SDM S Documen tI D 200722 3 UNITE D STATE S ENVIRONMENTA LPROTECTIO N AGENC Y REGIO N 8 99 9 18 TM STREE T- SUIT E 30 0 DENVER , C O 80202-246 6 http://www.epa.gov/region0 8

Ref : 8EPR-S R ACTIONMEMORANDUM SUBJECT :

FROM : THROUGH :

TO : Documentatio n o f th e Internationa l Smelte r Sit e (Time

Critica l & Fund-Lead ) Remova l Actio n nea r Pin e Canyo n i n Tooel e County , Uta h8470 4 Joshu a Knight , RP M Dal e Vodehnal , Directo r Superfun d Remedia l Progra m Steve n D . Hawthorn , Superviso r Emergenc yRespons e Tea m Dou g Skie , Directo r Preparedness , Asses s ergenc yRespons e Progra m Caro l Rushin , Assistan t Regiona l Administrato r Offic e o f Enforcement , Compliance , & Environmenta l Justic e Ma xH . Dodson , Assistan t Regiona l Administrato r Office-o f Ecosystem s Protectio n & Remediatio n Sit e ID# : Categor yof'Removal : 086 Y Time-Critical , PRP-Lea d


### I . PURPOS E Th e purpos e o f thi s Actio n Memorandumi s t o documen t approva l o f a Potentia l Responsibl e Party-Lea d (PRP-lead)Remova l Actio n describe d herei n fo r th e Internationa l Smeltin g an d Refinin g site , Tooel e County , Uta h(Site) . Th e remova l actio n wil l involv e th e constructio n o f stor mwate r diversion berm s t o protec t a n existin g soi l cove r ove r a landfil l a t on e location , Pag e 1 o f 1 0

'rinted on Recycled

Paperan d t o plac e a soi l cove r ove r lea d an d arseni c contaminated , lo w

p H soil s a t a separat e locatio n o f th e Site . Condition s existin g a t th e Sit e presente d a nendangermen t t o huma n •he'alth'-'aM

dth e environmen t an d mee t th e criteri a fo r initiating , a Remova l Actio n unde r 4 0 CFR , Sectio n 300.415(b ) (2 ) o f th e Nationa l Contingenc yPla n (NCP) . Th e action s discusse d i n thi s memorandumar e anticipate d t o requir e les s tha n 1 2 month s t o complete . Base d o n th e natur e o f th e Sit e condition s an d response , ther e ar e n o nationall ysignifican t o r precedent-settin g issue s associate d wit hthi s Remova l Action . II . SIT E CONDITION S AN D BACKGROUN

D A . Sit e Descriptio n 1 . Remova l Sit e Evaluatio n Th e Internationa l Smeltin g an d Refinin g (IS&R ) Sit e wa s liste d o nth e Nationa l Prioritie s Lis t (NPL ) i nJul y 2000 . Th e Sit e consist s o f land s impacte d byhistori c smeltin g an d millin g activitie s fro mth e IS& Rfacility . On e Operabl e Uni t (O UT ) currentl yencompasse s th e entir e site . ARemedia l Investigation/Feasibilit yStud y(RI/FS ) i s currentl yunderwa ya t th e Site . Th e RI/F S i s PRP-le d by Atlanti c Richfiel d Company(ARCO) , unde r th e Administrativ e Orde r o n Consen t fo r th e Internationa l Smeltin g & Refinin g (IS&R ) Sit e Remedia l Investigation/Feasibilit yStudy , EP ADocke t No . CERCL A VIII-2001-1 2 (Order) . 2 . Physica l locatio n Th e Internationa l Smeltin g an d Refinin g (IS&R ) Sit e (UTD093120921 ) i s locate d adjacen t t o th e Pin e Canyo n townshi p an d Tooel e city , Utah , approximatel y3 0 mile s southwes t o f Sal t Lak e City , Utah . Th e Sit e locatio n i s shown i nfigur e 1 (attached) . Part s o f th e Sit e li e i n Section s 7,18,19 , an d 3 0 o f T S 3S-R3 Wan d Section s 12 , 13 , 14 , 23 , an d 2 4 o f T3S-R4W , Sal t Lak e Meridian . Th e Sit e i s roughl ybounded'byth e Oquirr hmountain s t o th e east , rura l residentia l an d farmlan d o n th e nort han d south , an d Pin e Canyo n an d Tooel e t o th e west . A depictio n o f th e Sit e wit hth e location s o f th e tw o Pag e 2 o f 1 0UNITE D STATE S ENVIRONMENTA L PROTECTIO N AGENC Y REGIO N 8 99 9 18 TM STREE T- SUIT E 30 0 DENVER , C O 80202-246 6 http://www.epa.gov/region0 8

