26E (Slit(Slit TrenchTrench DisposalDisposal UnitsUnits 1 andand 2)2) (U) I
SRNS-RP-2009-01128SRNS-RP-2009-01128 RevisionRevision 1
SavannahSavannah RiverRiver SiteSite JanuarvJannary 20102010
ARF # 16774
DISCLAIMERDISCLAIMER
ThisThis documentdocument waswas preparedprepared inin conjunctionconjunction withwith workwork accomplishedaccomplished underunder ContractContract No.No. DE-AC09-08SR22470DE-AC09-08SR22470 withwith thethe U.S.U.S. DepartmentDepartment ofof Energy.Energy.
ThisThis workwork waswas preparedprepared underunder anan agreementagreement withwith andand fundedfunded byby thethe U.S.U.S. Government.Government. NeitherNeither thethe U.S.U.S. GovernmentGovernment oror itsits employees,employees, nornor anyany ofof itsits contractors,contractors, subcontractorssubcontractors oror theirtheir employees,employees, makesmakes anyany expressexpress oror implied:implied: 1.1. warrantywarranty oror assumesassumes anyany legallegal liabilityliability forfor thethe accuracy,accuracy, completeness,completeness, oror forfor thethe useuse oror resultsresults ofof suchsuch useuse ofof anyany information,information, product,product, oror processprocess disclosed;disclosed; oror 2.2. representationrepresentation thatthat suchsuch useuse oror resultsresults ofof suchsuch useuse wouldwould notnot infringeinfringe privatelyprivately owned rights;rights; oror 3.3, endorsementendorsement oror recommendationrecommendation ofof anyany specificallyspecifically identifiedidentified commercialcommercial product,product, process,process, oror service.service. AnyAny viewsviews andand opinionsopinions ofof authorsauthors expressedexpressed inin thisthis workwork dodo notnot necessarilynecessarily statestate oror
ovrned
reflectreflect thosethose ofof thethe UnitedUnited StatesStates Government, oror itsits contractors,contractors, oror subcontractors.subcontractors.
Government
PrintedPrinted inin thethe UnitedUnited StatesStates ofof AmericaAmerica
PreparedPrepared forfor U.S.U.S. DepartmentDepartment ofof EnergyEnergy
andand SavannahSavannah RiverRiver NuclearNuclear Solutions, LLCLLC
Aiken, SouthSouth CarolinaCarolina Solutions.
ARF # 16774
(Slit(Slit TrenchTrench DisposalDisposal UnitsUnits II andand 2)2) (U)(U) RevisionRevision II
I.I. INTRODUCTIONINTRODUCTION................................................................................................. 1
II. SITESITE HISTORYHISTORY ANDAI\D SELECTEDSELECTED REMEDy ................................................. 211. REMEDY
BASISBASIS FORFOR THETHE EXPLANATIONEXPLANATION OFOF SIGNIFICANTSIGNIFICANT DIFFERENCE ...... 5III.ilI. DIFFERENCE......5
V.V STATUTORY DETERMINATIONS. STATUTORYDETERNIINATIONS ................................................................. 7
vII.VII. REFERENCESR_EFERE......................................................................................................NCES ........................88
RIVER SITERrvER SIT...............................................................................................E... ..............99
FIGUREFIGURE 2.2 LOCATIONLOCATION OFOF THE SLITSLIT TRENCHTRENCH DISPOSALDISPOSAL UNITSUNITS. TIIE FOOTPRINTFOOTPRINT WITHINWITHIN THETHE E-AREAE-AREA LLWFLLWF ...............................................1010
DESIGNDESIGN .................................................................................................... 1l11
TABLETABLE 1.I. PRESENT VALUE COST ESTIMATE FOR SLIT TRENCHPRESENTVALUECOSTESTIMATEFORSLITTRENCH
643-268 SRNS-RP-2009-01128ESDESD forfor Rev.Rev. II IRODIROD E-AreaE-Area Low-LevelLow-Level WasteWaste Facility,Facility, 643-26E sRNS-RP-2009-01128
SavannahSavannah RiverRiver SiteSite January 20102010Januarv
TableTable ofof ContentsContents
SECTIONSECTION PAGEPAGE
Iv. DESCRIPTIONDESCRIPTION OFOF SIGNIFICANTSIGNIFICANT DIFFERENCESDIFFERENCES ..................................... 6IV.
PUBLIC PARTICIPATION ................................................................................ 7VI.VI. PUBLICPARTICIPATION
ListList ofof Figures
FIGUREFIGURE 1.1. LOCATIONLOCATION OFOF THETHE E-AREAE-AREA LLWFLLWF WITHINWITHIN THETHE GENERALGENERAL SEPARATIONSSEPARATIONS AREAAREA ATAT THETHE SAVANNAHSAVANNAH
Fisures
FIGUREFIGURE 3.3. OPERATIONALOPERATIONAL STORMWATERSTORM\ilATER RUNOFFRUNOFF CONCEPTUALCONCEPTUAL
FIGUREFIGURE 4.4. INTERIMINTERIM REMEDIALREMEDIAL ACTIONACTION SCHEDULE...................................12SCHEDULE.....,............................,12
ListList ofof TablesTables
DISPOSALDISPOSAL UNITSUNITS 1 THROUGH 55 WITHWITH EIAEIA LINERLINER CAP ...........14I THROUGII CAP.....,.....14
I f
ESDESD forfor Rev.Rev. 1 IRODIROD E-AreaE-Area Low-LevelLow-Level WasteWaste Facility,Facility, 643-26E643-26E (Slit(Slit TrenchTrench DisposalDisposal UnitsUnits 1 andand 2)2) (U)(U)
SRNS-RP-2009-0I r2E I
SRNS-RP-2009-01128 RevisionRevision 1
SavannahSavannah RiverRiver SiteSite JanuaryJanuary 20102010
ARF # 16774
LISTLIST OFOF ACRONYMSACRONYMS ANDAND ABBREVIATIONSABBREVIATIONS
CERCLACERCLA ComprehensiveComprehensive EnvironmentalEnvironmental Response,Response, Compensation,Compensation, andand LiabilityLiability ActAct
cycy CubicCubic yardsyards eaea EachEach EIAEIA EthyleneEthylene InterpolymerInterpolymer AlloyAlloy ESDESD ExplanationExplanation ofof Significant DifferencesDifferences FFAFFA FederalFederal FacilityFacility AgreementAgreement ftft feetfeet ft3
Signifi cant
ft3 CubicCubic feetfeet IRAIPIRAIP InterimInterim RemedialRemedial ActionAction ImplementationImplementation PlanPlan IRODIROD InterimInterim RecordRecord ofof DecisionDecision
ItIt ItemItem km2kmz SquareSquare kilometerkilometer LLWFLLWF Low-LevelLow-Level WasteWaste FacilityFacility mm metermeter m3
3 CubicCubic metersmetersmNOUNOU UnacceptabilityNoticeNotice ofof Unacceptability o&M OperationOperation andand MaintenanceMaintenanceO&M OSROSR Off-SiteOff-Site RuleRule PAPA PerformancePerfonnance AssessmentAssessment PVPV PresentPresent ValueValue RCRARCRA ResourceResource ConservationConservation andand RecoveryRecovery ActAct SCDHECSCDHEC SouthSouth CarolinaCarolina DepartmentDepartment ofof HealthHealth andand EnvironmentalEnvironmental ControlControl sfsf SquareSquare feetfeet SRNSSRNS Savarurah fuverSavannah River NuclearNuclear Solutions,Solutions, LLCLLC SRSSRS SavarmahSavannah RiverRiver SiteSite USDOEUSDOE UnitedUnited StatesStates DepartmentDepartment ofof EnergyEnergy USEPAUSEPA UnitedUnited StatesStates EnvironmentalEnvironmental ProtectionProtection AgencyAgency WSRCWSRC WashingtonWashington SavannahSavannah RiverRiver CompanyCompany LLCLLC
ARF # 16774
ESDESD forfor Rev.Rev. 1I IRODIROD E-AreaE-Area Low-LevelLow-Level WasteWaste Facility,Facility, 643-26E643-26E SRNS-RP-2009-01128sRNS-RP-2009-01l2E (Slit(Slit TrenchTrench Disposal UnitsUnits 1 andand 2)2) (U)(U) SavannahSavannah RiverRiver SiteSite
Dirposal I
Jannary 2010January 2010
IntroductionI.L lntroduction
ThisThis ExplanationExplanation ofof SignificantSignificant DifferencesDifferences
(ESD)(ESD) is beingbeing issuedissued byby thethe UnitedUnited Siaies
ofof EnergyEnergy (USDOE),(USDOE), the leadlead
is Stales
DepartmentDepartment Ihe
agencyagency forfor thethe SavannahSavannah RiverRiver SiteSite (SRS)(SRS)
remedialremedial activ'ities, with concurrenceconcurrence byby thethe U.S.U.S.
