## - 4009I;

j SUMMAR Y CC?| ; ftV,^. ; CALIFORNI A GULC H &£»€CIA L tt\f£STI.6ATlON/FEASIBIIIT

Y STUD Y U

. S

. E8VIROSSCI4TAL PROTECTIO N AGENCY

, REGIO N VII I SUPEfiFUN U PROGRA M OBJECTIVE : 

### T h e objectiv e o f th e remedia l Investigatio n i s t o asses s problem s resultin g fro m »in e drainag e a t th e Californi a Gulc h sit e an d t o provid e tfeta neede d fo r th e identification
, screening , evaluation
, an d desig n o f a remedia l program * Th e feasibilit y stud y will
, through us e o f thes e eata , resul t i n th e determinatio n o f th e mos t cost-effectiv e remedia l actio n fo r thi s site

. Th e stud y wil l als o conside r th e feasibility o f combinin g drainag e fro ® Californi a £yle h an d Lesdvllle Tunnel

. Californi a Gulc h originate s o n th e wes t flan k o f th e Hosqulte Range

. I t fl€» s fres a a n altitud e o f 11,600 fee t as! , approxteatel y 7.2 5 mile s t o th e sses t fe*ier e I t join s th e Arkansa s Rive r & t a n altitud e e f approximate] > S,52 0 fee t JBSJ

, Californi a Sulc h flow s throug h th e souther n portio n o f th e histori c Leadvlll e minin g distric t an d rws jus t sout h o f th e C1t, y o f LeadvUle an d nort h o f Strl>ofcn

, Colorado

. Sujseroy s abandonet i tailing s an d hast e pile s ere loeate a G O th e watersheo ! am i alon g th e stream

. Ther e are severa l ol d tailing s pond s ir < th e gulch

. Al l o f thes e ar e fille d wit h sediment * Th e Ya k Turmgl
, a min e drainag e tunnel
, discharge s acid sine wate r Int o Californi a Sulc h approximatel y 2-1/ 2 stile s downstrea ® fro m th e hea d o f th e giilch

. Th e tunne l drain s grountlwate r fro m numerou s mint s eas t o f Leaoville

. Hos t o f thes e wine s am Inactive

. T h e Yak Tunne l discharge
, whic h account s fo r a significan t portio n o f th e fie * 1r » Californi a Suleh

, I s characterize d a s a } m p H g>1n e dralMf e wit h hig h concentratio n o f heav y sietals

. Californi a 6ulcft>;1tself » 1s essentiall y devoid o f an y fis h o r macrolnvertebrat e populations

. Seriou s impact s o n th e aquati c ecosyste m ar e als o apparen t I n that reac h o f th e Arkansas Rive r bele w th e mout h o f Californi a laulch

. Mate r 1 $ diverte d fre m th e Arkansa s feele* ? th e aiout h o f Californi a Sule h fo r tfe e Irrigatio n o f agricultura l laud s alon g th e river

. T h e metal s conten t (particularl y zin c an d cadmium ) sa y caus e problem s wit h livestock grazin g OB lau d Irrigate d wit h thi s water

.Reme

o 1 a 1 1 nves t \ ga t 1 o n : 1

. £ x 1 s 1 1 R ^ ffi t a Co l 1 ec t f o n am i Eya J u& t 1 o n . Existing dat a en d informatio n o n th e Californi a Gulc h sit e wil l b e collecte d an d evaluated

. 06t a source s Incit e minin g companies , th e U

. S

. Burea u o f Reclamation

, t h e U

. S

. Burea u o f nines , th e Stat e Engineer s Office
, an d th e U » S

. Geologica l Survey

, 2

. Site Healt h .and
, Safety

. Assfessffient

. A sit e healt h an d safet y assessment rHTB e prepare d t o identif y an y cmsit e area s wher e exposur e t o potentiall y hazardous substance s i n the water , ai r o r soi l Ke y b e a problem

. Warning s am i safeguard s will b e prescribe d fo r onslt e Investigator s & m workers

. Th e ple n wil l als o Includ e informatio n t o aler t personne l t o physics ! hazard s relate d t o Inactiv e minin g operation s tha t sse y b e encountere d o n t m site

. 3

. Qualit y Assurance/Qualit

y Control * A qualit y assurance/qualit

y contro l plan " win W prepare d fo r th e sampling
, laboratory analysis
, sn c dat a handling aspect s o f th remedia l investigation

. 4

. Californi a Su l ef t and

. Arkansa s Rive r Alluvia l Aquife r Investigation

. 