Ref : 8EPR-S R ACTIO NMEMORANDU

M SUBJECT :

FROM : THROUGH :

TO : Documentatio n o f th e Internationa l Smelte r Sit e (Time

Critica l & Fund-Lead ) Remova l Actio n nea r Pin e Canyo n i n Tooel e County , Uta h8470 4 Joshu a Knight , RP M Dal e Vodehnal , Directo r Superfund Remedia l Program Steve n D . Hawthorn , Superviso r Emergenc yRespons e Team Dou g Skie , Directo r Preparedness , Assessmen t & Emergenc yRespons e Prog r Caro l Rushin , Assistan t Regiona l Administra t Offic e o f Enforcement , Compliance , & Justic e Ma xH . Dodson , Assistan t Regiona l Administrato r Offic e o f Ecosystem s Protectio n & Remediatio n Sit e ID# : Categor yo f Removal : 086 Y Time-Critical , PRP-Lea d


### I . PURPOS E Th e purpos e o f thi s Actio n Memorandu mi s t o documen t approva l o f a Potentia l Responsibl e Party-Lea d (PRP-lead)Remova l Actio n describe d herei n fo r th e Internationa l Smeltin g and Refinin g site , Tooel e County , Uta h(Site) . Th e remova l actio n wil l involv e th e constructio n o f stormwate r diversio n berm s t o protec t a n existin g soi l cove r ove r a landfil l a t on e location , Pag e 1 o f 1 0

Printed o n Recycled

Paper

### propose d action s i s presente d i n Figure s 1 & 2 (attached) . Th e Car r For k Landfill ' Are a i s nea r th e eas t sid e o f th e Sit e an di s approximatel y6 acre s i nsize . I t contain s mostl y--debri s fro mth e demolitio nphas e o f th e reclamatio nprojec t whic hoccurre di n1986 . Th e are a i s locate di nSection s 18 , 19 , and2 0 o f T S 3S-R3W . 'Th e Sit e Entranc e Staine dSoil s Are a i s nea r th e wes t sid e o f th e Site , nea r th e poin t entr yfo r sit e visitors . Th e soil s ar e o f a dar k brownis htint , an d ar e approximatel y4 acre s i nsize . Th e are a i s locate d i nSectio n1 3 o f T S 3S-R4W . 3 . Sit e Characteristic s Coppe r smeltin g bega na t th e Sit e i n1910 . Th e Smelte r ha da capacit yo f 4,00 0 ton s o f coppe r ore • pe r day . Tw o year s later , coppe r or e supplie s decline dan dIS& Rbuil t a lea dsmelter . I n.1915 , Anacond a (no wARC O - th e decline dAtlanti c Richfiel dCompany ) purchase dth e IS& R subsidiary . Ove r severa l year s th e owner s adde da lead

