# FINAL CLOSE-OUT

REPORT MIDVALE

SLAG SUPERFUND

SITE MIDVALE,

UTAH Prepared

by U.S. Environmental

Protection

Agency,

Region

8 1595 Wynkoop Denver,

CO 80202-1129 September

2014TableofContents1.0INTRODUCTION................................................................................................................32.0SUMMARYOFSITECONDITIONS...............................................................................32.1SiteBackground.............................................................................................................32.2InitialResponse..............................................................................................................42.3RemovalActions............................................................................................................42.4RemedialInvestigation/FeasibilityStudies....................................................................42.5RecordofDecision.........................................................................................................52.5.1OperableUnit1..................................................................................................52.5.2OperableUnit2..................................................................................................62.6RemedialActivities........................................................................................................72.6.1OperableUnit1..................................................................................................72.6.2OperableUnit2..................................................................................................82.6.3OperableUnits1and2.......................................................................................82.7InstitutionalControls......................................................................................................93.0GROUNDWATERMONITORINGRESULTS...............................................................94.0REUSE/REDEVELOPMENT..........................................................................................105.0OPERATIONANDMAINTAINENCE...........................................................................106.0DEMONSTRATIONOFCLEANUPACTIVITYQUALITYASSURANCE/QUALITYCONTROL.............................................................................117.0FIVE-YEARREVIEWS......................................•.............................................................118.0SITECOMPLETIONCRITERIA...................................................................................11BIBLIOGRAPHY.....................................................................................................................Bl1.0INTRODUCTIONThisFinalCloseOutReportdocumentsthattheU.S.EnvironmentalProtectionAgency(EPA)hasdeterminedinaccordancewithCloseOutProceduresforNationalPrioritiesListSites(OSWERDirective9320.2-22,May2011)thatallappropriateresponseactionsattheMidvaleSlagSuperfundSite(UTD08134277)(Site)havebeensuccessfullyimplementedbytheEPAandtheUtahDepartmentofEnvironmentalQuality(UDEQ)inaccordancewiththeRecordsofDecision(RODs)andExplanationsofSignificantDifferences(ESDs)issuedforSite.2.0SUMMARYOFSITECONDITIONS2.1SiteBackgroundThe446-acreMidvaleSlagSuperfundSiteislocated12milessouthofSaltLakeCityinthecityofMidvale,withasmallportionextendingintotheadjacentcityofMurray.TheSiteisdividedintotwooperableunits.MidvaleSlagOperableUnit1(OU1)encompassesapproximately266acresinthenorthernportionoftheSite,andprimarilyconsistedofbufferlandwhereminimalsmelteroperationsoccurred.OperableUnit2(OU2)encompassesapproximately180acresinthesouthernportionoftheSiteandwasthelocationofthesmelterbuildingsandoperations.TheSiteisborderedtothesouthby7800SouthStreet,tothewestbytheJordanRiver,tothenorthby6400SouthStreet(WinchesterAvenue),tothenortheastandeastby700WestStreetandtothesoutheastbyHoldenStreet.OreprocessingandsmeltingoperationswereconductedattheSiteandtheadjacentSharonSteelSuperfundSite,locatedimmediatelysouthofOU2.TheSharonSteelSuperfundSiteandtheMidvaleSlagSuperfundSitehavebeenhistoricallylinked,particularlyfromanenvironmentalperspective.Duringtheoperationaltimeofthefacility,fivedifferentleadandcoppersmeltersoccupiedtheSite.ThemilledoresweresmeltedattheSitetoproducelead,arsenic,copper,andothermetals.SmeltingoperationsattheSiteceasedin1958.ContaminationattheSiteisassociatedwithsmelterandmillwastedepositsonOU2aswellassmallamountsofsurfaceandsubsurfaceslagandcontaminatedsoilsonOU1.Contaminantsofconcern(COCs)attheSiteincludearsenic,barium,cadmium,chromium,copper,lead,mercury,selenium,silverandzinc.TheEPAlistedtheMidvaleSlagSuperfundSiteontheNationalPrioritiesList(NPL)in1991basedonstudiesconductedbetween1982and1985thatfoundgroundwater,soilandsedimentscontaminatedwithheavymetals.Potentialhumanhealththreatsincludeddrinkingcontaminatedgroundwateroringesting,inhaling,orhandlingcontaminatedsoils,wastesorsediments.ThecleanupforthisSiteincludesthefollowingareas:1)Theformersmelterpropertyincludingbufferland(OU1andOU2),currentlyknownasBinghamJunction,whichisownedbyindividualpropertyowners2)PortionsoftheJordanRiverripariancorridorwhichareadjacenttotheformersmelterpropertyincludedinbothQUIandOU23)PortionsofresidentialpropertiesinthenorthernportionoftheSiteincludingtheWinchesterEstates,allpartofOU14)GroundwaterbeneaththeSiteforbothOU1andOU2.MidvaleSlagSiteFinalClose-OutReportPage3In1990,theUnitedStatessettleditsclaimsagainstseveralpartiesinvolvedinsmeltingoperationsattheSite.TheEPAdepositedthefundsrecoveredfromSharonSteelCorporation,UVIndustries,Inc.,theUVLiquidatingTrust,andAtlanticRichfieldCompanyintotwospecialaccounts,foruseinthecleanupoftheadjacentSharonSteelSiteandattheMidvaleSlagSite.2.2InitialResponseTheEPAproposedtheSitetotheNPLbasedonstudiesconductedbetween1982and1985thatfoundgroundwater,soilandsedimentscontaminatedwithheavymetalsandarsenic.2.3RemovalActionsTheEPAandtheUDEQconductedinvestigativeworkandaseriesofremovalactions.TheremovalactionsconductedattheSiteinclude:•March1990,RemovalActionforinstallationofafencearoundbothoperableunits.•December1990,EmergencyRemovalActiontodisposeoflabchemicalsandexplosivesremainingonsitefromabandonedlaboratories.•April1995,TimeCriticalRemovalActiontoinstallafencebetweenOU1andOU2•June1996,TimeCriticalRemovalActiontoproperlyabandononsitewatersupplywellsremainingfromthesmelteroperations.•September1996,TimeCriticalRemovalActiontoaddresscontaminationattheButterfieldLumberCompanypropertybyexcavatingcontaminatedsoilsandbackfillingwithcleansoils.•October1996,TimeCriticalRemovalActionatthePioneerCemeterytoexcavatecontaminatedsoils,backfillwithcleansoilsandinstallfencingaroundthishistoricarea.•October2001,TimeCriticalRemovalActiontoremoveapproximately90deteriorateddrumsandassociateddebrislocatedinOU1.2.4RemedialInvestigation/FeasibilityStudiesOU1:ThesuspectedwasteareaswithinOU1wereasmalllandfillandanabandonedwastewatertreatmentplantwithitsassociatedlagoons.AnalysisofsampledatadeterminedthatneitherareacontributedtothecontaminantsofconcerndetectedinOU1soils.SoilcontaminationwascausedbysmelterwastefromOU2transportedbywindandsurfacewateraswellasdeliberateuseofwasteasfill.TheBaselineRiskAssessmentidentifiedarsenic,cadmiumandleadasthecontaminantsofconcernforsoilatOUl.TheinitialOU1FeasibilityStudies(FS)werecompletedin1995fortheNorthWestandSouthEastWinchesterEstates,atrailerparklocatedonthenorthernendoftheSite,andin1998fortheremainingportionsofOUl.Thesereportswereconductedtoconsiderremedialalternativesforthecontaminantsofconcerninsoils.OU2:TheSiteinvestigationsforOU2focusedonmixedsmelterwaste,slagandgroundwater.ThesewereevaluatedduringSiteinvestigationsconductedfortheEngineeringEvaluation/CostAnalysis(EE/CA)preparedin1993,theSupplementalRemedialInvestigationin1997and1998,andadditionalcharacterizationsperformedin2001and2002.Surfaceandsubsurfacesoilsampleswereanalyzedinfivemixedsmelterwasteareas,calcinewaste,silverrefinerywasteandcontaminatedsoils.MidvaleSlagSiteFinalClose-OutReportPage4Metalsanalysisofsamplesintheformerbaghousedustpondareashowedhighlevelsofarsenictrioxidewhichwasdeterminedtobeprincipal-threatwaste(laterclassifiedasCategoryIwaste).Fourareasofslag-coveredsurfaceswerealsosampledfortheEE/CA:air-cooledslag,water-quenchedslag,copperslag,andironslag.Analysisoftheslagintheseareasfoundhighlevelsoflead.ThesestudiesalsodeterminedthattheareaprimarilybeneathOU2washeavilycontaminatedwithCOCs.TheApril2002OU2FSaddressedthegroundwaterandtheMay2002OU2FSaddressedmixedsmelterwaste.Manyremedialoptionswereconsidered,includingnoaction,institutionalcontrols,treatmentanddisposal.Alternativesfromeachstudywerecombinedtoformtheselectedremedy.Thesmelterwasteandsoilmaximumcontaminantconcentrationwas20,400mg/kgforarsenicand26,300mg/kgforlead.Thesedimentmaximumcontaminantconcentrationwas96mg/kgforarsenicand721mg/kgforlead.2.5RecordofDecision2.5.1OperableUnit1OnApri128,1995,theEPAissuedaRecordofDecisionforOU1selectingthefollowingremedy:•Excavationofaminimumof18inchesofsoilin14residentialyardsintheWinchesterEstatesdevelopment,placementofcleanfillandoff-sitedisposalofsoils.•Placementofa2-footthickmonolayersoilcoveroveranundevelopedportionoftheWinchesterEstates.•Institutionalcontrolsfortheareareceivingthesoilcover.•Institutionalcontrols(ICs)forfourotherparcelsprohibitingfutureresidentiallandusewithoutadditionalremediation.•GroundwatermonitoringatthehydraulicallydowngradientSiteboundaryforaminimumof5years.InMay1998andalsoinFebruary2006,theEPAandUDEQissuedESDswhichchangedtheremedycalledforinthe1995OU1ROD.The1998ESDrequiredtheexcavationofcontaminatedsoilsononeparcelofland,ratherthancapping,andthuseliminatedtheneedforICsonthatparcel.The2006ESDchangedlanduserestrictionstoaccommodatemultiplelanduses,createdaconsistentapproachforbothoperableunits,includedriparianmanagement(bothsidesoftheriver)andcontainedacomprehensivegroundwatermonitoringplanincoordinationwiththeOU2remedy.The2006ESDidentifiedthelackofremedialactionobjectivesforgroundwaterintheOU1RODandadoptedtheremedialobjectivesselectedforgroundwaterintheOU2ROD.AfinalESDwasissuedinOctober,2013,clarifyingthegroundwaterRemedialActionObjectives(RAOs)forOUlandOU2.TheRAOsforOU1,asamended,areasfollows:•SoilRAOPreventunacceptableexposureriskstocurrentandfuturehumanpopulationspresentedbycontact,ingestion,orinhalationofsmeltermaterials,associatedcontaminatedmaterials,orCOCsderivedfromthesmelterwastes.MidvaleSlagSiteFinalClose-OutReportPage5• Groundwater