Environmental ProtectionProtection -activities, wit}l
Enviromnental AgencyAgency (USEPA)(USEPA)
RegionRegion 44 andand thethe SouthSouth CarolinaCarolina DepartmentDepartment ofof
HealthHealth andand Enviromnental ControlControl (SCDHEC).(SCDHEC).
TheThe purposepurpose ofof thisthis ESDESD isis toto announceannounce thethe
incorporationincorporation ofof SlitSlit TrenchTrench DisposalDisposal UnitsUnits 3,3, 4,4,
Environmental
andand 55 intointo thethe interiminterim remedialremedial actionaction selectedselected inin
thethe interim RecordRecord ofof DecisionDecision forfor thethe E-AreaE-AreaInterim
(SIitLow-LevelLow-Level WasteWaste Facility,Facility, 643-26E643-26E (Slit TrenchTrench
DisposalDisposal UnitsUnits 1I andand 2) (U) (SRNS(SRNS 2009b).2009b).2J fU,
UnderUnder Enviromnental
Response,Response, Compensation,Compensation, andand LiabilityLiability ActAct
thethe ComprehensiveComprehensive Environmental
(CERCLA)(CERCLA) SectionSection 117(c), SRSSRS isis requiredrequired totoll7(c),
publishpublish anan ESDESD wheneverwhenever therethere isis aa significantsignificant
changechange toto aa componentcomponent ofof aa remedyremedy specifiedspecified inin
aa RecordRecord ofof Decision.Decision. Sections 300.435(c)(2)(i)300.435(c)(2)(i)
andand 300.825(a)(2)300.825(aX2) ofof thethe NationalNational OilOil andand
HazardousHazardous SubstancesSubstances PollutionPollution ContingencyContingency
PlanPlan requirerequire thethe leadlead agencyagency toto provideprovide anan
Seclions
explanationexplanation ofof thethe difference andand toto makemake thisthis
informationinformation availableavailable toto thethe publicpublic inin thethe
AdministrativeAdministrative RecordRecord FileFile andand informationinformation
differeDce
repositories.reposrtones.
TheThe E-AreaE-Area Low-LevelLow-Level WasteWaste FacilityFacility (LLWF)(LLWF)
waswas notnot partpart ofof thethe 19931993 FederalFederal FacilityFacility
AgreementAgreement (FFA)(FFA) (FFA(FFA 1993)1993) becausebecause thethe
USDOEUSDOE operatesoperates Ihe facilityfacility underunder thethe authorityauthoritythe
ofof thethe AtomicAtomic EnergyEnergy ActAct andand inin accordanceaccordance
RevisionRevision 11
PagePage 1 ofof ISI 15
withwith USDOEUSDOE OrderOrder 435.1,435.1, RadioactiveRadioactive WdsteWaste
ManagemenL InIn 1996,1996, thethe E-AreaE-Area SlitSlit TrenchTrenchManagement.
DisposalDisposal UnitsUnits werewere approvedapproved toto receiverecerve
CERCLACERCLA wastewaste perper thethe CERCLACERCLA Off-SiteOff-Site RuleRule
(OSR),(OSR), 4040 CodeCode ofof FederalFederal RegulationsRegulations §$
300.440.300.440. However,However, inin FebruaryFebruary ZOOT, thelhe2007,
USEPAUSEPA sentsent aa NoticeNotice ofof UnacceptabilityUnacceptability (NOU)(NOU)
toto thethe USDOEUSDOE makingmaking thethe E-AreaE-Area SlitSlit TrenchTrench
DisposalDisposal UnitsUnits unacceptableunacceptable forfor thethe receipl ofof
CERCLACERCLA wasle.wasle. TheThe USEPAUSEPA NOUNOU statedstated thatthat
receipt
throughthrough reviewsreviews andand communications,communications, itit waswas
determineddetermined thatthat tritiumtritium hadhad migratedmigrated fromfrom thethe
SlitSlit TrenchTrench DisposalDisposal UnitsUnits intointo thethe vadosevadose zonezone
beneathbeneath thethe disposaldisposal units. TheThe USDOE,USDOE,units. however,however, determineddetermined thatthat thethe tritiumtritium migrationmigration
waswas expectedexpected andand consistentconsistent withwith predictionspredictions
mademade byby Ihe PerformancePerformance AssessmentAssessment (PA)(PA)
(WSRC(WSRC 2008)2008) andand nono exceedenceexceedence ofof thethe USDOEUSDOE
the
OrderOrder 435.1 performanceperformance measuresmeasures hadhad occurred.43 5 . I occured.
In JulyJuly 2007,2007, representativesrepresentatives from thethe USDOE,USDOE,
USEPA,USEPA, andand thethe SCDHECSCDHEC metmet resolyed
ln iiom
andand resolved
issuesissues conceming disposaldisposal ofof CERCLACERCLAconcerning thethe
wastewaste inin thethe E-AreaE-Area LLWFLLWF SlitSlit TrenchTrench DisposalDisposal
Units.Units. AsAs partpart ofof thisthis agreement,agreement, thethe USDOEUSDOE
LLWF onon thethe FFFFAAplacedplaced thethe entireentire E-AreaE-Area 'LLWF
RCRA/CERCLA PlacingPlacing thetheAppendixAppendix C,C, RCRAICERCLA Units.Units.
E-AreaE-Area LLWF onon AppendixAppendix CC satisfiessatisfies thethe OSROSRLLWF
requirementrequirement forfor inclusioninclusion inin anan enforceableenforceable
agreement.agreement. Consequently,Consequently, thethe USEPAUSEPA restoredrestored
thethe OSROSR AcceptabilityAcceptability forfor thethe SlitSlit TrenchTrench
units totoDisposalDisposal Units,Units, allowingallowing thethe disposaldisposal unils
receive CERCLACERCLA waste.waste.receiYe
TheThe InterimInterim RecordRecord of Decision (IROD)(IROD) selectedselectedofDecision
the placementplacement ofof operationaloperational stormwaterstormwater runoffrunofftle covers overover SlitSlit TrenchTrench Disposal UnitsUnits II andand 22coven Disoosal
ARF # 16774
ESDESD forfor Rev.Rev. 11 IRODIROD E-AreaE-Area Low-LevelLow-Level WasteWaste Facility,Facility, 643-26E643-26E SRNS-RP-2009-01128sRNS-RP-2009-01128 (Slit(Slit TrenchTrench DisposalDisposal UnitsUnits 1I andand 2)2) (U)(U) SavannahSavannah RiverRiver SiteSite Jannary 20102010Januarv
asas anan interim remedialremedial action.action. TheThe IRODIROD alsoalsointerirn
explainedexplained thatthat additionaladditional SlitSlit TrenchTrench DisposalDisposal
UnitsUnits werewere toto bebe addedadded toto thethe FFAFFA asas theythey
reachedreached designdesign capacitycapacity (i.e.,(i.e., operationaloperational
andand anan ESDESD wouldwould be usedusedclosure)closure) be toto
incorporateincorporate thethe interiminterim remedyremedy selectedselected inin thethe
IRODIROD andand detaileddetailed inin thethe Interimlnterim RemedialRemedial
ActionAction Implementation PlanPlan (IRAIP).(IRAIP).lmplementation
SubsequentSubsequent toto thethe publicpublic comment periodperiod andandconment
submittalsubmittal ofof thethe InterimInterim ActionAction ProposedProposed PlanPlan
(SRNS(SRNS 2009a)2009a) SlitSlit TrenchTrench DisposalDisposal UnitUnit 55
becamebecame operationallyoperationally closed. SlitSlit TrenchTrenchclosed.
DisposalDisposal Units 33 andand 44 areare currently beingbeing filledfilled
andand will bebe operationallyoperationally closedclosed priorprior toto
Unils cunently
will
installationinstallation ofof thethe stormwater runoffrunoff covers.covers.stormwaier
Therefore,Therefore, thethe ESDESD forfor SlitSlit TrenchTrench DisposalDisposal
UnitsUnits 33 throughthrough 55 isis beingbeing developeddeveloped atat thisthis timetime
soso thatthat thethe lRAIP cancan bebe expandedexpanded toto discussdiscuss SlitSlit
TrenchTrench DisposalDisposal UnitUnit II throughthrough 5.5. TheThe
IRAIP
placement ofof stonnwater runoffrunoff coverscovers usingusing aa
30 milmil (minimum(minimum thickness)thickness) EthyleneEthylene
placemenl stormwater
30
InterpolymerInterpolymer AlloyAlloy (EIA)(EIA) linerliner capcap overover thethe SlitSlit
TrenchTrench DisposalDisposal UnitsUnits 1 throughthrough 55 asas anan interiminterim
remedialremedial actionaction willwill occuroccur duringduring thethe E-AreaE-Area
I
LLWF operationaloperational period.period.LLWF
TheThe ESDESD isis partpart ofof thethe AdministrativeAdministrative RecordRecord
FileFile andand isis availableavailable forfor publicpublic reviewreview duringduring
normalnormal businessbusiness hourshours atat the followingfollowingthe
repositories.reposilories.