### T h e ootentiar?w"1:olfi£i^iii ^ portion s o f th e Arkansas Rive r Valle y will b e studied

. A determinatio n wil l b e asao e on tl^ exten t o f contajE- 1 nation , contaminant types * am ! source s o f corit«8ai natio n am ? grouneweta r flo w directions

. Thi s effor t wil l Involv e th e following : A

. Ar r inventor y o f existin g wells
, B

. Preparatio n o f a monitorin g wel l networ k Includin g existin g well s a m i ne w monitorin g well s ths t ar e drille d fo r thi s project

. C

, Samplin g will be done ove r a one-yea r perio d t o obtai n Informatio n o n seasona l variation s 1 n groundwate r qualit y an d flow

. 5

. A$ r 1 c u 1 1

. u r a . 1 Iffipact s
. Concentrations o f heav y jaet&ls i n crop s an d livestoc k wil l b e meesured

. Agricultura l land s 1 n th e Arkansa s Rive r Vulle y free ? tb g confluenc e o f th e leadville Drainag e Tunne l dosvustreeff i t o Kob e wil l be A

. A aia p o f agricultura l operations and a detaile d agricultura l 

### monitorin g pls n wil l b e prepared

. 8

. Thre e agricultura l monitorin g site s o n the Arkansa s Rive r wil l b e used * on e reejeve d fros ; th e influenc e o f minin g activitie s t o sho w backgroun d conditions
, and tw o locate d downstrea m o f the confluenc e o f th e Californi a Sttle h an d th e Arka«s§ s Rive r **11 1 b e used

. 

### C

, Samplin g o f water , soils
, plants
, an d aniiaa l tissts e wil l fe e conducted

.6

, V,^l^fteJ

r ..pJ^j^jfc t rg^.

r Ho*lJ^IJU!!S

« Tt e discharg e frou ? th e Ya k Tunne l will fe e monitore d ove r a one-yea r period

. Th e flo w rat e wil l b e measure d continuousl y tistrs g a flum e an d periodi c sampling o f th e chemica l water qualit y will b e done

. ? * C&l l f c y n 1 a Sal c h Hon 1 to r 1 n g . Californi a Gulc h will b e Monitore d i n 

### order t o determin e th e aegi s ftSd e o f th e pollutan t leadin g fro m th e ts N Tunne l compare d wit h othe r source s bot h ttpstrea © ami downstrea m o f the Ya k Tunnel
, Thre e fly»e s *dl l b e Installe d t o measur e flo w volumes am i periodi c samplin g o f th e chemical qualit y o f th e wate r wil l be den e fo r a one-yea r period
, 

### $

. Analysi s o f jNln e Tailing s Pile s ait d ponclg

. Itln e tailing s pile s an d porass " tha t ar e locate d fcetwier i th e "Yak " Tunne l an d leativill e te-il l b e 

### studie d t o ditemin e 1 f metal s ar e bein g leached
, 1 f telling s poru i dain s ar e stabile
, an d i f there i s a potentia l fo r washou t o f tailing s durin g flooding

. A

. Tailing s pile s en d pond s wil l b e mapped

. B

. A groundwate r monitorin g ple n wil l fe e prepare d fo r th e tailing s area . Thi s wil l includ e th e Installatio n o f approximatel y I S $ells
, 

### Chemica l analysi s wil l b e clon e O R tailing s an d o n groundwate r samples
, 

### C

. A n investigatio n will b e mad e on th © stabilit y o f dam s and on the potentia l fo r washou t o f tailing s durin g floods

