UNITE D STATE S ENVIRONMENTA L

PROTECTIO N AGENC Y REGIO N VII I 9 9 9 18t h STREE T -SUIT E 50 0 1R<U8 ? DENVER

. COLORAD O 80202-246 6 

# ADMINISTRATIV E Ref : 8EPR-S R 3^83^ > RECOR D ACTIO N MEMORANDU M DATE : Apri l 7 , 199 7 SUBJECT : Reques t fo r Remova l (Response ) Actio n a t th e Californi a Gulc h Nationa l Prioritie s Lis t Site

, Leadville

, Colorado : ACTIO N MEMORANDU M fo r a Time

- Critica l Removal Actio n fo r Remova l o f Tailing s Pon d No

. 2 an d Tailing s Pon d No

. 3 o f th e Apach e Tailing s Impoundmen t (Operabl e Uni t 7 ) FROM : Mik e Holmes

, 8EPR-S R T O : Ma x H

. Dodso n Assistan t Regiona l Administrato r Offic e o f Ecosystem s Protectio n an d Remediatio n Fina l NP L Sit e I D #2 9 CERCLI S I D # COD98071793 8 Categor y o f Removal : Time-Critica l I

. Purpos e Thi s Actio n Memorandu m document s th e Agency' s selectio n an d implementatio n o f th e tim e critica l remova l (response ) actio n describe d herei n fo r th e Apach e Tailing s Impoundments

, a n are a contaminate d wit h metal-lade n tailing s fro m histori c minin g an d millin g operations

. Th e Apach e Tailing s Impoundmen t are a comprise s a smal l portio n o f th e Superfun d RI/F S Stud y Are a o f th e Californi a Gulc h Superfun d Site

, locate d i n th e Leadvill e minin g distric t o f Lak e County

, Colorado

. . T h e Tim e Critica l Remova l Actio n a t th e Apach e Tailing s Impoundment s i s consisten t wit h th e remedia l activitie s whic h wil l b e undertake n b y EP A a t O U 7

. Fina l remedia l alternative s fo r al l area s o f O U 7 wil l be evaluate d i n th e Feasibilit y Stud y (FS ) an d Record o f Decisio n (ROD ) fo r OU7

. Th e RO D fo r O U 7 wil l ultimatel y specif y thos e remedia l action s beyon d thos e respons e action s implemente d pursuan t t o thi s Actio n Memorandu m tha t ar e required

. Th e F S wil l

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### evaluat

e th e effectivenes s o f a remed y t o stabiliz e th e tailing s in plac e o r i f th e main 

### impoundmen t wil l nee d t o b e relocate d ou t o f th e Californi a Gulc h floo d plain

. Th e primar y goa l o f thi s Remova l Actio n i s t o preven t exposur e t o huma n population s fro m tailing s washe d int o Californi a Gulc h an d degradatio n o f downstrea m wate r 

### quality

. Thi s remova l actio n wil l als o reduc e th e leachin g an d migratio n o f metal s fro m th e tailing s int o surfac e an d groun d water s durin g stor m event s whic h occu r prio r t o implemtatio n o f remedia l actio n unde r the l RO D fo r OU7

. Regardles s o f 

### t h e remed y selecte d b y th e ROD

, th e respons e action s take n unde r thi s Actio n Memorandu m wil l allo w fo r th e consolidatio n int o a smalle r are a an d th e drying ou t
o f th e tailings

. Remedia l actio n objective s wer e identifie d i n th e Fina l Screenin g Feasibilit y Stud y 

### f o r Remediatio n Alternative s a t th e Californi a Gulc h NP L Site

, Leadville

, Colorad o (SFS)

, (ERA

, 1993a)

. Consisten t wit h th e SFS

, remova l actio n objective s fo r th e Apach e Tailing s Impoundment s are : 

### O Contro l wate r erosio n o f tailing s materia l fro m th e source location s 

### O Contro l leachin g an d migratio n o f metal s fro m tailing s int o surfac e wate r O Contro l leachin g an d migratio n o f metal s fro m tailing s int o groundwate r Remova l alternative s t o directl y remediat e surfac e wate r o r groun d wate r in th e vicinit y o f th e Apach e Tailing s Impoundment s hav e no t bee n evaluated

, an d wil l b e 

### addresse d unde r Operabl e Uni t 12

. I I

. Californi a Gulc h
- Sit e Condition s an d Backgroun d 

### T h e Californi a Gulc h Sit e wa s liste d o n th e Nationa l Prioritie s Lis t o n Septembe r 8 , 1983

. Th e Sit e i s i n a minin g are a coverin g 1 6 1 

### / £ squar e mile s o f a watershe d tha t drain s alon g Californi a Gulc h t o th e Arkansa s River

. Startin g i n 1859 , th e are a wa s mine d extensivel y fo r gold

, lead

, silver

, copper , zinc , an d manganese

. Californi a 

### Gulc h collect s runof f tha t drain s numerou s abandone d mine s an d wastes fro m mining , millin g an d smelting

. Miner s buil t th e Ya k Tunne l t o drai n wate r fro m th e 

### min e working s an d t o mak e minera l exploratio n an d developmen t easier

. Thi s tunne l drain s hundred s o f mile s o f min e working s in it s 4-mil e undergroun d cours e a n d discharge s approximatel y 21 0 ton s o f metal s eac h year int o Californi a Gulch

. 

### Seventy-fiv e know n mill s dumpe d tailing s int o 5- 6 mile s o f drainages

. Si x impounde d tailing s dump s surroun d th e Cit y o f Leadville

. Man y smelters

, whic h ar e 

### locate d aroun d th e city , processe d silver

, lea d an d zin c a t variou s times

. Heav y meta l residue s ar e presen t i n muc h o f th e City

. Th e Arkansa s Rive r which receive s 

### wate r fro m th e Californi a Gulch

, has bee n classifie d as a recreationa l resource , an d

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### is

use d heavil y fo r irrigation , livestoc k watering , publi c wate r supplie s an d fisheries

. 

### Approximatel y 4,000 liv e i n nearb y Leadville an d Lak e Count y (Se e Sit e Locatio n M a p - Figur e 1 ) 

### Apach e Tailing s Impoundment s A

. Backgroun d 

### T h e Apach e Tailing s Impoundmen t consist s o f a mai n tailing s impoundmen t
a n d two, smalle r impoundment s locate d alon g Californi a Gulch

, approximatel y 1,50 0 fee t downstrea m o f th e Ya k Tunne l Wate r Treatmen t Plan t Surg e Pond

, a s illustrate d o n th e attache d Sit e Plan

. Th e mai n 

### impoundmen t encompasse s approximatel y 11. 3 acres

. Th e volum e o f tailing s in th e mai n impoundmen t ha s bee n previousl y estimate d a t approximatel y 630,00 0 cubi c yards

. Th e embankmen t slope s o n th e nort h

an d eas t sid e o f th e mai n impoundmen t rang e fro m 1.5: 1 (H:V ) t o 1.75: 1 an d

reac h height s u p t o 1 5 feet

. Th e embankmen t slop e o n th e southwes t sid e 

### o f th e mai n impoundmen t approache s 1: 1 an d i s u p t o 5 0 fee t i n height

. Th e t w o smalle r impoundments

, TP 2 an d TP 3 ar e locate d wes t o f th e mai n impoundmen t an d directl y nort h an d adjacen t t o wate r flowin g in th e gulch

. 