USUS Department ofof Energy PublicPublic ReadingReading RoomRoom Gregg-GranitevilleGregg-Graniteville LibraryLibrary
Departnenl Eneryy
University ofof SouthSouth CarolinaCarolina - AikenAikenUnivenity -171171 UniversityUniversity ParkwayParkway Aiken,Aiken, SouthSouth CarolinaCarolina 2980129801 (803)(803) 641-3465641-3465
RevisionRevision 1I
PagePage 22 ofof 1515
ThomasThomas CooperCooper LibraryLibrary Government DocumentsDocuments DepartmentDepartment UniversityUniversity ofof SouthSouth CarolinaCarolina Columbia,Columbia, SouthSouth CarolinaCarolina 2920829208
Covemment
(803)(803) 777-4866777-4866
II. SiteSite HistoryHistory andand SelectedSelectedII. RemedyRemedy
ThisThis ESDESD documents thethe incorporationincorporation ofof SlitSlit
TrenchTrench DisposalDisposal UnitsUnits 3,3, 4,4, andand 55 intointo thethe
selectedselected interiminterim remedialremedial actionaction forfor SlitSlit TrenchTrench
DisposalDisposal UnitsUnits II andand 22 asas foundfound inin thethe IRODIROD
documenls
(sRNS(SRNS 2009b).2009b).
TheThe E-AreaE-Area LLWFLLWF isis locatedlocated inin thethe centralcentral
regionregion ofof thethe SRSSRS knownknown asas thethe GeneralGeneral
Separations AreaArea (Figure(Figure 1). RadioactiveRadioactive wastewaste
disposaldisposal operationsoperations atat thethe E-AreaE-Area LLWFLLWF beganbegan
Sepamtions l).
inin 1994.1994. TheThe E-AreaE-Area LLWF isis comprisedcomprised ofof 0.8 ILLWF 0.81
km' (200(200 acres),acres), althoughalthough onlyonly 0.400.40 km' (100(100km'z km?
acres)acres) havehave beenbeen developeddeveloped forfor waste disposal.disposal.wasle
OverOver thethe lifelife ofof thethe E-Area LLWF, additionaladditional
disposaldisposal unitsunits willwill bebe constructedconstructed asas needed.needed.
E-Area LLWF,
USDOEUSDOE OrderOrder 435.1435.1 establishesestablishes requirementsrequirements
forfor thethe managementmanagement ofof radioactiveradioactive wastewastre andand
requiresrequires thatthat aa PAPA bebe preparedprepared andand maintainedmaintained
forfor USDOEUSDOE low-levellow-level wastewaste disposeddisposed ofof afterafter
?6, 1988.1988. TheThe PAPA mustmust provideprovideSeptemberSeptember 26,
reasonablereasonable assuranceassurance thatthat thethe facilityfacility designdesign andand
methodmethod ofof disposaldisposal willwill complycomply withwith thethe
performanceperformance objectivesobjectives ofof thethe USDOEUSDOE Order,Order,
whichwhich areare concerned withwith protectionprotection ofof publicpublic
healthhealth andand safetysafety inin limitinglimiting dosesdoses toto membersmembers ofof
concemed
thethe publicpublic andand limitinglimiting releasesreleases of radon. TheThe PAPAofradon.
is,is, therefore,therefore, usedused toto determinedetermine thethe radionucIide
concentrationsconcentrations andand inventoriesinventories allowedallowed inin allall E-E
radionuclide
ARF # 16774
ESDESD forfor Rev.Rev. 1 IRODIROD E-AreaE-Area Low-LevelLow-Level WasteWaste Facility. 643-26E643-26E SRNS-RP-2009-01128I Facility, sRNS-RP-z009-01128 (Slit(Slit TrenchTrench DisposalDisposal UnitsUnits 1I andand 2)2) (U)(U) SavannahSavannah RiverRiver SiteSite JanuaryJanuary 20102010
AreaArea LLWFLLWF disposaldisposal unitsunits priorprior toto disposaldisposal soso
thatthat thethe performanceperformance measuresmeasures areare notnot exceeded.exceeded.
TheseThese SlitSlit TrenchTrench DisposalDisposal Units,Units, whichwhich areare
withinwithin E-AreaE-Area LLWF areare belowlocatedlocated thethe LLWF below
gradegrade earthenearthen disposaldisposal unitsunits usedused forfor disposaldisposal ofof
low-levellow-level radioactiveradioactive waste. EightEight SlitSlit TrenchTrench
DisposalDisposal Units,Units, designateddesignated SlitSlit TrenchTrench DisposalDisposal
UnitsUnits II throughthrough 8,8, havehave beenbeen sitedsited andand wastewaste hashas
beenbeen placedplaced withinwithin allall eighteight unitsunits (Figure(Figure 2).2).
EachEach SlitSlit TrenchTrench DisposalDisposal UnitUnit isis approximatelyapproximately
waste,
6.6.1I mm (20(20 ft)ft) deep,deep, 47.947.9 mm (157(157 ft)ft) wide,wide, andand
199.9199.9 mm (656(656 ft)ft) longlong andand isis separatedseparated intointo fivefive
individualindividual sections.sections. EachEach individualindividual sectionsection isis
6.6.1I mm (20(20 ft)ft) deep,deep, 6.6.1I mm (20(20 ft)ft) wide,wide, andand
approximatelyapproximately 199.9199.9 mm (656(656 ft)ft) long.long.
ApproximatelyApproximately 33 mm (10(10 ft)ft) toto 4.34.3 mm (14(14 ft)ft) ofof
undisturbedundisturbed soil separatesseparatcs eacheach individualindividualsoil
disposaldisposal sectionsection from thethe next. TheThe excavatedexcavated
soilsoil generatedgenerated duringduring disposaldisposal trenchtrench
constructionconshuction isis stockpiledstockpiled forfor laterlater placementplacement
overover disposeddisposed waste.waste.
fiom ncxt.
TheThe SlitSlit TrenchTrench DisposalDisposal UnitsUnits areare designeddesigned toto
acceptaccept low-levellow-level radioactivelyradioactively contaminatedcontaminated soil,soil,
rubble,rubble, woodwood debris,debris, concrete,concrete, equipmentequipment andjobandjob
(contamitrated clothing,controlcontrol wastewaste (contaminated protectiveprotective clothing.
plasticplastic sheeting,sheeting, etc.).etc.). TheThe wastewaste maymay bebe
disposeddisposed ofof asas bulkbulk wastewaste oror containedcontained withinwithin B-B
2525 boxes. B-12B-12 boxes,boxes, 55-gallon55-gallon drums, SealandSealandboxes, clrums,
containers, andand otherother metalmetal containers. TheThe SlitSlit
TrenchTrench DisposalDisposal UnitsUnits havehave curiecurie inventoryinventory
limitslirnits establishedestablished inin thethe PA.PA. Atry
containe$, containeN.
Any wastewaste thatftat
meetsmeets thethe wastewaste acceptanceacceptance criteriacriteria isis suitablesuitable forfor
disposaldisposal inin thethe E-AreaE-Area LLWFLLWF SlitSlit TrenchTrench
Unils. nono iotal curiecurieDisposalDisposal Units. ThereThere isis singlesingle total
RevisionRevision 1I
PagePage 33 ofof 1515
limitlimit forfor aa SlitSlit TrenchTrench DisposalDisposal Unit.Unit. TheThe curiecurie
limitlimit forfor eacheach SlitSlit TrenchTrench DisposalDisposal UnitUnit isis
specificspecific forfor eacheach radionuclideradionuclide andand isis determineddetermined
usingusing aa sum-of-fractionssum-of-fiactions techniquetechnique tolo ensureensure
eacheach radionuclideradionuclide remainsremains belowbelow thethe disposaldisposal
limitlimit establishedestablished byby thethe PAPA forfor thatthat radionuclide.radionuclide.
