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

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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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SavannahSavannah RiverRiver SiteSite January 2010 PagePage. 1414 ofof 1515January 2010

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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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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

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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