### T P 2 i s locate d immediatel y wes t o f th e mai n impoundmen t an d cover s a n are a o f approximatel y 1. 5 acres

. TP 3 i s locate d immediatel y wes t o f TP 2


### an d cover s a n are a o f 0. 5 acres

. Th e volum e o f tailing s i n TP 2 an d TP 3 have bee n estimate d previousl y a t approximatel y 8,50 0 an d 3,90 0 cubi c 

### yards

, respectively

. Impoundmen t berm s fo r bot h pond s appea r t o hav e 

### bee n constructe d o f nativ e soi l materia l fro m Californi a Gulch

. Thes e berm s rang e fro m 1: 1 t o 1.5:1 , ar e approximatel y 1 0 fee t i n heigh t an d 1 0 fee t wid e acros s th e top

. 

### T h e majorit y o f surfac e water flo w i n Californi a Gulc h is presentl y conveye d b y th e Californi a Gulc h channe l locate d o n th e sout h sid e o f th e gulc h in th e 

### vicinit y o f th e Apach e Tailing s Impoundment

. Th e channe l intersect s th e souther n edg e o f th e mai n impoundmen t wher e th e flo w i s carrie d b y two 24

- 

### inc h diamete r clay-til e culvert s installe d beneat h a portio n o f th e mai n impoundment

. Surfac e wate r flo w fro m th e are a immediatel y upstrea m (approximatel y 1,00 0 feet ) o f th e mai n impoundmen t an d belo w th e elevatio n o f th e constructe d Californi a Gulc h channe l ar e conveye d unde r th e mai n impoundmen t throug h wha t appear s t o b e a woode n bo x culvert

. Afte r 

### exitin g thes e culverts

, surfac e water continue s t o flo w t o th e northwest

, wes t
o f an d adjacen t t o th e southwes t embankmen t o f th e mai n impoundment

, fo r 

### approximatel y 30 0 fee t befor e turnin g t o th e wes t an d continuin g dow n th e gulc h pas t th e lowe r impoundment s (TP 2 an d TP3)

.

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### A

fiel d investigatio n was conducte d in Novembe r an d Decembe r 199 6 t o supplemen t th e existin g dat a presente d i n th e Remedia l Investigatio n an d 

### Feasibilit y Stud y fo r th e site

. Th e purpos e o f thi s investigatio n wa s t o gathe r dat a 

### t o enhanc e th e evaluatio n o f th e interactio n o f surfac e water an d groundwate r i n th e immediat e vicinit y o f th e Apach e Tailing s Impoundments

. A s par t o f thi s supplementa l fiel d investigation , 1 1 ne w groundwate r monitorin g well s wer e 

### installe d a t th e site

. Tw o round s o f groundwate r an d surfac e wate r samplin g wer e planne d a t th e sit e a s par t o f th e supplementa l investigation ; on e samplin g even t
wa s performe d in Novembe r 199 6 t o coincid e wit h low-flo w condition s a t th e sit e 

### involve d th e samplin g o f 1 8 groundwate r wells

, an d surfac e wate r samplin g a t 2 2 

### locations

. Additiona l detail s ar e provide d i n th e Interi m Remova l Actio n Plan

, Operabl e Uni t 7 , Ca l Gulc h Superfun d Site

, date d Apri l 3 , 199 7 an d a lette r date d Marc h 13 , 199 7 which transmit s th e monitorin g dat a fo r th e samplin g even t describe d above

. Bot h thes e document s ar e attache d t o thi s Actio n Memorandum

. B

. Sit e Characterizatio n - Apach e Tailing s Impoundmen t 

### T h e result s o f previou s investigation s relate d t o th e Apach e Tailing s Impoundmen t ar e presente d i n variou s report s includin g th e Tailing s Disposa l Are a Remedia l Investigatio n Report

, Californi a Gulc h Site

, 

### Leadville

, Colorado

, Januar y 1994, th e Hydrogeologi c Remedia l Investigatio n Repor t (1995)

, an d th e Surfac e Wate r Remedia l Investigatio n Repor t (1995)

. I n Januar y 1996 , a Draf t Feasibility Stud y (FS ) wa s 

### submitte d fo r th e Apach e Tailing s Impoundments

. Subsequen t t o th e submitta l o f th e draf t FS

, additiona l sit e investigatio n activitie s hav e been initiate d t o supplemen t th e previou s investigation s an d t o suppor t completio n oftheFS

. T h e principa l concern s specificall y addresse d b y thi s Remova l Actio n are : 

### * Impact s th e tailing s impoundment s ma y hav e o n surfac e wate r an d 

### groundwate r qualit y i n Californi a Gulch ; an d

* Preparatio n o f th e tailing s material

, primaril y throug h consolidatio n a n d dewatering

, t o facilitat e th e timel y implementatio n o f future

, fina l respons e actions

. 

### * A lette r repor t date d March 13, 199 7 which summarize s groundwate r qualit y dat a fro m samplin g event s performe d i n th e are a o f th e 

### Apach e Tailing s Impoundments

, durin g Novembe r an d December

, 1996 , i s attached

.

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### C

. Othe r Action s t o Dat e 

### * A Tim e Critica l Remova l Actio n wa s performe d b y EP A o n th e Apach e Energy an d Mineral s Propert y which i s include d in Operabl e Unit 7

. T h e actio n involve d removal o f drums an d bag s o f pyrit e an d 

### decontaminatio n an d demolitio n o f building s an d equipment

. Thi s Remova l Actio n wa s addresse d in a separat e Actio n Memorandu m date d Augus t 6 , 1996

. 

### * Durin g th e summe r an d fal l o f 1995 , ASARC O installe d approximatel y 

### 6 horizonta l drai n pipe s t o passivel y drai n wate r fro m th e mai n 

### impoundment

. Th e demonstratio n projec t prove d ineffectiv e i n draining th e tailing s an d wa s abandoned

. Ove r th e pas t several year s ASARC O has monitore d wate r level s o n to p o f th e mai n 

### impoundmen t an d TP s 2 an d 3 an d a s needed

, the ponde d wate r ha s bee n transferre d t o th e Yak Treatmen t plan t t o preven t catastrophi c releas e o f th e metal-lade n wate r int o Californi a gulch

. D

. State an d Loca l Authorities Role s A cultura l resource investigatio n o f th e Apach e Tailing s Are a wa s conducte d in 1995 , an d a sit e wit h potentia l archaeologica l significanc e wa s identified

. 

### Thi s sit e contain s structura l remains an d artifac t scatte r an d i s locate d 

### immediatel y sout h o f Californi a Gulc h belo w th e culver t outfall s o n th e southwes t sid e o f th e main impoundment

. Th e propose d alignmen t o f th e diversio n ditc h wil l no t impac t thi s are a an d additiona l investigatio n o r researc h o n thi s cultura l resourc e sit e ma y b e necessary , prio r t o 

### implementin g th e fina l actions

. Th e initia l focu s o f thi s remova l actio n is t o 

### avoi d an y impact s o n th e are a o f archaeologica l significance

. I V

. Threat s t o Publi c Health o r Welfar e o r th e Environmen t 

### A Fina l Baselin e Aquati c Ecolog y Risk Assessmen t (FBAERA)

, Californi a Gulch

, Leadville

, Colorad o (Ro y F

. Weston

, Inc. ) identifie s th e Site-wid e impac t o f min e 

### wast e contaminatio n o n th e terrestria l an d aquati c ecosystems a t th e Site

. Th e FBAER A provide s a conceptua l mode l o f Site-wid e exposur e fo r aquati c receptors

. Thi s Time-Critica l Remova l Actio n is necessitate d b y th e threa t t o publi c health

, welfar e and/o r th e environmen t pose d b y th e direc t contact , inhalation

, an d ingestio n exposur e routes t o hazardou s substances

. Th e Actio n wil l als o reduc e 

### release s o f metal s t o th e surfac e an d groundwater

.