ClosureClosure ActivitiesActivities UnderUnder USDOEUSDOE OrderOrder 435. I435.1
InIn accordanceaccordance withwith USDOEUSDOE OrderOrder 435. I, thethe E
AreaArea LLWF is designed,designed, operatedoperated andand
435.1, E-
LLWF IS
maintainedmaintained inin aa mannermanner thatthat isis protectiveprotective ofof
humanhuman healthhealth andand thethe environment.environment. ClosureClosure ofof
thethe E-AreaE-Area LLWFLLWF underunder USDOEUSDOE OrderOrder 435.1435.1
willwill bebe conductedconducted inin threethree phases: operationaloperational
closure,closure, interiminterim closure,closure, andand finalfinal closure.closure. TheThe
E-AreaE-Area LLWFLLWF isis currentlycurrently inin thethe operationaloperational
phases;
periodperiod andand wastewaste disposaldisposal isis ongoing withwith thethe
exceptionexception ofof SlitSlit TrenchTrench DisposalDisposal UnitsUnits I,l, 2,2, 33
andand 5,5, andand thethe NavalNaval ReactorReactor ComponentsComponents AreaArea
(643-7E)(643-7E) whichwhich areare operationallyoperationally closed.closed. WhenWhen
SlitSlit TrenchTrench DisposalDisposal UnitUnit 44 reachesreaches designdesign
orgoing
capacity,capacity, it will be operationallyoperationally closedclosed
thereafter.tlereafter. The ofof operationaloperational
it will be The placementplacement
stormwater runoffrunoff coverscovers overover SlitSlit TrenchTrenchstonnwater
DisposalDisposal UnitsUnits 1I throughthrough 55 asas anan interiminterim
remedialremedial actionaction willwill occuroccur during thethe ongoingongoing Edu ng E-
AreaArea LLWF operationaloperational period.period.LLWF
OperationalOperational closureclosure willwill bebe conductedconducted duringduring anan
approximateapproximate 30-year periodperiod30-year operationoperation
(approximately(approximately 2525 yearsyears remaining)remaining) asas E-AreaE-Area
LLWFLLWF unitsunits areare frlled. OperationalOperationaldisposaldisposal filled.
closureclosure forfor thethe SlitSlit TrenchTrench DisposalDisposal Units occursoccurs
inin stages.stages. DuringDuring disposaldisposal activities,activities, trenchtrench
excavationexcavation beginsbegins atat oneone endend ofof thethe trenchtrench
Unils
ARF # 16774
ESDESD forfor Rev. llROD E-AreaE-Area Low-LevelLow-Level Waste Facility,Facility, 643-26E643-26E SRNS-RP-2009-01128Rev, I IROD Wsste sRNS-RP-2009-0r r28 (Slit(Slit TrenchTrench DisposalDisposal UnitsUnits 1I andand 2)2) (U)(U) SavannahSavannah RiverRiver SiteSite Jannary 20102010January
sectionsection andand onlyonly proceedsproceeds asas neededneeded towardtoward thethe
otherother ofof thethe trenchhench seclion orderorderendend section inin toto
minimize thethe timetime thethe trenchtrench sectionsection isis open.open.minirnize
WasteWaste placementplacement beginsbegins atat oneone endend ofof thethe trenchtrench
sectionsection andand proceedsproceeds towardtoward thethe otherother end.end. BulkBulk
wastewaste isis pushedpushed intointo thethe trenchtrench sectionsection from oneone
end.end. ContainerizedContainerized wastewaste andand largelarge equipmentequipment
areare typicallytypically placedplaced inin oneone endend ofof thethe trenchtrench
sectionsection withwith aa crane.crane. Eventually,Eventually, containerizedcontainerized
wastewaste areasareas ofof thethe trenchtrench sectionsection areare filledfilled inin
ftom
withwith eithereither bulkbulk wastewaste oror clean soilsoil toto fillfill thetheclear
voidsvoids between adjacentadjacent containers andand thethe trenchtrench
sectionsection wall.wall. EachEach sectionsection ofof aa SlitSlit TrenchTrench
DisposalDisposal UnitUnit isis typicallytypically filledfilled toto withinwithin 1.21.2 mm
behveen containors
(4(4 ft)ft) of the groundground surfacesurface withwith waste.waste.ofthe
OnceOnce aa sectionsection ofof thethe SlitSlit TrenchTrench DisposalDisposal UnitUnit
isis filledfilled withwith waste,waste, thethe cleanclean soilsoil stockpiledstockpiled
duringduring trenchtrench sectionsection constructionconstruction isis bulldozedbulldozed inin
a singlesingle liftlift overover thal sectionsection toto produceproduce aaa that
minimumminimum 1.21.2 mm (4(4 ft)ft) thickthick cleanclean soilsoil layerlayer overover
thethe wastewaste (i.e.,(i.e., operationaloperational soilsoil cover).cover). TheThe
operationaloperational soilsoil covercover isis gradedgraded toto provideprovide
positivepositive drainagedrainage offoff andand awayaway fromfrom thethe disposaldisposal
operation. SubsequentSubsequent trenchtrench sectionssections areare filledfilledopemtion.
withwith waste,waste, coveredcovered withwith anan operationaloperational soilsoil
cover,cover, andand gradedgraded toto promotepromote positivepositive drainage
untiluntil thethe entireentire trenchtrench sectionsection isis filledfilled andand
covered.covered. TheThe onlyonly mechanicalmechanical compactioncompaction thatthat
&ainage
thethe soilsoil andand wastewaste inin the trench sectionsection receivereceive isislhe trencb
from thethe hulldozer andand otherother heavyheavy equipmentequipment
movingmoving overover thethe toptop ofof aa completelycompletely backfilledbackfilled
ftom bulldozer
trench.trench.
OnceOnce aa SlitSlit TrenchTrench DisposalDisposal UnitUnit (i.e.,(i.e., setset ofof fivefive
individualindividual sectionssections inin the approximatelyapproximately 47.947.9 mm$e
RevisionRevision 11
PagePage 44 of15of 15
[157 ft] widewide byby 199.9199.9 mm [656[656 ft]long footprint)footprint)
hashas beenbeen filledfilled toto curiecurie oror volumevolume capacitycapacity limitslimits
andand completelycompletely coveredcovered withwith thethe minimumminimum 1.21.2 mm
(4(4 ft)ft) thickthick cleanclean soilsoil covercover (i.e.,(i.e., operationaloperational soilsoil
cover),cover), itit willwill bebe coveredcovered byby variablevariable thicknessthickness
[ 5? 11] ft] long
gradinggrading fill,fill, thenthen 15.2 cmcm (6-in)(6-in) ofof structuralstructural soilsoil
frll, byby the installationinstallation thethe
l5-2
fill, followedfollowed the ofof
operationaloperational stormwaterstormwater runoffrunoff cover.cover.
