SDM S Documen tI D

I . HEADIN G DATE : FROM : TO : SUBJECT : POLREP : II . BACKGROUN D FINA L POLRE P

Januar y15 , 199 1 Mik e Zimmerman , OS C Stev e Luftig , Directo r ER D Midval e Sla g Site , Midvale , Uta h Fina l 203809 0

Sit e No : 7 1 D.O . No : 7334-08-04 6 Respons e Authority : CERCL A NP L Status : Propose dNP L Sit e Star t Date : Marc h30 , 199 0 Approva l Status : Actio nMemorandu mha s bee napprove dby th e Divisio nDirecto r Marc h15 , 199 0 Actio nMemorandu mAmendmen t ha s bee n approve do nDecembe r 7 , 199 0 - Ceilin g Increas e III . INCIDENT INFORMATIO N A . Situation : Th e Midval e Sla g Sit e i s locate di nMidvale , Utah , approximatel y1 2 mile s sout ho f Sal t Lak e City . Additionally , th e sit e i s locate dalon g th e Wasatc h Fron t i nth e Jorda nRive r Valley , whic hi s a flat , sediment-file d valle ysurrounde dbyth e fault-bloc k Wasatc hMountains . Portion s o f th e sit e li e i nth e floodplai no f th e Jorda nRiver . Th e sit e consist s o f abou t tw o (2 ) millio nton s o f sla g fro ma forme r coppe r an d lea dsmeltin g facilit yo na n are a o f abou t 33 0 acres . Th e smelte r wa s operate dfro m 190 2 unti l 195 8 byU.S . Smelting , Refining , an dMinin g Company(late r know na s U V Industries) . Ove r th e year s th e smelte r wa s change dfro ma coppe r t o a lea dsmeltin g facilit yproducin g gold-lead-silve r bullio nfro msulfid e ores . Anarsenic-recover yplan t wa s als o par t o f th e smeltin g proces s include dsla g an d dross ; wherea s th e principa l wast e end-produc t o f th e arseni c recover y proces s wa s baghous e dust . Th e volum e o f baghous e dus t an ddros s hav e bee nestimate da t 40 0 an d44,10 0 cubi c yards , respectively . Th e propert ywa s purchase di n196 4 byValle yMaterial s Corporatio n(VMC) , wh o market s th e sla g material s lef t o nsite . Blackhaw k Sla g Product s operate s th e sit e fo r recoverin g an d processin g th e sla g 1

### fo r us e a s material s fo r railroa d bed s an dasphal t

highwa yconstructio nan d a s a sandblastin g abrasive . Th e sit e i s onl ypartiall yfenced . B . Typ e o f Indicent : Fro mprevious smelte r operation s abundan t concentration s o f lead , arsenic , cadium , copper , silver , chromium , ari dzin c ar e containe d i nth e slag , dross , an dbaghous e dus t foun d foun do nsite . Th e primar yconstituent s o f concer nfo r thi s Remova l Actio nar e arseni c an dlea d foun d i nth e dross . C . Preliminar yAssessmen t Results : APreliminar yEndangermen t Assessmen t byth e Agenc yfo r Toxi c Substance s an d Diseas e Registr y(ATSDR ) wa s prepare d fo r EPA . ATSD Rrecommende d complet e restrictio n o f th e sit e du e t o a publi c healt hconcern . EP Aconfirme d th e ATSD R recommendatio ntha t th e sit e shoul d b e fence d base d o nth e hig h.concentration s o f arseni c (+10,00 0 ppm ) an dlea d (+7,50 0 ppm ) withi nth e dros s materia l o nth e surfac e o f th e site . IV . RESPONS E INFORMATIO N A . Statu s o f Action : Subsequen t t o th e star t o f on-sit e activitie s th e projec t EP Aattempte d t o involv e th e prim e PRP , VMC , i nth e Remova l Action . VM C wa s reluctan t t o participate . VM C questione d th e legitimac yo f th e EP Aactio nbase d o nth e assumptio ntha t th e contaminant s wer e no t bio-availabl e t o th e genera l populace . VM C contende d tha t soi l particle s wer e o f a siz e to o larg e fo r ingestio no r absorption . Consequently , EP Aconducte d selectiv e soi l samplin g o nth e sit e o nMa y14-15 , 1990 , t o determin e th e availabilit yo f contaminant s (lea d an darsenic ) throug hsoi l particle s les s tha n10 0 mes hsize . Th e result s o f tha t samplin g effor t wer e tendere d b yTAT o nJul y9 , 19'90 , i nth e for mo f a revise d PE Arecommendin g fencin g o f th e entir e site . EP A toxicologist , Dr . Jame s LaVelle , concurre d wit hth e recommendatio no nSeptembe r 27 , 1990 . I naddition , Matthe wCohn , Offic e o f Regiona l Counsel , conferre d wit hcounse l fro mth e PRP's , an di t wa s agree d tha t EP A woul d no t see k a nAdministrativ e Order , eithe r byConsen t o f Unilateral , t o pursu e th e fencing . Negiotation s wer e sentativ e a t tha t poin t (Augus t 23 , 1990 ) ove r th e pending RI/FS . Th e projec t woul d remai na Fun d Lea d effort . Afina l acces s agreemen t t o th e propert ywa s execute d o nNovembe r 1 , 1990 . ERC S wa s mobilized , i nful l force , t o th e sit e o nNovembe r 7 , 1990 . Constructio nbega ni nernes t a s th e OS C desire dcompletio no f th e fenc e befor e fros t penetration . Overtim e was ;

authorize d fo r ERG S an d th e OS C utilize d th e oversigh t services ; o f BO Rt o monito r th e effor t o f ERCS . Afina l inspectio nwa s conducte d o nDecembe r 11 , 1990 , an dth e fenc e wa s deeme d substantia l complete . Mino r ancilliar yconstructio nwa s complete d subsequen t t o Decembe r 11 , 1990 , an dth e fenc e wa s accepte d by8HWM-E Ro nDecembe r 14 , 1990 . AnACTIO NMEMORANDU MAMENDMEN T fo r fo r a ceilin g increas e wa s initiate d t o cove r th e additiona l unanticipate d cost s du e t o th e prolonge d requiremen t fo r 2 4 hr/da yguar d servic e an d th e accelerate d constructio nschedule . Th e fina l anticipate d cost s ar e a s reflecte d i nth e belo wbudge t figures . B . Nex t Steps : Reconcilatio no f fina l projec t cost s an d preparatio no f OS C Report . IV . COS T INFORMATIO N CURREN T CEILING COS T

T O DAT E ERC S BO R TAT Subtota l Extramura l Cos t Contingenc y TOTAL EXTRAMURA L COS T Intramura l Cost s EPADirec t Cos t EP AIndirec t Cos t TOTA L INTRAMURA L COS T (H Q & Region ) $310,00 0 $25,00 0 $15,00 0 $350,00 0 $12,25 0 $362,25 0 $20,00 0 $30,00 0 $50,00 0 $289,20 0

$22,50 0 $13,00 0 $324,70 0 $324,70 0 $20,00 0 (Est ) $30,00 0 (Est ) $50,00 0

TOTAL PROJEC T BUDGE T $425,25 0 $374,70 0

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