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### V

. Endangermen t Determinatio n 

### Actua l and/o r threatene d release s o f hazardou s substance s fro m th e Apach e Tailing s Impoundments

, i f no t addresse d b y implementin g th e remova l actio n 

### selecte d i n thi s Actio n Memorandum

, present s endangermen t t o publi c health

, o r welfare

, o r th e environment

. Th e publi c an d environment wil l continue d t o b e expose d t o th e releas e o f significan t quantitie s o f contaminate d materials

. V I

. Propose d Actions/Schedul e 

### A

. Propose d Action s 

### 1

. Th e propose d interi m action s ar e describe d i n th e Interi m Removal Actio n 

### Plan

, Operabl e Uni t 7 , Apach e Tailing s Impoundments

, Californi a Gulc h Superfun d Site

, date d April 3 , 1997

. A cop y o f this repor t i s attached

. Th e 

### propose d interi m actions includ e th e following : 1. 1 Remova l o f T P 2 and TP 3 and consolidatio n o f th e materia l on t h e mai n impoundmen t an d eithe r divertin g Californi a Gulc h


### awa y fro m the southwes t embankment o f the mai n impoundmen t belo w th e clay-til e culvert s an d woode n bo x culvert s outfalls

, o r providin g erosion protectio n alon g th e to e o f th e tailing s embankmen t area
. Th e exten t o f tailings

, berm s materia l an d nativ e soi l t o be remove d wil l b e determine d b y visua l observatio n durin g 

### excavation

. Confirmatio n sample s o f th e impoundmen t berm s wil l be take n t o determin e suitabilit y fo r us e as backfil l material

. Onl y materia l wit h a lea d concentratio n belo w 3,50 0 

### p p m wil l b e used

. 

### F o r thi s removal action , slop e stabilit y concern s wil l b e addresse d throug h th e applicatio n o f Bes t Managemen t 

### Practice s (BMPs )


### 1 . 2 Surfac e wate r tha t i s currentl y ponde d o n TP 2 an d TP 3 wil l b e remove d prio r t o initiating excavatio n b y pumpin g th e wate r t o t h e existin g pon d o n th e mai n impoundmen t fo r ultimat e transfe r t o th e Yak Tunne l Wate r Treatmen t Pla n (WTP)

, o r b y 

### transportin g it t o th e WT P usin g tanke r trucks

. Th e base o f T P 2 an d TP 3 ma y currentl y be belo w th e groundwate r tabl e i n this are a and

, therefore

, dewaterin g durin g excavatio n ma y be required

. Wate r remove d durin g excavatio n wil l be pumpe d t o 

### t h e existin g pon d o n th e mai n impoundment

. Followin g

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### excavation , clea n fil l wil l b e place d t o restor e th e area , promot e surfac e drainag e an d preven t ponding

. Propose d approximat e fina l contour s ar e show n o n th e figur e entitle d 199 7 Propose d Interi m Action

. 1. 3 Th e excavate d tailing s wil l b e transporte d t o th e mai n 

### impoundmen t usin g th e temporary roa d fro m th e wes t sid e o f th e impoundmen t nea r th e ol d foundation s t o th e ne w wel l 

### installation s nea r th e cente r o f th e impoundmen t (AP1TMW12 )

an d place d o n th e nort h sid e o f thi s road

, a s indicate d o n th e 199 7 Propose d Interi m Actio n Figure

, attached

. I t i s 

### anticipate d that placemen t ma y be achieved utilizing lo w groun d pressur e equipmen t withou t th e us e o f geotextil e o r 

### geosyntheti c subgrad e suppor * Th e installatio n o f several settlemen t plate s in th e fil l placemen t are a i s als o propose d t o monito r th e settlement/consolidatio n

o f th e underlyin g tailing s a s a result s o f loading fro m th e fill

. 1. 4 Potentiall y contaminate d surfac e run-of f fro m th e mai n impoundmen t wil l be directe d throug h th e are a betwee n TP 2
an d th e mai n impoundmen t t o a sedimen t contro l structur e a s 

### indicate d o n Figur e 4

. Th e sedimen t control structur e wil l consis t o f a n earthe n ber m wit h a ha y bal e cor e an d a roc k o r rip-ra p line d discharg e notc h intende d t o intercep t an d retain sedimen t in stor m wate r run-off

. Thi s structur e wil l b e maintaine d until th e fina l remed y i s implemented

. Diversio n o f uncontaminate d surfac e run-of f alon g th e nort h sid e o f th e main impoundmen t wil l als o be maintaine d o r upgrade d t o minimiz e potentia l contac t wit h tailing s materia l o r othe r 

### potentiall y contaminate d flows

. 1. 5 Th e following activitie s involvin g th e protectio n o f th e to e o f 

### th e mai n impoundmen t embankment ar e proposed

. Thes e activitie s wil l includ e excavatio n o f tailings

, primaril y a t th e 

### kno b whic h extend s towar d th e channe l approximatel y 10 0 fee t belo w th e clay-til e culver t outfalls

, an d th e placemen t o f clea n 

### fil l and/o r ripra p fo r erosio n protectio n a t th e to e o f th e embankment

. B

. Applicabl e o r Relevan t an d 

### Appropriat e Requirement s (ARARs ) T h e ARAR s liste d o n TABL E F. 1 AN D F. 2 wil l b e followe d t o th e extent 

### practicable

. Copie s o f thes e Table s ar e attached

.

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### C

. Performanc e Standard s T h e ARAR s wer e me t throug h complianc e wit h Performanc e Standards

. 1

. Th e designe d an d constructe d respons e actio n include d provision s t o ensur e tha t ther e ar e n o visibl e emission s (dust ) durin g remova l activitie s a t 

### t h e Apach e Tailing s Impoundments

. Dust contro l o n th e hau l route , an d othe r areas , wil l be maintaine d throug h wate r application

, a s necessary

. 2

. Durin g the excavation, on-sit e transport , an d placemen t o f tailing s material

, appropriat e engineerin g control s wil l b e maintaine d t o contro l stor m wate r 

### runof f an d dus t generation , sil t fences

, ha y bale s and/o r othe r sedimen t contro l devices wil l b e use d t o intercep t an d retai n sedimen t i n stor m wate r runof f (bot h fro m th e mai n impoundmen t an d TP2/TP3)

. Th e sedimen t control structures wil l b e lef t i n place

, as necessar y followin g th e completio n o f excavation

. Un-contaminate d

surfac e wate r wil l be diverte d awa y fro m t h e tailing s t o minimiz e contact wit h tailings

. 3

. A long-ter m maintenanc e progra m ma y b e implemente d i f require d b y the Fina l Recor d o f Decisio n fo r Operabl e Uni t 7 (Oi l 7 ) t o ensur e th e long-ter m effectivenes s o f th e respons e action

. D

. Projec t Schedul e 

### April-May 199 7 - Californi a Gulc h Belo w th e Culvert s June-Jul y 199 7 - Removal o f Ponde d Wate r fro m TP@

, TP 3
a n d Mai n Impoundmen t August-Septembe r 199 7 - Removal o f TP 2 an d TP 3 E

. Estimate d Cost s 

### Thi s respons e actio n i s bein g conducte d b y ASARCO

, Inc

.