. Feasibilit y Study : * • Effluen t limitation

. Developrngrit

, Effltj^n t discharg e reqyi regent s will 

### be <ievelope d fo r th e discharg e o f treate d acic f min e drainag e Int o th e Arkansas River

, Thes e wil l defin e th e leve l o f treatment o f water that 

### wiilo * b e necessar y t o protec t designate d use s o f the Arkansa s Rive * (such a s irrigatio n and fishery)
, 

### 2

. Initial

. Screenin g o f Alternatives

. Alternat e remedia l fseasure s ^-11 1 b e deWl'6"p'ed''"eW

r s"crieriid"

. fhTs^wlt T includ e treftHeten t o f eci d mine dralnecj e usin g variou s treatmen t method s a s fce U a s othe r aethOG S t o control conta» 1 natio n profelems * I f problem s ar e 1 den t i f le d durin g th e remedia l investigatio n ^or k involvint j t&iling s pile s an d ponds
, remedia l 

### measure s wil l b e develope d an d screene d fo r thi s componen t o f the project

. 

### 3

. Detaile d Evaluatio n o f Component s o f RgBqM.al

. flans

. A treatmen t a l ternst i v e wou l d c e fcroke n "int o 'compone n ts " fo r eVal ua t i o n including : A * Benc h scal e test s o f alternativ e treatment processes , testin g 

### treatmen t processe s under laborator y condition s usin g sample s o f aiin e 

### drainag e take n fro m Californi a Gulch

.

« • 3 * *S

. Sitin g o f a treatment facility

. Site s wuld b e fowm ! takin g int o accoun t geotechnic stability
, availabilit y o f utilities
, flcoctplair j 

### avoitkRce

, topographi c compatibilit y wit h ttaiue l outlets
, require d 

### lan d area , slt t access * am i compatibilit y wit h existin g an d planne d us e regulations

. C

. Developmen t o f a sludg e proces s in g an d disposa l methocs anc l disposa l locations

. 

### 4

. Iteiaedla l Alternativ e Evaluation

, Usin g component s tha t iser e f&mti t o be f easlM e a l 'ttrnat S vi e " 'plaW wl IV " be develope d t e cov^ * il l aspect s o f 

### th e rtBgdU l effor t a t sites

. Eac h rw<e31i l alternativ e ferU l be describe f e y a schematic
, tt e desig n I>as1s 9 

### sizin g c f units , estimat e capita l cost , operetier * sn d tEalntensnc e costs , a staffin g plas
, a n evaluatio n o f operabtlit y an d reliabilit y factors
, an d m snviroriBienta l impac t 

### assessment

. 5

. Alfciras t 1 ,ys.
. ..Seleet l e n an ^ C.Q|iC f Ptmj^Jte s j$n

r , A o dlterrsativ e &11 1 b e 1 

### ""'''"

- Wi : »«OTHEN«EYER:hjp:ll-7-83:6238:4852 A~

SUMMAR Y
— 40092 ^ CALIFORNI A GULC H REMEDIA L INVESTIGATION/FEASIBILIT

Y STUD Y U

. S

. ENVIRONMENTA L

PROTECTIO N AGENCY

, REGIO N VII I SUPERFUN O PROGRAM NOVEMBE R 7 , 198 3 OBJECTIVE : T h e objectiv e o f th e remedia l investigatio n i s t o assess problem s resultin g fro m min e drainag e a t th e Californi a Gulc h sit e an d t o provid e dat a neede d fo r th e identification
, screening , evaluation s an d desig n o f a remedia l program

. Th e feasibilit y stud y will
, throug h us e o f thes e data
, resul t i n th e determinatio n o f th e mos t cost-effectiv e remedia l actio n fo r thi s site

. Th e stud y will als o conside r th e feasibilit y o f combinin g drainag e fro m Californi a Gulc h an d Leadvill e Tunnel

. BACKGROUND : Californi a Gulc h originate s o n th e wes t flan k o f th e Mosquit o Range

