SDM S Document I D 

# Ti n i i i

200025 5



## IS&R/Car r For k Remedia l Investigatio n Sit e Groundwate r Conceptua l Mode l B y Orde r of : Unite d State s Environmenta l Protectio n Agenc y Unilatera l Administrativ e Orde r CERCL A Docket No

. 08-2001-1 2 Prepare d by :

ANDERSO N ENGINEERIN G COMPANY

, IN C 97 7 Wes t 210 0 Sout h Sal t Lak e City

, U T 84119 (801)972-622 2 J B R Consultant s Grou p 184 1 Eas t For t Unio n Blvd Sandy

, Utah 8412 1 Or

. Ala n Mayo

, May o & Associate s Brigha m Youn g Universit y Provo

, Uta h Prepare d for : Atlanti c Richfiel d Company 30 7 Eas t Par k Street

, Suit e 40 0 Anaconda

, M T 5971 1

March 12, 2002IS& R / Car r For k Remedia l Investigatio n Site Groundwate r Conceptua l Mode l TABL E O F CONTENT S [ SECTIO N

1. 0 INTRODUCTION............................................................................................................. ! 1 . 1 Genera l Sit e Descriptio n

...................................................................................... 1 1. 2 Regulator y

........................................................................................................... 2 1. 3 Reclamatio n Histor y

............................................................................................ 2 1. 4 Plannin g Tea m

.................................................................................................... 2

2 . 0 CURREN

T CONCERN S ......:.......................................................................................... 3 

### 2. 1 Proble m Statemen t

............................................................................................. 3 2. 2 Previou s Groundwate r Investigation s

.................................................................. 4

3 . 0 SIT E GROUNDWATE R

CONCEPTUA

L MODEL

........................................................... 6 3. 1 Geolog y

............................................................................................................... 6 3. 2 Hydrolog y ............................................................................................................7

. 3.2. 1 Regiona l Groun d Wate r Hydrolog y

.......................................................... 7 3.2. 2 Site Subsurfac e Hydrolog y

...................................................................... 8 3.2. 3 Recharg e

................................................................................................. 8 3. 3 Groundwate r Chemistr y .....................................................................................10 3.3. 1 IS&R/Car r For k Are a ..............................................................................10 3.3.1. 1 Regiona l Groun d Wate r Hydrolog y .............................................10 3.3.1. 2 Groundwate r Chemistr y IS& R Sti e & Lincol n

............................ .

1 1 3.3. 2 Erd a Are a ...............................................................................................1 2 3. 4 Potentia l Chemica l Source s an d Pathway s ........................................................1

3 3.4. 1 IS&R/Ca r For k Vicinit y ...........................................................................1 3 3.4.1. 1 Min e De-waterin g & Pin e Canyo n Wate r Settlin g Pond s 1 3 3.4.1. 2 Sla g Pil e ..........................................................................1 5 3.4.1. 3 Pin e Canyo n Landfil l .......................................................1 7 3.4.1. 4 Elto n Tunne l ....................................................................1 8 3.4.1. 5 Car r For k Tailing s ..........................................................2

0 3.4.1. 6 IS& R Tailing s .................................................................2 2 3.4.1. 7 Wast e Isolatio n Cel l ........................................................2

3 3.4.1. 8 Summar y ........................................................................2 4 3.4. 2 Erd a Are a ..............................................................................................2 4

4. 0 DAT A GAP S ................................................................................................................2 6 4 . 1 Existing Well s an d Monitoring Dat a ...................................................................26 4. 2 Pin e Canyo n Drainag e ......................................................................................2 8 4. 3 Erd a Nitrat e ........................................................................................................2 8
5 . 0 DECISIO N

RUL E AN D SCHEDULIN

G INFORMATIO N

...............................................2

9 5. 1 Develo p a Decisio n Rul e ...................................................................................2 9 5. 2 Specif y Limit s o n Decisio n Errors ......................................................................3 0 5. 3 Optimiz e Desig n ................................................................................................3 0 5. 4 Schedul e ...........................................................................................................3 0

Atlanti c Richfield Compan y i

Marc h 12,200 2IS& R / Car r For k Remedia l Investigatio n Site Groundwate r Conceptua l Mode l

6. 0 REFERENCE S

........................................................................... . LIS T O F TABLE S Tabl e 1- 1 Definition s Tabl e Table 1- 4 Plannin g Tea m Tabl e 3- 1 Fiel d Soi l Permeabilitie s Table 3- 2 Laborator y Soi l Permeabilitie s Table 3- 3 Groundwate r

Monitoring Historica l Exceedence s Tabl e 3- 4 Ape x Shaf t Wate r Qualit y Table 3- 5 Settlin g Pon d Influen t Wate r Qualit y Table 3- 6 Settlin g Pon d Influen t Nitrat e 1979-198 3 Tabl e 3- 7 Sla g Tota l Metal s Table 3- 8 Sla g E

. P

. Toxicit y Table 3- 9 Pin e Canyo n Landfil l Tota l Metal s Tabl e 3-1 0 Pin e Canyo n Landfil l E.P

. Toxicit y Table 3-1 1 Assa y Result s fo r Elto n Tunne l Dum p Table 3-1 2 Tota l Metal s Analyse s fo r Pin e Creek belo w Elto n Tunne l Table 3-13 Car r For k Tailing s Tota l Metal s Table 3-14 Car r For k Tailing s E.P

. Toxicit y Tabl e 3-1 5 IS& R Tailing s Tota l Metal s Tabl e 3-1 6 IS& R Tailing s E.P

. Toxicit y Table 3-1 7 Potentia l Groundwate r Impac t Source s LIS T O F FIGURE S .20

Figur e 1. 1 Vicinit y Ma p Figur e 2. 1 Pas t Investigation s - Groundwater : IS&R

, Lincoln

, Figur e 2. 2 Pas t Investigation s - Groundwater : IS&R

, Lincoln

, Figur e 2. 3 Pas t Investigation s - Groundwater : IS&R

, Lincoln

, Figur e 3. 1 Groundwate r Conceptua l Mode l Diagra m Figur e 3. 2 Geologi c Cros s Sectio n Figur e 3. 3 Tooel e Valle y Geolog y Figur e 4. 1 Existing an d Propose d Monitoring Well s LIS T O F APPENDICE S Appendi x A Groundwate r Wate r Samplin g Dat a Bas e Erd a Are a Well s - A s Erd a Are a Well s - P b Erd a Are a Well s - Nitrat e

Atlanti c Richfield Compan y Marc h 12,200 2IS& R / Car r For k Remedia l Investigatio n Site Groundwate r Conceptua l Mode l TABLE 1- 1 DEFINITION S AECI Anacond a ARA R Atlanti c Richfield BSH W CERCLA C P M DER R DOO M DQ O ERA F I T F S F S P H R S IS& R J B R KUC C L A P M C L NRC S N P L P A PARCC Q A QAPP Q C R A RCR A RD Rl RO D S A P S C M SDWP S SGC M S I sit e S O W Anderso n

Engineerin g Co.

, Inc

. Anacond a Coppe r Compan y Applicabl e o r Relevan t an d Appropriat e Requirement s Atlanti c Richfield Compan y Burea u o f Soli d an d Hazardou s Wast e Comprehensiv e Environmenta l Response

, Compensation

, an d Liabilit y Ac t Critica l Pat h Metho d Uta h Divisio n o f Environmenta l Respons e an d Remediatio n Divisio n o f Oil

, Gas

, an d Minin g Dat a Qualit y Objective s Unite d State s Environmenta l Protectio n Agenc y EPA' s Fiel d Investigatio n Tea m Feasibility Stud y' . Fiel d Samplin g Pla n prepare d fo r th e IS&R/Car r For k sit e b y AEC I Hazar d Ranking Syste m Internationa l Smeltin g an d Refinin g Compan y J B R Environmenta l Consultants

, Inc

. (Formerl y Know n a s JB R Consultan t Group ) Kennecot t Uta h Coppe r Corporatio n Laboratory Analytica l Protoco l Maximu m Contaminan t Level s Nationa l Resourc e Conservatio n Servic e Nationa l Prioritie s Lis t fo r Uncontrolle d Hazardou s Wast e Site s Preliminar y Assessmen t Dat a Qualit y Indicator s Includin g Precision

, Accuracy an d Bia s Representativeness

, Comparability

, an d Completenes s Qualit y Assuranc e Qualit y Assuranc e Projec t Pla n Qualit y Contro l Remedia l Actio n Resourc e Conservatio n an d Recover y Ac t Remedia l Desig n Remedia l Investigatio n Record o f Decisio n Samplin g Analysi s Pla n prepare d fo r th e IS&R/Car r For k sit e by AEC I • Sit e Conceptua l Mode l Secondar y Drinking Wate r Protectio n Standar d Site Groundwate r Conceptua l Mode l Sit e Inspectio n IS&R/Car r For k propert y an d adjacen t propertie s t o b e investigated

. Scop e o f Work

Atlanti c Richfield Compan y Marc h 12
, 200 2IS& R / Car r For k Remedia l Investigatio n Site Groundwate r Conceptua l Mode l TCL P Toxicit

y Characteristi c Leachat e Procedur e I D S Tota l

Dissolve d Solids UDEQ Uta h

Departmen t o f Environmenta l Qualit y UDW R Uta h

Divisio n o f Wildlif e Resource s USG S Unite d

State s Geologica l Surve y U S U Uta h

Stat e Universit y W I C Wast

e Isolatio n Cell : cel l wher e specifie d waste s wer e place d i n 1986

. W P Wor k

Pla n prepare d fo r th e IS&R/Car r For k sit e b y AEC I

Atlanti c Richfiel d Compan y i v

Marc h 12,200 2IS& R / Car r For k Remedia l Investigatio n Site Groundwate r Conceptua l Mode l

1 . 0 INTRODUCTIO N Thi s Sit e Groundwate r Conceptua l Mode l (SGCM ) ha s been prepare d a s th e firs t phas e o f th e remedia l investigatio n concernin g th e groundwate r condition s a t th e IS&R/Car r For k projec t site

. T h e purpos e o f thi s documen t i s t o provid e a framewor k fo r understandin g an d interpretin g existing informatio n an d dat a regardin g groundwate r a t o r nea r th e site

. Also

, i t wil l facilitat e identifyin g area s o f additiona l stud y an d th e need fo r additiona l o r supplementar y information

. Followin g th e E R A dat a qualit y objective s format

, i t provide s projec t background

, a summary o f previou s dat a collecte d an d define s th e objective s o f th e stud y a s i t pertain s t o th e region' s aquifers

. I t als o outline s samplin g an d dat a collectio n propose d t o b e conducte d during th e investigatio n t o fil l dat a gap s an d provid e informatio n sufficien t t o creat e alternativ e remedies

, i f deeme d requisit e t o meet reclamatio n objectives

. 1 . 1 Genera l Sit e Descriptio n Informatio n T h e sit e is locate d i n Tooel e County

, Uta h o n th e wes t flan k o f th e Oquirr h Mountain s a t th e mout h o f Pin e Canyon

, a s show n o n Figur e 1.1

. Th e IS&R/Car r For k sit e wa s home t o tw o separat e mining relate d operations
, th e Internationa l Smelte r (IS&R ) an d Car r For k complex

, bot h owned an d operate d b y Anacond a Mineral s Company

. IS& R covere d a n are a o f approximatel y 1,20 0 acre s o n whic h copper
, lead

, an d zin c or e mining an d processin g occurre d ove r a perio d o f abou t 7 0 years

. Th e sit e historicall y include d min e workings

, a mil l site
, a smelte r area , a slag pile

, tailin g impoundments

, settlin g ponds

, an d landfil l areas

. Th e IS& R operatio n bega n i n 190 9 an d operate d continuousl y unti l 1972

. T h e Tooel e Smelte r wa s completel y dismantled

, excep t fo r a fe w buildings

, includin g th e mai n offic e building

, th e chemica l laboratory

, th e genera l warehous e an d variou s smal l shops

. Mos t o f th e remainin g smelte r feature s wer e reclaime d during th e fal l an d spring o f 1986/1987

, a s describe d i n th e reclamatio n pla n (Anderson

, 1986)

. T h e Car r For k Millin g Operation s wer e locate d o n 12. 5 acre s withi n Pin e Canyo n wit h th e hea d structur e an d min e adi t a t th e hea d o f th e canyon

. Th e Car r For k comple x wa s complete d an d bega n operatio n i n Augus t 1979

. I t wa s designe d t o produc e 45,00 0 t o 55,00 0 metri c ton s pe r yea r o f coppe r concentrates
, wit h a n anticipate d min e lif e o f 2 0 years

. Th e flotatio n mil l a t Car r For k wa s locate d i n th e narro w middl e par t o f Pin e Canyon

. Mil l wast e consiste d o f fine s which wer e dispose d o f o n sit e in a ne w tailing s pon d belo w t h e ol d IS& R smelte r site

. A decisio n t o shu t dow n th e mil l was mad e in Novembe r 1981

. Min e de-waterin g ceased i n Februar y 1985

. Negotiation s fo r th e min e wer e complete d i n Octobe r o f 198 5 wit h th e sal e o f selecte d Car r For k propertie s t o Kennecot t Uta h Coppe r Corporation s (KUCC)

. Th e Tooel e Valley s portion s o f th e Car r For k operation s an d th e IS& R disturbances

, wer e no t purchase d b y KUC C an d wer e reclaime d b y Anacond a i n 1986

. Th e sit e wa s vegetate d during th e reclamatio n activitie s i n 198 6 wit h grasses , forbe s an d occasiona l shrubs

. Atlanti c Richfield continue s t o activel y maintai n reclaime d features

. I n 1994
, Atlanti c Richfield an d th e Stat e o f Uta h entere d int o a long ter m agreemen t t o establis h th e sit e a s
a wildlif e conservatio n easement

. Th e Uta h Divisio n o f Wildlif e Resource s (UDWR )

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1 1IS& R / Car r For k Remedia l Investigatio n Site Groundwate r Conceptua l Mode l provide s oversigh t o f th e propert y an d ha s performe d wildlif e enhancemen t project s sinc e 1994

. Th e Car r For k mil l wa s dismantle d an d shippe d of f th e sit e i n 1986

. Reclamatio n o f 

### t h e uppe r Pin e Canyo n are a wa s complete d b y KUC C in 1989

. Pin e Canyo n i s shor t an d narro w wit h a distanc e fro m head t o mout h o f approximatel y thre e miles

. Th e canyo n is draine d b y Pin e Creek wit h contribution s fro m adjacen t Pol e Canyon

, othe r sid e canyons , spring s an d th e Car r For k min e tunnel

. Th e strea m flow s wes t ou t o f Pin e Canyo n alon g th e norther n boundary o f th e forme r smelte r sit e unti l i t infiltrate s th e groun d befor e reachin g th e Atlanti c Richfield propert y line

. Historically

, Pin e Creek als o receive d wate r fro m th e Elto n Tunnel

. Thi s flo w n o longe r ha s a surfac e expression
, a s th e tunne l ha s bee n collapsed

, preventin g futur e flow s fro m thi s source

. Durin g operation s a t t h e site
, surfac e flow s wer e apparentl y large r a s loca l resident s clai m t o have used th e wate r fo r irrigatio n purpose s in th e Lincol n are a an d possibl y a s fa r awa y a s Erda

. 1. 2 Regulator y T h e Uta h Min e Lan d Reclamatio n Ac t o f May 1975

, require d reclamatio n fo r th e Car r For k operations

. Th e IS& R smelte r wa s "pre-law " an d di d no t fal l unde r cleanu p requirement s o f th e Act

. However

, Atlanti c Richfiel d voluntaril y include d bot h th e area s encompasse d b y t h e IS& R an d Car r For k operation s i n it s reclamatio n wor k propose d i n th e lat e 1980's

. Followin g preliminar y studie s conducte d by various agencies
, Atlanti c Richfiel d evaluate d t h e sit e i n 198 6 an d prepare d a reclamatio n plan

. Upo n approva l t o procee d fro m th e State o f Uta h Divisio n o f Oil

, Ga s an d Minin g (DOGM)

, reclamatio n action s identifie d i n th e pla n wer e complete d during th e fal l an d sprin g o f 1986/1987

. Afte r severa l phase s o f stud y fro m th e 1980' s throug h th e 1990's
, th e sit e wa s scored i n accordanc e wit h th e EP A establishe d Hazar d Rankin g Syste m (HRS)

. Based o n th e HR S

score th e sit e wa s liste d o n th e nationa l priorit y lis t unde r th e CERCL A regulations

. 1 . 3 Reclamatio n Histor y • Durin g th e year s 1986-1987

, unde r th e oversit e o f DOGM

, Atlanti c Richfield performe d a n extensiv e reclamatio n a t th e property

. Th e reclamatio n wor k include d th e remova l o f remainin g building s an d structures
, consolidatio n o f wast e materials

, constructio n o f stor m wate r control s an d placemen t o f cover soil ove r tailin g impoundment s an d smelte r operationa l areas

. Area s o f disturbanc e in Pin e Canyon

, above th e smelte r site
, wer e reclaime d b y KUC C in 1989

. 1 . 4 Plannin g Tea m T h e stud y tea m is compose d o f Atlanti c Richfiel d Compan y manager s an d technica l suppor t professionals

. Th e suppor t personne l ar e compose d o f engineers
, scientist s an d technician s familia r wit h th e environmenta l assessment s o f min e operations
, reclamation

, groundwater

, wate r qualit y an d hazardou s wast e handling

. Th e regulator y agencie s involve d includ e th e U.S

. Environmenta l Protectio n Agency

, Regio n 8 an d th e State o f Uta h

Atlanti c Richfiel d Compan y 2

Marc h 12,200 2IS& R / Car r For k Remedia l Investigatio n Sit e Groundwate r Conceptua l Mode l Departmen t o f Environmenta l Quality

, Divisio n o f Environmenta l Respons e an d Remediation

. Table 1- 4 show s th e plannin g tea m b y positio n an d responsibility

. TABL E 1- 4 PLANNIN G TEA M Organizatio n E RA BO R State o f Uta h Atlanti c Richfield Compan y ANDERSO N Engineerin g Co.