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### VII

. Expecte d Chang e i n th e Situatio n Should Actio n B e Delaye d o r N o t Take n 

### I f thi s Time-Critica l removal actio n i s delayed

, o r no t taken

, exposur e o f th e publi c an d environmen t t o heav y metal s containe d i n th e min e wast e locate d i n th e Apach e Tailing s Impoundment s wil l continue

. Withou t thi s time-critica l response , releas e o f contaminate d tailing s int o Californi a Gulc h an d th e Arkansa s Rive r wil l 

### continu e t o contaminat e surfac e wate r an d groundwate r i n th e are a aroun d th e Apach e Tailing s Impoundments

. VIII

. Outstandin g Polic y Issue s A Recor d o f Decisio n wil l b e issue d selectin g th e fina l remedia l actio n fo r Operabl e Uni t 7 (OU 7 ) o f thi s Site

. 

### I X

. Enforcemen t Thi s Time-Critica l Remova l Actio n wil l b e performe d by ASARCO

, Inc

.

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### X

. Recommendatio n 

### Thi s decisio n documen t represent s th e selecte d Time-Critica l remova l actio n fo r th e 

### Apach e Tailing s Impoundment s portio n o f OU 7 o f th e Californi a Gulc h Superfun d Site

, i n th e Cit y o f Leadville

, Count y o f Lake

, Stat e o f Colorado

. I t wa s develope d 

### i n accordanc e wit h CERCLA

, a s amended

, an d i s no t inconsisten t wit h th e NCP

. Thi s decisio n i s base d o n th e Administrativ e Recor d fo r th e Site

. 

### Condition s a t th e Apach e Tailing s Impoundment s mee t th e NC P Sectio n 300.415(b)(2 ) criteri a fo r a removal an d I recommen d approva l o f th e remova l action

. APPROVA L

»-w

^ 

### Dodso n \ 

### Assistan t Regiona l Administrato r Offic e o f Ecosystem s Protectio n an d Remediatio n
DISAPPROVAL



### M a x H

. Dodso n Assistan t Regiona l Administrato r 

### Offic e o f Ecosystem s Protectio n an d Remediatio n

Q v r Printed o n Recycled Paper 1 0

## C

O L\O R A D O

CALIFORNIA GULCH SUPERFUND SITE

Project No.: 01-283 file: RESWLOC.DWG Design

By: D EVANS Drawn By: T.BOEHLER ( I F SUHOECTIO N

MININ G COMPAN Y O N E UNI'E O BAN * CENtC R iro o LINCOL N STREE T DENVER

. COLORAD O aQto l Sco(«

. H/A

Date: JUNE 1995 

### FIGURE 1 

### CALIFORNIA

GULCH SITE 

### GENERAL LOCATIONTABL E F. I SUMMAR Y O F POTENTIA L FEDERA L AN D STAT E CHEMICAL-SPECIFI

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N o Not applicabl e becaus e n o communit y wate r suppl y system

. Potentiall y relevan t an d appropriat e fo r th e fina l Sit e remedy

, i.e.,OU12

. Not applicabl e or relevan t and appropriat e for thi s remova l action

. Potentiall y relevan t an d appropriat e fo r th e fina l Sit e remedy

, i.e. , OU12

. Thes e standard s ar e applicable

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. Potentiall y relevan t an d appropriat e fo r th e fina l Sit e remedy

, i.e. , OU12

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, howeve r i t i s no t expecte d tha t a t Sit e woul d eve r violat e thes e standards

.

A - lTABL E F. 2 SUMMAR Y O F POTENTIA L FEDERA L AN D STAT E LOCATION-SPECIFI

C ARAR S

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Endangere d Specie s Ac t

Fis h an d Wildlif e Coordinatio n Ac t

Wildernes s Ac t
Executiv e Orde r No

. 1 198 8 Floodplai n Management Executive Orde r No

. 1 199 0 Protectio n o f Wetland s Sectio n 404 , Clea n Wate r Act (CWA ) .;.;.;
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Provide s protectio n fo r threatene d and endangered species an d thei r habitats

. Site-specifi c studie s di d no t documen t th e presenc e o f threatene d o r endangere d species

. Require s coordinatio n wit h federa l an d stat e agencie s t o provid e protectio n o f fis h and wildlif e i n wate r resourc e developmen t programs ; regulate s action s tha t impound

, divert

, control

, o r modif y an y bod y o f water

. Limit s activitie s withi n area s designate d a s wilderness area s o r Nationa l Wildlif e Refug e Systems

. Pertains t o floodplai n managemen t and constructio n an d impoundment s i n suc h areas

. Minimize s adverse impact s o n area s designate d a s wetlands

. Regulate s discharg e o f dredge d o r fil l material s int o water s o f the Unite d States

. Substantiv e requirement s o f portion s o f Nationwid e Permi t No

. 3 8 (Genera l and Specifi c Conditions ) ar e applicabl e t o OU 7 remova l activitie s conducte d withi n water s o f th e Unite d States

. A- 2TABL E F. 2 SUMMAR Y O F POTENTIA L FEDERA L AN D STAT E LOCATION-SPECIFI

C ARAR S

Th e Histori c an d Archaeologica l Dat a Preservatio n Ac t o f 1 97 4 1 6

US C 46 9 40CFR§6.301(c ) Y e s Establishe s procedures t o preserv e historica l an d archeologica l dat a tha t migh t b e destroye d throug h alteratio n o f terrai n a s a resul t o f a federa l constructio n projec t o r a federall y license d activit y program

. A cultural
resourc e surve y wa s complete d i n OU 7 t o identif y histori c propertie s whic h ma y b e affecte d b y remova l activity

. Nationa l Histori c Preservatio n A c t (NHPA ) 16USC§470etsea

.

40CFR§6.301(b ) 3 6 CF R Par t 63 , Par t 65 , Par t 80 0 Y e s Expand s histori c preservatio n programs ; require s preservatio n o f
resource s include d i n o r eligibl e fo r listin g o n the Nationa l Registe r fo r Histori c Places

. Executive Orde r 1 159 3 Protectio n an d Enhancemen t o f th e Cultura l Environmen t 1 6

US C § 47 0 Y e s Direct s federa l agencie s t o institut e procedures t o ensur e program s contribut e t o th e preservatio n an d enhancemen t o f non-federall y owne d histori c resources

. Consultatio n wit h th e Advisor y Counci l o n Histori c Preservatio n i s require d i f remova l activities shoul d threate n cultural
resources

. Histori c Site s Ac t o f 1 93 5 1 6

US C §4 6 1-46 7 N

o N

o Preserve

s fo r publi c us e histori c sites , buildings

, and object s o f natura l significance

.