. I t flow s fro m a n altitud e o f 11,60 0 feet
, approximatel y 7.2 5 mile s t o th e west wher e it join s th e Arkansa s Rive r a t a n altitude o f approximatel y 9 S 5 2 0 feet

. Californi a Gulc h flow s throug h th e souther n portio n o f th e histori c Leadvill e minin g distric t an d run s jus t sout h o f th e Cit y o f Leadvill e an d nort h o f Stringtown

, Colorado

. Numerou s abandone d tailing s an d wast e pile s ar e locate d o n th e watershe d an d along th e stream

. Ther e ar e severa l ol d tailing s pond s i n th e gulch

. Al l o f thes e ar e fille d wit h sediment

. Th e Ya k Tunnel
, a min e drainag e tunnel
, discharge s aci d min e wate r int o Californi a Gulc h approximatel y 2-1/ 2 mile s downstrea m fro m th e hea d o f th e gulch

. Th e tunne l drain s grounciwate r fro m numerou s mines eas t o f Leaaville

. Mos t o f thes e mines ar e inactive

. T h e Ya k Tunne l discharge
, whic h account s fo r a significan t portio n o f th e flo w i n Californi a Gulch

, i s characterize d a s a lo w p H min e drainag e wit h hig h concentratio n o f heav y metals

. Californi a Gulch

s itself
, i s essentiall y devoi d o f an y fis h o r macroinvertebrat e populations

. Seriou s impact s o n th e aquati c ecosyste m ar e als o apparen t i n tha t reac h o f th e Arkansa s Rive r belo w th e mout h o f Californi a Gulch

. Wate r i s divertet i fro m th e Arkansa s belo w th e mout h o f Californi a Gulc h fo r th e irrigatio n o f agricultura l land s along th e river

. T h e metal s conten t (particularl y zin c an d cadmium ) ma y caus e problem s wit h livestoc k grazing o n lan d irrigate d wit h thi s water

.Remedia l

Investigation : i * Existin g Dat a Collectio n an d Evaluation

. Existin g dat a an d informatio n o n th e Californi a Gulc h sit e wil l b e collecte d an d evaluated

. Dat a sources includ e minin g companies , th e U

. S

. Burea u o f Reclamation

, t h e U

. S

. Bureau o f Mines
, th e Stat e Engineer s Office.
, an d th e U
, S

, Geologica l Survey

. 2

. Site

, Health an d Safety Assessment

. A sit e healt h an d safet y assessmen t wil l b e prepare d t o identif y an y onsit e area s where exposur e t o potentiall y hazardou s substance s in th e water , air o r soi l ma y be a problem

. Warning s an d safeguard s wil l b e prescribe d fo r onsit e investigator s an d workers

. Th e pla n wil l als o includ e informatio n t o aler t personne l t o physica l hazard s relate d t o inactiv e minin g operation s tha t ma y b e encountere d on the site

. 3

. Qua!it y Assurance/Qualit

y Control

. A qualit y assurance/qualit

y contro l pla n wil l b e prepare d fo r th e sampling s laborator y analysis
, an d dat a handlin g aspect s o f th e remedia l investigation

. 4

. Cali f orn. 1 a Gti.lcii

. an d Arkansa s Rive r Allu v 1 a l Aquife r Investifla t 1 on . T h e potentia l fo r contaminatio n o f groundwate r i n Californi a Gulc h an d portion s o f th e Arkansa s Rive r Valle y wil l b e studied

. A determinatio n wil l b e mad e o n th e exten t o f contamination , contaminan t types , an d source s o f contaminatio n an d groundwate r flo w directions

. Thi s effor t wil l involv e th e following : A

. a n inventor y o f existin g wells ; B

. preparatio n o f a monitoring wel l network includin g existin g wells a n d ne w monitoring wells tha t ar e drille d fo r thi s project ; an d C

. samplin g ove r a one-yea r perio d t o obtai n informatio n o n seasona l variation s i n groundwate r qualit y an d flow