, Inc

. ANDERSO N Engineerin g Co.

, Inc

. J B R May o & Associates / Brigha m Young Universit y Positio n Projec t Manage r O n Sit e Coordinato r O n Sit e Coordinato r Projec t Manage r DER R Coordinato r Projec t Manage r Projec t Manage r Senio r Projec t Enginee r Projec t Enginee r Geochemis t Nam e

Joshu a Knigh t Richar d Thalman n Michael

- Storc k Chuc k Stilwell

, P.E

. Steve n D

. Anderson

, P.E

. Kevi n B

. Cosper

, P.E

. Bria n Buc k D r

. Ala n May o

2 . 0 CURREN

T CONCERN S

2 . 1 Proble m Statemen t T h e IS& R smelte r operate d a t th e sit e near Tooele

, Uta h fro m 190 9 throug h th e mid-1970' s when it wa s shu t dow n an d eventuall y dismantled

. Inheren t in th e smelting proces s i s th e concentratin g o f metal s fo r furthe r refining

. Elevate d metal s concentration s have been foun d o n th e surfac e a t th e sit e b y investigatio n studie s sinc e closur e o f th e facilities

. I n additio n t o surfac e investigations
, wate r an d groundwate r studie s have als o been completed

. Th e most comprehensiv e studie s o f surfac e an d groundwate r wer e complete d i n 198 4 an d 198 5 b y Anaconda,.th e EP A an d thei r contractors

. Investigatio n result s hav e ha d limite d indication s which sho w limite d area s o f elevate d constituent s o f concern

. Table 3- 3 provide s a summar y o f are a monitorin g wel l result s which have historicall y exceede d groundwate r MCL's

. A s par t o f th e IS& R facilit y an d late r a s par t o f th e Car r For k operation
, minin g activitie s i n t h e Oquirrh rang e have bee n conducted

. This investigatio n wil l evaluat e previou s dat a fro m are a sampling

, regiona l geologi c formation s an d are a hydrolog y t o determin e i f samplin g result s o f concer n ca n b e attribute d t o smelte r operation s o r i f conclusion s canno t b e mad e a t thi s time
, what dat a gap s exis t s o tha t gap s ma y b e filled

, an d more conclusiv e Atlanti c Richfiel d Compan y March 12,200 2IS& R / Car r For k Remedia l Investigatio n Sit e Groundwate r Conceptua l Mode l
determination s ca n possibl y be made

. 2 . 2 Previou s Groundwate r Investigation s A numbe r o f organization s an d agencie s have conducte d groundwate r studie s a t an d near t h e IS&R/Car r For k site

. Th e followin g paragraph s summariz e previou s sampling activitie s o n th e site

. A summar y o f th e groundwate r analytica l result s compare d t o MC L standard s collecte d during previou s investigation s ar e containe d i n Appendi x A

. Result s o f wate r qualit y analysi s fo r As

, P b an d Nitrat e ar e presente d b y wel l locatio n in Figure s 2.1
, 2. 2 an d 2.3

. Thoma s (1946 ) describe d th e groundwate r i n Tooel e Valley

, discusse d th e geolog y o f th e valle y an d adjacen t mountains
, an d studie d som e aspect s o f th e hydrolog y o f th e valle y in detail

. Gate s (1965 ) prepare d a discussio n o f th e groundwate r budget

, groundwate r usag e an d futur e potentia l fo r th e groundwate r o f th e Tooel e Valley

. T h e USG S prepare d a publicatio n i n 198 1 (Raze m an d Steiger

, Technica l Publicatio n No

. 6 9 ) which presente d th e groundwate r condition s i n th e Tooel e Valle y fro m 197 6 throug h 1978

. On e o f th e conclusion s o f th e repor t i n regar d t o wate r qualit y was tha t th e groundwate r near Pin e Canyo n tende d t o have mor e elevate d sulfat e concentrations
, possibl y du e t o discharg e fro m th e Elto n Tunne l o r th e Car r For k mine

. This repor t als o discusse s th e wate r budge t i n th e Tooel e Valle y fro m 196 3 t o 1978

. Wahle r (1977 ) presente d finding s fro m aquife r testin g performe d o n th e Boy s Ranc h wel l

a n d informatio n abou t th e aquife r an d groundwate r regim e a t th e Site

. T h e transmissivit y o f th e aquife r wa s repor t t o b e possibl y a s hig h a s 844,00 0 gpd/ft

. Th e averag e thicknes s o f th e aquife r was reporte d t o be 50 0 feet

. Th e unsaturate d zon e 

### overlyin g th e aquife r withi n th e tailing s pon d area average s 60 0 fee t i n thickness

. Wahle r (1978 ) presente d finding s o f a stud y performe d i n preparatio n fo r tailing s pon d managemen t

a t th e Car r For k Project

. Tailing s an d soil s wer e als o teste d fo r geotechnica l characteristics

. Rya n et

. al

. (1981 ) advance d a tes t borin g (Tes t hol e 8 ) abou t tw o mile s northeas t o f Tooel e an d about two mile s wes t o f Pin e Canyon

. The tes t hol e wa s cased t o 13 4 fee t an d wa s drille d an d logge d t o a dept h o f 1,51 1 feet

. Base d o n th e neutro n log

, th e sediment s di d no t appea r t o b e saturate d unti l 41 6 fee t belo w th e lan d surface

. Th e resistivit y lo g indicate d wate r bearin g sand an d grave l fro m 41 6 t o 85 6 fee t wit h onl y occasiona l cla y zone s present

. A n exceptionall y thic k grave l zon e occur s fro m 60 4 t o 76 0 feet

. Fres h wate r wa s presen t fro m 42 6 t o 95 0 fee t belo w whic h dept h wate r qualit y naturall y deteriorates

. Hebdo n (1984)

, workin g fo r th e Uta h Divisio n o f Environmenta l Health

, Burea u o f Soli d an d Hazardou s Wast e (BSHW)

, no w th e DERR

, presente d th e finding s o f th e S I performe d a t t h e Tooel e Smelte r an d Anacond a - Car r For k Operatio n t o th e EPA

. Durin g th e sit e investigatio n o n Jun e 30
, 1984
, BSH W personne l collecte d tw o groundwate r samples

, 

### includin g a sampl e o f th e spring emanatin g fro m unde r th e slag pile

, an d on e fro m th e ta p wate r a t Boy s Ranc h (sourc e wa s reporte d t o b e spring water)

. I t wa s reporte d tha t th e Atlanti c Richfield Compan y' 4 Marc h 12,200 2tint m <O.» H 2)1094 O.Ct t 12I07 M O.00 5 OTOT7 8 0.00 2 B JS2091S K 0.002 S i 0915(8 2 0.002>* ^ STOS18 S <0.00 1 ! 1211818 7 <t.00 1 12118)8 7 <.00 1 WWB B

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KOT t WD 1 KUUBOB COnDPON D T O TAO I B- J NOTC : DAT A SHOW N O N DUWM O II I RED IHUCATtS A DSOEPANC r I N TABL E DATA

.

No

. Reviiion/luu e

Dot e , IS&R/CAR R FOR K SMELTE R SIT E TOOELE

. UTA H ATLANTI C RICHFIEL D COMPAN Y MONTAN A



### ANDERSO N

COMPANY

. INC

.

DRAW N BT : CN F ENGINEER : KS B APFUOVED : SO A

ARSENI C LEVEL S I N USGS MONITORIN G WELL S ERDA

, LINCOLN

, & TOOELE

. UTA H

r -w

97-06M 4 28-FEBRUARY-2002 •M h N.T. S \ ^ FIGUR E 

# 2. 109(77/93 <0.0 2 osBM i <o'ocn I

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FIG73; 3 CROSS " SECTIO N LIN E

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## /
Genera l Nate s LEGEN D
WEL L WEL

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NITRAT

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_ WEL L SAMPLE TRATION LOCATION (mg/L )

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.

N o

. RuvUlon/fcju e Dat e

r ^\ IS&R/CAR R FOR K SMELTE R SIT E TOOELE

, UTA H ATLANTI C RICHFIEL D COMPAN Y MONTAN A h

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r ^ 

### ANDERSO N

ENOINEERIN O

COMPANY

.

INC

. L

. J

r DRAW

N BY : CN F " ^ ENGINEER : KS B APPROVED : SO A J

r - > LEA D LEVEL S I N USO S MONITORIN G WELL S ERDA

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, & TOOELE

, UTA H

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. HUMBtR S COtttSPON D 70 TAB U B- J KOTC : DAT A SHOW N O N DUWM O I N RE D IMMCATES A DBCREPAHC T I H 11BL E DATA

.

N o ^ ^ Revision/lasu e Dol

e IS&R/CAR R FOR K SMELTE R SIT E TOOEIE

, UTA H ATLANTI C RICHFIEL D COMPAN Y MONTAN A



### ANDERSO N

ENGINEERING

COMPANY

.

INC

.

DRAW N BY : CN F ENGINEER : KB C APPROVED ; SO A

NITRAT E & NITRIT E LEVELS I N USG S MONITORIN G WELL S ERDA

, LINCOLN

. S TOOELE

. UTA H

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- 97-0694 4 28-FEBRUARY-200 2 N.T. S L ^ FIGUR E 

# 2.3IS& R / Car r For k Remedia l Investigatio n Site Groundwate r Conceptua l Mode l sample s wer e collecte d unde r th e supervisio n o f th e BSH W qualit y assuranc e officer ; however

, detail s o f th e sampl e collectio n wer e no t include d in th e Sit e Inspectio n report

. T h e 199 5 DER R sit e investigatio n repor t state s (se e Sectio n 2.5 ) tha t th e qualit y assuranc e dat a fo r thi s 198 4 sit e inspectio n analytica l result s wer e "absent o r ver y poor. " Sample s wer e submitte d t o th e Uta h State Healt h Laborator y fo r analysis

. Wate r sample s wer e analyze d fo r tota l metals

, majo r cations/anions

, an d nutrients

. Groundwate r sample d fro m a spring seepin g ou t fro m unde r th e slag pil e ha d MC L exceedence s fo r lea d an d cadmiu m concentrations

. Al l teste d constituent s withi n th e tap.wate r sample d a t th e Boys Ranch

. facilit y (sourc e o f wate r state d as a spring t o th e east in th e Oquirrh Mountains) wer e belo w bot h th e primar y an d secondary drinking wate r standards

. EPA' s FI T subcontracto r Ecolog y an d Environment

, bega n workin g a t th e Sit e i n 1985

. The y collecte d a groundwate r sampl e fro m a Pin e Canyo n wel l u p gradien t o f th e site

. Th e groundwate r sampl e wa s analyze d fo r tota l an d dissolve d metal s a s wel l a s sulfat e an d cyanid e concentrations

. Th e FI T repor t state d tha t wate r result s wer e give n a Q A revie w a t th e EP A Regio n VII I laborator y prio r t o bein g reported

. Constituent s teste d i n th e groundwate r wer e reporte d belo w th e primar y an d secondar y drinking wate r protectio n standards

. J B R conducte d a groundwate r investigatio n a s par t o f thei r preparatio n fo r reclaiming an d stabilizin g th e Site (JBR

, 1986)

. Betwee n Augus t an d December

, JB R collecte d thre e set s o f sample s fro m th e fou r deepe r groundwate r well s locate d nort h an d wes t o f th e Sit e an d

a spring a t th e base o f th e sla g pile

. Th e well s sample d b y JB R include d GW- 1 (16-inc h Boy s Ranch Well)

, GW- 2 (Bruc e Sage r Well)

, GW- 3 (6-inc h Boy s Ranch Well)

, an d GW- 4 (Tailing s Da m Well)

. A t tha t tim e th e spring
, GW-5

, wa s flowin g fro m th e bas e o f th e sla g pile t o th e northwes t o f th e pile

. Th e sampl e collecte d fro m th e existing spring a t th e bas e o f th e sla g pil e wa s reporte d t o excee d th e Primar y Drinkin g Wate r Standard

, Maximu m Contaminan t Level s (MCL ) fo r cadmiu m an d lead

, an d th e SDWP S fo r sulfat e an d TDS

. Stol p (1994 ) discusse s th e increase d need fo r groundwate r resources i n th e Tooel e Valle y as developmen t increases

. Sadik-Macdonald (1997 ) presente d th e finding s o f a secon d S I complete d a t th e Site i n 1996

. Th e stud y wa s conducte d b y th e DER R fo r th e EPA

. Th e stud y include d samplin g 

### o f fou r wells ; AC-GW-0 1 ( a USG S Wel l i n Lincoln)

, AC-GW-0 2 (Sager s Well

, JBR' s GW-02)

, AC-GW-0 3 (Kennecott Propert y Line)

, AC-GW-0 4 (Boy s Ranch 6 " Well

, JBR' s GW-03)

. A filtere d sampl e an d a n unfiltere d sampl e wer e collecte d fro m eac h o f th e wells

. Th e sampl e 

### collecte d fro m th e 6 " Boy s Ranch wel l reporte d arseni c concentration s above th e primar y MCL

. Thes e result s fo r th e Boy s Ranch wel l wer e flagge d becaus e spik e recover y percentag e (69.5% ) wa s belo w th e acceptabl e rang e (75 % -125%)

. T h e USG S publishe d anothe r repor t i n 199 7 (Steige r an d Lowe

, Wate r Resources Investigation s Repor t 97-4005 ) whic h presente d th e result s o f a stud y o f recharg e an d discharg e area s an d qualit y o f groundwate r i n Tooel e Valley

. Th e historica l analytica l result s fo r severa l well s locate d near th e sit e an d i n an d aroun d Erd a wer e presented

. Th e repor t discusse d th e elevate d nitrat e concentration s in Erd a an d althoug h it did no t arriv e a t definit e conclusion s a s t o th e sourc e o f th e nitrates
, it cite d th e finding s o f th e UDE Q stud y wherei n elevate d nitrat e level s wer e foun d i n th e unsaturate d zone a t th e IS& R site

. Atlanti c Richfield Compan y 5

Marc h 12,200 2IS& R / Car r For k Remedia l Investigatio n Site Groundwate r Conceptua l Mode l A wate r right s searc h was conducte d withi n a two-mil e radiu s o f th e sit e boundar y in 2001

. T h e searc h include d bot h surfac e wate r an d undergroun d wate r rights

. Th e result s o f th e researc h ar e include d i n th e IS&R/Car r For k Samplin g an d Analysi s Plan