RAOs o Prevent unacceptable

exposure

risk

to current

and future human populations presented

by direct contact, inhalation,

or ingestion

of contaminated

groundwater. o Provide

that future migration

of COCs

into previously uncontaminated

portions

of the US&G Aquifer

and

into

the Deep Principal

Aquifer

is protective

of these aquifers

as sources

of drinking

water. o Provide

that future discharge

of contaminated

groundwater

from

the

Site

to the Jordan

River

is protective

ofthe aquatic environment

and designated

use. 2.

5.

2 Operable

Unit

2 The EPA signed

the OU2

ROD

on October

29, 2002.

The OU2

ROD defined

four categories

of smelter

wastes

found throughout

OU2. Principal

threat wastes

such

as crude arsenic

trioxide

were designated

as Category

I waste. Category

II wastes included

non-slag

soils

and smelter

waste failing Toxicity Characteristic

Leaching Procedure

(TCLP)

and containing

COCs

above commercial

land use-based remediation

goals. Category

III wastes included

non-slag

soils

and smelter

wastes passing TCLP

and containing

COCs

below residential

land use-based remediation

goals.

EPA classified slag

as Category

IV waste. The major components

of the selected

remedy

include: • Groundwater:

The Deep Principal

Aquifer

which

is

a primary

source

of drinking

water

in the

Salt Lake Valley,

is not impacted

by

the Site, although

the shallower

Upper

Sand

and Gravel Aquifer

is impacted

by

the Site.