. 5

. Agr1cu1tura 1 Impacts

. Concentration s

o f heav y metal s i n crop s an d livestoc k wil l b e measured

. Agricultura l land s i n th e Arkansa s Rive r Valle y fro m th e confluenc e o f th e Leadvill e Drainag e Tunne l downstrea m t o Kob e wil l b e studied

. A

. A ma p o f agricultura l operation s an d a detaile d agricultura l monitorin g pla n will b e prepared

. B

. Thre e agricultura l monitorin g site s o n th e Arkansa s Rive r will be used
, on e removed fro m th e influenc e o f minin g activitie s t o sho w backgroun d conditions
, an d tw o locate d downstrea m o f th e confluenc e o f th e Californi a Gulc h an d th e Arkansa s Rive r wil l b e used

. C

. Samplin g o f water , soils
, plants
, an d anima l tissu e wil l b e conducted

.U N DSTATE S ENVIRONMENTA L

PROTEC T 'AGENC Y

6

. Ya k Tunne l Discharg e Monitoring

. Th e discharg e fro m th e Ya k Tunne l wil l b e monitore d ove r a one-year period

. Th e flo w rat e wil l b e measure d continuousl y usin g a flum e an d periodi c samplin g o f th e chemica l wate r qualit y wil l b e done

. 7

. Californi a Sulc h Monitoring

. Californi a Gulc h will b e monitore d i n orde r t o determin e th e magnitud e o f th e pollutan t loadin g fro m th e Ya k Tunne l compare d wit h othe r sources bot h upstrea m an d downstrea m o f th e Yak Tunnel

. Thre e flume s wil l b e installe d t o measure flo w volumes an d periodi c samplin g o f th e chemica l qualit y o f th e wate r wil l b e don e fo r a one-year period

. 8

. Analysi s o f Min e Tailing s Pile s an d Ponds

. Min e tailing s pile s an d pond s tha t ar e locate d betwee n th e Ya k Tunne l an d Leadvill e wil l b e studie d t o determin e i f metal s ar e bein g leached

9 i f tailing s pon d dam s a r e stabile
, an d i f ther e i s a potentia l fo r washou t o f tailing s durin g flooding

. A

. Tailing s pile s an d pond s wil l b e mapped

. B

. A groundwate r monitorin g pla n wil l b e prepare d fo r th e tailing s area . This wil l includ e th e installatio n o f approximatel y 1 5 wells

. Chemica l analysi s wil l b e don e o n tailing s an d o n groundwate r samples

. C

. A n investigatio n wil l be mad e o n th e stabilit y o f dam s an d o n th e potentia l fo r washou t o f tailing s durin g floods

. Feasibilit y Study : 1

. Effluen t Limitatio n Development

. Effluen t discharg e requirement s wil l b e develope d fo r th e discharg e o f treate d acid min e drainag e int o th e Arkansa s River

. Thes e will defin e th e leve l o f treatmen t o f water that woul d b e necessar y t o protec t designate d use s o f th e Arkansa s Rive r (suc h as irrigatio n an d fishery)

. 2

. Initia l Screenin g o f Alternatives

. Alternate remedia l measures wil l b e develope d an d screened

. Thi s wil l includ e treatmen t o f aci d min e drainag e usin g variou s treatmen t method s as wel l as othe r method s t o contro l contaminatio n problems

. I f problem s ar e identifie d during th e remedia l investigatio n wor k involvin g tailing s pile s an d ponds
, remedia l measure s wil l b e develope d an d screene d fo r thi s componen t o f th e project

. 3

. Detaile d Evaluatio n o f Component s o f Remedia l Plans

. A treatmen t alternativ e woul d b e broke n int o component s fo r evaluatio n including : A

. Benc h scal e test s o f alternativ e treatmen t processes , testin g treatmen t processe s unde r laboratory condition s usin g sample s o f min e drainag e take n fro m Californi a Gulch; f