TheThe interiminterim closureclosure phasephase forfor thethe entireentire E-AreaE-Area
LLWFLLWF beginsbegins afterafter allall disposaldisposal operationsoperations inin thethe
E-AreaE-Area LLWFLLWF havehave ceasedceased andand allall disposaldisposal unitsurits
are operationally closed.closed. An interiminterim lowloware opemtionally An maintenancemaintenance covercover willwill bebe installedinstalled overover allall E
AreaArea LLWFLLWF disposaldisposal unitsunits andand maintainedmaintained
E
duringduring thethe IOO-year institutionalinstitutional control periodperiod100-year conftol
(i.e.,(i.e., interiminterim closure).closure). TheThe IOO-year institutionalinstitutional100-year
controlcontrol periodperiod isis anan estimatedestimated timeframetimeframe forfor
metalmetal containercontainer corrosioncorrosion andand subsequentsubsequent
strength lossloss ofof thethe containerscontainers toto reducereduce voidvoid
spacesspaces andand enhanceenhance compactioncompaction duringduring
subsidencesubsidence txeatment. treatmenttreatment
shength
treatment. SubsidenceSubsidence
consistingconsisting ofof staticstatic surchargingsurcharging and/orand/or dynamicdynamic
compactioncompaction willwill bebe performedperformed atat thethe endend ofof thethe
IOO-year100-year institutionalinstitutional controlcontrol period.period. FinalFinal
sntire LLWFclosureclosure forfor thethe entire E-AreaE-Area LLWF willwill consistconsist
of the installationinstallation of an integratedintegrated closureclosure systemsystemofthe ofan
designeddesigned toto minimizeminimize moisturemoisture contactcontact withwith the
wastewaste andand toto provideprovide anan inlruder
tlte
intruder deterrent.deterrent. TheThe
finalfinal integratedintegrated closureclosure systemsystem willwill consistconsist ofof
oneone oror moremore closureclosure capscaps installedinstalled overover allall thethe E
LLWF aa
E-
AreaArea LLWF disposaldisposal unitsunits andand willwill includeinclude
newnew integrated drainagedrainage system.system.i[tegrated
TheThe interiminterim acilon remedyremedy requiresrequiresselectedselected action
constructionconstruction ofof thethe operationaloperational stormwaterstormwater runoffrunoff
ARF # 16774
ESDESD forfor Rev.Rev. IIROD E-AreaE-Area Low-LevelLow-Level WasteWaste Facility,Facility, 643-26E643-26E sRNS-RP-2009-01128I IROD SRNS-RP-2009-01128 (Slit(Slit TrenchTrench DisposalDisposal UnitsUnits II andand 2)2) (U)(U) SavannahSavannah RiverRiver SiteSite January 20102010Januarv
coverscovers andand involvesinvolves thethe placementplacement ofof gradinggrading fillfill
andand structural fillfill overover thethe operationaloperational soilsoil cover,cover,
whichwhich willwill bebe gradedgraded toto promotepromote eveneven greatergreater
drainagedrainage offoff thethe trenches.trenches. TheThe runoffrunoff covercover
barrierbarrier willwill consistconsist ofof aa low-permeability,low-permeability, 3030 milmil
(minimum(minimum thickness),thickness), EIAEIA linerliner cap.cap. SlopingSloping
structwal
underunder andand aroundaround thethe covercover materialmaterial willwill bebe
adequateadequate toto ensureensure covercover stabilitystability andand promotepromote
positivepositive drainage.drainage. AA soilsoil layerlayer willwill notnot bebe
installedinstalled oyer willwillover thethe linerliner capcap material;material; thisthis
allowallow forfor visualvisual inspectioninspection duringduring bothboth thethe
constructionconstruction andand operational period.period. TheThe exposedexposedopemtional
EJA linerliner capcap willwill allowallow forfor easiereasier andand fasterfaster
detectiondetection ofof damagedamage toto thethe covercover systemsystem andand
allowallow for visualvisual detectiondetection ofof
EIA
for immediateimmediate
inefficientinefficient drainagedrainage (e.g.,(e.g., standingstanding water).water). TheThe
stormwaterstormwater runoffrunoff covercover willwill bebe protectedprotected from
equipmentequipment andand vehiclevehicle traffictraffic asas wastewaste disposaldisposal
operationsoperations continuecontinue inin thethe E-AreaE-Area LLWF.
Aom
LLWF.
Warning barricades,barricades, includingincluding signsign postingspostings andand
chains,chains, willwill bebe installedinstalled aroundaround thethe covercd
Waming
covered
areas.a.reas.
TheThe current landlandcurent useuse forfor thethe E-AreaE-Area LLWFLLWF isis
industrialindustrial withwith USDOEUSDOE maintainingmaintaining controlcontrol ofof
thethe land.land. TheThe E-AreaE-Area LLWFLLWF isis currently inin thethe
operationaloperational phasephase andand accessaccess isis controlledcontrolled byby
SRSSRS facilityfacility securitysecurity andand administrativeadministrative controls.controls.
cunently
AdditionalAdditional controls areare notnot partpart ofof thisthis interiminterim
remedialremedial action.action. AA finalfinal remedialremedial actionaction willwill bebe
evaluatedevaluated andand conductedconducted inin thethe futurefutw€ forfor thethe
entireentire E-AreaE-Area LLWFLLWF accordingaccording toto thethe
requirementsrequirements ofof thethe FFA.FFA. TheThe LandLand UseUse ControlControl
ImplementationImplementation PlanPlan willwill bebe deferreddeferred untiluntil finalfinal
contsols
closureclosure ofthe entireentire E-AreaE-Area LLWF.LLWF.of the
RevisionRevision 1l
PagePage 55 ofl5of 15
III.III. BasisBasis forfor thethe ExplanationExplanation ofof SignificantSignificant DifferenceDifference
TheThe purposepurpose ofof thisthis ESDESD isis toto documenl aa post
IRODIROD changechange by TrenchTrench
document post
by incorporatingincorporating SlitSlit
DisposalDisposal UnitsUnits 3,3, 4,4, andand 55 intointo thethe selectedselected
interiminterim remedialremedial actionaction forfor SlitSlit TrenchTrench DisposalDisposal
UnitsUnits 1 andand 22 toto installinstall stonnwater runoffrunoff coverscovers
asas thethe disposaldisposal unitsunits reachreach designdesign capacity.capacity.
I stormwater
SlitSlit TrenchTrench DisposalDisposal UnitUnit 33 hashas beenbeen filledfilled withwith
mr (59s,690 fd)aa disposaldisposal volumevolume ofof 16,95316,953 m' (598,690 ft') andand
totaltotal inventoryinventory ofof 125125 curies.curies. SlitSlit TrenchTrench
DisposalDisposal UnitUnil 44 hashas anan estimatedestimated disposaldisposal
volumevolume ft')ofof 19,25019,250 m'm3 (679,807(679,807 ftr) withwith anan
estimatedestimated totaltotal ofof IOO curies.curies. TheThe volumevolume andand100
curie inventoryinventory forfor SlitSlit TrenchTrench DisposalDisposal UnitUnit 44 isis
anan estimatedestimated valuevalue becausebecause thisthis disposaldisposal unitunit isis
cude
currently beingbeing filled andand willwill bebe operationallyoperationally
closedclosed priorprior toto installationinstallation tbe
curently hlled
ofof the stormwaterstormwater
runoffrunoff covers.covers. SlitSlit TrenchTrench DisposalDisposal UnitUnit 55 hashas
reachedreached aa totaltotal disposaldisposal volumevolume ofof 28,12528,125 m'mr
(993,225(993,225 if) andand aa totaltotal inventoryinventory ofof 1.27E+05ff) 1.2?E+05
curiescuries andand isis operationallyoperationally closed.closed.
TheThe curiecurie limitlimit forfor each Slit TrenchTrench DisposalDisposal
UnitUnit isis specificspecific forfor eacheach radionuclideradionuclide andand isis
eacb SIit
determineddetermined usingusing a sum-of-fractions techniquetechnique
priorprior toto disposaldisposal toto ensureensure eacheach radionuclideradionuclide
remainsremains belowbelow thethe disposaldisposal limitlimit establishedestablished byby
thethe PAPA forfor thatthat radionuclide.radionuclide. WhenWhen aa SlitSlit TrenchTrench
DisposalDisposal unitunit hashas reachedreached thethe curiecurie disposaldisposal limitlimit
establishedestablished byby thethe PA,PA, thethe trenchtrench isis filledfilled toto thethe
a sum-of-ffactions
yolumevolume capacitycapacity withwith cleanclean soil.soil. Therefore,Therefore, thethe
finalfinal curiecurie inventoryinventory forfor SlitSlit TrenchTrench DisposalDisposal
UnitUnit 44 willwill bebe atat oror belowbelow thethe disposaldisposal limitslimits
establishedestablished bybv thethe PAPA atat operationalooemtional closure,closure.
ARF # 16774
ESDESD forfor Rev.Rev. II IRODIROD E-Area Low-Level WasteWaste Facility,Facility, 643-26E643-26E SRNS-RP-2009-01128E-Ar€a Low-L€vel sRNS-RP-2009-0112E (Slit(Slit TrenchTrench DisposalDisposal UnitsUnits II andand 2)2) (U)(U) SavannahSavannah RiverRiver SiteSite JanuaryJanuary 20102010
FinalFinal volumevolume andand curiecurie valuesvalues forfor SlitSlit TrenchTrench
DisposalDisposal UnitUnit 44 willwill bebe publishedpublished inin thethe IRAIPIRAIP
oror thethe InterimInterim PostPost Construction Report.Report.Conshuction
DescriptionDescription ofof Significant DifferencesDifferences
IV.IV. Signilicant
TheThe interiminterim remedialremedial actionaction toto installinstall operationaloperational
stormwaterstormwater runoffrunoff coverscovers overover SlitSlit TrenchTrench
DisposalDisposal UnitsUnits II andand 22 waswas documented inin thethe
approvedapproved IROD andand doesdoes notnot
documetrted
lROD (SRNS(SRNS 2009b)2009b)
changechange withwith thisthis ESD. TheThe significantsignificant
differencesdifferences areare thatthat SlitSlit TrenchTrench DisposalDisposal UnitsUnits 3,3,
ESD.
4, andand 5 at the E-AreaE-Area LLWFLLWF areare nownow
incorporatedincorporated intointo thethe samesame interiminterim remedialremedial
actionaction selectedselected forfor SlitSlit TrenchTrench DisposalDisposal UnitsUnits II
4, 5 at thc
and 2.and2.