A- 3TABL E F. 2 SUMMAR Y O F POTENTIA L FEDERA L AN D STAT E LOCATION-SPECIFI

C ARAR S


## gillill l l H : : : x : : : : : : : : : :¥x : : : X'K-x-x-x-: : X T h e Archeologica l Resource s Protectio n Act o f 197 9 16USC§§470aa-4701 1 N o Y e s Require s a permi t fo r an y excavation o r remova l o f archeologica l resource s fro m publi c land s o r India n lands

. Mayb e relevan t and appropriat e i f archeologica l resource s encountere d durin g remova l activity

. Resourc e Conservatio n an d Recover y Ac t (RCRA)

, Subtitl e D 4 0

CF R Par t 257 Y e s Provide s genera l classificatio n criteri a f o r soli d wast e disposa l facilitie s pertainin g t o floodplain s an d safety

. Nongame

, Endangere d o r Threatene d Specie s Ac t CR

S § § 33-2-10 1 t o 10 8 N

o N

o Standard

s fo r regulatio n o f nongam e wildlif e an d threatene d an d endangere d species

. Site-specifi c studies di d not documen t th e presenc e o f threatene d o r endangere d species

. Colorad o Registe r o f Histori c Place s CR S

S S 24-80.1-10 1 t o 10 8 Y e s (see description)

. Authorizes th e Stat e Historica l Societ y t o nominat e propertie s for inclusio n on th e Stat e Registe r o f Histori c Places

. Applicabl e onl y i f remova l activitie s impac t a n are a liste d o n th e Register

. Colorad o Historical

, Prehistorical

, and Archaeologica l Resource s Ac t CR

S §§24-80-40 1 t o 41 0 130 1 t o 1305 N

o Y e s Concern s historical

, prehistorical

, and archaeologica l resources; applie s onl y t o area s owne d b y th e Stat e o r it s politica l subdivisions

. Ma y b e relevant and appropriat e i f remova l activities impac t a n archaeologica l site

.

A- 4TABL E F. 2 SUMMAR Y O F POTENTIA L FEDERA L AN D STAT E LOCATION-SPECIFI

C ARAR S

Colorad o Specie s o f Specia l Concer n an d Specie s o f Undetermine d Statu s Colorad

o Division o f Wildlif e Administrativ e Directive E-l

, 1985 , modifie d N

o Protect s species liste d o n the Colorad o Divisio n o f Wildlif e generate d list

. Urge s coordination wit h th e Division o f Wildlif e i f wildlif e species ar e t o b e impacted

. N o evidence o f species o f specia l concer n hav e bee n identifie d a t thi s site

. Colorad o Natura l Area s Colorad

o Revise d Statutes

, Titl e 3 3 Articl e 33, Sectio n 10 4 N

o Maintain s a lis t o f plan t species o f "specia l concern. " Althoug h no t protecte d b y Stat e statue , coordinatio n wit h Division o f Park s an d Outdoor Recreatio n i s recommende d i f activitie s wil l impact liste d species

. Colorad o Soli d Wast e Disposa l Site s an d Facilitie s Act

, Colorad o Revise d Statutes

, Titl e 30 , Articl e 20, Section s 101-11 8 6

CC R 1007- 2

6 CC R 1007-2 , Par t I Y e s Establishe s regulations fo r soli d wast e managemen t facilities

, includin g locatio n standards

. Establishe s broa d sitin g criteri a an d sit e evaluatio n procedure s fo r individua l storag e and disposa l unit s (i.e.

, impoundments

, landfills

, etc.)

.

A- 5TABLE F. 3 SUMMAR Y O F POTENTIA L FEDERA L AN D STAT E ACTION-SPECIFI

C ARAR S



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wmmwWm tWWtemmmm® Soli d Wast e Disposa l Ac t a s amende d b y th e Resourc e Conservatio n an d Recover y Ac t of!976(RCRA ) Hazardou s Material s Transportatio n Ac t Occupationa l Healt h an d Safet y A c t (OSHA ) Federa l Min e Safet y an d Healt h A c t (MSHA )

'<-:-\-:-:-:'<-:-\-:'-:<<<<-\-\-:'<-^^^ ••:•:-•-:•:-:•:•:•:•:•:•:•:•:•:•:•:•:-:•:•:•:•:•:•:•:•:-:•:•:•:•:•:•:•:•:•:•:•:•:•:•:•:•:•;-:•:•:•:•:•:•:-:•:•:•:•:•:•:•:•:•:•;•:•:•:•:•:-:•:•:•; • Colorad o Soli d Wast e Disposa l Site s an d Facilitie s Ac t Colorad o Wate r Qualit y Contro l Act

, Stor m Wate r Discharg e Regulation s 4 2

US C §69 0 1-698 7 4 0 CF R Par t 25 7

4 9 US C §1801-181 3 4 9 CF R 107 , 171-17 7

2 9 US C §651-67 8

3 0 US C § 800-96 2 Y e s

— N o
N o Y e s

N o
N o Selecte d

portion s o f Par t 25 7 establis h criteri a fo r determinin g whic h soli d wast e disposa l facilitie s an d practices pos e a reasonabl e probabilit y o f adverse effect s o n health

. Applicabl e t o lan d disposa l o f non-hazardou s soli d waste

. Regulate s transportatio n o f hazardou s materials

. Remova l actio n withi n OU 7 wil l not entai l off-sit e transportatio n o f hazardou s material s bu t ma y involve use o f publi c roads

. Regulate s worke r healt h an d safety

. Regulations ar e no t environmenta l requirements , bu t wil l b e adhere d t o a s appropriate

. Establishe s requirement s t o protec t worke r healt h and safet y i n an d aroun d mines

. Regulations ar e no t environmenta l requirements , bu t wil l b e adhere d t o a s appropriate

.

6 CC R 1007- 2

5 CC R 1002- 2 Y e s

Y e s Establishe s standard s fo r licensing

, locating

, constructin g an d operatin g soli d wast e facilities

. Applicabl e onl y i f

remova l action s wil l involve establishmen t o f a soli d wast e disposa l facility

. Establishe s requirement s fo r stor m wate r discharge s (excep t portion s relatin g t o Site-wid e Surfac e an d Groundwater)

. Substantiv e requirement s fo r stor m wate r discharge s associate d wit h constructio n activitie s ar e applicable

.

A- 6TABL E F. 3 SUMMAR Y OF POTENTIA L FEDERA L AN D STAT E ACTION-SPECIFI

C ARAR S

-•-••••••••••••••••••••••••••••• • Colorad o Mine d Lan d Reclamatio n Act CR

S 34-32-10 1 t o 125 Rul e 3 o f Mineral Rule s an d Regulations Y e s Regulate s al l aspect s o f lan d us e fo r mining , includin g the locatio n o f minin g operation s an d relate d reclamatio n activities an d othe r environmenta l an d socio-economi c impacts

. Substantiv e requirement s o f selecte d portion s o f Rul e 3 regardin g Reclamatio n Measures

, Wate r Genera l Requirement s (excep t portion s relatin g t o Side-wid e Surfac e an d Groun d Water)

, Wildlife

, an d Revegetatio n are applicable

. Colorad o Ai r Qualit y Contro l Ac t 5 CC R 1001-3 ; Sectio n III.D.l.a.(i ) Section s II.D.2.b

. an d g
. Regulatio n 1 Yes (se e description ) Onl

y provision s o f Act unde r Regulatio n No

. 1 concernin g fugitiv e emission s fo r constructio n activitie s an d tailin g pond s ar e applicabl e ( 5 CC R 1001-3 ; Section s II.D.2. b an d Colorad o Nois e Abatemen t Ac t CRS §§25-12-10 1 t o 10 8 Y e s Establishe d maximu m permissibl e nois e level s fo r particula r tim e period s an d lan d use relate d t o constructio n projects

. Regulations on th e Collectio n o f Aquatic Lif e 2

CC R 406-8 , Ch

. 13 , Articl e III

, Sec

. 131 6 N

o N

o Requirement

s governin g th e collectio n o f wildlif e fo r scientifi c purposes

. Remova l activitie s withi n OU 6 wil l no t trigge r biologica l monitoring

. Colorad o Hazardou s Wast e Regulations 6 CC R 1007- 3 N

o Y e s Certai n portion s o f RCR A Subtitl e C requirement s ma y b e relevan t an d appropriat e clean-u p standard s fo r conductin g remedia l o r remova l action s a t certai n portion s o f th e Sit e i f wast e materia l fail s TCLP

, and/o r i f wast e materia l i s locate d s o tha t i t come s i n contac t wit h surfac e and/o r groundwater

. Colorad o Air Qualit y Contro l Ac t 5 CC R 1001- 4 Regulatio n 2 Odor s Y e s Applicabl e i f wor k i n tailin g impoundment s caus e odors

.