zin c sulfid e flotatio nmil l an da sla g treatmen t plan t fo r lea dand zin c recovery . Coppe r productio n cease d i n 194 6 whe n th e coppe r smelte r closed . Lea dsmeltin g cease di nearl y1972 . A nestimate d650,00 0 .tons pe r yea r o f tailings , sla g an d flu e dus t wer e produce d durin g earl yoperation s a t th e IS& RSite . Th e Sit e wa s reclaime di n198 6 unde r a voluntar y agreemen t betwee nARC O an dth e Stat e o f Utah . Th e reclamatio ninclude ddemolitio no f al l building s a t th e Site , consolidatio no f th e wast e material , an da coverin g o f th e majorit yo f th e wast e material . Th e Sit e cover s abou t 1,20 0 acres . Ther e ar e approximatel y33 0 acre s o f tailings , 27. 5 acre s o f metal-contaminate dslag , 1 3 acre s o f .settlin g ponds , abou t 5 0 acre s o f landfill s an d12 5 acre s o f smeltin g wastes . Th e remainin g acreag e consist s o f ope narea , mostl yunimp.acte dbysmelte r operations . Investigation s indicat e th e presenc e o f arsenic , cadmium , copper , lead , mercur yand zin c i nth e soils , tailing s and slag . 4 . Releas e o r threatene d releas e int o th e environmen t

Pag e 3 o f 1 0

### o f a hazardou s substance , o r pollutan t o r contaminan t Lea dan darseni c ar e th e primar ycontaminant s o f concer n wit hregar dt o huma nhealt hat . th e Site . Lea dan d arseni c ar e hazardou s substance s a s define db yCERCL A Sectio n10 1 (14 ) . Thes e hazardou s substance s -wer e release dint o loca l soil s b yhistori c smeltin g an d millin g activitie s an dwer e transporte daroun dth e area s primaril yb yconsolidatio ndurin g th e 198 6 reclamatio n (Car r For k Landfill ) an dbysurfac e runof f (Sit e Entranc e Staine dSoil s Area) . Th e exposur e o f thes e metal s pose s a substantia l an dimmediat e ris k t o visitor s an dSit e worker s withi nth e area . Th e Sit e i s use dextensivel yb yloca l are a resident s (jogging , walking , birdwatching , hunting , etc.) . Lea dan darseni c i nsoil s present s a ris k o f incidenta l ingestion . Sample s take nfro mth e Car r For k Landfil l Are a sho wlea d a t 120 0 pp man darseni c a t 11 0 ppm . Sample s take na t th e Sit e Entranc e Staine dSoil s Are a sho wlea da t 380 0 pp man darseni c 87 0 ppm . Thes e level s ar e abov e actio n level s tha t hav e bee nestablishe da t othe r Uta hsites . 4 . NP L statu s Th e Sit e i s currentl yliste do nth e NPL . Th e Car r For k Landfil l an dth e Sit e Entranc e Staine dSoil s Are a ar e locate dwithi nth e Sit e boundaries . B . Othe r Action s t o Dat e 1 . Previou s Action s APreliminar yAssessment/Sit e Investigatio n(PA/SI)wa s complete di n198 4 byth e Uta hDepartmen t o f Environmenta l Qualit y(UDEQ) , wit hadditiona l expande d S I wor k complete di n199 5 an d1996 . I nJul y2000 , EP A liste dth e IS& RSit e o nth e NPL . Durin g th e year s 1986-198 7 Atlanti c Richfiel dperforme d a nextensiv e voluntar yreclamatio na t th e propert yt o contro l potentia l risk s t o healt han dth e environment . Th e reclamatio nwor k included : th e remova l o f remainin g building s an dstructures ; consolidatio no f wast e materials ; constructio no f stor mwate r controls ; and , placemen t o f cove r soi l ove r th e majorit yo f disturbe d area s a t th e Site . 2 . Curren t Action s

Pag e 4 o f 1 0Th e Remedial Investigatio nfo r th e Sit e 'i s currentl y underwa yan d i s schedule d t o b e complete d i nJun e 2003 . Th e Feasibilit yStudyi s estimate d t o b e complet e i n Januar y2004 . Stat e and Loca l Authorities ' Role s UDE Q i s th e suppor t agenc yfo r oversigh t o f th e remedia l investigatio nan d feasibilit ystudya t th e Site . UDE Q wa s activel yinvolve d i nth e preliminar yinvestigations , an d wil l continu e t o pla ya vita l suppor t rol e i nthi s remova l action . Bot hth e Townshi p o f Pin e Canyo nan d th e Count yo f Tooel e ar e awar e an d supportiv e o f th e curren t situatio nan d work . III . THREAT S T O PUBLI C HEALTH OR WELFAR E OR TH E ENVIRONMENT , AN D STATUTOR