FigureFigure 33 illustratesillustrates thethe conceptualconceptual stormwatersiormwater
runoffrunoff covercover designdesign forfor SlitSlit TrenchTrench DisposalDisposal
UnitsUnits II throughthrough 5.5. ConstructionConstruction ofof thethe
stormwateroperationaloperational stonnwater runoffrunoff coverscovers willwill
involveinvolve thethe placementplacement ofof gradinggrading fillfill andand
structuralstructural fillfill overover thethe operationaloperational soilsoil cover,cover,
whichwhich willwill bebe gradedgraded toto promotepromote eveneven greatergreater
drainagedrainage offoff thethe trenches.trenches. TheThe runoffrunoff covercover willwill
consistconsist ofof aa low-permeability,low-permeability, 3030 milmil (minimum(minimum
EIA SlopingSloping underunder andandthickness),thickness), ElA capcap liner.liner.
around thethe materialmaterial willwill bebe adequateadequate
ensureensure covercover stabilitystability andand promotepromote positivepositive
drainage.drainage. AA soilsoil layerlayer willwill notnot bebe installedinstalled overover
banier covercover thisthis willwill allowallow forfor
aror.rnd covercover toto
thethe barrier material;material;
visualvisual inspectioninspection duringduring bothboth thethe constructionconstruction
andand opemtional TheThe exposedexposedoperational period.period.
geomembranegeomembrane linerliner willwill allowallow forfor easiereasier andand
fasterfaster detectiondetection ofof damagedamage toto thethe covercover systemsystem
andand allowallow forfor immediateimmediate visualvisual detectiondetection ofof
RevisionRevision 1I
PagePage 66 ofl5of 15
inefficientinefficient drainagedrainage (e.g.,(e.g., standingstanding water).water). TheThe
stormwaterstormwater runoffrunoff covercover willwill bebe protectedprotected from
equipmentequipment andand vehiclevehicle traffictraffic asas wastewaste disposaldisposal
operationsoperations continuecontinue inin thethe E-AreaE-Area LLWF.LLWF.
WarningWarning barricades,barricades, includingincluding signsign postingspostings andand
chains,chains, willwill bebe installedinstalled aroundaround thethe cov€red
fiom
covered
areas.arcas.
TheThe presentpresent valuevalue (PV)(PV) costcost estimateestimate forfor
implementingimplementing thethe interiminterim remedialremedial actionaction (i.e.,(i.e.,
install operationaloperational stormwaterstormwater runoffrunoff coverscovers withwith
lowlow permeability,permeability, 3030 milmil (minimum(minimum thickness),thickness),
irstall
EIAEIA linerliner cap)cap) forfor thethe E·Area LLWF SlitSlit TrenchTrench
DisposalDisposal UnitsUnits II throughthrough 55 isis presentedpresented inin thethe
E-Area LLWF
tabletable below.below. SinceSince SlitSlit Trenches DisposalDisposal UnitsUnitsTr€nches
I, 2, 3,3, andand 44 willwill bebe underunder aa singlesingle covercover andand
SlitSlit TrenchTrench DisposalDisposal UnitUnit 55 willwill bebe underunder aa
separateseparate cover,cover, aa comprehensivecomprehensive PV costcost
1,2,
PV
estimateestimate forfor SlitSlit TrenchTrench DisposalDisposal UnitsUnits II throughthrough
55 isis includedincluded asas TableTable II andand modifiesmodifies thethe PVPV costcost
IROD. TheThe estimateestimate includesincludesestimateestimate inin thethe lROD.
directdirect andand indirectindirect capitalcapital costs,costs, andand directdirect andand
indirectindirect operationoperation andand maintenance (O&M)(O&M) costscosts
whichwhich includeinclude annualannual andand periodicperiodic maintenancemaintenance
activities.activities.
maintenatrce
TheThe projectproject durationduration ofof 2525 yearsyears usedused inin thethe costcost
estimateestimate isis basedbased onon thethe estimatedestimated serviceservice lifelife ofof
thethe stormwaterstormwater runoffrunoff covercover andand forfor thethe timetime
requiredrequired toto maintain itsits effectivenesseffectiveness includingincludingmainlain
accessaccess controls, annualannual inspection,inspection, repairrepair ofof thethe
covercover arrd
confols,
systemsystem (if(if needed),needed), and 55 yearyear remedyremedy
reviews.revlews.
ARF # 16774
ESDESD forfor Rev.Rev. II IRODIROD E-AreaE-Area Low-Level WasteWaste Facility,Facility, 643-26E643-26E sRNS-RP-z009-01l2El,ow-Level SRNS-RP-2009-01128 (Slit(Slit TrenchTrench DisposalDisposal UnitsUnits II andand 2)2) (U)(U) SavannahSavannah RiverRiver SiteSite JanuaryJanuary 20102010
TheThe interiminterim remedialremedial actionaction scheduleschedule forfor thethe E-E-
AreaArea LLWF SlitSlit TrenchTrench DisposalDisposal UnitsUnits II thoughthough
55 isis providedprovided inin FigureFigure 4.4.
LLWF
PresentPresent Value Cost Estimate toto ImplementImplementValu€ Coit Estimat€ Interim ActionAction RemedyRemedyInt€rim
PV O&M Costs @ 2.1Vo Discount
Estimated Time to 13 monthsImplement
Project Duration 25 years
V. Statutory DeterminationsV. StatutoryDeterminations
TheThe samesame interiminterim actionaction remedyremedy selectedselected forfor SlitSlit
TrenchTrench DisposalDisposal UnitsUnits II and 22 isis appliedapplied toto SlitSlit
TrenchTrench DisposalDisposal UnitsUnits 3,3,4,4, andand 55 asas anan
ard
enhancementenhancement to -the current protective measuresmeasures
requiredrequired byby USDOEUSDOE OrderOrder 435.1.435.1. USDOEUSDOE hashas
agreedagreed toto installinstall andand maintainmaintain operationaloperational
stormwaterstomwater runoffrunoff coverscovers for SlitSlit
to re curent protectrve
for TrenchTrench
DisposalDisposal UnitsUnits II through 55 duringduring thethe remainderremainder
ofof thethe E-AreaE-Area LLWFLLWF operationaloperational periodperiod asas anan
interiminterim remedialremedial actionaction toto furtherfurther reducereduce
tbrough
stonnwater infiltration.stormwater infi ltration.
TheThe additionaddition ofof SlitSlit TrenchesTrenches DisposalDisposal UnitsUnits 3,3,
4,4, andand 55 toto thethe interiminterim remedialremedial actionaction enhancesenhances
protectionprotection ofof humanhuman healthhealth andand thethe environment,environment,
compliescomplies withwith FederalFederal andand StateState requirementsrequirements
thatthat areare legallylegally applicableapplicable oror relevantrelevant andand
appropriateappropriate toto thethe limited-scopelimited-scope interiminterim remedialremedial
actionaction (unless(unless justifiedjustified byby aa waiver),waiver), andand isis cost
effective.effective. ThisThis actionaction isis interiminterim andand isis notnot
cost-
RevisionRevision II
PagePage 77 ofl5of 15
int€nded toto permanentpermanent solutionssolutions andandintended utilizeutilize
alternativealternative treatmenttreatment (or(or resourceresource recovery)recovery)
technologiestechnologies toto thethe maximummaximum extentextent practicablepracticable
forfor thethe E-AreaE-Area LLWFLLWF (Slit(Slit TrenchTrench DisposalDisposal
UnitsUnits II throughthrough 5).5). BecauseBecause thethe ESDESD doesdoes notnot
fundamentally changechange thethe interiminterim remedy,remedy, thethe
ApplicableApplicable oror RelevantRelevant andand AppropriateAppropriate
RequirementsRequirements discussiondiscussion presentedpresented inin thethe IRODIROD
isis notnot reevaluatedreevaluated inin thisthis ESD.ESD. ThisThis interiminterim
remedialremedial actionaction doesdoes notnot constituteconstitute - thethe finalfinal
l ndamentally
remedyremedy forfor thethe E-AreaE-Area LLWF andand thethe statutorystatutory
preferencepreference forfor remediesremedies thatthat employemploy heatment
LLWF
treatment
thatthat reducesreduces toxicity,toxicity, mobility.mobility, oror volumevolume asas aa
principalprincipal elementelement willwill bebe addressedaddressed byby thethe finalfinal
responseresponse action.action. AA finalfinal remedialremedial actionaction willwill bebe
evaluatedevaluated andand conductedconducted inin thethe future forfor thethe
entireentire E-AreaE-Area LLWFLLWF accordingaccording toto thethe
requirementsrequirements ofof thethe FFA.FFA.
fuhrre
AlthoughAlthough thethe interiminterim remedialremedial actionactiotr willwill
cunentenhanceenhance current protectiveprotective measures,measures, hazardoushazardous
substances,substances, pollutants,pollutants, oror contaminantscontaminants willwill stillstill
remainremain on-siteon-site aboveabove levelslevels thatthat allowallow forfor
unlimitedunlimited use andand unrestrictedunrestricted exposure.exposure.use
Therefore,Therefore, aa statutorystatutory reviewreview willwill he conductedconductedbe
withinwithin fivefive yearsyears afterafter initiationinitiation ofof thethe interiminlerim
remedialremedial actionaction toto ensure that thethe remedyremedy isis andandensue lhat
prctectivewillwill continuecontinue toto bebe protective ofof humanhuman healthhealth
andand thethe environment.environment.