. T h e combine d groundwate r sampling an d analytica l result s complete d b y bot h governmen t agencie s an d privat e consultant s ha s been assemble d int o a singl e dat a base

. Som e mino r 

### discrepancie s have been identifie d an d wil l requir e attentio n a s describe d late r i n th e report

. 3 . 0 SIT E GROUNDWATE R

CONCEPTUA L MODEL

3 . 1 Geolog y Tooel e Valle y is i n th e northeas t par t o f Tooel e County

, approximatel y 3 0 mile s southwes t

o f Sal t Lak e City

. Se e Figur e 1.1

. Th e valle y is bounde d b y th e Grea t Sal t Lak e o n th e nort h an d b y mountain s o n th e thre e othe r sides

. Th e valle y floo r an d associate d mountai n drainage s encompas s approximatel y 40 0 squar e miles

. Th e easter n borde r o f th e Tooel e Valley

, wher e th e forme r IS& R Smelte r resides

, i s th e north-trendin g Oquirrh Mountain s wher e th e boundar y betwee n th e valle y fil l an d th e mountain s i s usuall y abrupt

. Th e IS& R Smelte r sit e is a t a n elevatio n o f approximatel y 5400 f t above MS L o n th e foothill s o f Clippe r Ridge

. Clippe r Peak a t th e to p o f Pin e Canyo n ha s a n elevatio n o f 920 7 f t abov e MSL

. Th e northerl y boundar y o f th e sit e range s i n elevatio n fro m 5000 f t t o 560 0 f t above MSL

. T h e Tooel e Valley an d th e Oquirrh Mountain s t o th e east ar e i n th e Basi n an d Rang e Physiographi c Provienc e (Fenneman

, 1931)

. Th e Oquirrh Mountain s are, fo r th e most part
, rugge d wit h shar p ridge s an d dee p canyons

. Onl y limite d area s o f fla t meadow s o r gentl e slopin g hillside s exis t withi n th e range

. Consolidate d roc k is generall y confine d t o th e Oquirrh Mountai n area

. Th e Oquirr h Mountain s ar e compose d o f th e Oquirr h grou p (formation) o f lat e Mississippian

, Pennsylvania n an d earl y Permia n age

. Th e predominan t litholog y o f th e consolidate d roc k i s sandstone

, quartzite
, an d limeston e wit h som e shal e a n d dolomite (USG S 1994)

. Th e consolidate d roc k ha s experience d structura l deformatio n by faultin g (Gate s 1963)

. Solutio n opening s ma y exis t i n limeston e along joints

. Larg e amount s o f unconsolidate d materia l ar e uncommo n an d ar e onl y foun d in th e canyo n bottom s a s strea m channe l deposit s o r in th e uppe r canyon s a s glacia l deposits

. 

### T h e easter n edg e o f th e valle y i s characterize d b y shor e line s an d terrace s o f th e Pleistocen e Lak e Bonnevill e u p t o a n elevatio n o f abou t 510 0 f t abov e MSL

. Abov e thi s elevation

, ther e ar e remnant s o f ol d alluvia l fan s tha t have been dissecte d b y erosio n a s base lak e level s receded

. I n profil e th e valle y ha s a concave shap e wit h stee p slope s near t h e mountai n fron t (broke n b y terraces ) an d graduall y becomin g flatte r near th e lake

. Th e differenc e is elevatio n fro m th e uppe r stran d lin e near th e mont h o f Pin e Canyo n t o th e presen t lak e leve l i s abou t 1000.f t i n distanc e an d approximatel y 1 0 mile s (Wahle r 1977)

. Figur e 3. 2 i s a geologica l cross-sectio n o f th e easter n foothill s o f th e valley

. A ma p o f th e surfac e geolog y o f th e valle y i s presente d a s Figur e 3.3

. T h e basi n valle y i s fille d wit h thic k wedge s o f sedimen t fro m long-ter m erosio n o f th e uplifte d mountai n range

. Th e sediment s consis t o f alluvial

, colluvial

, lacustrin e an d volcani c material s o f Tertiar y an d Quaternary age

. Thes e sediment s wer e deposite d a s interfingerin g layer s o f clay

, sand

, an d grave l (USD A 1992)

. Som e volcani c material s exis t
Atlanti c Richfield Compan y

. 6

Marc h 12,200 2OQUIRR H MOUNTAIN S CONSOLIDATE D ROC K'

t al depoalt a mbitur a o f day

. sand

, gravel

, cobfatas lynlca l I n al l borings

. ANDERSO N

•NOINKBRtN

O COMOANV

.

TOOEL E VALLE Y GEOLOG Y CROS S SECTIO N

ERDA

, LINCOLN

, I TOOELE

, l/TA H

-.»

- tux»a ""iWWCHJCI K AS5H7/ M M

. * FIGUR E 

## 3 ?IS& R / Car r For k Remedia l Investigatio n Site Groundwate r Conceptua l Mode l

in th e southeaster n are a o f th e valley

. Deposit s ar e mor e coarsel y graine d nea r th e surfac e a n d become more dens e an d fin e wit h depth

. Abov e th e 5100-foo t elevation

, th e ol d alluvia l fan s ar e coars e graine d wit h layer s o f claye y zones resulting fro m weatherin g an d mixing wit h colluvia l soil s fro m th e stee p slope s o f th e adjacen t mountai n sides

. T h e alluvia l fil l o f th e valle y thicken s rapidl y du e t o norma l fault s alon g th e base o f th e mountai n front

. Wahle r (1977 ) indicate s a 180 0 f t dept h o f alluvia l material s over consolidate d roc k a t th e mout h o f Elto n Tunnel

. Alon g th e Railroa d righ t o f way , betwee n Lincol n an d Erda

, th e dept h o f alluvia l material s ove r bedrock i s 260 0 feet

. Bedrock near t h e lake

, a t th e norther n en d o f th e valley

, range s fro m 350 0 t o 710 0 fee t belo w groun d surface

. T h e Occidenta l fault ha s been mappe d alon g th e easter n boundar y o f th e valle y an d passe s jus t east o f th e smelte r an d Erd a area

. Thi s faul t ha s displace d th e alluvia l fil l along th e foothills

. Geologi c report s indicat e tha t th e Occidenta l faul t ha s a norma l displacemen t wit h upthrow n sid e t o th e east

. I t is speculate d tha t thi s fault may have some influenc e o n groundwate r movemen t bu t apparentl y doe s no t ac t as a barrie r t o groundwate r movemen t i n the area

. T w o stream s whic h travers e th e sit e discharg e snow mel t wate r an d rainfal l fro m Pin e Canyo n an d Dry Creek Canyon

. Pin e Canyon' s cree k ha s perennia l flo w du e t o spring s locate d withi n th e canyo n an d drainag e fro m th e Wes t Di p Tunnel

. Wes t Di p wate r i s pipe d fro m th e tunne l i n Pol e Canyo n int o th e Pin e Canyo n Creek

. 3 . 2 Hydrolog y 3.2. 1 Regiona l Groun d Wate r Hydrolog y Log s compile d during installatio n o f area well s generall y indicat e tha t th e valley

- margi n deposits

, a s describe d above,.ar e comprise d o f san d an d grave l wit h varyin g amount s o f sil t an d cla y whil e th e deposit s towar d th e cente r o f th e valle y ar e predominantl y sil t an d clay wit h san d interbeds

. Smalle r strea m channe l an d colluvia l deposit s locall y interfinge r wit h th e alluvia l an d lacustrin e deposits

. Th e strea m channe l deposit s ar e typicall y wel l sorte d an d ver y permeabl e whereas th e 

### colluvia l deposit s ar e poorl y sorte d an d have lo w permeability

. Alon g th e benc h areas , wher e th e IS& R Smelte r sit e resides

, groun d wate r occur s unde r watertabl e condition s i n th e valle y margi n deposit s which consis t mostl y o f alluvia l fa n an d beac h material

. Thes e deposit s thicke n rapidl y an d ar e ver y permeable

, wit h transmissivitie s o f 60,00 0 gpd/f t no t uncommon

. Th e groun d wate r in th e valle y margi n area s i s recharge d largel y b y seepag e o f strea m wate r an d irrigatio n wate r an d predominantl y b y subsurfac e flo w fro m th e bedroc k o f th e mountai n fronts

. Recharg e fro m direc t precipitatio n alon g th e valle y margin s wa s estimate d b y Raze m an d Steige r t o b e 3 percen t o f th e annua l precipitatio n fallin g a t thes e elevations

. Th e valle y margi n unconfine d groun d wate r is generall y quit e dee p (+40 0 feet ) an d move s dow n di p towar d th e cente r o f th e valle y an d th e Grea t Sal t Lake

. A s th e groun d wate r move s int o th e valley

, it becomes confine d b y th e clay-ric h lacustrin e deposits

, resulting i n artesia n condition s throughou t mos t o f th e Atlanti c Richfield Compan y 7

Marc h 12,200 2GREAT SALT LAKE

IS4R/CAR R FOR K SMELTE R SIT E

ANDERSO N

Betwee n 0 an d 50 0 fee t (15 0 meters ) o f valle y fil l saturate d wit h water containin g les s tna n 100 0 i H mg/ l o f dlsorve d solids

. Betwee n 50 0 an d 100 0 lae t (15 0 an d 30 0 meters ) rr- T

at valle y ffl l saturate d wit h wate r containin g los s

_ tha n 100 0 mg/ l o f dlsotve d soOds

. Valle y fil l saturate d wit h water containin g mor e than 100 0 mg/ l o f disotvo d solid s or wate r qualit y unknown

. TOOELE VALLEY GEOLOG Y Groundwate r Area Boundar y a s denne d I n USGS

, Tec h Pu b No

. 6 9 EHOA

. LINCOLN

. » TOOELE

. UTA H

97-06W H 4-MARO4300 2 A 6 SHOW N FIGUR E 

# 3 3IS& R / Car r For k Remedia l Investigatio n Site Groundwate r Conceptua l Mode l
valle y floo r includin g th e Erd a area

. 3.2. 2 Sit e Subsurfac e Hydrolog y T h e Car r For k propert y is locate d i n th e eas t Tooel e Valley groun d wate r district

. T h e tw o majo r facilities

, th e IS& R Smelte r sit e an d th e IS&R/Car r For k tailings

, wer e locate d o n alluvial-fa n an d lacustrin e deposits

. Bechte l (1977 ) describe d th e bul k o f th e unconsolidate d materia l underlying th e tailing s area a s alluvia l fa n detritu s which consist s o f crudel y stratified

, poorl y t o partl y sorte d clay

, silt

, san d

a n d grave l layers

. Th e alluvia l materia l wa s estimate d b y Bechte l (1977 ) t o b e more tha n 70 0 fee t thic k i n th e vicinit y o f th e tailings

. Wahle r (1977 ) presente d gravit y dat a which indicate d tha t th e thicknes s o f unconsolidate d materia l unde r th e EIto n Tunne l porta l wa s approximatel y 1,80 0 feet

. Wahle r (1977 ) als o estimate d th e thicknes s o f alluviu m unde r th e smelte r sit e t o b e approximatel y 1,40 0 feet

. This is due

, in part
, t o th e locatio n o f th e propert y o n th e dow n droppe d side s o f tw o majo r faul t system s whic h intersec t southeas t o f th e smelter

. Th e surficia l deposits

, i n th e are a o f th e tailings

, ar e comprise d o f lacustrin e fin e graine d san d wit h interbed s o f sil t an d gravel

. Th e edg e o f th e beac h deposi t i s locate d a t th e base o f th e bluff s abou t 2,00 0 fee t t o th e northwes t o f th e smelter

. A t thi s locatio n th e lacustrin e deposit s have a thi n edg e an d thicke n t o a dept h o f abou t 5 0 fee t unde r th e tailin g dam

. Th e alluvia l an d lacustrin e deposit s ar e traverse d b y th e strea m deposit s o f D r y an d Pin e Creeks

. Muc h is know n abou t th e geohydrolog y o f th e propert y throug h th e soi l testing an d groun d wate r monitorin g well s drille d b y Anacond a during operations

. Th e 197 7 Wahle r report s include s dat a fro m pum p test s o f th e 16-inc h Boy s Ranch wel l usin g t h e 6-inch Boy s Ranch wel l a s th e observatio n well

. Thi s tes t indicate d tha t th e stati c wate r leve l was a t a dept h o f 575 fee t an d tha t th e transmissivit y was 844,00 0 gpd/ft

. Wahle r (1977 ) estimate d tha t approximatel y 12,00 0 acre-fee t pe r yea r wa s recharge d t o th e watertabl e aquife r i n th e vicinit y o f Pin e Canyon

. Potentiometri c contour s calculate d b y Raze m (Raze m 1981 ) indicate

, i n general

, wate r beneat h th e IS& R flow s i n a northwesterl y directio n toward s th e Grea t Sal t Lake

. Flow s originating in th e Oquirrh s in thi s northeas t par t o f th e valle y ar e bounde d b y th e bedroc k Oquirrh mountai n interfac e on the eas t and on the wes t b y a groun d wate r moun d forme d b y th e muc h greate r annua l recharg e (26,00 0 acre-feet ) a t th e mouth s o f Settlemen t an d Middl e Canyons

. Simila r t o Middl e Canyon

, th e mout h o f Pin e Canyo n may als o have a groun d wate r moun d create d b y th e surfac e wate r flowin g i n th e canyon

. Unde r nativ e conditions

, withou t th e artificia l flo w create d b y min e de-watering

, th e strea m recede s int o th e groun d befor e th e wes t Atlanti c Richfiel d propert y line

. Durin g min e de-watering

, flo w wa s discharge d dow n Pin e Canyo n wit h excess wate r historicall y bein g used f o r irrigatio n i n th e Lincol n an d Erd a area

. 3.2. 3 Recharg e Recharg e t o th e aquifer s is primaril y b y flo w fro m th e Oquirrh rang e consolidate d

roc k wit h a smalle r amoun t by surfac e flo w infiltration

. Th e potentia l fo r surfac e Atlanti c Richfield Compan y 8

Marc h 12,200 2IS& R / Car r For k Remedia l Investigatio n Site Groundwate r Conceptua l Mode l

wate r recharg e o f th e aquife r i n th e interfluvia l portion s o f th e sit e wa s investigate d b y Wahle r (1977 ) wh o presente d dat a fro m othe r workers (Freez e an d Banner

, 1970 ) an d Isaacso n e t al.

, 1974 ) t o show tha t direc t recharg e via infiltratio n o f precipitatio n wa s unlikely

. The y base d thi s conclusio n o n dat a fro m soi l sample s obtaine d o n th e propert y tha t ha d averag e moistur e content s o f approximatel y 8 percen t a t a dept h o f 5 fee t an d fiel d capacitie s o f approximatel y 1 7 percent

. Thi s moistur e deficienc y was base d o n th e ne t negativ e precipitatio n regim e cause d b y evapotranspiratio n exceedin g precipitatio n b y 2 3 inche s annually

. The y als o calculate d tha t th e unsaturate d zone underlying th e propert y ha d th e retentio n capacit y o f an averag e o f 6 0 acre-fee t pe r acre

. Anothe r possibl e sourc e o f recharg e wa s histori c min e wate r discharg e fro m pas t min e an d smelte r operations

. Th e Elto n Tunne l discharge d wate r a t a n averag e rat e o f abou t 5 cf s fro m 194 1 throug h 195 8 afte r whic h th e tunne l wa s plugge d b y cavin g ground

. Th e Pin e Canyo n Tunne l bega n discharging min e wate r i n 197 2 an d average d 5 cf s fro m 197 7 t o 197 8 whil e wate r in th e ol d min e working s ope n t o th e Ape x Shaf t wer e pumpe d out

. A pumpe d flo w o f approximatel y 3- 4 cf s wa s maintaine d during operatio n o f th e Car r For k Min e unti l th e pump s wer e shu t of f i n 1984

. Althoug h Anacond a stoppe d minin g activitie s earlie r tha n 1984
, th e wate r continue d t o be pumpe d in th e even t tha t meta l price s recovere d enoug h t o once agai n star t operations

. I n 198 4 th e pumpin g wa s discontinue d an d th e shaf t wa s allowe d t o flood

. Mos t o f thi s min e wate r wa s utilize d fo r irrigatin g an d agricultura l lan d i n th e Lincoln-Erd a area

. Bechte l (1977 ) conducte d fiel d an d laborator y permeabilit y test s o n th e IS& R tailing

, alluvia l materials

, an d lacustrin e deposit s tha t

covered th e property

. Th e result s o f thi s tes t wor k ar e show n in Table 3- 1 an d Tabl e 3-2

. This dat a indicate s tha t th e alluvia l deposit s an d th e wel l sorte d lacustrin e sand s ar e moderatel y t o highl y permeable

, an d th e IS& R tailing s have a lo w permeability

.