Y AN D REGULATOR

YAUTHORITIE S Condition s a t th e Sit e presen t a nendangermen t t o huma nhealt h an d mee t th e criteri a fo r initiatin g a Remova l Actio n unde r 4 0 CF RSectio n300.415(b)(2 ) o f th e NCP . A . Threat s t o Publi c Healt ho r Welfar e Th e followin g factor s fro mSectio n300.415(b)(2 ) o f th e NC P formth e basi s fo r EPA' s determinatio no f th e threa t presented , an dth e appropriat e actio nt o b e taken : (i ) Actual , o r potentia l exposur e t o nearbyhuma n

populations , animal s o r th e foo d chai nfro m hazardou s substance s o r pollutant s o r contaminants ; (ii ) Hig hlevel s o f hazardou s substance s o r pollutant s i n

soil s largel ya t o r nea r th e surface , tha t ma y migrate . (iii ) Weathe r condition s tha t ma ycaus e hazardou s

substance s o r pollutant s o r contaminant s to-migrat e o r b e released . Becaus e th e propert yi nquestio ni s alreadybein g extensivel yuse d a s a recreationa l area , ther e i s a significant , immediat e potentia l fo r exposur e o f huma n populatio nt o unacceptabl e level s o f lea d an d arseni c t o Pag e 5 o f 1 0surfac e soils . Additionally , thes e measure s ar e bein g take n

t o protec t agains t migratio no f contaminant s fro mth e weather-relate dforce s o f win dan d rain . Th e Landfil l cove r i s presentl yerodin g fro mpas t rai nan drun-of f events . I t i s i nimmediat e dange r o f erodin g throug ht o th e underlyin g sourc e material , an dit s integrit ycoul db e compromise dwit h on e larg e stor mevent . I f th e landfil l containmen t i s breache do r compromised , hazardou s substances , includin g lea dan darsenic , woul dmigrat e vi a wate r flo wt o additiona l area s o f th e site . B . Threat s t o th e Environmen t Th e followin g factor s fro mSectio n300.415(b)(2 ) o f th e NC P for mth e basi s fo r EPA' s determinatio no f th e threa t presented , an dth e appropriat e actio nt o b e taken : (i)Actua l o r potentia l exposur e t o nearb yhuma n populations , animals , o r th e foo dchai nfro mhazardou s substance s o r pollutant s o r contaminants . IV . ENDANGERMEN T DETERMINATIO N Actua l o r threatene drelease s o f hazardou s substance s o r contaminant s fro mthi s Site , i f no t addresse db yimplementin g th e respons e actio nselecte di nthi s Actio nMemorandum , ma ypresen t a nimminen t an dsubstantia l endangermen t t o publi c health , welfare , and/o r th e environment . V . PROPOSE D ACTION S AND ESTIMATE D COST S A . Propose d Action s 1 . Actio n descriptio n Th e pla npropose db yARC O an d conditionall yapprove db y EP Aan d UDE Q i s consisten t wit hth e wor k tha t wil l b e performe da t th e Sit e an d include s th e followin g points : a . Car r For k Landfil l Erosio nContro l Construc t a serie s o f earthe ndiversio nberm s designe dt o redirec t flo wo f wate r awa yfro mth e landfill s an dstee p canyo nslope s a s presente di n Figure s 5 an d 6 . b . Entranc e Are a Staine dSoil s Soi l Cove r Plac e a soi l cove r ove r contaminate darea , the n revegetate , a s presente di nFigur e 7 .