A- 7Colorad

o Ai r Qualit y Contro l Act 5 CC R 1001- 5 Regulatio n 3 APEN s Y e s Substantiv e provision s o f APEN s wil l b e met

.

A- 8.SPR 3

. APACH E TAIUNGS IHPQUNOMEKr S

i - i / j o FOT T KATOU C ocooer c vomy a DM W t f ic z Naunwo tnmtM

. w n> « ncuR E 1 SFT E PLA N SHOWIN G MONITORIN G LOCATION S REV : ;

ftBRUARY

. 199 7 B Y : SCGfCHf-CKED : Dl L McCULLEY

. FRIC K & OILMAN

, INC

.FIGUR E 2 NOV

. '9 6 - PRELIMINAR Y SURFAC E WATE R MONITORIN G DAT A PROJECT : 5344. 3 I DATE : FEBRUARY

. 199 7 REV : —— — __ [JY : SCG I CHECKED : Dl McCULLEY

, FRIC K t t OILMAN

, INC

. provftffng environmental con*uff** 7 Ortt f enyftttfing2/Vt P:\5344V5I4*-12.I>« C

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APPROXIMAT E BAS E O F TAILING S NATN E UATERML S
N W 3

00 0 10 0 20 0 30 0 40 0 SO O 

### NOTES : 1

. GROUMDWATE

R ELEVATO N DAT A FRO M NO^MBE R 1S96

. 2

- NATIV E MATERIAL S REFER S T O GLACIA L OUTWASH

, RECEN T ALLUVIU M AND/O R FILL MATERIA L
3

. NW 3 PROJECTE D 5 0 FEE T ONT O TH E CROS S SECTION ; P3 4 PROJECTE D 3 O FEE T ONT O TH E CROS S SECTION

. LEVE

L 60 0 70 0 80 0 STATIO N (FEET ) WEL L I D (WATE R LEVE L ELEVATION ) GROUN D SURFACE SCREE N INTERVA L TOTA L DEPI H O F BORIN G 90

0 100 0 110 0 120 0 13O O 14O O 1500

10 0 HORIZONTA

L SCALE
VERIKM

. SCAL E 10 0 FEE T

3 0 0

3

0 FEE T VERTICA L EXAGGERATIO

N = 3.3 3 ASARCO ARACH E TMUHG S MPOUMtHOfT S 

### CROS S SECTION 

### A-A PRDviECT : 534 4

. 0 RBft l DATE :

UtRCH

. 1997 B V : RA3 | CHECMEO : gS C McCUtlEY

. FFBC K & GiLUAW

, IM C I ' l

: ' x •.T

.2/J 7

ncun e 4 199 7 INTERI M REMOVA L ACTIO N PLA N PROJECT : 53*4- i I DA.TF j FEBHUMTT

. 199 7 I McCULLEY

, FRIC K & GILUAN

. INC

. O I ' )providin g environmenta l

484 Pear l Eas t CIrcl e Suit e 2OO W consultin g an d Boulder

. Colorad o 8O3O 1 engineerin g service s 3O3/447-182 3 Fax:447-183 6 McCulle y

c
. Vi a U.S. Mail Marc h 13 , 199 7 M F C Jo b No

. 5344. 2 Ms

. Rebecc a Thoma s Remedia l Progra m Manage r U.S

. EP A Regio n VI H 99 9 18t h Street

, Suit e 50 0 Denver

, C O 80202-240 5 

### R E : TRANSMTTTA

L O F MONITORIN G DATA ; OPERABL E UNI T 7 - APACH E TAILING S Dea r Rebecca : W e ar e please d t o provid e fou r copie s o f a draf t tabl e summarizin g surfac e water and groundwate r qualit y dat a fro m samplin g event s performe d durin g Novembe r an d Decembe r 199 6 a t th e Apach e Tailing s area
. The Decembe r monitorin g include d samplin g a t the inflo w and outflo w o f the woode n bo x culver t (APU 1 an d APD1 ) durin g treatmen t plan t shutdown

. Flo w di d no t occu r a t th e adjacen t Californi a Gulc h station s (APU P an d APDNl ) durin g th e plan t shutdow n monitoring

. Becaus e th e dat a validatio n proces s i s not full y complete

, the dat a and associate d qualifier s shoul d b e considere d preliminary

. Als o enclose d are a sampl e sit e locatio n ma p and a tabl e whic h summarize s constructio n detail s fo r ne w an d pre-existin g well s i n the vicinit y o f Apache

. Afte r th e dat a validatio n proces s i s complete

, w e wil l distribut e a revise d versio n o f th e dat a table

, i f necessary

. I f yo u hav e an y questions , pleas e d o no t hesitat e t o call

. Sincerely

, 

### MCCULLEY

, FRIC K & OILMAN

, INC

. Benc e V

. Close

, P.E

. Senio r Engineer/Geohydrologis t Associat e BVC:sj c lc : Rus s Alien

, CDPH E Austi n Buckingham

, CDPH E

'--- '- . Fer n Daves

, Asarc o • Ro d Grebb

, WESTE C

_ To m Hesemann

, RM C Mik e Holmes

, EP A
~ Pau l Rosasco

, EM S ^

: . . Gar y Slifka

, Asarc o ~ ^ ? Sher m Worthington

, SM I

— :

~ ~ T ?

• J:\5344\COMM\RTHOMAS2.LT

R £

»~ » Albuquerque

. N M • Austin

. T X • Boston

. M A • Boulder

, C O • Missoula

. M T • Por t Lavacq

. T X • Sa n Francisco

. C A • Seattle

, W A • Wallace

. I D S iDRAF T TABL E 1 OPERABL E UNI T 7 - APACH E TAILING S GROUNDWATE R SAMPLIN G RESULT S NOVEMBE R 199 6 SAMPL E LOCATIO N L A B NUMBE R SAMPL E NUMBE R SAMPLE DAT E Fiel d Parameter s p H (units ) Conductivit y @25 C (umhos/cm ) Majo r Constituent s an d Inorganic s Calciu m (mg/L ) Chlorid e (mg/L ) Fluorid e (mg/L ) Magnesiu m (mg/L ) Nitrit e as N (mg/L ) Nitrat e as N (mg/L ) Nitrate/Nitrit e a s N (mg/L ) Potassiu m (mg/L ) Sodiu m (mg/L ) Sulfat e (mg/L ) Phosphorus