Atlanti c Richfield Compan y 9

Marc h 12,200 2IS& R / Car r For k Remedia l Investigatio n Site Groundwate r Conceptua l Mode l Table 3- 1 Fiel d Soi l Permeabilitie s (fro m Bechtel

, 1977 Fiel d Horizonta l K Value s (ft/yr ) Materia l Tailing s Lacustrin e Deposit s Alluvia l Deposit s N o

. o f Test s 2 1 5

1 1 Max

. 600 11,000 + 13,300 + .Min

. 40 0 100

25 0 Media n 500 1,80 0
4,60 0 Avg

. 500 3,35 0
4,87 0 Fiel d Vertica l K Value s (ft/yr ) Materia l Tailing s Lacustrin e

, Deposit s Alluvia l Deposit s N o

. o f Test s 2 1 4

1 1 Max

. 12 0 5,50 0
2,65 0 Min

. 8 0 2 0

5 0 Media n 100 70 0

77 0 Avg

. 100 1,30 0

95 0 'Note : 1 ft/y r equal s 1. 0 xlO"6 cm/sec

. Tailing s dat a refe r t o in-plac e IS& R tails

. Table 3- 2 Laboratory Soi l Permeabilitie s (fro m Bechtel

, 1977 ) Materia l Gravell y Sand s Silt s Silty Sand s IS& R Tail s Vertica l

K (ft/yr ) 2

; 000lb/ft 2 surchara e 1,20 0 2 0 1,10 0 5 Vertica l

K (ft/yr ) 4,000-6,00 0 Ib/ft 2 surchara e 30 0 1 55 0

no dat a

3 . 3 Groundwate r

Chemistr y 3.3. 1 IS&R/Car r For k Site Are a 3.3.1. 1 Regiona l Groundwate r Chemistr y Groundwate r i n th e basi n fil l aquife r i n th e Tooel e Valle y generall y range s betwee n calciu m magnesiu m bicarbonat e typ e an d sodiu m chlorid e type

. I n addition

, som e area s contai n wate r which represent s a mixtur e o f th e tw o type s wit h sulfat e bein g on e o f th e majo r ions

. I n general

, wate r i n th e southwester n par t o f th e valle y i s o f th e calciu m bicarbonat e type
, an d wate r i n th e norther n an d middle part s o f th e valle y is o f th e sodiu m chlorid e type

. Usuall y th e bicarbonat e typ e wate r is representativ e o f recharg e areas , which ma y b e indicativ e o f th e predominatel y carbonat e bedrock in th e area

. Th e wate r qualit y i n th e recharg e zone is generall y goo d wit h TD S

Atlanti c Richfield Compan y 1 0 Marc h 12,200 2IS& R / Car r For k Remedia l Investigatio n Site Groundwate r Conceptua l Mode l
value s o f 1,00 0 pp m o r less

. A s wate r move s throug h th e valle y fill

, i t tend s t o pic k u p additiona l dissolve d solid s an d become more sodiu m chlorid e rich

. Wate r produce d in th e middl e o f th e valle y i s o f lowe r qualit y wit h IDS value s o f 1,00 0 t o 3,00 0 ppm

. 3.3.1. 2 Groundwate r

Chemistr y - IS& R Sit e an d Lincol n 

### Historica l dat a collecte d t o date

, b y a multitud e o f organizations
, fro m existing well s indicat e tha t ther e is minima l evidenc e o f impac t fro m smelte r operation s o n loca l o r regiona l groundwater

. Well s used t o monito r th e smelte r operation s impac t during operation s an d sinc e ar e liste d below

. Als o liste d i s th e numbe r o f sampl e record s fo r eac h wel l which exceed MC L standards

. Table

3- 3 Groundwate r Monitoring Historica l Exceedance s Curren t Nam e

6 " Boy s Ranch Wel l (AE-GW-1)

16 " Boy s Ranc h Wel l (AE-GW- 1 B )

Sager s Wel l (AE-GW-2 )
Tailing s Da m Wel l (AE-GW-4 ) USGS Wel l (AE-GW-USGS ) USG S Designatio n 3-4- 1 2dcc- 1

3-4- 1 3abb- 1

3-4-14abd- 1

3-4- 1 3cdb- 1

3-4- 1 Oddd- 1 Prio r

Designation s GW-3(JBR1985 ) AC-GW-4(DER R 1995 )

GW- 1 (JB R 1985 )

GW-2(JB R 1985 ) AC-GW-2(DER R 1995 )

GW- 4 (JB R 1985 )
AC-GW- 1 (DER R 1995 ) Drinkin g Wate r Exceedance s ( 4 ) A s 198 2 170pp b 199 5 150pp b 200 1 139pp b P b 1982 22 0 pp b (11 ) A s 197 3 21 0 pp b 197 3 35 0 pp b 197 4 82 ppb 200 1 18 0 pp b P b 197 3 4 5 pp b 197 3 3 3 pp b 197 5 2 0 ppb 1977 2 8 pp b N 0

3 197 3 16. 7 pp m 197 3 16

. 6 pp m 197 4 17. 5 pp m ( 3 ) P b 197 3 3 0 ppb N O

3 197 4 15. 6 pp m 1977 10

. 5 ppm ( 0 )
( 0 )

Atlanti c Richfield Compan y 1 1 Marc h 12,200 2IS& R / Car r For k Remedia l Investigatio n Site Groundwate r Conceptua l Mode l A s show n i n Table 3-3
, ther e is limite d histori c evidenc e tha t th e groundwate r i n th e vicinit y o f th e Sit e ha s been impacted

. Al l bu t on e o f th e elevate d lea d level s wer e fro m sample s collecte d i n th e 1970s

. Th e las t elevate d lea d leve l was a concentratio n o f 22 0 pp b in th e 6-inch Boy s Ranch wel l i n 1982

. Th e fiv e elevate d nitrat e concentration s wer e als o encountere d i n sample s collecte d fro m 197 3 throug h 1977

. Elevate d level s o f arseni c have bee n encountere d in th e tw o Boy s Ranc h well s (6-inc h an d 16-inch ) of f

a n d o n fro m th e 1970' s throug h th e presen t recent samplin g conducte d i n Decembe r 2001

. Groundwate r in th e are a o f th e sit e an d in th e tow n o f Lincol n have als o exhibite d elevate d level s o f sulfat e (15 0 t o 38 0 mg/L ) an d TDS (48 0 t o 62 5 mg/L ) i n th e past

. Recent sample s collecte d i n Decembe r 200 1 generall y indicat e sulfat e level s betwee n 10 0 an d 20 0 mg/ L an d TDS level s o f 40 0 t o 50 0 mg/L

. • T h e sourc e o f th e sulfate s in groundwate r ha s bee n th e subjec t o f pas t studies

. Gate s (1965 ) an d Raze m an d Steige r (1981) suggeste d tha t th e elevate d sulfate s i n th e groundwate r near Pin e Canyo n coul d b e th e resul t

o f min e de-waterin g fro m th e ISR/Car r For k minin g operations

. A stud y conducte d b y W.A

. Wahle r an d Associate s (1977 ) foun d tha t th e de

waterin g coul d b e a n explanation

, howeve r suggest s alternativ e caus e ma y ^ b e a link betwee n th e well s containin g elevate d sulfat e level s wit h th e j proximit y o f known faults

. I t i s suggeste d tha t perhap s groundwate r flow s j fro m mineralize d zones upwar d alon g fault s an d relate d structure s result s i n elevate d sulfate s i n groundwater

. Wells containin g elevate d sulfat e level s a r e foun d i n clos e proximit y t o th e faults

. 3.3. 2 Erd a Are a Groundwate r in th e Erd a are a i s a mixtur e o f bicarbonat e an d sodiu m chlorid e types
, wit h som e well s exhibiting highe r sodiu m chloride

, probabl y du e t o heav y loca l pumpin g fo r agricultura l use , an d hig h sulfat e level s (greate r tha n th e secondary drinkin g wate r leve l o f 25 0 mg/ L an d u p t o 1,20 0 mg/L)

. Ther e i s a genera l correlatio n betwee n elevate d chlorid e concentration s an d elevate d nitrat e level s in th e same samples

, which ma y indicat e a lin k t o domesti c sewag e sources

. Conversely

, when sulfat e level s ar e belo w th e secondary leve l o f 25 0 mg/L

, nitrate s a r e als o belo w th e drinking wate r standar d o f 1 0 mg/L

. Level s o f tota l dissolve d solid s (TDS ) have been foun d t o b e above th e secondary drinking wate r standar d

o f 50 0 mg/L

. Metalli c element s i n well s i n th e Edr a Are a have alway s been belo w th e MC L wit h t h e exceptio n o f Arseni c hit s (>20 0 ppjft ) a t th e Pric e wel l i n 2001

. Steige r an d Lowe (1997 ) reporte d tha t seven wells

, locate d east o f Erda

, ha d nitrat e plu s nitrit e concentration s greate r tha n th e MCL

. Tw o o f thes e well s wer e sample d fo r Nitroge n 1 5 isotope

. Th e USG S foun d tha t th e isotopi c nitroge n content s wer e consisten t wit h contaminatio n fro m septi c system s an d cultivated

, irrigate d field s tha t have natura l organi c materia l i n th e soil

. However

, the y admittedl y di d no t know wha t th e Atlanti c Richfield Compan y 1 2

Marc h 12,200 2IS& R / Car r For k Remedia l Investigatio n Site Groundwate r Conceptua l Mode l isotopi c characte r o f minin g relate d nitroge n wa s an d coul d no t definitel y determin e i f thei r isotopi c dat a rejecte d th e possibilit y tha t th e nitrat e contaminatio n coul d hav e com e fro m th e Car r For k site

. Th e Car r For k sit e wa s mentione d a s a concer n becaus e the y ha d bee n tol d b y Hele n Sadik-MacDonald (DERR ) tha t ther e wer e elevate d nitrat e concentration s i n lysimeter

, non-saturate d zone wate r sample s obtaine d fro m th e Car r For k site

. 3. 4 Potentia l Chemica l Source s an d Pathway s Thi s sectio n describe s th e relativ e potentia l fo r sit e an d non-sit e sources t o contribut e t o th e limite d groundwate r impact s a s describe d i n Sectio n 3.3

. Th e Groundwate r Source/Mechanis m Diagram

, Figur e 3.1
, illustrate s th e possibl e sources o f th e potentia l impac t t o groundwate r associate d wit h th e IS&R/Car r For k operation

. Als o show n ar e th e releas e mechanism s b y which a n impac t coul d occur

. Th e sources an d mechanism s show n a r e furthe r describe d an d discusse d throughou t th e tex t o f thi s repor t starting i n Sectio n 3.4.1

. Thes e section s provid e a n interpretatio n o f th e relativ e potentia l fo r sources an d pathway s t o contribut e t o th e limite d groundwate r concerns a t o r nea r th e site

. 3.4. 1 IS&R/Car r For k Vicinit y 3.4.1. 1 Min e De-waterin g an d Pin e Canyo n Wate r Settlin g Pond s Durin g de-waterin g operation s o f th e Car r For k Mine

, wate r pumpe d fro m undergroun d working s was transporte d dow n th e canyo n in a concret e flum e whic h discharge d int o th e Pin e Canyo n Cree k channe l above th e slag pile

. Th e wate r flowe d pas t th e sla g pil e t o a strea m diversio n belo w th e sla g where th e flo w i n th e strea m wa s directe d int o a series o f settlin g pond s northeas t o f th e Car r For k tailings

. Th e settle d solid s wer e retaine d i n th e pond s an d th e clarifie d wate r was discharge d bac k t o th e strea m channe l where i t coul d be use d fo r irrigatio n purposes

. Pumpin g bega n in 197 1 an d average d 5 cf s fro m 197 5 t o 1978

. Pumpin g continue d a t a rat e o f abou t 3 t o 4 cf s unti l al l pumping ceased in Februar y 1985

. Anacond a record s indicate d tha t initia l pumpin g an d a follo w u p monitorin g sampl e tw o month s late r fro m th e Ape x Shaf t i n 1971 produce d wate r wit h 

### t h e followin g characteristics : , "

~

^

_ Table 3- 4 Ape x Shaf t Wate r Qualit y Paramete r Arseni c Cadmiu m Lea d Nitrat e Sulfat e Zin c p H 6 /1

2/7 1 (mg/l ) 0.3 5
, N D 42. 9 55. 0 3,59 8 96. 2 5. 6 •8/4/7 1

(mg/l ) 2.8 8 0.0 5 N D 2.4 2 3,520 ! 112. 0 5. 8 Atlanti c Richfiel d Compan y 1 3 Marc h 12,200 2

# ,

^

in z 0 

# 1

L J &

u o c O 

### f t X

I / ) U J u Q£ 

## i £

w
ac U J

u j X I / I POTENTIA L SOURCE S HISTORIC CAR R FOR K MIN E DISCHARG E

HISTORI C SMELTE R OPERATIO N WATE R DISCHARG E

TAILIN G POND S

SITE SOI L

SLA G PIL E

LANDFILL S

SPECIA L WAST E CEL L

AGRICULTURA L FERTILIZE R

SHALLO W SEPTI C SYSTEM S

NATURA L MINERALIZATION / BACKGROUN D IN SOI L — — I

— | 

### FIGUR E

3.1

. GROUNDWATE R

SOURCE/MECHANIS M

DIAGRA M NOTE : THI S DIAGRAM ILLUSTRATE S TH E RANG E O F POSSIBL E SOURCES

. PATHWAYS

. AN D EXPOSUR E MECHANISM S

T O POTENTLAL GROUNDWATE R CONCERNS

. RECEP

T HUMA N RELEAS E SECONDAR Y

^EASE *' PATHWA Y EXPOSUR E ARE A SIT E SIT E UECHANK U SOURC E

UFf-HAKIISU fAIHWAT ROUT £ RESIDENT

S VISITOR S WORKER S O

R ECOLOGICAL TERRESTRIA L AQUATI C

I

u f LmJT

P E T O F piMr l

. PIN E u

INFILTRATION/

1' u

[GROUND ] INGESTIO

N •'' " I " CR T EEK mi: J CREE K

[

PERCOLATIO

N J

, [jtfATER

j DIREC T

CONTAC T •

INFILTRATION/

1 or,, ,

INFILTRATION/

1 t [GROUND ^ INGESTIO N •' 1 { PERCOLATIO N

J " 0 L [ PERCOLATIO N

J ^WATER

j D.REC

T CONTAC T •

LEGEN

D i = Incomple l O
= Exposur e 9 = Exposur e (Inciden t • = Exposur e (Direc t 1

INFILTRATION/1

„. . flNFILTRATION/ l (GROUND

] INGESTIO N •'' [PERCOLATION ]

- O I L [PERCOLATION

] ^WATER J

DI RECT

CONTACT •

f DESORPTION/

1 fOROUND l INGESTIO N •'' [ PERCOLATIO N

J 1 WATER J DIREC

T CONTAC T • 1 i 1 I

I i 1 i

> o r virtuall y Incomplet e potentia l relativel y lo w potentia l Intermediat e il Ingestlon/Contact

) potentia l relativel y hig h igestlon/Contoct )

i i i i

i i i
, Central Note s ~ "

No

. RBvtaton/lssu e

Dat e , IS&R/CAR R FOR K SMELTE R SrT E TOOELE

, UTA H ATLANTI C RICHFIEL D COMPAN Y MONTAN A



### ANDERSO N

CNOINEEniN O

COMPANY

, INC

. 17 7 w w ti n teat* SAL T LAK E OTT

. UTA H 64M B (801 ) m-« m

^ J

r > FIGUR E 3. 1 GROUNDWATE R CONCEPTUA L SIT E DIAGRAM

r DRAW N BT : CN F ^ CHECKE D BY : SO A APPROVED ; SD A RLE : GmnDMIt r CtraiAa l Mafeldvi g
"* " 97-06M 4 "*"

