Document emKN319eO6KwkwYmMa8Z7M2Og

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY WASHINGTON, D.C. 20460 SUODfWf :CASTOEfAMD R G E N C V RfSfOMSe MEMORANDUM SUBJECT: TCComEpIiRlaItSioAnsosefsIsnmfoernmt ation Relating to Early/Interim Actions at .Superfund Sites and the TO: Superfund Division Directors, EPA Regions 1-10 Purpose teTPdraerihcrocilhstiyeslciocoootrrinomoienmnptthiAaelyarkglitiemienonngneacacyo(ttTfi(soCEiinntPEesfsAo).arw)tmTRiShtauheetipgoaieincnorftnfuowuaarnlamldsOoapsrftiirfptoeiecopnseta.esrrIe.netftIdeiatarliplsenronionrcpevhesriaddoplevaoinstinidostienhensfitsoecoruxdmrrpoeroacqesutnuiumoternsieentsnsrfetotfogmrramoTramdaCytiEinUbog.e.nSeu,axsbEiesodntuvitntiorgtohsEneumPptopAexonirgtctauilStiyduaponefrcfeuonnd Background maoitcIcfnhneeshfitecnsrcuSielotnarurssenocs,adspisgrmlaicteenrennasaeimgdessnmnrmehhbtivdssaueefolrpmo"inauncer2ttascair0Tcnoirscd1oncCyeue1nispnErbn,cteioeicl1tdcfumh.geeedeemrB,moeenUkfeadniicotsi.fcdeSteelehtrondt.oaagce(Eltu2hyoincpTc,unpavolCmcsigrintevrdEu/anoemiadnartnprisc,3wmeao")ist.msemeib,eTiongayasmnhthlnaafaiuti(osllm-RnplrPoReomfrafrCfto-loseCaeuy)tdntvetsioftiieoctiosdsseatnriiemblsnoonn.ahgnf,cosuemeesAnmxdtceuagpaavidleonnneainscelruphcuseeryae,arperata(ert.ilnEootfTohfdndPnehuhAceoetcatxhf)stazpietpasvohesdruerfeedeibsTsmavlysfiCveomessalrthnEoeeietnl,pmnaadowmltb,namlfheaceointnaercoitndchnaxIchRlfitiecoahstIronroeSmtlitxwosdodiatgxeocietciviiircctoeiyasivnlttloey,eupdndtidioanepgstoh,ient Early or Interim Action for TCE IenxicsotinnsgidFeerdinegrahloswtattuhtees20a1n1d E'ICPAE gIRuiIdSaanscseesosfmfeerntht eshfooulllodwbiengu:sed in Superfund decision making, the C' Uur.rSe.nEtlPyAav(a2i0la1b2l)e. oTnolxiniceoalot:g-ic-aspl Review o f T*ri-cnhlor-oet-hylene in Support ofthe Integrated Risk Information System (IRIS). Sierra Club v. EPA 18cv3472 NDCA Tier 2 ED 002061 00090511-00001  awwtCiEunonoaliictiteanrlfhhulclesiyctdtmaiihedoimpbneierntirgeNaaaii,nnstsbaeaetglfte,senoirnorsrarieonimpiitdsannpikuvlcia,rcteaoOocieanptcsi,itclurcoioieunbnaarrrgngtssec:rdhroowetEenHouashtPpplaraetAsoozhdn,naldmeerestrxdfhxeefapoepesyausceochctsbsttsateuie:SszorraauneFterotxbsosodpsrttgestaooxpaepksnncueoeeceinrdsceeepseasduwodarrsnPiclebetdyoohsypnlaodlorcaucueofettvtstniitieooehattclnnerdeot.asvipCSotIeamiunnorotpsnneaoSeentssufritesntfpaheofigleifusneerwsemdfcnifinhtcafipneigyndcrdcuhsohPtrussgelit3icranaht.haneglemtshc(haNwa2ua,lsChmniefedsPear,t)ncei,EmoapPneposAppiosrurwtoelpapinltarltirioaatntcoe,tf dDfoeervvaeellsooipnpmgmleeennettaxalplsottosaxugirecesehmfafeascnyt'stb:beIenseunmffdoicesitteeenramtsteions,epdirtoyidseutacsbesyuamEnPeaAddv.therasteadseivneglloepemxpenotsaulreefaftecatn,4ybouftstehveeRraFlC mvStpIsbeaFRroeRpxdeauroixiaeespvlIpcrcsufikScoeprceonoeiorsAiDlrfnnossteureiyseansceaminrsibndcetdvhoedealaseieepSenfsbnrsraoemttuoamcmealhrupnestdielehareeroemcnGxn:wrdceeetfeithIuffshmuncRoffGeieneehotdmufInsduccaafSm7httiirdnrmssdcbuani,ecaacesmydeofealkntxuitsrecfancapcrmoraanbeibiooislnnrzaafcosnshggeosluuelIceledinrsryltaseadaehshmnlbSrtmlteaotceyiihurnflnoapedapeaagtnnnrutteotteiiddtihstrromxsosiapifen,eimktnuteeciniidinoc.iooennRttadinsn-yefcftiw;itlsa2tfcoiuvkheocVadafiiesarAUvgolia,cunaolhasgtruesgsfi/itecnlvimfseeavtoirdisdec5bueetnsi-yiIlsrstasmaIesCeicpvlpniHdueabeeEaAusntcriuttoslatogittmiieiuf)hgtenoir6yssaeecnnnuainc.cnotepedoiyhdIxfxmHpdftrpopeosroeeeaecoofornaslftsisrsosteeilsuiuocStacnfemhrruittstereesrhaipEex,sftetieschipvsiacccroneaornofeeggepilsdnnxuiuvnuonceapsairirsdexerezeeetiinwpiectcooroitttsooe.oorenfasvsnatdiupnpheMtnrrodriarthooyeeetananigvsscnsbtlaseehiaiuetrmnntfehaddiotamoeeleirrnnc(iigsegPscihetaksaoatoniclhoxrou-ehetnirlfcdaFsil5,tl*,yy