, dissolve d (mg/L ) Phosphorus

, orth o dissolve d (mg/L ) Metals

, Dissolve d Arseni c (mg/L ) Cadmiu m (mg/L ) Coppe r (mg/L ) Iro n (mg/L ) Lead (mg/L ) Manganes e (mg/L ) Zin c (mg/L ) Othe r Wate r Qualit y Parameters Tota l Alkalinit y (mg/L ) Bicarbonat e a s CaC0 3 (mg/L ) Carbonat e as CaC0 3 (mg/L ) Cation-Anio n Balanc e (% ) Dissolve d Organi c Carbo n (DOC ) (mg/L ) Hardnes s a s CaC0 3 (mg/L ) Hydroxid e a s CaC0 3 (mg/L ) Residue

, Filterabl e (TDS ) (mg/L ) Residue

, Non-Filterabl e (TSS ) (mg/L ) AP1TMW

1 L 1 1863-2 0 M-AP1TMWI-01-11249 8 11/24/9 6

3.2 2 548 0

530 9 0. 1 U 40 0 0.0 1 U 0. 8 B 0. 8 B 2 0 U 2 0 B 440 0 0.00 5 U 0.03 2 J

0.0 2 U 0.25 6 0.4 2 46 0 0.57 5 36 9 21 7

2 U 2 U 2 U 12. 1 2 B 297 0 2 U 695 0 6 B AP1TMW

2 L 1 18 1 9-0 7 M-AP1TMW2-01-111W

6 11/19/9 6

6.4 1 80 3

11 8 3 B 0. 1 U 49. 6 0.0 1 U 0.6 2 0.6 2 1. 8 6. 6 45 0 0.00 8 B 0.00 5 U

0.00 5 U 0.00 2 B 0.0 1 U 0.0 2 B 0.001 U 1.5 3 0.9 3

4 7 4 7 2 U 0. 3 U 1 B 49 9 2 U 72 0 5 U AP1TMW

7 L 1 1808-0 2 M.AP1TMW7.01-11U9 6 11/18/9 6
7.4 6 73 6
94. 1 9 0. 1 U 39. 8 0.0 1 U 2.6 5 2.6 5 1. 3 4.3 25 0 0.01 5 B 0.00 5 U

0.00 1 U 0.000 2 U 0.0 1 U 0.0 1 U 0.000 2 U 0.00 5 U 0.0 1 U

12 1 121 2 U 0. 5 1 U 39 9 2 U 52 0 5 U AP1TMW

9 L 1 1863-2 2 M-APITMW9-01-11249 S 11/24/9 6
6.5 5 953 0

41 1 1 1 0. 9 209 2 0.0 5 0.0 2 U 0.0 2 U 7 0 6 B 910 0 0.00 5 U 0.02 5 J

0.0 2 U 0.00 8 B 0. 1 U 28. 5 0.00 4 U 6.5 1 0. 1 U

10 1 10 1 2 U 0. 7 1 2 963 0 2 U 1216 0 8 B AP1TMW11 S

L 1 1863- 1 5 M-AP1TMW11S-OM124 9 11/24/9 6

6. 5 667 0
44 3 6 0. 3 B 122 8 0.0 8 0.8 4 0.9 2 7 0 2 4 5600 0.00 7 B 0.00 5 U J

0.0 2 U 0.0 4 0.0 4 U 10. 1 0.00 4 U 65. 6 65. 1
38 3 38 3 2 U 2. 9 4 B 615 0 2 U 760 0 5 2 AP1TMW11 D

L11863-1 7 M-APITMW 1 ID-01- 1 124 8 11/24/9 6

5.8 4 121 0

13 4 1 B 0. 1 B 67. 1 0.0 1 U 6. 3 6. 3 2. 8 5. 7 60 0 0.00 5 U 0.00 5 U J

0.00 5 U 0.07 1 0.0 1 U 4.5 5 0.08 6 18. 7 30. 6

5 7 5 7 2 U 2. 9 2 B 61 1 2 U 100 0 8 B AP1TMW12 S

L 1 1863- 1 8 M-AP1TMW12S-01-1124 6 11/24/9 6
6.1 7 843 0

40 4 1 4 0. 8 166 1 0.0 8 0.02. U 0.0 2 B 8 7 1 4 780 0 0.00 5 U' 0.00 5 U J j

0.0 5 U 0.0 2 B 0.0 5 U 13 2 0.0 1 U 16. 9 2.8 2
12 2 12 2 2 U 0. 3 6 784 0 2 U 1046 0 5 8 Dat a validatio n no t full y complete ; dat a qualifier s ma y be added

, modifie d o r delete d upo n completio n o f th e dat a validatio n process

. U = no t detecte d a t th e indicate d metho d detectio n limi t (MDL ) B = Anaryt e concentratio n detecte d at a value betwee n th e MD L an d th e practica l quantitatio n limi t (PQL ) J = estimate d valu e N R = not reporte d J:\5344\96SAMP\NOV96DAT.WB 2 Pag e 1 o f 3 McCulley

, Fric k & Oilman

. Inc

. Marr h 1 ? 1P9 7DRAF T TABL E 1 OPERABL E UNI T 7 • APACH E TAILING S GROUNDWATE R SAMPLIN G RESULT S NOVEMBE R 199 6 SAMPL E LOCATIO N L A B NUMBE R SAMPL E NUMBE R SAMPL E DAT E Fiel d Parameter * p H (units ) Conductivit y @25 C (umhos/cm ) Majo r Constituent s an d Inorganic * Calciu m (mg/L ) Chlorid e (mg/L ) Fluorid e (mg/L ) Magnesiu m (mg/L ) Nitrit e as N (mg/L ) Nitrat e a s N (mg/L ) Nitrate/Nitrit e a s N (mg/L ) Potassiu m (mg/L ) Sodiu m (mg/L ) Sulfate (mg/L ) Phosphorus

, dissolve d (mg/L ) Phosphorus

, orth o dissolve d (mg/L ) Metals

, Dissolve d Arseni c (mg/L ) Cadmiu m (mg/L ) Coppe r (mg/L ) Iro n (mg/L ) Lea d (mg/L ) Manganes e (mg/L ) Zin c (mg/L ) Other Wate r Qualit y Parameters Tota l Alkalinit y (mg/L ) Bicarbonat e a s CaCO 3 (mg/L ) Carbonat e as CaC0 3 (mg/L ) Cation-Anio n Balanc e (% ) Dissolve d Organi c Carbo n (DOC ) (mg/L ) Hardnes s a s CaCO 3 (mg/L ) Hydroxid e a s CaC0 3 (mg/L ) Residue