" O H 04-Marcn-20(1 2 S 1 NoSca h ^ \

\

/IS& R / Car r For k Remedia l Investigatio n Sit e Groundwate r Conceptua l Mode l Wate r qualit y i n th e Car r For k min e de-waterin g progra m apparentl y 

### improve d ove r tim e likel y du e t o dilutio n o f th e stagnan t wate r i n th e ol d min e working s fro m inflo w throug h th e hos t roc k during de-watering

. T h e wate r qualit y o f th e influen t an d effluen t fro m th e settlin g pond s wa s monitore d b y Anacond a during operation s an d som e o f thes e dat a wer e presente d i n th e reclamatio n pla n fo r th e sit e (JBR

, 1986)

. Th e concentration s fo r th e influen t wate r qualit y ar e show n i n Table 3-5

. Table 3- 5 •Settling Pon d Influen t Wate r Qualit y Cone

, (mg/l ) Averag e Maximu m Minimu m Std

. Dev

. M C L Arseni c 0.003 8 0.01 6 0.00 1 0.00 3 0.0 5 Lea d
0.0571 0.14 6 0.00 8 0.03 9 0.015 Zin c 0.070 8 0.38 5 0.00 6 0.07 8 N S Coppe r 0.025 2 0.09 6 0.007 0.01 7 1. 3 Cadmiu m 0.012 3 0.03 2 0.00 1 0.00 8 0.00 5 P H

8. 1 10. 2 7. 5 0.5 8 6.0-9. 0 Thes e dat a indicat e tha t th e averag e an d maximu m influen t wate r concentration s int o th e settling pond s wer e above th e MCLs fo r lea d an d cadmiu m bu t belo w MCL' s fo r arsenic
, copper
, an d zinc

. Revie w o f dat a fo r nitrat e influen t concentration s t o th e pond s fo r th e perio d fro m 197 9 t o 198 3 produce s th e result s in Table 3- 6 Table 3- 6 Settlin g Pon d Influen t Nitrat e 1979-198 3 Concentration s (mg/l ) Averag e Maximu m Minimu m Standar d Deviatio n M C L Nitrat e

3.6 5 9.7 3 0.0 3 2.4 5 1 0 Dat a fro m 7 0 measurement s fro m 1/7 9 t o 2/8 3 Thes e dat a indicat e tha t th e nitrat e concentration s fluctuate d widel y during operation s o f th e Car r For k min e in 197 9 t o 198 3 bu t th e averag e concentratio n wa s les s tha n 4 mg/l

. Wate r chemistr y dat a fo r th e beginning o f th e Ape x shaf t de-waterin g proces s showe d a nitrat e valu e o f 5 5 mg/ l o n 6/12/7 1 whe n pumpin g initiated

. However

, withi n tw o month s th e nitrat e valu e o n 8/4/7 1 ha d
Atlanti c Richfield Compan y 1 4 Marc h 12,200 2IS& R / Car r For k Remedia l Investigatio n Site Groundwate r Conceptua l Mode l droppe d t o 2.4 2 mg/l

. T h e settlin g pond s wer e no t line d an d seepag e fro m thes e pond s coul d have been a potentia l sourc e o f groun d wate r impact s i n th e past
, thoug h th e constituen t concentration s o f th e influen t wate r d o no t indicat e thi s wate r is a concern

. Raze m an d Steige r (1981) attribute d a genera l increas e in groundwate r level s i n th e Lincoln-Erd a area t o Car r For k min e de-waterin g 

### water

. T h e precipitate d sludg e i n th e bottom s o f thes e pond s wa s sample d b y JB R (1986)

. Saturate d past e extrac t dat a showe d tha t solubl e metal s concentration s wer e lo w fo r al l th e metal s o f concern

. I n particular

, arseni c concentration s wer e a t o r belo w 0.01 mg/l

, cadmiu m 0.0 7 mg/l

, an d lea d 0.1 1 mg/l

. Thes e sludge s d o no t appea r t o presen t a sourc e o f groundwate r impact

. T h e settlin g pond s handle d a ver y larg e quantit y o f wate r whic h slightl y exceede d MCL s fo r lea d an d cadmiu m bu t di d no t excee d MCL s fo r arseni c a n d nitrates

. Th e wate r seepin g fro m thes e ponds

, an d seepin g int o th e groun d i n th e irrigate d field s nort h o f th e Site

, coul d have possibl y contribute d lead

, cadmium

, arsenic an d nitrat e int o th e loca l groundwate r bu t thi s likel y di d no t resul t i n exceedance s o f MCL s fo r arseni c o r nitrat e becaus e thei r concentration s wer e to o lo w i n th e pon d water

. Th e pond s have no t been used sinc e de-waterin g wa s discontinue d fo r th e Car r For k Min e i n 198 5 an d the y have been reclaime d s o an y impac t t o groundwate r fro m thes e pond s i s in th e past

. T h e settlin g pond s ar e no t likel y a sourc e o f nitrat e o r arsenic contaminatio n recentl y observe d in th e Boy s Ranc h well s an d d o no t have th e potentia l fo r bein g a n ongoin g sourc e o f thi s contamination

. Wate r fro m thes e pond s tha t

w a s discharge d t o th e irrigate d fields wa s no t likel y th e sourc e o f th e nitrat e groundwate r contaminatio n currentl y observe d in th e Erd a are a becaus e th e nitrat e concentration s i n th e wate r discharge d fro m th e pond s wa s lowe r tha n th e groundwate r contaminatio n observe d i n Erda

, an d th e duratio n o f tim e o f th e relativel y larg e discharg e was shor t an d ove r 3 0 years ago

. 3.4.1. 2 Slag Pil e T h e slag pile wa s deposite d i n th e Pin e Canyo n drainag e over th e operationa l lif e o f th e IS& R Smelte r complex

. Th e pile consist s o f slag fro m t h e reverb an d blas t furnaces

, which was dumpe d in molte n for m a t th e sla g pile

. Ther e \ s als o fin e granularmateria l mixe d i n wit h th e slag

, whic h may 

### b e fl y as h and/o r flu e dust

. Th e sla g materia l i s a basalt-lik e t o glass y materia l tha t i s elevate d in tota l metal s bu t thes e metal s wer e foun d non

leachabl e fro m th e slag (JBR

, 1986)

. Th e highe r leachabl e concentration s wer e foun d t o occur i n th e fin e granula r materia l withi n th e sla g an d thi s materia l als o ha d a ne t aci d generatin g potentia l (se e Table s 3- 7 an d 3- 8 )

.

Atlanti c Richfield Compan y 1 5

Marc h 12,200 2IS& R / Car r For k Remedia l Investigatio n Site Groundwate r Conceptua l Mode l Tabl e 3- 7 Sla g Tota l Metal s (JB R 1986 ) Cone

, (mg/kg ) Averag e Minimu m Maximu m Arseni c
280 11 0 38 0 Cadmiu m
3 0 1 1 4 0 Coppe r 3,02 6 1,73 0 3,78 0 Mercur y
0.1 5 0.1 1 0.2 Lea d
10,88 3 8,90 0 13,10 0 Table 3- 8 Sla g E.P

. Toxicit y (JB R 1986 ) Cone

, (mg/l ) Averag e Minimu m 

### Maximu m Arseni c 0. 1 <0. 1 0.2 3 Cadmiu m 0.1 2 0. 1 0.15 Chromiu m 0.0 1 <0.01 0.0 2 Mercur y O.000 1 <0.000 1 O.000 1 Lea d

1. 3 0. 5 2. 6 T h e slag pile wa s apparentl y buil t ou t ove r th e origina l Pin e Cree k strea m channe l which resulte d i n pushing th e cree k t o th e north

. Th e ol d channe l deposit s wer e burie d b y th e sla g an d a remainin g expressio n o f thi s histori c flo w regim e wa s a spring tha t flowe d fro m th e wes t to e o f th e slag pile i n th e approximate positio n o f th e ol d cree k channel

. This spring wa s sample d a s SW- 7 i n 198 5 befor e an d durin g th e 198 6 reclamatio n o f th e Site

. Th e 8/22/8 5 sampl e o f SW- 7 showe d elevate d arseni c (0.03 2 mg/l)

, cadmiu m (0.2 6 mg/l)

, nicke l (0.10 2 mg/l)

, an d zin c (8. 4 mg/l ) concentration s (JBR

, 1986)

. Late r sample s o f thi s same spring in 198 7 showe d lowe r arsenic
, 

### cadmium

, nicke l an d zin c concentration s compare d t o befor e th e 198 6 reclamation

. Th e spring drie d u p i n Augus t 198 7 an d ha s no t flowe d sinc e tha t tim e (JBR

, 1990)

. I t is believe d tha t thi s is th e resul t o f th e 198 6 reclamatio n wher e th e slag pil e wa s capped

, resulting i n most meteori c wate r bein g discharge d b y evapotranspiration

. T h e presenc e o f th e elevate d metal s i n th e 198 5 sampl e fo r SW-7

, an d th e presenc e o f th e slag wast e i n th e histori c Pin e Creek channe l indicate s th e sla g pil e ma y b e a potentia l sourc e o f surfac e wate r an d groundwate r impact

. T h e slag pile contain s material s wit h relativel y elevate d concentration s o f tota l metal s an d th e fin e granula r materia l i n th e pil e ha s solubl e meta l content
, ye t th e arseni c concentration s in th e slag materia l i s relativel y low

. T h e sla g wa s know n in th e pas t t o b e in contac t wit h shallo w groundwate r a t it s wes t sid e (SW-7)

. Th e shallo w wate r tabl e ha s apparentl y droppe d a s 

### SW- 7 ha s no w drie d up

. Sla g pile impact s woul d most likel y b e limite d t o cation s an d anions attributabl e t o metalli c compound s an d woul d no t likel y Atlanti c Richfield Compan y 1 6 Marc h 12,200 2IS& R / Car r For k Remedia l Investigatio n Site Groundwate r Conceptua l Mode l includ e sources o f nitrat e o r arsenic

. Surfac e wate r samplin g above an d belo w th e slag pile a s outline d i n th e Fiel d Samplin g Pla n wil l provid e informatio n o n whethe r o r no t th e slag is impactin g Pin e Creek

. 3.4.1. 3 Pin e Canyo n Landfil l T h e Pin e Canyo n Landfil l consist s o f a wid e variet y o f debri s an d granula r materia l tha t ma y includ e flu e dust

, furnac e brick

, laborator y waste
, cinders

, slag (JBR

, 1986)

. Th e wast e materia l i n th e landfil l ha s been show n t o have hig h level s o f tota l metal s wit h elevate d level s o f solubl e metal s (se e Table s 3 - 9 an d 3-10)

. Aci d Base Potentia l testing o f th e landfil l wastes
, i n 1985
, showe d tha t they wer e aci d generating

. Th e soil s unde r th e waste s wer e show n t o have ne t neutralizing capacit y an d assay s o f th e foundatio n soil s indicate d tha t meta l concentration s decrease d significantl y fro m th e waste s dow n int o th e foundatio n soils

. Th e lowe r portion s o f th e wast e wer e saturate d in 1985

. Durin g reclamation

, th e lowe r portio n o f th e wast e was draine d wit h a frenc h drai n an d th e draine d wast e wa s excavate d an d relocate d u p th e hil l awa y fro m th e strea m channel

. Table 3- 9 Pin e Canyo n Landfil l Tota l Metal s (JB R 1986 ) Cone

, 

### (mg/kg ) Averag e Minimu m Maximu m Arseni c 3,37 0 2 5 10,20 0 Cadmiu m 651 2 0 3,25 0 Coppe r 9,403 12 5 28,60 0 Mercur y 1.9 9 0.0 2 14. 7 Lea d
48,550 30 0 96,80 0 Table 3-1 0 Pin e Canyo n Landfil l E.P

. Toxicit y Cone

, (mg/l ) Averag e Minimu m Maximu m Arseni c 0.14 1 0. 1 0.42 8 Cadmiu m 1.0 5 0. 1 3.4 9 Chromiu m 0.01 2 0.01 0.01 8 Mercury 0.000 5 0.000 1 0.002 1 Lea d

3.8 2 0. 5 14. 9 Seep s an d spring s alon g th e to e o f th e landfill-historicall

y forme d a smal l strea m tha t flowe d int o Pin e Canyo n Creek

. Th e sampl e SW-1 3 wa s take n fro m thi s strea m i n 1985

. Sampl e SW-1 3 showe d a lea d concentratio n above th e MC L (0.07 5 mg/l ) an d elevate d TDS

. Simila r t o th e seep s belo w t h e sla g pile

, seep s fro m th e landfil l cease d t o flo w shortl y followin g cappin g o f th e landfil l during sit e reclamatio n i n 1986

. T h e presenc e o f hig h concentration s i n SW-1 3 o f metalliferou s an d aci d
Atlanti c Richfield Compan y 17 Marc h 12
, 200 2IS& R / Car r For k Remedia l Investigatio n Sit e Groundwate r Conceptua l Mode l generatin g material s i n th e landfil l waste
, an d th e fac t tha t th e wast e wa s a t

o n e tim e i n contac t wit h shallo w subsurfac e wate r i n th e ol d Pin e Canyo n Cree k channe l makes th e Pin e Canyo n Landfil l a potentia l sourc e o f pas t groundwate r impact

. Durin g th e 198 6 reclamatio n th e landfil l wast e tha t wa s in th e Pin e Canyo n drainag e wa s excavate d an d relocate d towar d th e sout h

s o tha t it wa s permanentl y above th e wate r table

. Thi s mitigation
, an d th e vegetate d soil cover tha t wa s place d ove r th e landfil l ca n b e reasonabl y assume d t o have eliminate d o r greatl y reduce d ongoin g releas e o f leachat e fro m th e landfil l waste

. Wahle r (1978 ) estimate d tha t th e loca l recharg e t o th e aquife r i n th e Pin e Canyo n are a wa s approximatel y 12,00 0 acr e fee t pe r year

. Wahle r als o estimate d th e groundwate r flo w velocitie s i n th e are a o f th e mout h o f Pin e Canyo n t o b e 2. 5 t o 5 ft/day

. Thi s flo w rat e woul d b e sufficien t t o hav e allowe d metalli c impact s t o mov e fro m th e vicinit y o f th e Pin e Canyo n Landfil l t o area s dow n gradien t o f th e sit e b y now

. 3.4.1. 4 Elto n Tunne l T h e Elto n Tunne l wa s starte d i n 193 7 an d complete d i n 1941

. Th e tunne l

w a s about 23,00 0 fee t lon g an d wa s drive n t o intercep t th e Ape x Min e undergroun d min e working s fo r min e acces s an d t o drai n wate r fro m th e lowe r working s o f th e ol d Ape x mine

. Anacond a record s sho w tha t th e rang e fron t fault wa s crosse d b y th e tunne l abou t 9,00 0 fee t fro m th e portal

. T h e firs t 8,00 0 fee t o f tunne l wer e reportedl y drive n thoug h unconsolidate d material

. Th e firs t 5,00 0 fee t o f tunne l mad e n o wate r an d th e firs t 9,00 0 fee t

o f tunne l mad e a tota l o f 29 7 gpm

. Afte r crossin g th e rang e fron t fault

, th e tunne l mad e wate r throughou t most o f it s lengt h t o it s end

. Prio r t o connectin g wit h th e Ape x Min e workings

, a t time s th e tunne l mad e over 8 c f s o f water

. Seve n dril l hole s wer e advance d fro m th e tunne l t o th e ol d Ape x Min e i n June

, 1941

. Whe n thes e dril l hole s wer e completed

, the y flowe d 4. 5 cfs

. Th e tota l flo w fro m th e tunne l porta l a t thi s tim e wa s abou t 12. 5 cfs

. Th e wate r flowe d ou t o f th e tunne l b y gravity

. Th e Elto n Tunne l discharge d wate r a t a n averag e rat e o f 5 cf s fro m 194 1 throug h 1950 when part s o f th e tunne l bega n t o cave

. Th e discharg e cease d in abou t 1958 whe n th e tunne l wa s completel y plugge d b y cavin g ground

. T h e wate r discharge d fro m th e Elto n Tunne l wa s used b y th e loca l rancher s f o r irrigation