SYMBO L ^ SURNAME

7 k DAT E b CONCURRENCE S

- 3 - E P A For m 1320 0 (12-70 ) OFFICIA L FIL E COP YU

N D STATE S ENVIRONMENTA L PROTEC T AGENC Y
8

. sitin g o f a treatmen t facility

. Site s woul d b e foun d taking int o accoun t geotechni c stability
, availability o f utilities
, floodplai n avoidance
, topographi c compatibilit y wit h tunne l outlets
, require d lan d area, sit e access , an d compatibilit y wit h existin g an d planne d lan d us e regulations ; an d C

. developmen t o f a sludg e processin g an d disposa l method s an d disposa l locations

. 4

. Remedia l Alternativ e Evaluation

. Usin g component s tha t wer e foun d t o b e feasibl e alternativ e plan s wil l b e develope d t o cove r al l aspect s o f t h e remedia l effor t a t sites

. Eac h remedia l alternativ e wil l b e describe d b y a schematic

. Th e desig n basis
, sizin g o f units , estimate d capita l cost , operatio n an d maintenanc e costs , a staffin g plan
, a n evaluatio n o f operabilit y an d reliability factors
, an d a n environmenta l impac t assessmen t wil l b e include d fo r eac h alternative

. 5

. Alternativ e Selectio n an d Conceptua l Design

. A n alternativ e wil l b e se1ecte d an d a conceptua l desig n wil l b e prepared

. a p t T T T

CQNCURRJE.NCE S SYMBO L ^ SURNAM E | DATE } > 

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................. . .................. . ................. . E R A For m T32< W ( T 2-^0 ) OFFICIAL FIL E COP Y4 0 0 i u L .CALIFORNI A 6ULCH ROOiA L iSy£STieATiai/F£ASIfeILIT

Y STUft Y U » S

. £«yiRONf€KTA L PROTECTIO N ASENCY

, RESIG N VII I SUPERFUN D PROGRA M NOVEMBE R 7 , 198 3 

### T h e objectiv e o f th e remedia l investigatio n 1s t o assess preplan s resultin g fres i sin e drainag e a t th e Californi a Gulc h sit e an d t o provid e dat a neede d fo r th e Identification
, screening , evaluation
, an d desig n o f a remedia l program

. Th e feasibilit y stuo y will
, through us e o f thes e data
, resul t i n th e 

### determinatio n o f th e mos t cost-effectiv e remedia l actio n fo r thi s site

. Th e stud y wil l als o conside r th e feasibilit y o f combinin g drainag e fros i Californi a Gulc h an d Leadvill e Tunnel

. 

### Californi a Gulc h originate s o n th e wes t flan k o f th e Mosquit o Range

. I t flow s fra a a n altitud e o f 11,60 0 feet
, approximatel y 7.2 5 mile s t o th e wes t 

### wher e i t join s th e Arkansa s River a t a n altitude o f approximatel y 9,52 0 feet

. Californi a Sulc h fJo*? s throug h th e souther n portio n o f th e histori c Leadvill e minin g distric t an d run s jus t sout h o f th e Cit y o f Leedvllle an d nort h o f 

### Stringtown

, Colorado

, Numerous abandoned tailing s an d wast e pile s ar e locate d o n th e watershe d an d alon g th e strtaro

. Ther e ar e several ol d tailing s pond s i n th e gylch

. Al l o f thes e ar e fille d wit h sediment

. Th e Ya k Tunnel
, a sin e drainag e tunnel
, discharge s aci d min e water int o Californi a Gulc h 

### approximatel y 2-1/ 2 wile s downstrea m fro m th e hea d o f th e gulch

. Th e tunne l drain s groundwate r fro m numerou s ©ine s eas t o f Leadville

. Mos t o f thes e mine s are inactive , T h e Yak T«ine l discharge
, whic h account s fo r a significan t portio n o f th e flo w i n Californi a Gulch

, I s characterize d a s a lo w p K min e drainag e wit h hig h concentratio n o f heav y esetals

. Californi a Gulch

, itself
, is essentiall y devoi d o f any fis h o r raacrol n vertebrat e populations