The limited

action remedy

for groundwater

does not actively

attempt

to restore

the Upper

Sand

and Gravel Aquifer (US&G),

but provides compliance

points

for monitoring

and assessing

as well

as institutional

controls.

The limited

action approach

relies

on groundwater

and surface

water monitoring

to assess whether groundwater

and surface

water criteria

are being

met

for selected

COCs.

These selected

COCs

were established

as

a result

of using alternate concentration

limit (ACL) calculations

and site-specific

analyses

to

be protective

of surface

water quality

criteria

for the Jordan

River.

An

IC

to restrict

well installation

was

also selected

as

a part

of the remedy. The ACLs

for

the four groundwater

COCs

were

set

at the following: o Arsenic

7,000

llg/L o Cadmium

1,560

llg/L o Selenium

900 1-Lg/L o Antimony

3 80 1-lg/L. • Mixed Smelter

Waste:

The selected

remedy

for mixed smelter

waste required

the excavation

and off-site disposal

of Category

I Material,

if found,

and

the installation

of appropriate

covers

over

the remainder

of the Category

II and

III Materials. • Slag:

The selected

remedy

for

the slag (Category

IV Material)

required re-grading

of the slag piles

and

the installation

of appropriate

covers. • Land

use controls

(ICs)

were

also selected

for OU2

to restrict

future excavations

and guide future

use

of the property. Midvale

Slag

Site Final Close-Out

Report

Page

6DuringtheSiteinvestigationsin2001and2002,aPCEplumecrossingtheSitewasidentifiedandreferredtoUDEQforfurtherinvestigation.SincethePCEplumewasdeterminedtobeunrelatedtotheSite,CERCLAactionwasnotdeemedappropriate.The2013ESDclarifiedtheRAOsforgroundwaterforbothOU1andOU2.ThisclarificationremovedthegroundwaterrestorationRAOforbothOUs.TheRAOsforOU2,asamended,areasfollows:•GroundwaterRAOsoPreventunacceptableexposurerisktocurrentandfuturehumanpopulationspresentedbydirectcontact,inhalation,oringestionofcontaminatedgroundwater.oProvidethatfuturemigrationofCOCsintopreviouslyuncontaminatedportionsoftheUS&GAquiferandintotheDeepPrincipalAquiferisprotectiveoftheseaquifersassourcesofdrinkingwater.oProvidethatfuturedischargeofcontaminatedgroundwaterfromtheSitetotheJordanRiverisprotectiveoftheaquaticenvironmentanddesignateduse.•MixedSmelterWasteRAOsoPreventunacceptableexposureriskstocurrentandfuturehumanpopulationspresentedbycontact,ingestion,orinhalationofsmeltermaterials,associatedcontaminatedmaterials,orCOCsderivedfromthesmelterareas.oPreventunacceptableexposureriskstocurrentandfutureecologicalreceptorspresentedbycontact,ingestion,inhalation,oruptakefromsmeltermaterials,associatedcontaminatedmaterials,orCOCsderivedfromthesmelterareas.oProvidethatthefuturemigrationofcontaminantsfromthesmeltermaterialsiswithinlimitsconsideredprotectiveofgroundwater.oPreventsmeltermaterialsfromenteringtheJordanRiverviasurfacewaterflow.•SlagRAOsoPreventunacceptableexposureriskstocurrentandfuturehumanpopulationspresentedbycontact,ingestion,orinhalationofslagorassociatedcontaminatedmaterials.oPreventunacceptableexposureriskstocurrentandfutureecologicalreceptorspresentedbyuptakefromslag,associatedcontaminatedmaterialswithinslag,orCOCsderivedfromtheslagareas.oProvidethatthefuturemigrationofcontaminantsfromtheslagorcontaminatedmaterialswithinslagiswithinlimitsconsideredprotectiveofgroundwater.oPreventslagorcontaminatedmaterialswithinslagfromenteringtheJordanRiverviasurfacewaterflow.2.6RemedialActivities2.6.1OperableUnitIUDEQwastheleadagencyfortheOU1remediationasdefinedinacooperativeagreementbetweentheEPAandUDEQ.Remediationworkwasconductedintwophases,withtheWinchesterEstatesportionoftheremediationbeginninginSeptember1995andendinginApril1996.ThesecondphaseoftheOU1remediationbeganinJuly1998.ThefinalinspectionoftheMidvaleSlagSiteFinalClose-OutReportPage7OU1remedialactionoccurredinJanuary1999andtheRAreportforOU1wassignedinMarch1999.TheEPAandUDEQinstalledthegroundwatermonitoringsystemandperformedtheriparianremediationselectedinthe2006ESDduringtheimplementationoftheOU2remedy.2.6.2OperableUnit2Aconsentdecreegovernedworkconductedbythemainpropertyowner,Littleson,Inc.IntheconsentdecreesignedwiththeEPA,MidvaleCity,andtheUnionPacificRailroad,thepropertyowner,Littleson,Inc.,agreedtoperformtheremedialdesign/remedialaction(RD/RA)forthesmelterwastes,slagsandimpactedsoilscomponentsofthe2002RODremedy.Intheconsentdecree,MidvaleCityagreedtoenactandenforceICsintheformofanordinance.ThisconsentdecreewasenteredonNovember16,2004.UDEQwastheleadforthegroundwaterportionofthe2002RODremedyaswellasthe2006ESDforOU1.ThisworkwasperformedunderacooperativeagreementwiththeEPA.TheEPAwastheprimaryleadfortheriparianportionofthe2002RODremedy.SmelterWastes,Slags,andImpactedSoilsLittleson,Inc.,completedallremedialactivitiesasplanned,andnoadditionalareasofcontaminationwereidentified.TheEPA,UDEQandMidvaleCityconductedafinalinspectionoftheworkuponcompletionofthephysicalconstructiononJune26,2006.Aone-yearwarrantyperiodbeganonJuly6,2006,toensurethattheremedycontinuedtooperateasdesigned.OnMay15,2007,theEPA,UDEQandMidvaleCityrepresentativesconductedasecondfinalinspectiontoverifythattheremedyremainedeffective.ThisremedywasdeclaredoperationalandfunctionalonAugust13,2007whentheEPAapprovedtheRemedialActionReport.Onthesameday,theEPAcertifiedthecompletionoftheconstructionworkrequiredundertheconsentdecree.2.6.3OperableUnits1and2RiparianZoneTheEPAandUDEQconductedtheRD/RAworkalong6,800feetoftheJordanRiverripariancorridoradjacenttothewesternboundaryoftheSite.TheobjectiveforthisworkincludedthereductionandeliminationofriverbankerosionthatcouldreleasesmelterwastefromtheSiteintotheriver.Thisworkwasconductedinfourphases,withthefinalphasebeingcompletedinAugust2011.SaltLakeCountyconductedthePhase3portionofthisworkundertheEPAandUDEQoversight.Phase3involvedcompletingtheriparianworkfromWinchesterEstatessouthalongtheeasternbankoftheJordanRiverandwasfundedthroughagrantfromtheEPAusingspecialaccountmoney.TheEPA,UDEQandSaltLakeCountycompletedallremedialactivitiesasplanned.TheEPAandUDEQconductedapre-finalinspectiononAugust10,2011,whichresultedinascheduleforthecontractortocorrectminoritems.Theremaining"punch"listitemwasreplacementofsomedamagedvegetation.TheEPAandtheStatedeterminedthatallRiparianZoneworkwasconstructedand/orcompletedaccordingtotheRODanddesignspecifications.GroundwaterUDEQcompletedtheinstallationofthegroundwatermonitoringsysteminDecember2008.ConstructionofthesystemwascompletedunderacooperativeagreementestablishedbetweentheEPAandUDEQ.Underthiscooperativeagreement,UDEQimplementedthegroundwatermonitoringsystemdesigndevelopedbytheEPAandconductsquarterlymonitoring.InMidvaleSlagSiteFinalClose-OutReportPage8September2009,theEPAapprovedthegroundwaterRemedialActionReportinwhichtheEPAdeterminedthatconstructionofthemonitoringsystemwascompleteinaccordance withtheRODanddesignspecifications.2.7InstitutionalControlsTheRODsforOUl&OU2selectedtheuseofiCsto:preventexcavationoftheareasreceivingthesoilcover;restrictwellinstallation;andguidefuturelanduse.In2004,MidvaleCityestablishedICsintheformofanordinancefortheBinghamJunctionZone(MidvaleCityCodeSection17-7-9.11,InstitutionalControls)topreventexposuretocontaminatedmaterialsandtorestrictfutureexcavations.Inaddition,Midvalelocallandusecontrolsrestrictsurfacewatermanagementandirrigationpracticestolimitinfiltrationintheplumearea.TheICsalsoprovideforperiodicinspectionandlong-termmaintenanceofcovers.OnJune26,2007MidvaleCityadoptedordinanceNo.6/26/20070-8torestrictgroundwateruse,toregulatesurfacewatermanagementandirrigationpractices,andtorequirevapormitigationsystemsforbuildingsconstructedoverthePCEplume.ThisordinanceamendsandreplacestheordinanceadoptedbyMidvaleCityin2004.GroundwateruseattheSiteisalsorestrictedthroughtheSharonSteelRestrictedAreawhichtheUtahDivisionofWaterRights(UDWR)administersthroughtheSaltLakeValleyGroundwaterManagementPlan.RestrictivecovenantsarealsoinplaceontheformerLittlesonandUnionPacificRailroadproperties.LittlesonimplementedthesmelterwasteandslagRD/RAwithaneyetowardsredevelopment.TheBinghamJunctionplanenvisionedcommercial,industrial,retailandbothsingleandmultifamilyhomesattheSite.Todayalarge-scale,mixed-usedevelopmentisbeingconstructedonbothOUlandOU2.3.0GROUNDWATERMONITORINGRESULTSUDEQconductssemi-annualgroundwaterandsurfacewatermonitoringattheSiteusingaplandevelopedduringtheremedialdesign.ThemonitoringsystemattheSitecurrentlyconsistsofcolocatedwellsat15locations(atotalof30wells)andtwosurfacewatersamplinglocations.Eachwellpairconsistsofoneshallowmonitoringwell,screenedintheupperintervaloftheUS&GAquifer,andoneintermediatemonitoringwell,screenedatalowerintervalwithintheUS&GAquifer.Themonitoringsystemisdividedintofourgroupsandconsistsofup-gradient,downgradient,plumecoreandACLmonitoringwells.TheprocessfordevelopingACLsisdiscussedintheOU2RODwithsupportingdocumentationprovidedintheAdministrativeRecord.AlthoughtheselectedremedydidnotattempttoactivelyrestoretheUS&Gaquifer,itprovidedforthemonitoringofgroundwaterandsurfacewatertoassesswhetherapplicablegroundwaterandsurfacewaterqualitycriteriaarebeingmetfortheselectedCOCs.ItalsoprovidedforthecreationofICstopreventexposuretothecontaminatedUS&Gaquifer.PointofassessmentlocationsformonitoringtheUS&GaquiferwereselectedbasedonthelocationandmovementofarseniccontaminationontheSite.ArsenicwasselectedastheindicatorchemicalsinceitisthemostmobileandwidespreadoftheCOCsinthisaquifer.MonitoringwellsforpointsofassessmentwereinstalledintheshallowanddeepportionsoftheUS&Gaquiferinaccordancewithplansandspecificationsdevelopedduringtheremedialdesign.MidvaleSlagSiteFinalClose-OutReportPage9Thespecificmonitoringobjectivesareasfollows:•ConductgroundwaterandsurfacewatermonitoringtoassessifapplicablegroundwaterandsurfacewaterqualitycriteriaarebeingmetforCOCs(antimony,arsenic,cadmiumandselenium).•AssessmonitoringdataanddetermineifcontaminationismovinglaterallyorverticallywithintheboundariesoftheSite.TheUDEQ'sSemi-AnnualGroundwaterandSurfaceWaterMonitoringReport-MidvaleSlagSuperfundSitedatedMay24,2013statesthat"COCconcentrationsintheACLmonitoringwellshavenotexceededtheirrespectiveACLvaluesandthatCOCconcentrationsinsurfacewaterhavenotexceededestablishedsurfacewaterqualitycriteriavaluesfortheJordanRiverinmonitoringresultsfrom2008topresent."4.0REUSE/REDEVELOPMENTBecausethecommunityrequestedfuturelandusebeconsideredintheremedyselection,slagpilesweregradedtobettersupportredevelopmentandappropriatesoilcoversweredesignedasaninterimmeasuretofacilitatefutureredevelopment.TheSiteislocatedrightofftheI-15andI215freeways,within20minutesofmostSaltLakeCountylocations.OnAugust29,2006,MidvaleMayorJoanneSeghinisaid,"Thelandconstitutes20percentofMidvaleandisoneofthelastpiecesofundevelopedpropertyinthecityandwasadiscouragingblight."RedevelopmentbeganoncetheinstitutionalcontrolswereestablishedandtheReadyforRe-useDeterminationwasissuedonMay23,2008.Today,approximately65percentoftheSitehasbeenfullydevelopedformixed-usethatincorporatesmajorretailandofficespace,alongwithneededhousingforMidvaleCity.TheUtahTransitAuthoritymasstransittrainsystemopenedastationattheSitewhichservesthenew"greensustainablecommunity."ThesuccessfulrevitalizationoftheMidvalecommunityissustainable,providesmixeduse,andelevatesthequalityoflifewithrevitalizationforyearstocome.ImprovementoftheripariancorridorandbiketrailalongtheJordanRiverhasalsohelpedthisareathrive.ThesesuccessfuleffortshaveresultedintheinfluxofnewresidentsnowinhabitingtheSitefulfillingtheinitiativeforrevitalizationenvisionedyearsagobyMidvaleCity,UDEQandtheEPA.5.0OPERATIONANDMAINTAINENCEMaintainingappropriatesoilcoveranddrainageisarequiredoperationandmaintenanceIC.MidvaleCityisresponsibleforenforcingthecapandsoilICsthroughconductingthefollowingactivities:inspection/observationduringredevelopmentconstruction;reviewofdevelopmentconstructionplansandspecificationsforconformancewithcoverrequirements;stormwatermanagementandirrigationrestrictions;andtemporarystockpileandcoveringofsoilandslag.UDEQconductssemi-annualgroundwaterandsurfacewatermonitoringatthisSite.Inmonitoringresultsfrom2008topresent,COCconcentrationsintheACLmonitoringwellshavenotexceededtheirrespectiveACLvaluesandCOCconcentrationsinsurfacewaterhavenotexceededestablishedsurfacewaterqualitycriteriavaluesfortheJordanRiver.MidvaleSlagSiteFinalClose-OutReportPage106.0 DEMONSTRATION