. According t o Uta h State Enginee r record s (Gates

, 1965 ) th e wate r level s i n th e Erd a area , where th e Elto n Tunne l wate r wa s used fo r irrigation
, showe d a n increas e in averag e wate r level s o f abou t 1 2 fee t fro m abou t 193 9 unti l abou t 1950 after-whic h it declined-t o eve n lowe r tha n wha t it wa s i n 1939

. This correspond s t o th e annua l flo w fro m th e tunne l whic h staye d a t ove r 3,70 0 acre-fee t unti l 1950 afte r whic h it rapidl y decrease d t o les s tha n 1,00 0 acre-fee t in 1953
, an d the n t o les s tha n 10 0 acre-fee t in 1955 wit h al l flo w ending i n 1958

. Anacond a record s note d tha t th e wate r flowin g fro m th e tunne l wa s generall y goo d enoug h fo r irrigatio n purpose s bu t occasiona l pumpin g o f min e wate r Atlanti c Richfield Compan y 1 8' Marc h 12,200 2IS& R / Car r For k Remedia l Investigatio n Site Groundwate r Conceptua l Mode l fro m th e Rood Shaf t working s tha t wer e deepe r tha n th e Elto n Tunne l apparentl y produce d wate r o f poo r qualit y whic h wa s no t suitabl e fo r irrigation

. Durin g thes e period s o f poo r water
, th e Elto n discharg e wa s diverte d fro m th e irrigatio n system s tha t normall y used th e wate r (McArthu r a n d Botz

, 1971)

. Thi s repor t als o state s tha t min e wate r wa s release d int o t h e Elto n Tunne l infrequently

. A partia l wate r analysi s fo r th e Elto n Tunne l flo w o n Jun e 2 0 194 1 (afte r connectin g wit h th e Ape x Mine) showe d a TD S

o f 3,78 0 mg/ l an d sulfat e o f 1,970 mg/ l whereas th e wate r i n April

, 194 1 (befor e connectin g wit h th e Ape x Mine ) showe d a TD S o f 32 9 mg/ l an d sulfat e o f 77. 4 mg/l

. Dat a fo r arsenic
, nitrat e o r othe r analyse s o f Elto n Tunne l wate r discharg e have no t bee n locate d t o date

. I t i s possibl e tha t wate r flowe d fro m :th e ol d min e working s int o th e Elto n Tunne l void fro m 195 8 unti l th e working s wer e de-watere d i n th e earl y 1970' s fo r th e Car r For k min e operations

. Thi s wate r di d no t flo w fro m th e tunne l porta l becaus e o f th e cavin g conditio n bu t it i s possibl e tha t th e tunne l wate r wa s discharge d t o th e subsurfac e in th e portio n o f th e tunne l drive n throug h unconsolidate d materia l tha t wa s apparentl y abov e th e wate r table

. Thi s wate r coul d have recharge d th e alluvia l fa n deposit s nea r th e mout h o f Pin e Canyon

. I n Septembe r 1971

, Anacond a installe d Dril l Hol e No. 4 dow n int o th e Elto n Tunne l t o se e i f ther e wa s wate r i n th e tunnel

. The y di d intercep t wate r in th e tunne l an d a wate r sampl e obtaine d o n 10/5/7 1 showe d arsenic
, cadmium

, an d lea d concentration s belo w detectio n limit s a n d nitrat e a t 0.3 2 mg/l

. This woul d indicat e tha t th e wate r i n th e tunne l betwee n where it i s plugge d an d th e Ape x Min e working s wa s goo d qualit y wate r an d therefor e i s no t likel y t o b e a sourc e fo r groundwate r impact

. Th e locatio n o f thi s dril l hol e ha s no t been determine d a t thi s time
, howeve r t o bette r interpre t th e wate r chemistry dat a researc h wil l continu e t o fin d th e exact location

. T h e mappe d alignmen t o f th e Elto n Tunne l take s i t directl y unde r th e settlin g pond s s o it i s possibl e tha t migratio n o f seepag e fro m thes e pond s wa s influence d b y th e tunne l alignmen t which may have ha d highe r permeabilit y tha n th e surroundin g ground

. I f thi s happened

, latera l migratio n o f th e seepag e fro m th e pond s coul d hav e been preferentiall y directe d alon g th e 

### tunne l towar d it s porta l location

. Durin g th e tunne l excavatio n wast e roc k wa s stockpile d i n th e Pin e Cree k drainag e botto m movin g th e cree k flo w ou t o f it s origina l channe l t o th e northerl y sid e o f th e drainage

. Th e DER R (1996 ) obtaine d on e sampl e fro m t h e wast e roc k a t th e Elto n Tunne l an d th e tota l metal s analyse s ar e show n i n Table 3-11

. Th e assa y result s fo r th e DER R sampl e o f Elto n Tunne l wast e roc k does no t indicat e tha t th e wast e roc k i s a potentia l significan t
sourc e o f groundwate r impact

.

Atlanti c Richfield Compan y 1 9

Marc h 12,200 2IS& R / Car r For k Remedia l Investigatio n Site Groundwate r Conceptua l Mode l Tabl e 3-1 1 Assa y Result s fo r Elto n Tunne l Dum p 

### Paramete r Arseni c Cadmiu m Chromiu m Coppe r Lea d Manganes e Mercur y Zin c 

### Concentratio n

(mg/kg)
56. 5 9 4. 5 23 9 70 0 38 7 0.7 9 1,36 0 Wate r sample s have been take n fro m th e cree k above an d belo w th e min e dump

. Th e ER A contracto r sample d th e cree k belo w th e Elto n Tunne l i n 198 5 (TS-SW-02)

. JB R establishe d a monitorin g locatio n o n th e Pin e Creek belo w th e dum p (SW-10)

. These

, sampl e result s ar e show n i n Table 3-12

. Table 3-1 2 Tota l Metal s Analyse s fo r Pin e Creek belo w Elto n Tunne l Paramete r Arseni c Cadmiu m Chromiu m Coppe r Lea d Zin c TS-SW-0 2

(mg/l )
0.01 2 O.00 5 O.00 5 0.00 9 <0.0 3 0.04 9 SW-1 0 8/8 5 (mg/l )
0.0 1 0.007 <0.00 5 0.01 <0.01 0.05 5 Histori c samplin g dat a show s tha t th e Elto n Tunne l discharg e wate r ha s no t been a likel y sourc e o f metal s o r nitrat e t o th e groundwate r aquifers

. Th e mos t recentl y availabl e dat a collecte d b y Anacond a i n 1971

, a s describe d above

, show s tha t wate r whic h ma y be store d i n th e tunne l i s o f goo d quality

, s o i t furthe r indicate s Elto n Tunne l is no t currentl y impactin g area aquifers

. 3.4.1. 5 Car r For k Tailing s T h e Car r For k tailing s wer e produce d fro m th e Anacond a Car r For k Projec t mil l an d have been shown t o have lo w tota l an d solubl e meta l concentration s 

### a n d a hig h ne t neutralizing capacit y du e t o thei r carbonat e minera l conten t (JBR

, 1986 ) (se e Tabl e 3-13

. an d 3-14)

. Th e Car r For k tailing s wer e Atlanti c Richfield Compan y 2 0 Marc h 12
, 200 2. IS& R / Car r For k Remedia l Investigatio n Site Groundwate r Conceptua l Mode l deposite d i n th e norther n portio n o f th e Car r For k tailing s pon d durin g th e shor t operationa l histor y o f th e Car r For k project

. The y ar e impounde d 

### behin d th e Car r For k tailing s dam

. Table 3-13 Car r For k Tailing Tota l Metal s Cone

, (mg/kg ) Averag e Minimu m Maximu m Arseni c 82. 5 6 0 10 0 Cadmiu m 5 3 8 Coppe r 926 73 5 104 0 Mercur y 0.0 5 0.0 2 0.1 2 Lea d

12 7 2 0 34 5 Table 3-1 4 Car r For k Tailing s E.P

. Toxicit y Cone

, (mg/l ) Averag e Minimu m Maximu m Arseni c <0. 1 <0. 1 <0. 1 Cadmiu m <0. 1 <0. 1 <0. 1 Chromiu m 0.0 2 0.01 0.0 3 Mercur y <0.000 1 <0.000 1 <0.000 1 Lea d

<0.0 5 <0.0 5 <0.0 5 T h e tailing s solid s analyse s indicat e tha t th e Car r For k tailing s contai n arsenic
, cadmium

, copper
, mercur y an d lea d bu t th e averag e concentration s a r e no t high

. Th e leachabl e metal s conten t is low

. This woul d indicat e th e Car r For k tailing s solid s d o no t represen t a significan t sourc e o f metal s impac t fo r th e groundwater

. A sampl e o f Car r For k tailing s (TS-T-02 ) take n b y th e ER A (1985 ) showe d tota l metal s assays fo r arsenic (12 4 mg/kg ) an d lea d (17 3 mg/kg)

. Anacond a record s showe d tha t durin g millin g operation s th e tailing s wate r containe d i n th e Car r For k tailing s slurr y ha d th e followin g chemistry : sulfate 

### (65 0 mg/l)

, TD S (1,16 0 mg/l)

, arsenic "(0.00 1 mg/l)

, lea d (0.0 5 mg/l)

, cadmiu m (0.0 1 mg/l ) an d zin c (0.0 2 mg/l)

. Thes e concentration s ar e lo w a n d indicat e tha t th e origina l tailing s wate r deposite d wit h th e Car r For k tailing s di d no t represen t a significan t sourc e o f impac t fo r th e groundwater

. T h e DER R (1996 ) installe d a lysimete r (AC-LY-03 ) i n th e Car r For k tailing s a n d obtaine d a wate r sampl e tha t represent s near surfac e wate r containe d i n th e uhsaturate d Car r For k tailing s a t tha t time

. Non e o f th e wate r qualit y parameter s fro m thi s sampl e exceede d MCLs

. Wahle r (1978 ) estimate d tha t th e dept h t o th e wate r tabl e i n th e are a is abou t 40 0 t o 60 0 feet

. The y measure d th e porosity
, specifi c yield

, fiel d capacity
, moistur e content
, an d moistur e deficienc y i n th e deposit s underlyin g th e Car r For k tailing s pond

. The y conclude d tha t seepag e fro m Atlanti c Richfield Compan y 21 Marc h 12
, 200 2IS& R / Car r For k Remedia l Investigatio n Site Groundwate r Conceptua l Mode l t h e Car r For k tailing s pon d woul d tak e approximatel y 24 0 years t o reac h th e wate r tabl e throug h vertica l flo w i n th e unsaturate d zone

. J B R (1986 ) used dat a an d calculation s develope d by Wahle r (1978 ) t o estimat e th e groundwate r impac t attributabl e t o th e Car r For k tailings

. Thes e calculation s showe d .tha t th e concentration s o f metal s i n th e groundwate r unde r th e tailing s pon d wer e no t expecte d t o excee d an y groundwate r protectio n standards

. This appear s t o b e verifie d b y th e tailing s pon d monitorin g wel l (GW-4 ) locate d immediatel y wes t o f th e Car r For k tailing s dam

. Th e monitorin g dat a presente d by JB R (1986 ) showe d tha t sample s fro m thi s wel l take n i n 198 5 di d no t indicat e an y impac t o f th e groundwate r above MCLs

. T h e Car r For k tailing s wer e completel y covered wit h topsoi l an d vegetate d

a s par t o f th e 198 6 reclamation

. Thi s vegetatio n cover greatl y reduce s th e n e t infiltratio n o f meteori c wate r int o th e tailing s b y evapotranspiration

. Eliminatin g most o f th e infiltratio n an d th e dept h t o groundwate r unde r th e sit e i n al l likelihoo d preclude s any contributio n o f ongoin g leachat e fro m th e tailing s solid s int o th e groundwater

. Based o n th e above characterizatio n o f th e Car r For k tailings

, the y d o no t appea r t o presen t a significan t sourc e o f past
, presen t o r potentia l futur e impac t t o th e groundwate r qualit y a t th e site

. 3.4.1. 6 IS&R Tailing s T h e IS& R tailing s wer e produce d fro m th e histori c IS& R concentrato r operation s befor e th e Anacond a Car r For k min e operation s an d ar e presen t beneat h th e Car r For k tailing s an d t o th e sout h an d east o f th e Car r For k tailings

. Analyse s o f th e IS& R tailing s showe d the m t o have relativel y highe r tota l an d solubl e meta l concentration s tha n th e Car r For k tailing s an d generall y have a ne t aci d generatin g potentia l (JBR

, 1986 ) (Tabl e 3-1 5 an d Table 3-16)

. Table

3-15 IS& R Tailing s Tota l Metal s Cone

, (mg/kg ) Averag e Minimu m Maximu m Arseni c 208 2 7 5 1043 0 

### Cadmiu m 21 3 8 5 Coppe r 63 9 10 5 264 0

. Mercury 0.9 9 0.2 2 6. 7 Lea d

845 3 11 0 3310 0

Atlanti c Richfield Compan y 2 2 Marc h 12,200 2IS& R / Car r For k Remedia l Investigatio n Sit e Groundwate r Conceptua l Mode l Table 3-1 6 IS&R Tailing s E.P

. Toxicit y Cone

, (mg/l ) Averag e Minimu m Maximu m Arseni c 0.8 6 0. 1 8. 4 Cadmiu m 0. 1 0.0 2 0.2 3 Chromiu m 0.01 6 0.01 0.6 3 Mercur y 0.000 3 0.000 1 0.01 Lea d
0.7 2 0.5 0 2. 2
A sampl e o f IS& R tailing s (TS-T-03 ) take n b y th e ER A (1985 ) showe d tota l metal s assay s fo r arseni c (1,32 0 mg/kg ) an d lea d (3,76 0 mg/kg)

. A sampl e o f tailing s (AC-SC-02)

, probabl y IS& R tailings

, take n by th e DER R (1996 ) showe d tota l metal s assay s fo r arsenic (64 6 mg/kg ) an d lea d (5,15 0 mg/kg)

. N o wate r qualit y informatio n ha s been foun d t o dat e fo r th e IS& R tailing s slurr y when it wa s deposited

. Th e DER R (1996 ) installe d a lysimete r (AC

- LY-04 ) i n th e IS& R tailing s deposit

. A wate r sampl e obtaine d fro m th e tailin g solid s wa s analyze d an d foun d t o compl y wit h al l MCL s excep t nicke l wher e t h e sampl e concentratio n o f 0.15 1 exceede d th e nicke l MC L (0. 1 mg/l)

. T h e greate r age , relativel y hig h metal s content
, an d th e ne t acid generatin g capacit y o f th e IS& R tailing s compare d t o th e Car r For k tailing s mak e the m a mor e likel y potentia l sourc e o f groun d wate r impac t tha n th e Car r For k tailings

. However

, monitorin g o f th e groundwate r a t Sager s wel l (GW-2 ) an d t h e Car r For k tailing s da m wel l (GW-4 ) dow n gradien t o f th e IS& R tailing s have no t produce d minimu m result s exceedin g MCL s (Se e Table 3-3)

. Th e investigation s o f th e Sit e fo r th e desig n o f th e Car r For k tailing s da m (Bechtel

, 1977 ) include d a numbe r o f boring s an d tes t pit s installe d i n IS& R tailing s an d thes e showe d tha t th e IS& R tailing s wer e no t saturated

, whic h greatl y reduce s thei r potentia l fo r releasin g seepage

. Durin g th e 198 6 reclamatio n th e IS& R tailing s wer e completel y covered wit h topsoi l an d revegetated

. This vegetatio n cover an d th e correspondin g evapotranspiratio n greatl y reduce s th e ne t infiltratio n o f meteori c wate r int o t h e tailings

. Th e lac k o f infiltratio n an d th e dept h t o groundwate r unde r th e sit e likel y preclude s an y contributio n o f ongoin g leachat e fro m th e IS& R tailing s solid s int o th e groundwater

. Based o n th e above characterizatio n o f th e IS& R tailings

, the y d o no t appea r t o presen t a significan t source o f past
, presen t o r potentia l futur e impac t t o groundwate r qualit y a t th e site