Public ParticipationVI.VI. PublicParticipation
TheThe publicpublic willwill bebe informedinformed ofof thethe changeschanges toto thethe
selectedselected interiminterim remedyremedy asas specifiedspecified inin thisthis ESDESD
throughthrough thethe SRSSRS EnvironmentalEnvironmental Bulletin,Bullelin, aa
newsletternewsletter sentsent toto approximatelyapproximately 3,5003,500 citizenscitizens
inin SouthSouth CarolinaCarolina andand Georgia,Georgia, and throughthrough thetheard
ARF # 16774
ESDESD forfor Rev.Rev. 1 IRODIROD E-AreaE-Area Low-LevelLow-Level WasteWaste Facility,Facility, 643-26E643-26E sRNS-RP-2009{l128I SRNS-RP-2009-01128 (Slit(Slit TrenchTrench DisposalDisposal UnitsUnits 11 andand 2)2) (U)(U) SavannahSavannah RiverRiver SiteSite .IenrrervJanuary 20102010
AikenAiken Standard,Standard, thethe AllendaleAllendale Citizen Leader,Leader,Cilizen
thethe BarnwellBarnwell PeoplePeople Sentinel,Sentinel, TheThe State,State, and thethealrtd
Augusta Chronicle newspapers.Au gus ta Chr onic le tewspapers.
ToTo morc infonnationinformation conceming thisthisobtainobtain more concemmg
ESD,ESD. contact:contact:
PaulPaul SauerbomSauerbom SavannahSavannah RiverRiver NuclearNuclear Solutions,Solutions, LLCLLC PublicPublic Involvement SavannahSavannah RiverRiver SiteSite BuildingBuilding 730-lB730-lB Aiken,Aiken, SouthSouth CarolinaCarolina 2980829808
Involvernent
1-803-952-6658l-803-952-6658 paul.sauerbomCiVsrs.govpaul . sauerbom(rlsrs. qov
VII.VII. ReferencesReferences
FFAFFA 1993.1993. FederalFederal FacilityFacility AgreementAgreement forfor thethe
SavannahSavannah RiverRiver Site,Site, AdministrativeAdministrative DocketDocket No.No.
89-05-FF89-05-FF (Effective(Effective Date:Date: AugustAugust 16,16, 1993)1993)
WSRCWSRC 2008.2008. Wqste F.tcilityE-AreaE-Area Low-LevelLow-Level Waste Facility
USDOEUSDOE 435.1435.1 PerformancePerformance Assessment, Rev. 0,0,
WSRC-STl-2007-00306,wsRC-sTI-2007-00306, Westinghousc
Assessmen| R..ev.
Westinghouse
SavannahSavannah RiverRiver Company,Company, SavannahSavannah RiverRiver Site,Site,
(Marcb)Aiken,Aiken, SCSC (March)
SRNSSRNS 2009a.2009a. PI.tnInterimInterim ActionAction ProposedProposed Plan forfor
thethe E-AreaE-Area Low-LevelLow-Level WasteWaste Facility,Facility, 643-26E643-26E
(SIit TrenchTrench DisposalDisposal UnitsUnits I (U),(U),(Slit 1 andand 2)2) RevisionRevision 1,1, SRNS-RP-2008-01308,SRNS-RP-2008-01308, SavannahSavannah
RiverRiver NuclearNuclear Solutions,Solutions, LLC,LLC, SavannahSavannah RiverRiver
Site,Site, Aiken,Aiken, SCSC (April)(April)
SRNSSRNS 2009b.2009b. InterimInterim RecordRecord ofofDecisionDecision forfor thethe
E-AreaE-Area Low-LevelLow-Level WasteWaste Facility, 643-26E (Slit(SlitFaciliry, 643-268
I (UJ,TrenchTrench DisposalDisposal UnitsUnits 1 andand 2)2) (U), RevisionRevision 1,l, SRNS-RP-2009-00538,SRNS-RP-2009-00538, Savannah RiverRiver NuclearNuclearSavamah
RevisionRevision 11
Pqoo R nf l{Page 8 of 15
Solutions,Solutions, LLC,LLC, SavannahSavannah RiverRiver Site,Site, Aiken,Aiken, SCSC
(November)(November)
"
IESDESD forfor Rev.Rev. I IRODIROD E-AreaE-Area Low-LevelLow-Level WasteWaste Facility,Facility, 643-26E643-26E sRNS-RP-2009-0r r28SRNS-RP-2009-01128 (Slit(Slit TrenchTrench DisposalDisposal UnitsUnits II andand 2)2) (U)(U) IRevisionRevision 1 SavannahSavannah RiverRiver SiteSite JanuaryJanuary 20102010 of 15PagePage 99 ofl5
ARF # 16774
,\(
ri /\
LegEndLegend
- SlreamPerennialPerennial Stream
BW- Boundary,Boundary, SRSSRS FacilityFadlity AreeArea
- BoundaryBoundary, SRSSRS FacilityFacility LineLine q-LLWF Low L€v€l WaslellWF == low Level Waste FacilityFacility MWMFMWMF == MixedMixed WasteW6ls
Managsm€nt FacilityManagement Fac~ily = Radioaclive \'!bsleORWBGORWBG =OldOld Radioactive Waste
EuialGroundBurial Ground
0 500500 1,0001,000 Meters NNMeleE 1,"eI,,,.!Lr-r-r-!r-r-r-! A lillIllIlIlr-rr-rrT'r'r'r-n I0 1,5001.500 3 000 Fer to 3,000 Feet
HArea
FigureFigure 1.1. LLWFLocationLocation ofof thethe E-AreaE-Area LLWF withinwithin thethe GeneralGeneral SeparationsSeparations AreaArea atat thethe SavannahSavannah RiverRiver SiteSite
'.
ESD Rev. I E-Area Low-Level Facility, 643-26E[SO forfor Rev, 1 IRODIROD [·Area Low·Level WasteWaste Facility, 643·26E SRNS-RP-2009-01r 2ESRNS·RP·2009·01128 (Slit Units I(Slit TrenchTrench DisposalDisposal Units 1 andand 2)2) (U)(U) IRevisionRevision t SavannahSavannah RiverRiver SiteSite JanuarvJanuary 20102010 l0PagePage 10 ofof 1515
ARF # 16774
Sf a
c:;:::::::J ,LV
legendLrgud
D Elisting Disposal AreasE Erirthg Urtor.l Ar€.t ~ -.\NND Future Disponl Areasn Frbrc 0lrtord Ara|' ~
Di I E-AreaE{rt. 100-acrel0o-ecr LcrLow Levell.r.l f.rt.WilSie F.rtIttFacility (llWF)(!tff}.
N6te for Er6nn9 06po.al Ares:Not" fOf" ExlSl lng Oif.pouJ Ateas: STST git lrend€s= Slit Trenches=
(ompon€ntsrn4mulClG :;; Com~nts-lll-Grnut Tren:nest16 = Trerf,il€s
ETET :;; Engineered Trerv:hes= Engineered T.effhes LAW :;; Low ActMty WasteWaste Vat,jtLAw L,r* Acivny Vault=
- Inlermedinte VauhILVILV ;; Intermediate LevelLevel Vauh (/NRCOA :;; Naval Reacl()( Compooenl OIsposaI Area (64 3-26f: andand 64 3-7E)NRCDA = Ilav.l tuac1or Componenl Dispo5alArea (643 26E 6aj-7El 643-7£<,\
NR(DA V0 100l0O lOO Meters 0 250 i..r..,o O r.br' o 25O 500500 F
, I , , II,tJ-J-J-!t--!-- i l",,lrr,rl
FigureFigure 2,2. oftheLocationLocation of the SlitSlit TrenchTrench DisposalDisposal UnitsUnits FootprintFootprint withinwithin thethe E-AreaE-Area LLWFLLWF
oo
UF q)
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(9
ro q)
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ESO for Rev. I IROO E-Area Low-Level Waste Facility, 643-26E (Slit Trench OisposallJnits I and 2) (lJ) Savannah River Site
SRNS-RP-2009-0 112M Revision I
ARF # 16774
January 2010
Geosynthetlc Cover
Figure 3.