OF CLEANUP

ACTIVITY

QUALITY ASSURANCE/ QUALITY CONTROL The

Site

was remediated

using

funds

from

a special account.

The 2004 Consent

Decree governed work conducted

by

the property

owner, Littleson,

Inc.

The EPA

and UDEQ implemented

the riparian

work

and groundwater

monitoring, respectively.

The EPA

and UDEQ conducted regularly scheduled

Site inspections

and visits

to review progress

of the remediation

and ensure the QA/QC

plan

was being complied

with. The Quality Assurance

Project

Plan

for

the

Site incorporated

the EPA QAIQC procedures

and protocols.

The EPA analytical

methods

were

used

for

all confirmation

and monitoring

samples during removal

and remediation

activities

. The EPA

and UDEQ determined

that QA/QC protocols

and procedures

were adhered

to

in order

to assure satisfactory

execution

of the response

actions. 7.0 FIVE- YEAR REVIEWS Three statutory

five-year

reviews

have

been conducted

at the Site,

the first

in October

2003, the second

in December

2008

and

the latest

in April2014.

No issues

were identified

in the 2014

five

year review.

The Site-wide

remedy

protects

human

health

and

the environment because exposure

pathways

that could

result

in unacceptable

risks

are being controlled

through the completed

remedial

activities

and effective

ICs.

The

next five-year

review

is scheduled

for completion

in April2018. 8.0

SITE COMPLETION

CRITERIA This

Site meets

all the

Site completion requirements

as specified

in the OSWER

Directive 9320.2-22,

Close-Out

Procedures

for National

Priorities

List Sites.

All remedial

activities

at the Midvale

Slag

Site

are consistent

with agency

policy

and guidance.