. 3.4.1. 7 Wast e Isolatio n Cel l : T h e Wast e Isolatio n Cel l wa s constructe d during th e 198 6 reclamatio n o f th e
Atlanti c Richfield Compan y 2 3 Marc h 12,200 2IS& R / Car r For k Remedia l Investigatio n Sit e Groundwate r Conceptua l Mode l IS& R sit e an d contain s smelte r soli d waste s tha t ha d hig h tota l an d solubl e metal s concentration s an d ne t aci d generatin g potential s whic h wer e relocate d during cleanu p o f th e smelte r sit e (JBR

, 1986)

. Th e cel l wa s purposel y constructe d ove r th e thickes t par t o f th e moder n Car r For k tailing s whic h wer e shown t o b e unsaturate d i n 198 6 befor e th e cel l wa s constructed

. Th e lo w permeabilit y an d hig h capacit y o f th e Car r For k tailing s wer e expecte d t o retar d an d neutraliz e an y aci d leachat e produce d fro m th e waste s containe d i n th e cell

. Th e DER R an d ER A have expresse d concer n over th e potentia l fo r th e wast e cel l t o b e contributing sourc e o f impac t t o groundwater

. T h e availabl e fiel d dat a fo r th e wast e cel l sit e indicate s tha t th e underlyin g tailing s have th e neutralizing capacit y t o neutraliz e an d stabiliz e any acid leachat e tha t migh t migrat e fro m th e cell

. Th e constructio n o f th e cel l botto m

. an d slopin g cover mad e u p o f lo w permeabilit y materia l an d a vegetate d surfac e ca p ar e designe d s o tha t ne t recharg e o f meteori c wate r o r seepag e fro m adjacen t tailing s int o th e cel l is eliminate d o r ver y minor

. Th e lac k o f seepag e fro m th e cell

, it s recen t age , an d th e dept h t o groundwate r indicat e tha t an y seepag e fro m th e cel l i s no t likel y t o have entere d th e groundwater

. T h e wast e isolatio n cel l is no t likel y a sourc e o f existing groundwate r impac t

a n d is no t likel y a potentia l futur e impac t source

. Th e fiel d investigation s alread y propose d a s par t o f th e Remedia l Investigatio n t o investigat e th e wate r conten t an d chemistr y o f th e material s in an d unde r th e wast e cel l shoul d b e sufficien t t o confir m thi s assumption

. 3.4.1. 8 Summar y I n genera l th e samplin g a t an d near th e sit e ha s no t show n impact s t o groundwate r relate d t o facilit y operations
, eithe r metalliferou s o r nitrate

. Th e o n e possibl e exceptio n i s elevate d arsenic in th e Boy s Ranch wells

. Available informatio n doe s no t indicat e a obviou s sourc e o f arseni c 

### originating o n th e site

. Based o n th e foregoin g description

, Table 3-1 7 contain s a prioritize d
summary o f potentia l sources fo r th e groundwate r impac t issue s relate d t o wate r qualit y immediatel y dow n gradien t o f th e site

. Sectio n 4 propose s specifi c action s t o confir m ther e i s no t a genera l groundwate r concer n a t o r dow n gradien t o f th e sit e an d furthermor e whethe r ther e i s a connectio n betwee n th e sit e an d th e arsenic concer n in th e Boy s Ranc h wells

. 3.4. 2 Erd a Are a T h e USG S ha s monitore d well s i n Erd a fo r severa l year s an d a t certai n location s produce d sample s wit h hig h concentration s o f nitrate+nitrit e expresse d a s nitrogen

. A s state d previously

, a t time s during th e de-waterin g o f th e mine s associate d wit h t h e IS&R/Car r For k facilities

, th e excess wate r wa s used fo r irrigatio n purpose s i n Erda

. Som e have theorize d tha t th e concentratio n leve l o f nitroge n foun d i n th e 

### Erd a well s may have a n origi n a t th e IS&R/Car r For k facility

.
Atlanti c Richfield Compan y 2 4

Marc h 12,200 2

### Table 3-1 7 Potentia l Groundwate r Impac t Source s 

### I n IS&R/Car r For k Are a Sourc e Prioritize d a s t o Likelihoo d

o f Potentia l Impac t o n Boy s Ranch Wells 

### Sla g Pin e Canyo n 

### Elto n Tunne l Settling Hx^ j 

### IS&R^S * Car r For k Tailing s 

### Wast e Cel l 1 

### Tota l Metal s 

### Conten t Hig h Hig h Low 

### Lo w Hig h Low 

### Hig h Acid/Bas e Potentia l

Aci d Aci d Aci d (3 ) 

### Alkalin e Aci d Alkalin e Aci d Solubl e Metal s Conten t Hig h (2) Hig h L o w (4 ) 

### Hig h (6 ) Hig h Low 

### Hig h Arseni c Conten t

Low Hig h Low Low 

### Moderat e Low Hig h Nitrat e Conten t Negligibl e Negligibl e L o w (5 ) Low Low Low 

### Negligibl e 

### Know n

Contac t 

### w/Groundwate r i n the Past ? Y e s Y e s Likel y Likel y N o t Likel y N o t Likel y N o Ongoin

g Sourc e o f Groundwate r Impact ? (1 )
Possibl e Possibl e N o t Likel y 

### N o t Likel y N o t Likel y 

### N o t Likel y N o t Likel y Proximit y t o 

### Boy' s Ranc h Well s (ft )

5,60 0 5,50 0 2,00 0 3,60 0 2,50 0 2,90 0 3,80 0

1 ) Thi s relativ e quantitativ e ratin g is base d o n th e curren t conditio n o f th e potentia l sources , including sourc e potentia l (constituen t concentrations
, relativ e solubility ) an d pathwa y potentia l (connectio n t o groundwater)

. 2 ) Thoug h tota l metal s concentration s i n sla g ar e relativel y high

, arsenic an d nitrat e concentration s ar e low

. 3 ) p H o f th e tunnel'discharg e was reporte d t o generall y be betwee n 5 an d 7 wit h occasiona l lowe r values

. 4 ) N o historica l data

, bu t wate r qualit y in th e tunne l in 197 1 ha d lo w concentration s o f metals

. 5 ) N o histori c quantitativ e data

, bu t wate r qualit y i n th e tunne l i n 197 1 ha d lo w nitrate

. 6 ) Onl y a concer n fo r lea d an d cadmiu mIS& R / Car r For k Remedia l Investigatio n Site Groundwate r Conceptua l Mode l 

### Nitroge n occur s i n several form s i n groundwate r including : ammonium
, ammonia
, nitrite
, nitrate
, nitroge n gas , nitrou s oxide

, an d organi c nitrogen

. Groundwate r commonl y acquire s nitrat e fro m severa l sources including : precipitation
, decompositio n o f plan t residu e i n soil

, minera l fertilizer

, an d sewage

. Becaus e nitrat e is ver y solubl e i n oxidizing condition s (i.e

. shallo w unconfine d groundwater)

, it move s in th e wate r wit h littl e retardatio n an d i s no t readil y transforme d t o les s mobil e species

. Whe n groundwate r system s becom e confine d an d th e availabl e oxyge n i s consumed

, nitrat e i s reduce d t o th e non-harmfu l for m o f nitrou s oxide

.

. Th e USG S ha s complete d conceptua l groundwate r mode l of^th e potentia l fate an d transpor t o f sit e impac t sources bein g transporte d t o th e Erd a area in th e groundwater

. Particl e trackin g analysi s wa s performe d wit h MODPAT H softwar e i n conjunctio n wit h th e existing
, steady-stat e numerica l groundwate r modul e alread y develope d fo r th e Tooel e Valle y (Lamber t an d Stolp

, 1999)

. Base d o n thi s modeling

, the y conclude d tha t groundwate r movemen t fro m th e Sit e is no t a likel y sourc e o f nitrat e contaminatio n i n th e Erd a area

. The y lef t ope n th e hypothesi s tha t t h e Erd a contaminatio n coul d hav e occurre d fro m surfac e transpor t o f th e nitrat e i n irrigatio n wate r originating fro m th e Site

. However

, surfac e wate r monitorin g result s as discusse d above indicat e tha t ther e has no t been a significan t sourc e o f nitrat e emanatin g fro m th e IS&R/Car r For k operation

. Ther e ar e severa l indicator s i n th e Erd a are a tha t th e nitrat e level s foun d i n th e loca l well s ar e muc h mor e likel y t o b e fro m loca l sources

. Initia l researc h ha s foun d tha t the Erd a are a ha s historicall y bee n and continue s t o b e an agricultur e are a where nitroge n base d amendment s have been adde d t o th e soil s fo r man y years

. I n additio n th e are a formall y ha d man y chicke n farm s which loca l resident s clai m wer e heavil y lade n wit h chicke n organi c waste

. Hig h chlorid e level s isolate d t o th e Erd a are a als o coul d sugges t a n organi c source

. Th e onl y know n organi c sourc e a t th e smelte r sit e ar e septi c tanks

, however

, thi s sourc e woul d no t onl y b e small

, th e USG S mode l ha s show n tha t subsurfac e migratio n is no t a likel y sourc e o f impac t t o groundwate r in Erda

. 4 . 0 DAT A GAPS AN D STUD Y PROPOSE D

4 . 1 Existing Well s an d Monitorin g Dat a T h e followin g existin g well s wil l b e sample d during R l fiel d samplin g activities
, (se e Figur e 4.1 ) AE-GW-1B : (JB R GW-1

, 16 " Boy s Ranc h Well ) Thi s is a 16-inch diameter

, 66 0 foo t dee p wel l reporte d t o be a forme r Boy s Ranc h well

. Ther e ar e tw o well s i n th e same vicinity
, on e o n wes t sid e o f th e curren t fenc e an d on e o n th e east side

. Sinc e th e tw o well s ar e i n clos e proximit y o f eac h othe r an d recent samplin g confirm s tha t th e well s produc e simila r result s Atlanti c Richfield propose s t o onl y sampl e th e 16 " Boy s Ranch Well

. Vide o o f th e tw o well s als o show s tha t th e 16 " wel l i s i n muc h bette r conditio n an d i s perforate d whereas th e 6 " wel l is no t an d ha s significan t crystallizatio n fro m stagnate d water

. Th e Boy s Ranch well s a r e onl y used fo r monitoring an d n o wate r righ t i s currentl y attache d t o it

. Th e stati c wate r leve l during th e firs t quarte r samplin g wa s sounde d a t 59 1 fee t belo w groun d surface

.
Atlanti c Richfield Compan y 2 6

Marc h 12,200 2

# Colo r Chart(s)

T h e followin g page s contai n colo r tha t doe s
n o t appea r i n th e scanne d 

# images

. T o vie w th e actua l images
, pleas e contac t th e 

# Superfun d Record s Cente r
a t (303 ) 312-6473

.

### LEGEN D
New / Restored Wel l Existin g Wel l G IWUSGSR1420 1

ANDERSON

EXISTIN G & PROPOSE D GROUNDWATE R MONITORIN G WELL SIS& R / Car r For k Remedia l Investigatio n Site Groundwate r Conceptua l Mode l A E

- GW-2 : (JB R GW-2

, Sager s Well ) Thi s is a n 8-inc h diameter

, 650-foo t dee p wel l referre d t o i n pas t samplin g event s a s th e Bruce Sager s well

, however

, th e wate r righ t fo r thi s wel l 

### belong s t o Rodne y Mecham

. Th e wel l i s reportedl y used fo r domesti c purposes

. Th e stati c wate r leve l during th e firs t quarte r samplin g wa s sounde d a t 54 0 fee t belo w groun d surface

. AE-GW-3A: This wel l is als o locate d o n Atlanti c Richfield property
, i n th e extrem e northwes t

corner , detail s abou t th e wel l ar e unknown

. Th e USG S ha s indicate d tha t the y have no t sample d it in th e past
, an d n o wate r righ t i s attache d t o it

. Th e wel l has a collapse d casin g a t approximatel y 210ft

. belo w th e surface

. Ther e wa s n o evidenc e o f wate r a t 210ft

. This wel l wil l b e restore d t o 75 0 ft

. an d cased fo r th e purpose
, o f futur e monitoring

. AE-GW-4 : (JB R GW-4

, Car r For k Tailing s Da m Well ) Thi s wel l wa s installe d jus t wes t o f th e tailing s impoundmen t dike

, reportedl y b y th e USGS

. thi s is a 6 " diamete r well

, 65 4 f t deep

. Wel l vide o o f thi s wel l shows evidenc e o f abandonmen t an d n o wate r a t a dept h o f approximatel y 65 0 ft

. belo w th e surface

. Thi s wel l wil l b e restore d o r replace d t o a dept h

o f 75 0 f t an d cased fo r th e purpos e o f futur e monitoring

.

. AE-GW-6 : Thi s wel l i s upgradien t fro m th e site
, o n Kennecot t property

. Th e wel l i s a n 8

- inc h diamete r wel l tha t i s 20 0 ft

. deep

. Th e stati c wate r leve l in Decembe r 200 1 wa s 10 3 fee t belo w groun d surface

. GW-USGS : Thi s USG S wel l is locate d wes t o f th e tow n o f Lincoln

. Thi s is a 4-inc h diamete r wel l which i s 54 3 fee t deep

. Th e stati c wate r leve l i n Decembe r 200 1 was sounde d a t 42 0 fee t belo w groun d surface

. T o bette r understan d th e conditio n o f th e wells

, AE-GW- 1 A

, AE-GW- 1 B

, AE-GW-3 a an d AE

- GW- 4 wer e videoed

. Result s o f th e videoin g have been take n int o consideratio n in developin g thi s samplin g plan

. A copy o f th e vide o log s ha s been submitte d t o EP A unde r separat e cover

. Th e existing well s discusse d above (excep t th e 6 " Boy s Ranch Well ) wil l b e analyze d quarterl y fo r th e parameter s liste d i n Table 6- 1 o f th e SAP

. I n additio n t o th e existing wells

, th e installatio n o f a limite d numbe r o f ne w monitorin g well s wil l b e drille d a s describe d below

. Additiona l researc h wil l identif y th e apparen t discrepancie s i n existin g dat a an d wil l b e clarifie d befor e th e histori c dat a ar e utilize d t o identif y long-ter m wate r qualityitrend s near t h e Site

. I n addition

, th e histori c dat a wil l b e checke d fo r inferio r qualit y compare d t o curren t expectation s an d reviewe d fo r qualit y wit h basic Q A checks suc h a s cation/anio n balance s befor e i t is used i n th e RI/FS

. Atlanti c Richfield wil l als o continu e t o researc h publi c an d privat e record s fo r histori c dat a o n th e Anacond a groundwate r monitorin g effort s a t th e Sit e befor e an d afte r de-waterin g a n d millin g operation s bega n fo r th e Car r For k mine

. I n additio n Anacond a ma y have collecte d dat a fro m additiona l well s a t sit e an d a t well s near Erda

. Dat a fro m thes e location s ma y have been collecte d a s earl y a s 197 1 and 1972

. : Finally

, al l availabl e dat a relate d t o th e qualit y o f th e de-waterin g wate r fro m th e Pin e Canyo n Tunne l an d th e settlin g pond s wil l b e gathere d an d reviewe d t o determin e th e 

### qualit y o f th e wate r tha t wa s route d throug h th e settlin g pond s an d applie d t o th e irrigatio n field s betwee n th e Sit e an d Erda

. Atlanti c Richfield Compan y 2 7

Marc h 12,200 2IS& R / Car r For k Remedia l Investigatio n Sit e Groundwate r Conceptua l Mode l
4 . 2 Pin e Canyo n Drainag e T h e wate r tabl e unde r th e Pin e Canyo n Creek drainag e botto m may b e more shallo w tha n th e regiona l wate r dept h o f 40 0 t o 60 0 fee t as indicate d b y dept h t o wate r a t AE-GW- 6 an d t h e abundan t riparia n vegetatio n growin g withi n th e drainage

. Th e drainag e basi n consist s
o f a n alluvia l was h materia l whic h is bein g recharge d fro m surficia l flow s fro m Pin e Cree k whic h ma y creat e a groundwate r moun d whic h has a steepe r hydrauli c gradien t as it flow s towar d th e valle y unti l i t eventuall y intersect s th e regiona l aquifer

. Th e Boy s Ranch wells

, which have historica l evidenc e o f metalli c level s above MCLs

, ar e locate d withi n th e drainage

. Thoug h n o obviou s connectio n exist s betwee n th e arseni c concentration s i n th e Boy s Ranc h well s an d sit e sources , on e additiona l wel l betwee n th e sit e an d th e Boy s Ranch wel l coul d provid e valuabl e informatio n i n determining i f th e aquife r contain s elevate d constituents