. Serious impact s on the aquati c ecosyste m are 

### als o apparen t i n that reac h o f th e Arkansas Rive r belo w th e mout h o f Californi a Sulch

. Mate r 1 s diverte d frot a th e Arkansa s belo w th e taout h o f 

### Californi a Stilc h fo r tfe e Irrigatio n o f agricultura l land s alon g th e river

. T h e metal s conten t {particularl y zin c an d cadmium ] ma y caus e problem s wit h livestoc k grazin g o n lan d irrigate d wit h thi s water

.ftettedia i

Investigation : 1

. £x i stin g Oa t a Co l 1 ec t 1 o n en d Ev a 1 ua t 1 o n , Existin g dst s an d Informatio n e n th e Californi a Gulc h sit e wil l b e collecte d an d evaluated
, 

### 0et a source s includ e minin g coapsfiles
, th e U

. S

. Burea u o f Reclamation

, t h e u . S

. Burea u o f H1nes
, th e Stat e Engineer s Office
, an d th e U

. S

. S e o logica l Survey

. 2

. Sit e Healt h &m 3 Safet y Assessment

. A sit e healt h en d safet y assessment wil l be prepare d t o Identif y an y cnslt e area s wher e exposur e t o potentiall y hazardous substances I n the water , i1r o r soi l ma y b e & problem

. Earning s a«t l safeguard s will b e prescribe d fo r onslt e Investigator s an d workers

. Th e pla n wil l als o Includ e Informatio n t o aler t personne l t o physica l hazard s relate d t o Inactiv e minin g operation s 

### tha t ma y b e encountere d o n th e site

. 3

. .Qua. ! 1t y Assuranee/j^ua l it y ; Contro l

. A qualit y assurance/Qualit

y contro l pla n wlY l b e priEpare S '"T^The ^ sampling
, laborator y analysis
, an d dat e handling aspect s o f th e remecHa l investigation , 4

. Californi a iulc h JMKJ
, Arkansa s Riw r Alluvia l Aquifer

. Inves t 1 oa t 1 en . T h e potentia l fo r contatn l natio n o f grou^^tier'''! ^ Calif Grnl¥<&uTe h sn d portion s o f th e Arkansa s 81ver Valle y wil l b e studied

. A determinatio n 

### wil l b e mad e o n the exten t o f contaia l nation , contemlnen t types , and source s o f ecmtami natio n an d grounewate r flo w directions

. This effor t Involv e th e following : A

. a n Inventory o f existin g wells ; 8 , preparatio n o f & r«oRltoriti § wel l networ k Inducing existin g well s a n d ne w monitorin g well s that ar e drille d fo r till s project ; an d C

. samplin g ove r & one-yea r perio d t o obtai n Informatio n o n seasona l variation s I n groyndwate r qualit y an d 

### S « Agrici O t ur a 1 tei^act s
. Concentration s o f heav y metal s I n crop s anc s llvestbcl k wil l "b e measured

. Agricultura l land s i n tlt e Arkansa s R1w r Valle y from th e confluenc e o f th e LeacSvlll e drainag e Tunne l downstre^ B t o Kob e wil l b e studied

. A
, A ma p o f agricultura l operation s «m i a detaile d agricultura l gjQfi1tor1r» g ple n will b e prepares , E

. Thre e agricultura l jaonltorlRc j site s o n th e Arkansa s Rive r wil l be 

### used * on e remove d fro m th e Influenc e o f minin g activitie s t o sho w backgroun d condition s » arw i two locate d downstrea m o f the o f the Californi a 6«lc h an d the Arkansg s Rive r i«11 1 b e C

. Samplin g o f water , soils
, plants
, an d animal tissu e will b e conducted

.f c

.

