UNITE D STATE S ENVIRONMENTA L PROTECTIO N AGEN C . REGIO N VII I 99 9 18t h STREE T- SUIT E 50 0 DENVER , COLORAD O 80202-246 6 52295 1
Ret : EPR-S R

I . HEADIN G Date : Subject :
From : FINA L POLLUTIO N REPOR T

CALIFORNI AGULCH , OPERABL E UNI TI V
Jun e 30 , 199 8 SDM S Documen t I D 32355 0 FILE NUMBE R 

# DOCUMEN T Californi a Gulc h Superfun d Site , Operabl e Uni t IV , Non-Tim e Critica l Remova l Actio n fo rth e Garibald i Min e Sit e Withi n Uppe rCaliforni a Gulch , Septembe r1995
. Rebecca Thoma s Remedia l Project Manage r 

### To : Ma

xH
. Dodso n Assistan tRegiona l Administrato r Offic e o fEcosystem s Protectio n an d Remediatio n POLRE P No. : POLRE P 1 & FINA L BACKGROUN D NP LStatus : Sit e No. : Actio n Memorandu m Status : Categor yo fRemoval : Star tDate : Demobilizatio n Date : Completio n Date : Fina l NP L COD98071793 8 Approve d Augus t 4 , 199 5 Non-Tim e Critica l Septembe r22 , 199 5 _fl^ li - A R CKSIT E Novembe r22,199 5 JrPOS TDECISIO N PUBLI C DOCUMEN T D PRIVILEGED/CLAI M D FOI AEXEMPT/CLAI M January , 199 6 D WOR KPERFORME D DOCUMEN T CONTRAC T*
. , FIL E PLA N # ?.O Y KEYWOR D «(S ) / 3Il l SIT E INFORMATIO N

Th e Californi a Gulc h sit e (Site ) wa s liste d o n th e Nationa l Prioritie s Lis t o n Septembe r8 , 1983
. Th e sit e i s i n a histori cminin g are a coverin g 1 6 V z square mile s o fa watershe d that drain s alon g Californi a Gulc h t o th e Arkansa s River
. Startin g i n 1859 , th e are a wa s mine d extensivel yfo rgold , lead , silver , copper , zinc , an d manganese . Si ximpounde d tailing s dump s surroun d th e cityo fLeadville , Colorado
. Man ysmelters , locate d aroun d th e City , processe d silver , lea d an d zin c atvariou s times
. Heav ymeta l residue s are presen t i n much ofth e Site
. Approximatel y7,40 0 peopl e liv e i n Leadvill e an d Lake County
. Operabl e Uni t 4 o fth e Californi a Gulc h Superfun d Sit e i s define d a s th e are a hydrologicall ydraine d b yCaliforni a Gulc h fro m immediatel yupstrea m o fth e Ya k Porta l t o th e headwaters o fth e Gulch
. Th e are a cover s approximatel y2. 4 square mile s an d contain s min e wast e piles , mil l tailing , an d fluvia l tailin g material
. The Non-Time

Critical Removal

Action for the Garibaldi

Mine Site within Upper California Gulch is described

in an Action Memorandum

dated August 4, 1995. The document

is entitled: Request

for Removal

(Response)

Action at the California Gulch Priorities List Site, Leadville, Colorado: ACTION

MEMORANDUM

for a PRP Financed Removal

Action at the Garibaldi

Mine Site, Operable

Unit 4. IV . RESPONS E INFORMATIO N A . Situatio n 1 . Curren t Situatio n Th e Remova l Actio n bega n o n Septembe r22 , 199 5 an d wa s complete d o n Novembe r2 , 1995
. Th e purpos e o fthi s Remova l Actio n wa s t o reduce th e ris k t o th e aquati c an d terrestria l ecosystem s b yreducin g th e releas e o fcontaminate d material s fro m th e Garibald i Min e site
. Th e scop e o fth e Remova l Actio n include d th e followin g elements : 1. 1 Constructio n o fa porta l flo wcollectio n syste m t o capture porta l flo w an d diver

t i t aroun d th e wast e roc k pile
.

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Paper1. 2 Constructio n o fgrass-line d an d concrete-line d ditche s t o diver t run offaroun d th e wast e roc k pile
. 1. 3 Constructio n o fripra p outle t structure . 1. 4 Constructio n ofditc h crossing
. 1. 5 Constructio n o ftw o intercepto rtrenche s t o collect shallo walluvia l flo wan d divert i t aroun d th e wast e roc k pile
. Thi s Remova l Actio n i s describe d i n a repor t entitled : Remova l Actio n Completio n Repor

t fo rGaribald i Min

e Sit e Withi n UpperCaliforni a Gulch , Operabl e Uni

t 4 , January , 1996
. 2 . Remova l Activitie s - Complete d Thi s i s th e firs t Remova l Actio n at O U 4 o fth e Californi a Gulc h Site
. 2. 1 ARemova l Actio n i n O U 4 involvin g th e diversio n o fUppe rCaliforni a Gulc h wa s performe d i n th e fal l o f1996
. Th e actio n wa s addresse d i n a n Actio n Memorandu m date d Octobe r31 , 1995
. Th e Remova l Actio n ha s bee n addresse d i n a separat e POLREP
. 2. 2 ARemova l Actio n i n O U 4 wa s performe d at th e Agwal t Min e i n White s Gulch , i n th e fal l of1996
. Th e actio n wa s addresse d i n a n Actio n Memorandu m date d Jul y19 , 1996
. Th e Remova l Actio n ha s bee n addresse d i n a separat e POLREP
. A n Actio n Memorandu m Amendmen t date d Novembe r18 , 199 6 delete d th e remova l actio n tha t ha d bee n planne d fo rWast e Roc k Pil e UCG-92 Ai n th e Jul y19 , 199 6 Actio n Memorandum
. 3. 0 Enforcemen t Pursuan t to th e 1994 Consen t Decree , Resurrectio n Minin g Compan y ha s agree d t o implemen t respons e action s fo rth e O U 4 portio n o fth e Site
. B . Planne d Remova l Activitie s

N o othe rremova l action s are planned
. C . Next Step s

C.1 AFinal

Focused

Feasibility

Study, Upper

California

Gulch,

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PaperOperabl e Uni t 4 was issue d i n Januar y1998
. Th e Propose d Pla n fo rUppe rCaliforni a Gulc h O U 4 wa s release d fo rpubli c commen t o n Januar

y15 , 1998
. C. 2 Th e Recor

d ofDecisio n fo rOperabl e Uni t 4 ofth e Sit e wa s issue d i n March , 1998
. Remedia l Desig n i s schedule d fo r completio n o n Jul y31 , 1998
. Planne d star t fo rRemedia l Actio n i s mid-Augus t wit h completio n i n 1999
. D . KeyIssue s

Th e Remova l Actio n at th e Uppe rCaliforni a Gulc h i s par t o fth e overal l remedia l activitie s bein g undertake n i n Operabl e Uni t 4 (O U 

### 4)
. Remova l alternative s t o directl yremediat e surfac e wate ro r groundwate ri n th e vicinityofUppe rCaliforni a Gulc h are beyon d th e scop e o fth e Remova l Action
. V . COS TINFORMATIO N

Resurrectio n Minin g Compan yi s th e partythat ha s agree d t o implemen t respons e action s a tO U 4 o fth e Site
. VI . DISPOSITIO N O F WASTE S

N o waste s wer e dispose d o foff-site
.

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Paper