The

only remaining

CERCLA activities

to

be performed

at the

Site

are O&M

and five-year

reviews. Therefore,

the EPA

has determined

that

no further response

action

is necessary

at the Midvale

Slag

Site

to protect

human health

and

the environment. Approved

by: Martin Hestmark Assistant

Regional Administrator Office

of Ecosystems

Protection and Remediation Midvale

Slag

Site Final Close-Out

Report

Date

Page

IIBibliographyUSEPA,1995.EPASuperfundRecordofDecision:MidvaleSlag(OU1),Midvale,UT.April28.SEMS#90224CDMFederalProgramsCorporation,2002.FinalFocusedFeasibilityStudyReportforGroundwaterinOperableUnit2.May.SEMS#1230637CDM,FederalProgramsCorporation2002.FinalSiteCharacterizationReport,FinalPhaseIISiteCharacterizationReport,MidvaleSlagSuperfundSite,OperableUnits1and2.May.SEMS#494559USEPA,2002.MidvaleSlagSuperfundSiteOU2Midvale,Utah;RecordofDecision.October29.SEMS#2003421USEPA,2003.FirstFive-YearReviewReportforMidvaleSlag.October20.SEMS#1064962CDMFederalProgramsCorporation,2004.FinalGroundwaterandSurfaceWaterMonitoringPlanMidvaleSlagOperableUnits1and2,MidvaleUtah.September30.SEMS#1128659CDMFederalProgramsCorporation,2005.TechnicalMemorandum:EvaluationoftheMineralResourcesReclamationCompany(MRCC)PropertyAreaforOperableUnit2;MidvaleUtah.June1.SEMS#1072871CDMFederalProgramsCorporation,2005.TechnicalMemorandumforPreliminaryRemediationGoalsandDecision-MakingProcessatMidvaleSlagOU1.June1.SEMS#1072871CDMFederalProgramsCorporation,2005.FinalSummaryofGroundwaterSamplingActivitiesbeforeRemedialActionattheMidvaleSlagSuperfundSite,OperableUnits1and2.July.SEMS#1025159USEPA,2007.TechnicalClarificationofOU2RecordofDecision.August10.SEMS#1074952USEPA,2006.ExplanationofSignificantDifferences,MidvaleSlagSuperfundSite,Midvale,Utah,OperableUnit1.February14.SEMS#1052312USEPA,2008.ReadyforReuseDetermination.May23.SEMS#1072872USEPA,2008.SecondFive-YearReviewReportforMidvaleSlagSupe1jundSite.December.SEMS#1092845URSCorporation,2009.FinalMonitoringWellInstallationReportfortheMidvaleSlagSuperfundSiteGroundwaterMonitoringSystem,MidvaleUtah.May.SEMS#1117644URSCorporation,2009.FinalQuarterlyGroundwaterandSurfaceWaterMonitoringReport,ThirdQuarter.November.SEMS#1128655URSCorporation,2010.FinalSemi-AnnualGroundwaterandSurfaceWaterMonitoringReport,Semi-AnnualSampling:Spring2010,MidvaleSlagSuperfundSiteMidvale,Utah.September.SEMS#1167643MidvaleSlagSiteFinalClose-OutReport-BibliographyPageBlUDEQ,

2010. Semi-Annual

Groundwater

and Surface

Water Monitoring

Report, Midvale

Slag Superfund

Site. October.

SEMS#

1215930 UDEQ,

2011. Semi-Annual

Groundwater

and Surface

Water Monitoring

Report, Midvale

Slag Superfund

Site.

May. SEMS

# 1265863 UDEQ,

2011. Semi-Annual

Groundwater

and Surface

Water Monitoring

Report, Midvale

Slag Superfund

Site. September.

SEMS#

1249661 USEPA,

2004. Institutional

Control

Process

Plan, Operable

Unit

No.

I, Midvale

Slag

Site. Attachment

to the RD/RA

Consent

Decree,

Civil

No.

2:04 CV-843. Midvale

City,

2007. Ordinance

No. 06126/07

0-8.

An ordinance

creating

Section

8.10

in Chapter 8 of the Midvale Municipal

Code

titled "Institutional

Controls Ordinance

for Bingham Junction,

Jordan

Bluffs

and Designated Rights-Of-Way." USEP

A 2011. Preliminary

Closeout

Report. September. Midvale

Slag

Site Final Close-Out

Report- Bibliography

Page

B2