Concrete Drainage Channel
w •• t. In Individual Disposal Sections
4' Minimum Clean Backfill Over WIlSie
(OperatiDnal 5Dil Cover)
Cf09&-SecllOfI Represents Slit Trench Disposfi Unit !5
,!", .,:.~ tor ~!t;t(!l'lfl! l~". UnA~. 1.·-.:c:;cn!~f!llt q<lI~
Operational Stormwater Runoff Conceptual Design
···········t· Surfllce
Concrete Anchor
Page II of 15
ARF # 16774
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1 Facitity, SRNS-RP-2009-0 1128ESDESD forfor Rev.Rev. I IRODIROD E-AreaE-Area Low-LevelLow-Level WasteWaste Facility, 643-26E643-26E sRNS-RP-2009-01128 Units (U) RevisionRevision II(Slit(Slit TrenchTrench DisposalDisposal Units II andand 2)2) (U)
SavannahSavannah RiverRiver SiteSite January 2010 PagePage. 1414 ofof 1515January 2010
TableTable 1.1. PresentPresent ValueValue CostCost Estimate forfor SlitSlit TrenchTrench DisposalDisposal UnitsUnits 1I throughthroughEstirnate 55 withwith EIAEIA LinerLiner CapCap
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Trench Drr;posal UnitsUnits ' ·5 ElA.D Mil Unef Cap Layout SUrfSrL.youl Sunst 11 li l1/,m0 00
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',Em 'r 57 .00ElcwateEtcrvats slitslil t rench overburden and move toto next trenchtEnch oveburden ard mow nsn tEnch 6 m0 cy $7 00 6 800 i1 rl0CompactCompacl bilckfillbacklillonon trenchlrsnch ',Em 'rcy SUll
Ercdatg backlil at Sit€ botrowph 5800 'r 120052110E'lC~1 9 bilckfill ill Site borrow pi! 35,Em cy Haul bilckfill to Slit Trenches 42)l6O cI 51300Hrul backrillo Slil Tronchls i2 960 i13 00'r PlacePlace backfill at Slit Trenches 35,Em crbacklill .l Slrl Tfenches l5 800 $300S3 00'r Comp act backfill on Silt Trenches ",Em ct Eicklill conslituenmftsatu densiy teslrng 15 et 1250.00Sl50ll0 t18, Comp.cl bacKillon Slt Trench.s 35 800 'r SI$1 .oo00 Backfill constituentlir.-situ densny Is Sling 75 Excavat, coac.ete channel (spoilwill osed for slomwaler codrol) 8.075I075 'rcy 12 00ElCOIVate concre1e cllannel (spoil \lilil bebe used ror stormwater conlroQ " $? rl0
750 li1l0l0Concrete channelConcEl. chaniol Oabor(laboi,, equipmentpquipmeir andand matenaQmateial) 750 cy 1200 00'r E.cavate conCr818linerErcdate coicele liier 375 cr 1200t2 !037' 'r,,,Concrete liner anchorage Oabor, equipment :ilnd malerial) $2!0 00concrele lrner.nchoEge (labor, equpmenr aid nareiar) 315 .' 1200 00'r Geolex\rle fabriC, now woven , t((llb tenSile slrength (matenaQ Dl,(Dl 1015Georertile labric, now*Nn. 1mb rens,l. e,enlih Lm.lefaD 3:0 000 'fsf l0 15 EIAEIA 3J30 milliner -milliner- chemicalchemrcalreslslaitresistant (labor, equlpmlmt and material )(hbor equpmeil aid male,al) '<lJ1XXl sf 11 50 E)(istlng mOlnitonng weilimer penetrationsExisnig moinilonng*ell|lner penelBtions Oabor(labor,, equipment and mateequrpnenl.nd m.leno)nal) 45 " $250 00
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ea 1250 00 SloflTlWater contrSto rmwater .orlrolol 22 " lt ll5lno !!" 515,C01OO Con.E1..1066 ng over conrreie at roadway 22 Jt S5,m0 mConcrete crossmg slabslab over concrele channelchannel alroadway " 15,00100 Institutional Conl rols " Posting ofWarnmg Signs ,Posrinq ofwarning Signs F ea 15,m0 !0"1XXl00 Land UseUse Conhol lmplementallOn PlanLlnd Conlrol lmplem€ntation Pl.n 1 " ea $5.m0 00"1XXl00 DeedDeed Restricti(lnsResl ctions 1 " ea S5,|n0ll0"1XXl00 Lysimetels remLysim8t.G EmdallNal andand modifications 1 " 175,m0 mmodifcrlions l! $75,00100"
Sublotal, Diract Capital Cost MoblillMobrl,ralEMechncalrequremedtdemobilzslionatloMechnlcal rE'qullementsldemobllizatlon r:%DiEclCosts
Suhoi.l- Dnecl Capnal Cost 13% Duect Costs
SlIe preparation/slIE' restorationSd€ prepantmn/site rcslolaiion Drrcct Cosls9%9% DlIect Costs
TOMI Oh ed C.lllit.ll CostTohl Dir.d C.pit.l Cot|
14% of dlfec1 cost
ProJecuconstrucnon msiegemeni 25% of direc1 cos t Engineedrg & De.rgn r.4% ordrecr .ost
5% ofdirecr cosr Health & Satu1y ofdtrecl cost6%6% of dlleC1 cost
3:1% of direct costOve'head :U9o otdire.l cost 20% of direct costContingsnct :09. otdir€cl cost
Subto1.ll lndi l ed C.1Vital CoslStrl,rol.l I'xlir.cr Cnpirnl (05.
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I years O&ilyears O&M I CostsCosts (Existing system during Post-ROD Oeslgn&Construction)(Er sling sydEm dudng Fost-RO0 D€siqn&Cohstructi0n)
Access ControlsAcc€ss Cdrnrdls .. :500 m"'" 00Present Value 09%Pressrn Valle 0 9'l. 11 year~teaa
yeais Accsss conrrols r S:oJ_OO
Annual CosAnnusl Coslsts 2525 years Access Controls ea S5co m Annual Insp€clions I ea $5,m0 mAnnuallnspecti(lns " S5 ,[llJ,OO Annual Lmer RepairsAnnu al L'ier Repai6 1 " t10,m0.mea $1" Subtotal Annual CostsSublotalA.nua Cosis
Present ValuePr€senl Valle 270/. 25 yeafs~279r X teats'
fIVe Year Costs
Renedt Rdew 5 1,5 yeaE Sl115S,(IDCIJEEO E0Remedy Rl!Vlew , t/5 years Subtotal Annual Costs
Plesent VaPrer€nl Valuelue 27% 25 years~ SubtotalAinuslCosts
: l% :5 tearE' Pr.s.nl V.hr. ofDir..t Ot|{ Co.lPr esem V.llu e of Oir ed 0&'" Cost
Inlth ect D&M Costs ProjectfAdmtn , Management r00%100%
Salely 53"539iHealth && Sarety Overhead :0% Contingency "'''15%15%
ToMI Pl e selll Vollue Indil ect O& M COSTToral Pr...nr V.lu. lndlr e.t Otll Co.r
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ESDESD forfor Rev.Rev. II !ROD E-AreaE-Area Low-LevelLow-Level WasteWaste Facility,Facility, 643-26E643-26E SRNS-RP-2009-01128 (Slit(Slit TrenchTrench DisposalDisposal UnitsUnits I1 andand 2)2) (U)(U) RevisionRevision II SavannahSavannah RiverRiver SiteSite January 2010 PagePage IS ofof IS
IROD sRNS-RP-2009-01128
.Ianuary 2010 15 15
z/zr/ro Date
46~A~ h ) Ctrfh/Karen C. Guevara Assistant ManagerManager forfor ClosureClosure ProjectProjectAssistant U.U. S.S. DepartmentDepartment ofof EnergyEnergy SavannahSavannah RiverRiver Operations OfficeOfficeOoerations
DirectorSuperfund DivisionDirector Superfund Division U.U. S.S. EnvironmentalEnvironmental ProtectionProtection AgencyAgency -- RegionRegion 44
Date BureauBureau ChiefChief BureauBureau ofof LandLand andand WasteWaste ManagementManagement SouthSouth CarolinaCarolina Depaltment ofof HealthHealth andand EnvironmentalEnvironmental ControlControlDeDartment