Yak

. Jwnel

_ Discharg e Hor n to r i n g . Th e discharg e fro m th e Ya k Tunne l wil l b e monitore d ove r a one-yea r period

. Th e flo w rat e will b e measured continuousl y usin g a fltan e an d periodi c samplin g o f tfc e chemica l wate r qualit y wil l b e done

. 7

. Ca l i f orn l a fe u lef t Hon

n itgjr J ng . Californi a Gulc h wil l b e raonitore c i n orde r t o determin e th e magnitud e o f th e pollutan t loadin g fro m th e Yak Tunne l ccispsre c wit h otne r source s bot h upstrea m an d downstrea m o f tri e Ya k Tunnel

. Thre e flume s wil l b e installe d t o measur e flo w volume s an d periodi c samplin g o f th e chemica l qualit y o f th e weter wil l be done fo r a one-yea r period
,

- -.,ff/

. ffiM R J a X^l n M fil^ 5 « f M Ponds * Win e tailing s pile s an d pond s the t ar e locate d betwee n th e Yak Tunne l en d Leadvill e wil l b e studie d t c determin e i f roetal s er e bein g leao'iett g i f tailing s pond tiara s a r e stabile
, an d I f ther e is a potentia l fo r washou t o f tailing s durin g flooding

. A

. Tailing s pile s an d pond s wil l b e mapped

. 8

. A groundwfite r fnonitoring pla n will b e prepare d fo r th e tailing s area . Thi s wil l includ e th e installatio n o f approximatel y 1 5 wells

. Comica l analysi s wil l be done o n tailing s an d o n groundwate r sewples
,

. A n investigatio n wil i b e mad e o n th e stabilit y o f c'asa s an d o n tft e potentia l fo r Kasmsu t o f tailing s durin g floods

. Feasibilit y Study : 1

. Effluen t timltatior i Ijeveloptaent

. Effluen t tilssherg e requirement s wil l be develope d fo r th e discharg e o f treate c acid mine drainag e int o th e Arkansas River

. Thes e wil l defiri e th e leve l o f treatmen t o f wate r that woul d be necessar y t o protec t designate d use s o f th e Arkansa s Rive r (suc h as irrigatio n an d fishery)

. 2

. --- 6 5 *

Alternate remedia l measure s wil l

. b e develope d an d screened

. Thi s Kil l includ e treatmen t o f ad d min e drainag e usin g various treatmen t method s a s feel l « s othe r tsethod s t c contro l contaminatio n problems

. I f problem s ar e identifie d durin g th e remedia l Investigatio n wor k involvin g tailing s pile s an d poncis * remedia l jaeasure s wil l fc e develope d an d screene d fo r thi s component o f th e project

. 3

. jteta

. 1 1ja d Ev a . 1 ua t 1 o n o f Coig^onen t s o f Rjejrae d 1 a l P l.an s
. A treatmen t alternativ e woul d b e broke n int o component s fo r evaluatio n including : A

. Benc h scal e test s o f alternativ e treatmen t processes , testing treatment processe s unde r laborator y condition s usin g sample s o f mine drainag e taker ? froa i Californi a 6ulch; f8

.

sitingtft " a treateeri t facility

. Site s fciy< j b e foun d taking int o accoun t geotechm c stability
, availabilit y o f utilities
, fiocdp'fai n avoidance
, topographi c compat i b l 1 H y wit h tunne l outlets
, require d lan d area , sit e access , an d compatibilit y wit h existin g an d planne d len d us e regulations ; and C

. developmen t o f a sludg e processin g an d dispose ! method s en d disposa l locations

. AJternat i v e EvaluatJQn

. Usin g component s tha t wer e foun d t o b e feasible alternativ e plan s foil ] b e develope d t o cove r al l aspect s o f t h e remedia l effor t a t sites

. Eac h remedia l alternativ e wil l b e describe d f ey & schematic

. Th e assig n basis
, sizing o f units , estimate d capita l cost
s operatio n an d maintenanc e costs , a staffin g plan * a n evelu&tic n o f operabilit y an< j reliabilit y f actor s » and an environmenta l impac t assessmen t wil l b e include d fo r eac h alternative

. 5

. A 1 ter nat i yre Se l ec t l O T an c Coticep t u a 1 Oes i § n . A R alternativ e will fa e s e 1 ectec * an d a CGRceptue l oeil p willl e prepare d

.

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