Pag e 6 o f 1 0c . Oversigh t Al l wor k wil l b e conducte d concurren t wit hoversigh t byEP Aan d UDE Q an d wit hth e Burea u o f Reclamatio n (BOR ) a s th e oversigh t contractor . 2 . Contributio n t o Remedia l Performanc e T o th e exten t practicable , th e wor k conducte d unde r thi s remova l actio nwil l contribut e t o th e efficien t performanc e o f anyanticipate d long-ter mremedia l action . Thoug hn o ground wate r impact s fro mthi s portio no f th e Sit e ar e suspected , th e remed ywil l minimiz e anyfutur e leachin g o f heavymetal s fro mth e soil s an d woul d b e consisten t wit hanylong-ter mgroun d wate r remedy . 3 . Descriptio n o f Alternat e Technologie s a . Car r For k Landfil l Erosio nContro l (1 ) N o Actio n Althoug hther e has . bee nn o detrimenta l damag e t o th e landfil l t o date , erosio ncontinue s t o progres s towar d th e landfil l fro madjacen t areas . Shoul d th e erosio ncompromis e th e landfill , th e sprea d o f contaminatio ncoul d result . Thi s alternativ e i s no t recommended . (2 ) Backfil l Erosio nGullie s Thi s optio nwoul d provid e temporar yprotectio nfro m release o f landfil l wastes ; however , i t wil l requir e simila r restoratio never yfe wyears . (3 ) Stor mWate r Diversio n Thi s optio nwil l addres s th e caus e o f th e hea d cuttin g erosion . I t i s protectiv e i nth e shor t ter m becaus e ther e ha s bee n n o detrimenta l damag e t o th e landfil l t o date . Thi s alternativ e provide s a mor e permanen t remedya t les s cos t tha nth e backfil l alternative . Thi s i s th e recommende d alternativ e fo r correctin g th e encroachin g erosio na t th e landfill . b . Entranc e Are a Staine d Soil s Soi l Cove r (1 ) N o Actio n Thi s optio nallow s fo r a potentia l windblown pathwa y fo r expose d soil s int o nearbyprojec t safet yshe d area . Sinc e thi s are a i s ofte nfrequente d bySit e visitor s an d workers , thi s optio ni s no t recommended . (2) ' Remova l Pag e 7 o f 1 0

### Thi s optio nwoul dmitigat e th e risk s pose db yth e Sit e wastes , bu t woul dinvolv e extensiv e environmenta l consideration s i nfindin g a permanen t storag e fo r th e remove dsoils . (3 ) Revegetate dSoi l Cove r Thi s i s th e recommende dalternative . Asoi l cove r i s protectiv e i nth e shor t term , an di f wel l maintained , wil l b e protectiv e i nth e lon g term . Thi s alternativ e wil l b e muc heasie r t o implemen t tha nth e remova l remedy . Lastly , a soi l cove r ca n b e pu t int o plac e a t a considerabl ylowe r cos t tha n removal . Therefore , th e recommende dalternativ e fo r th e Car r For k Landfil l Erosio nis Stor mWate r Diversion , andfor the Entranc e Are a Staine dSoil s i s a Revegetate dSoi l Cover . 4 . Engineerin g Evaluation/Cos t Analysi s (EE/CA ) AnEE/C Ai s no t require dfo r thi s action . A s discusse d i nparagrap h3 , thre e option s fo r eac hare a wer e considere dan devaluate dbase do noveral l protectio nt o huma nhealt han dth e environment , shor t an dlon g ter m effectiveness , an d implementability . 5 . Applicabl e o r Relevan t and Appropriat e Requirement s (ARARs ) 

### Thi s remova l actio nwil l attain , t o th e exten t practicable , Federa l and/o r Stat e ARARs , whicheve r ar e mor e stringent . ARC O wil l b e taske dt o provid e a lis t o f ARAR s fo r th e project . 6 . Projec t Schedul e Th e constructio nportio no f thi s remova l actio nwil l b e conducte db yARC O immediatel yfollowin g necessar y approva l byEPA . Thi s shoul doccu r durin g Februaryan d Marc ho f 2003 . Wor k wil l b e complete di nles s tha n twelv e months . B . Estimate d Cost s Th e entir e cos t o f th e remova l wil l b e born e b yARCO , includin g oversigh t costs . Oversigh t wil l b e conducte d primaril ybyBO Ri ncoordinatio nwit hth e EP Aan dUDE Q Remedia l Projec t Managers . Extramura l Costs : Regiona l Remova l Allowanc e Cost :