AacpoRnpAcrRoepnSrt:riaaAtteitosrneitqeousrictroeoxmnitceainmtytsinv(aaAtleuRdeAswRmistha)y,IiCenxcEilsutaddtihndagrtemcssooeurdledbsryteripCnrEgeesRenCnttLstaAapt,epalsidctdaanibtdiloeanrodarsl r(oenrloepnvo-alEnicPtyaA.n8)dTCE (2aN)(a1t)i(oiin)a(Al O)).il and Hazardous Substances National Contingency Program (NCP) ((see 40 CFR 300.415 (b){l)-(3) and 300.430 3 U.S. EPA (1991). Role o fthe Baseline Risk Assessment in Superfimd Remedy Selection Decisions. OSWER Directive 9355.0-30. Currently available on-line at' s n s - t4ChUuart.rSEe,nPEtAlPyAfaov(lla1oi9lwa9bs1l)ie.nGoenvulaiidnlueealiatnitne'sgfpoorteDnetivaellodpemv>eeylno.-ptaml eTnotxailctitoyxRiciistky Assessment (EPA/600/FR-91/001) describes the procedures associate,d "w, ithn hum'Aan ex' posure to environmental agents. a5vUa.iSla.bElePAon(l2in0e03at5Hcmuma-n-H-ealth Torn tty 1alues hi Superfim;d:RirskAwssevssrments (OSWER Directive 9285,7-53). Currently 11U.S. EPA (2009), Risk Assessment Guidancefor Superfimd: Volume / Human Health Evaluation Manual (Part F, Supplemental Guidance foi inhalation Risk Assessment. This document is currently available on-line at: 7 U. ..S. .. E. PA (2004). Air Qualify Criteriafor Particulate Matter: Volume It Microenvironments are defined as a space that can be treated as a well-characterized, relatively homogeneous location with respect to pollutant concentration, for a specified tli.;mhPe.Apec-rtipoudh.(eep.ga...,grooyo/nmcesai,n,'cfhiottm-'regsc,orrdeisstuajuarva;n,.ctsf,ms?cdheoiodl"s9, 5o3ff9i8ces, inside vehicles, or outdoors). Currently available online at: s For a description of ARARs, see, for example; mt|xvwww.epis :id ; s .* ,is Page 2 of 3 Sierra Club v. EPA 18cv3472 NDCA Tier 2 ED 002061 00090511-00002 Summary tiaEnovxvaeieisllistamitnbigiglneaagttituooeixn,disraceonodlcfuoeicgnpeidc,roaooolvrriicdnaoefinorstrctrmhooanalttttiarhomeensiphniaonazntsaiduoredpnrspsiodpsrehotnsooetuifdflydebacsyroiltanye-ssoriiedrteleia.rntIetenedardricmlooyinnaocgcretinsionotnr,taeItrfRioiomrInSbsaugcoietlfindToeinCnr(agEsls)l.ywwphhreeorrveeidaepsprthoperbiaetset Additional Information rAhceotdqtnpdut:iai/trc/iewot nfMwuawrlitchi,henepafreoailr.ngmSfoocavrot/imozozsnawatifreoaernvl/a.vatae(pdCothroiinevftarpSuocsriioeinnn/ctreaunPsdioolhnitctaypn:Bd//rweaxnwicswhti.)neagptaO(.g7So0Wv3/)oE6sRw03eg-ru8/ir8di3sa3knacisefsyceoassnumbheeanvfteo/.uqPnuldeesaatstieons or ec: RBMDRDKBNCJFSBCCMMortaieayaaihaeaiiaihcgragrtrrcvnnnvahninbnerothgenradtiyakhlaedllnaiyMByorlrNyseSeSBidatLnFenlMtatJiiCSranemclootHKHeSotlHahjhashaceBaocyoraotceauninnoemandpsleukaspi,lsrzjt,,ukrst,de,aaoi,zhtOlsniOOy,rOgnanOaOnaca,,SeuO,f,SSmsiSnSSOa,OnsWoOOWWGdWW,Wv,sOnSE,SSkaOCEO,EEWESWEOCEi,WRO/,SSRRWRROSRASEWEO/WS//EW/I/W/SOOR/EOOROWPSOREWER/PEBAS/SEWIS/RIREMPORRR/LEORRRP/R/ECLRTITRRO/MAEOFR/OO.ICO/EIRFOS/ORMUKMSSSRRSRTOTTII Sierra Club v. EPA 18cv3472 NDCA Page 3 o f3 Tier 2 ED 002061 00090511-00003 Sierra Club v. EPA 18cv3472 NDCA Tier 2 ED 002061 00090511-00004