. I f i t doe s not
, ther e is a stron g likelihoo d tha t th e elevate d arsenic foun d dow n gradien t is no t connecte d wit h th e site

. This wel l wil l allo w fo r th e obtaining o f wate r tabl e elevatio n an d wate r chemistr y dat a fo r th e uppermos t aquife r dow n gradien t o f th e sla g pile a n d landfill

. Thi s ne w dat a wil l assis t i n determining i f th e sla g o r landfil l have impact s t o t h e uppermos t aquife r immediatel y dow n gradien t o f th e facilities

. T h e Kennecot t wel l (AE-GW-6 ) wil l b e sample d a s a n u p gradien t wel l t o th e slag an d othe r sit e features

. Thi s wel l wil l provid e th e u p gradien t groundwate r elevatio n an d wate r chemistry

. 4 . 3 Erd a Nitrat e T h e nitrat e concentrations
, observed b y th e DER R (1996 ) in lysimete r sample s o n site
, ar e withi n th e rang e o f naturall y occurrin g soi l nitrat e an d d o no t indicat e a ma n mad e sourc e o f nitrat e impac t significan t enoug h t o effec t th e Erd a area

. Literatur e wil l b e searche d t o provid e additiona l informatio n definin g thi s condition

. Literatur e wil l als o b e searche d fo r informatio n relate d t o th e nitroge n isotopi c signatur e o f groundwate r nitrat e originating fro m us e o f minin g explosives

. Th e nitroge n isotopi c characte r o f groundwate r nitrat e originating fro m chemica l explosive s i s likel y differen t tha n domesti c an d agricultura l sources o f nitrate

. T o addres s th e hypothesi s tha t th e Erd a nitrat e level s ar e du e t o transpor t o f hig h nitrat e concentration s i n irrigatio n wate r originatin g fro m th e Car r For k site
, a thoroug h review wil l b e conducte d o f Anacond a monitorin g record s t o obtai n al l availabl e wate r qualit y dat a fo r t h e min e de-waterin g system

. Th e nitrat e concentration s indicate d i n thes e dat a wil l b e compare d t o th e concentration s in th e Erd a area

. A s describe d above nitrat e concentration s in th e de-waterin g wate r researche d t o dat e i s no t hig h enoug h t o have resulte d in th e observe d elevate d level s a t Erda

. T h e Anacond a record s wil l b e searche d fo r informatio n o n where th e irrigatio n wate r originating a t th e Car r For k sit e wa s applied

. Thi s coul d b e used i n conjunctio n wit h th e existing USG S modelin g t o se e i f i t woul d b e possibl e fo r th e nitrat e fro m thes e irrigate d

area s t o b e transporte d t o th e well s in Erd a sinc e th e tim e thi s irrigatio n occurred

. Nitroge n an d oxyge n isotope s ca n provid e a powerfu l too l fo r identifyin g sources o f nitroge n i n groundwater

. Th e isotopi c composition s (i.e

. th e rati o o f heav y t o ligh t isotopes) o f
Atlanti c Richfield Compan y 2 8 Marc h 12
, 200 2IS& R / Car r For k Remedia l Investigatio n Site Groundwate r Conceptua l Mode l nitroge n an d oxyge n in nitroge n specie s ar e dependen t o n th e origina l sourc e o f th e nitrogen

. Fertilizer

, soi l organi c matter
, manure , septi c syste m leachate

, industria l chemicals

, an d nitroge n compound s derive d fro m us e o f explosive s eac h have thei r ow n distinctiv e isotopi c composition

. Isotopi c composition s ar e determine d b y measurin g th e rati o o f heav y t o ligh t isotope s in a wate r sampl e relate d t o a standard

. I n addition

, th e hig h nitrat e conten t i n th e Erd a well s ar e accompanie d b y chloride s above t h e secondary drinkin g wate r standards

. Thi s conditio n occur s i n a vast numbe r o f well s sample d i n Erda

. Hig h nitrat e togethe r wit h hig h chlorid e level s is a mor e positiv e indicatio n o f sewag e seepag e o r barnyar d pollutio n tha n nitrat e alon e (Driscoll,1987)

. Atlanti c Richfield propose s obtaining sample s o f wate r fro m ke y location s i n th e Car r For k

a n d th e Erd a are a an d analyzing the m fo r Nitroge n 1 5 an d Oxyge n 1 8 isotope s t o provid e 

### thei r isotopi c characterization

. Thes e dat a woul d the n b e compare d agains t th e standard s identifie d i n th e literatur e an d agains t eac h othe r fo r interpretation

. Atlanti c Richfiel d wil l als o sampl e thes e same sources fo r stabl e wate r isotope s (Oxyge n 1 8 an d Hydroge n 2 ) which wil l allo w discriminatio n o f th e differen t waters themselves

. Atlanti c Richfield propose s tha t isotopi c sample s b e obtaine d fro m impacte d an d non

impacte d well s i n Erda

, monitorin g well s a t th e Site

, an d wate r obtaine d fro m KUCC' s
curren t pumpin g o f th e Car r For k min e working s t o compar e isotopi c signature s o f th e variou s wate r sources

. 5 . 0 DECISIO N

RUL E AN D SCHEDULIN G INFORMATIO N

5 . 1 Develo p a Decisio n Rul e This portio n o f th e investigatio n is broke n dow n int o tw o distinc t area s fo r samplin g an d dat a evaluation

. Th e vicinit y o f th e site
, specificall y lowe r Pin e Canyon/Lincoln area an d th e Erd a areas

. Th e determinatio n o f whethe r a n are a i s considere d impacte d wil l be mad e b y compariso n o f th e finalize d historica l dat a wit h newl y collecte d dat a an d th e Primar y Drinking Wate r Standards(MCL)

.

Furthe r determination s ca n b e mad e b y performing exposur e an d risk calculation s i n accordanc e wit h standar d approache s an d method s acceptabl e t o th e USEPA

. Th e secon d componen t o f thi s determinatio n wil l b e confirmatio n o f th e source o r sources

. A s th e stud y progresses
, Atlanti c Richfiel d wil l continu e t o wor k wit h th e EP A t o insur e tha t th e method s an d samplin g provid e th e neede d dat a t o full y generat e accurat e sit e specifi c informatio n fo r th e groundwate r investigations /

5 . 2 Specif y Limit s o n Decisio n Errors Collectio n o f th e ne w an d supplementar y groundwate r dat a i n thi s proposa l wil l b e i n accordanc e wit h th e IS&R/Car r For k Remedia l Investigatio n Samplin g an d Analysi s Plan

. T h e Dat a Qualit y Assuranc e Pla n , which is a par t o f th e SAP

, wil l b e complie d wit h fo r sampl e collection

, handling

, analytica l procedures

, dat a reduction

, validatio n an d reporting

. Atlanti c Richfield ha s prepare d th e SA P i n cooperatio n wit h th e EPA

, Regio n 8 t o provid e sufficien t sampl e result s t o resul t i n consisten t an d applicable estimate s o f th e mean fo r calculatin g UCL's

.

Atlanti c Richfield Compan y 2 9

Marc h 12,200 2IS& R / Car r For k Remedia l Investigatio n Sit e Groundwate r Conceptua l Mode l
5 . 3 Optimiz e Desig n Thi s Sit e Groundwate r Conceptua l Mode l ha s been develope d t o addres s specificall y th e dat a gap s relate d t o groundwate r qualit y concerns i n th e vicinit y o f th e Sit e an d a t Erda

. A s th e wor k progresse s wit h installatio n o f ne w wells

, sampling

, dat a collection

, research

a n d clarificatio n o f dat a discrepancie s th e mode l wil l b e re-evaluate d t o insur e tha t th e collecte d dat a wil l provid e th e informatio n essentia l t o solvin g healt h an d environmenta l

concerns associate d wit h th e forme r IS&R/Car r For k facility

. 5 . 4 Schedule Upo n approva l o f thi s Site Groundwate r Conceptua l Mode l an d propose d dat a collectio n action s wel l drillin g activitie s wil l begin

. Researc h an d evaluatio n o f ol d proces s an d operationa l activitie s wil l b e initiate d upo n th e same approval

. Also

, clarificatio n o f dat a descripencie s andfinalizatio n o f th e comprehensiv e Sit e databas e wil l b e complete d during t h e drilling an d samplin g period

. I t i s Atlanti c Richfield' s intentio n t o attemp t t o install th e propose d well s t o mee t th e nex t quarte r samplin g event period

. 6 . 0 REFERENCE S Anderso n Engineerin g Co.

, Inc.

, 1986

. As-built Drawings

- IS& R Site. Bechte l Corporation

. 1977

. Desig n Repor t Tailin g Embankment : repor t prepare d fo r th e Anacond a Company

, Car r For k Project

, Utah

. Divisio n o f Environmenta l Respons e an d Remediation

. 1996

. Analytica l Result s Report

, Anacond a Coppe r - Car r Fork

, Tooel e County

, Uta h UTD093120921 : Uta h Dept

. o f Environmenta l Quality

. Driscoll

, FletcherG

. 1995

. Groundwate r an d Wells

, Groundwate r Chemistry

, U.S

. Filter/Johnso n 

### Screen

. Environmenta l Protectio n Agency

. 1985

. Analytica l Result s fo r Tooel e Smelter

, Tooele

, Uta h T DD R8-8508-09

. , Fenneman

, N.M.,1931

, Physiograph y o f th e Wester n Unite d States

, Ne w York

, McGraw-Hill Gates,J

. S.

, 1963
, Hydrolog y o f Middl e Canyon

, Oquirrh Mountains

, Tooel e County

, Utah

, USG S Wate r Suppl y Pape r 1619K

. Gates

, J

. S

. 1965

. Reevaluatio n o f th e Groun d Wate r Resources o f Tooel e Valley

, Utah : U.S

. Geologica l Surve y an d Uta h State Engineer/Technica l

Publicatio n No

. 12

. ••••-•• •

t Hebdon

, J

. 1984
, Sit e Inspectio n o f th e Tool e Smelte r an d Anaconda

- Car r For k Operation

, Toole

, UT

, Submitte d t o EPA

, Reg.8

, Uta h Stat e Divisio n O f Environmenta l Health

, Burea u o f Soli d

a n d Hazardou s Waste

. J B R Consultant s Group

. 1986

. Reclamation/Stabilizatio n

Plan

, Anacond a Minera l Company

, Car r For k an d IS& R Tooel e Smelter

, Tooel e Valley

, Utah : repor t prepare d fo r th e Anacond a Atlanti c Richfiel d Compan y 3 0

Marc h 12,200 2IS& R / Car r For k Remedia l Investigatio n Site Groundwate r Conceptua l Mode l Mineral s Company

. J B R Consultant s Group

. 1990

. Car r For k Reclamatio n Project

, Wate r Quality

, Waterfall Erosion

, Revegetation

, Phot o Plots : repor t prepare d fo r Anacond a Mineral s Company

. Lambert

, P.M.

, an d Stolp

, B.J

. 1999

. Hydrolog y an d Simulatio n o f th e Groundwate r Flo w Syste m i n Tooel e Valley

, Utah : U.S

. Geologica l Survey

, Wate r Resource s Investigatio n Repor t 99-4014

. McArthur

, G.M.

, an d Botz

, M.K.

, 1971

, Dewaterin g th e Car r For k Min e an d Disposing o f Wate r int o t h e Tooel e Valley : repor t prepare d fo r th e Anacond a Company

. Razem

, A.C.

, an d Steiger

, J.I

. 1981

. Groun d Wate r Condition s i n Tooel e Valley

, Uta h 1976-78 : U.S

. Geologica l Surve y an d Uta h State Engineer

, Technica l Publicatio n No.69

. Ryan

, K

. H.

, B

. W

. Nance

, an d A.C

. Razem

, 1981
, Tes t Drillin g fo r fres h Wate r i n th e Tooel e Valley

, Uta h 1976-78

, State o f Utah

, Divisio n o f Natura l Resources

, Technica l Publicatio n No

. 69

. Sadik-Macdonald

, Hele n L

, 1997

, Anacond a Coppe r - Car r Fork

, Uta h State Departmen t o f Environmenta l Quality

. Steiger

, J.I.

, an d Lowe

, M

. 1997

. Recharg e an d Discharg e Area s an d Qualit y o f Groundwate r i n Tooel e Valley

, Tooel e County

, Utah : U.S

. Geologica l Survey

, Wate r Resource s Investigatio n Repor t 97-4005

. Stolp

, B.J.

, 1994
, Hydrolog y an d Potentia l o f Groundwate r Developmen t i n Southeaster n Tooel e Valle y an d Adjacen t Area s i n th e Oquirrh Mountains

, Tooel e County

, Utah

, State o f Uta h Dept

. o f Natura l Resources

, Technica l Publicatio n No

. 107

. Thomas

, H

. E.

, 1946

. Groundwate r i n Tooel e Valley

, Tooel e County

, Utah

, Uta h State Engineer

, Technica l Repor t No

. 4
, Uta h Stat e Engineerin g 2 5 Bienn

. Rept

. Tooel e Count y Historica l Societ y 1986

. Minin g Smeltin g an d Railroadin g i n Tooel e County

. Claud e F

. Atkin

. USDA

, 1998
, Soi l Surve y o f Tooel e Area

, Uta h Wahler

, W

. A

. an d Associates

, 1977

, Groundwate r Studies : Min e Wate r Managemen t Plan

, Prepare d fo r th e Anacond a Company

. . Wahle r an d Associates

. 1978

. Tailing s Pon d Managemen t Plan

, Car r For k Project

, Tooele

, Utah

, repor t prepare d fo r Anacond a Company

.

Atlanti c Richfield Compan y 3 1

Marc h 12
, 200 2

## TARGE T

SHEE T E R A REGIO N VII I SUPERFUN D DOCUMEN T MANAGEMEN T SYSTE M DOCUMEN T NUMBER : 2000255______

_ SIT E NAME : ____Internationa l

Smeltin g & Refinin g DOCUMEN T DATE : Marc h 12
, 2002____________

_ 

### DOCUMEN T NO T SCANNE D Du e t o on e o f th e followin g reasons : D PHOTOGRAPH

S D 3-DIMENSIONA

L D OVERSIZE D D AUDIO/VISUA

L D PERMANENTLY

BOUN D DOCUMENT S D POO R LEGIBILIT Y D OTHER D NO T AVAILABL E

0 TYPES OF DOCUMENT

S NOT T O B E SCANNE D (Dat a Packages

, Dat a Validation

, Samplin g Data

, CBI

, Chai n o f Custody ) DOCUMEN T DESCRIPTION : 

### Appendi x A

- Groundwate r Samplin g Database_____________

_

Contac t th e Superfun d Record s Cente r t o view availabl e document

. (303)312-647 39 7 7 Wes t 210 0 Sout h Sal t Lak e City

, Uta h 8411 9 (801)972-622 2 (80 1 (972-623 5 FA X www.andersoneng.cp m 

# ANDERSO N

ENGINEERIN G

COMPANY INC

. Grants

, Ne w Mexic o (505 ) 285-648 4

March 14
, 200 2 0 0

rn :. 

### Joshu a Knight | r Internationa l Smeltin g & Refinin g Remedia l Projec t Manage r ^

> Superfun d Remedia l Section

, 8EPR-S R g' i

. r U S Environmenta l Protectio n Agency

, Regio n VII I

- ^

\.

_ \

- 9 9 9 18 t h Street

, Suit e 30 0 ~ '"'
- Denver

, C O 80202-246 6 * R e : Site Groundwate r Conceptua l Mode l 

### Dear Joshua : Pleas e fin d enclose d your har d cop y o f th e Site Groundwate r Conceptua l Model

. Als o 

### include d i n this packe t i s vide o take n o f th e insid e o f th e well s locate d at o r nea r th e site

. C O



### Sincerely

, ANDERSO N Engineerin g Co.

, Inc

. 

# K

Paulin e Barne y (^ \ 

### Administrativ e Assistan t

cc

. 

### Michae l Storc k Chuc k Stilwel l Reviewed by

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. Anderso n IS&R/Car r For k Projec t Manage r

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