Pag e 8 o f 1 0

## V '' 

## * Cleanup an dDisposa l . $ 80,00 0

Extramura l Cost s Contingenc y(20% ) $ 20,00 0

TOTAL , REMOVAL PROJEC T CEILING' ' $ 100,00 0

VI . EXPECTE D CHANG E I NTH E SITUATIO NSHOULD ACTIONB E DELAYE D O R NO T TAKE N I f n o remova l actio ni s take no r i f actio ni s delayed , th e followin g scenario s woul d occur . Th e Car r For k Landfil l wil l continu e t o b e eroded , increasin g th e healt hthrea t t o visitor s an d Sit e worker s du e t o th e potentia l fo r exposur e t o hazardou s contaminants . Th e Entranc e Are a Staine d Soil s wil l continu e t o b e a healt hthrea t t o visitor s an d Sit e worker s du e t o th e potentia l fo r exposur e t o windblow nhazardou s contaminants . VII . OUTSTANDINGPOLICYISSUE S Non e VIII . ENFORCEMENT Thi s wor k i s bein g conducte d throug hth e us e o f EP ACERCL A enforcemen t authority . .EP Aintend s tha t ARC O complet e th e wor k unde r th e curren t Administrativ e Order , throug hsubmitta l an d approva l o f wor k pla namendments ; however , a nestimat e o f th e tota l EP Acost s i f neede d fo r thi s remova l actio nbase d o nfull

cos t accountin g practice s ar e estimate d at : Tota l Remova l Ceilin g ' $25,00 0 EPA' s Direc t Intramura l Cost s 10,00 0

Subtota l • $35,00 0 Regiona l Indirec t Cos t (27% ) 9,45 0 Estimate d EP ACost s fo r a Remova l Actio n $44,45 0 Direc t Cost s includ e direc t extramura l cost s an d direc t intramura l costs . Indirec t cost s ar e calculate d base d o na n estimate d indirec t cos t rat e expresse d a s a percentag e o f site

specifi c direc t costs , consisten t wit hth e ful l cos t accountin g methodolog yeffectiv e Octobe r 2 , 2000 . Thes e estimate s d o no t includ e pre-judgemen t interest,-d o no t tak e int o accoun t othe r enforcemen t costs , includin g Departmen t o f Justic e costs . Th e estimate s ar e fo r illustrativ e purpose s only

- an d thei r us e i s no t intende d t o creat e anyright s fo r responsibl e parties . Neithe r th e lac k o f tota l cost s estimate s no r deviatio no f actua l cost s fro mthi s estimat e wil l affec t th e Unite d States ' righ t t o cos t recovery . Pag e 9 o f 1 0IX . RECOMMENDATION S

Thi s decisio ndocumen t represent s th e selecte dRemova l Actio nfo r th e Internationa l Smeltin g an d Refinin g Sit e i nPin e Canyon , Tooel e County , Utah . Th e selecte dRemova l Actio n wa s develope d i naccordanc e wit hCERCLA , a s amended , an d i s no t inconsisten t wit hth e NCP . Thi s decisio ni s base do nth e administrativ e recor d fo r th e Site . Condition s a t th e Sit e me t th e NC P criteri a fo r a remova l se t fort ha t 4 0 C.F.R . sectio n300.41 5 (b ) (2 ) an dw e recommen dyou r approva l o f th e propose dpotentia l PRP-lea dRemova l Action .

Approve : Dat e : 

### 1/2.1

Ma xH . Dodso n Assistan t Regiona l Administrato r Offic e o f Ecosyste mProtectio nan dRemediatio n Attachment s Figur e 1 - Figur e 2 - Figur e 3 - Figur e 4 - Figur e 5 - Figur e 6 - Figur e 7 - Ma p o f IS& RSit e

Detaile dma p o f IS& RSit e showin g bot harea s Samplin g result s fro mSit e Entranc e Staine dSoil s Are a Lis t o f ARAR s Drainag e Area s o f Car r For k Landfil l Are a Diversio nFeature s o f Car r For k Landfil l Are a Soi l Cove r Feature s o f Sit e Entranc e Staine dSoil s Are a

Pag e 1 0 o f 1 0