, Filterabl e (IDS ) (mg/L ) Residue

, Non-Filterabl e (TSS ) (mg/L ) AP1TMW12 D

L 1 1863-2 1 M-AP1TMW12D-01-11J4 8 11/24/9 6 S.4 9 178 0

196. 0 2 B 0. 1 U 101. 0 0.0 2 B 6. 5 6. 5 6. 6 9. 9 103 0 0.01 4 B 0.00 5 U

0.00 5 U 0.03 4 0.0 4 B 23. 7 0.01 9 37. 2 19. 0

2 U 2 U 2 U 2. 4 3 B 90 5 2 U 155 0 5 4 AP1TMW13 S

L 1 18 1 9-0 2 M.AP1TMW13S-01-111 W 11/19/9 6
6.8 8 68 8

82. 2 2 B 0. 1 U 33. 5 0.0 1 U 0.0 4 B 0.0 4 B 1. 3 2. 5 27 0 0.00 5 U 0.00 5 U

0.00 5 U 0.07 7 0.0 1 B 0.0 1 U 0.02 3 0.28 5 1 1

8 6 8 6 2 U 0. 6 U 1 B 34 3 2 U 46 0 5 U AP1TMW13 D

L 1 1819-0 1 M-AP1TMWt3D-01-111 M 11/19/9 6
7.1 9 93 8

120 3 B 0. 1 U 51. 3 0.0 1 U 0.2 6 0.2 6 1. 5 6. 4 37 0 0.00 7 B 0.00 5 U

0.00 5 U 0.00 2 B 0.0 1 U 0.0 1 B 0.00 1 U 0.30 4 0.0 1 U

12 3 12 3 2 U 1 1 U 51 1 2 U 67 0 5 U AP1TMW14 S

L 1 18 4 5- 1 5 M-AP1TMW14S-01-112 M 11/20/9 6

2.1 7 2819 0
51 0 6 0. 1 U 510 0.0 1 U 0. 4 U 0. 4 U 3 0 U 3 0 U 6080 0 68. 8 4 9
48. 9 10.2 4 7 2716 7 0.0 9 B 77 3 163 9
2 U 2 U 2 U 11. 7 11 2 337 0 2 U 10339 0 112 8 AP1TMW14 0

L 1 1845-1 6 M-AP1TMW14D-01- 1

120 6 11/20/9 6
4.6 5 243 0

21 6 2 3 0. 4 B 13 7 0.4 8 1.7 9 2.2 7 e u 2 8 B 159 0 0.02 2 B 0.00 5 U

0.00 5 U 0. 3 0.1 1 47. 4 0.00 4 B 21 3 45. 6
2 U 2 U 2 U 11. 1 2 B 110 0 2 U 255 0 1 0 B AP1TMW1 S

L 1 1808-0 1 M-AP1TMW 1 5-01- 1 189 8 11/18/9 6
6.6 1 82 6

12 6 8 0. 1 U 39. 8 0.0 1 U 2.2 8 2.2 8 2. 4 9. 1 36 0 0.01 6 B 0.00 5 U

0.001 U 0.000 8 B 0.0 1 U 0.0 3 B 0.000 2 U 0.52 3 0.0 5
9 0 9 0 2 U 1. 6 2 B 47 9 2 U 64 0 2 8 Dat a validatio n not full y complete ; dat a qualifier s ma y b e added

, modifie d or delete d upon completio n o f the dat a validatio n process

. U = no t detecte d a t th e indicate d metho d detectio n limit (MDL ) B = Analyt e concentratio n detecte d at a valu e betwee n the MD L and the practica l quantitatio n limit (PQL ) J = estimate d valu e N R = no t reporte d J:\5344\96SAMP\NOV96DAT.WB 2 Pag e 2 o f 3 McCulley

, Fric k & Oilman

, Inc

. M~-~ h 1 0 1OO7DRAF T TABL E 1 OPERABL E UNI T 7 • APACH E TAILING S GROUNDWATE R SAMPLIN G RESULT S NOVEMBE R 199 6 SAMPL E LOCATIO N L A B NUMBER SAMPL E NUMBE R SAMPLE DAT E Fiel d Parameter * p H (units ) Conductivit y @25 C (umhos/cm ) Majo r Constituent s an d Inorganic s Calciu m (mg/L ) Chlorid e (mg/L ) Fluorid e (mg/L ) Magnesiu m (mg/L ) Nitrit e as N (mg/L ) Nitrat e a s N (mg/L ) Nitrate/Nitrit e a s N (mg/L ) Potassiu m (mg/L ) Sodiu m (mg/L ) Sulfat e (mg/L ) Phosphorus

, dissolve d (mg/L ) Phosphorus

, orth o dissolve d (mg/L ) Metals

, Dissolve d Arseni c (mg/L ) Cadmiu m (mg/L ) Coppe r (mg/L ) Iro n (mg/L ) Lea d (mg/L ) Manganes e (mg/L ) Zin c (mg/L ) Other Wate r Qualit y Parameters Tota l Alkalinit y (mg/L ) Bicarbonat e a s CaCO 3 (mg/L ) Carbonat e as CaC0 3 (mg/L ) Cation-Anio n Balanc e (% ) Dissolve d Organi c Carbo n (DOC ) (mg/L ) Hardnes s a s CaC0 3 (mg/L ) Hydroxid e a s CaCO 3 (mg/L ) Residue

, Filterabl e (IDS ) (mg/L ) Residue

, Non-Filterabl e (TSS ) (mg/L ) AP1TMW16 S L11845-1 7 M-APITMW16S-01-1120 S 11/20/9 6

6.1 1 509 0

39 0 7 0. 2 B 40 0 0.0 2 B 0.0 2 U 0.0 2 U 1 4 1 9 4280 0.03 5 0.01 5 B

0.0 1 B 0.04 1 0.0 3 U 51 3 0.23 4 26 5 19 7

4 1 4 1 2 U 7. 7 3 B 262 0 2 U 622 0 3 0 AP1TMW16 D

L11845-1 8 M-AP1TMW16D-O M

120 6 11/20/9 8
6.2 1 3130
29 0 5 0. 1 U 23 4 0.0 2 B 0.0 2 U 0.0 2 U 1 0 1 2 213 0 0.02 1 B 0.00 7 B

0.0 1 1 B 0.00 8 0.0 2 U 220 0.01 9 12 2 9 2
2 7 2 7 2 U 12. 1 2 B 169 0 2 U 347 0 3 0 NW-1 6

L 1 1819-0 3 M-NW16-OI-111W 6 11/19/9 6
6.0 7 185 0
33 6 1 3 0. 1 U 74. 4 0.0 1 U 1.7 3 1.7 3 2. 1 41. 3 108 0 0.00 9 B 0.00 6 B

0.00 5 U 0.00 2 B 0.0 1 U 0.0 1 U 0.00 3 B 0.02 4 B 0.0 8
5 0 5 0 2 U 1. 2 2 B 115 0 2 U 170 0 1 2 B N W

S L 1 1845-2 2 M-NW3-01-112O9 9 11/20/9 6

8.1 9 26 4

3 0 5 0. 1 U 11. 7 0.0 1 U 1.7 8 1.7 8 1. 1 5. 5 J 10 B 0.02 4 B 0.00 7 B

0.00 1 U 0.000 2 U 0.0 1 U 0.0 5 U 0.000 2 U 0.00 5 U 0.0 1 U

10 5 10 5 2 U 2. 9 1 B 12 3 2 U 15 0 1 2 B W5

A L 1 1766-0 4 L-W&M11-M111 2 11/12/9 6
6.6 4 302 8
47 3 0. 5 U 0. 1 U 28 5 0.0 1 U 1.1 1 1.1 1 3.0 2 B 5.7 6 278 0 N R 0.00 6 B

0. 1 U 1. 5 0. 1 U 0.017 B 0.0 2 U 1.1 9 16 5
2 5 2 5 2 U -5. 7 1 B 235 0 2 U 353 0 19 8 W S

C L 1 1766-0 5 L-WSC-01-M111 2 11/12/9 6
7.6 1 210 2

36 0 1. 2 B 0. 1 U 17 1 0 0 1 U 0.7 8 0.7 8 2.1 5 B 6.3 4 134 0 N R 0.00 5 B

2 0 U 0.00 8 0.0 3 B 0.0 1 U 0.00 4 U 0.00 5 U 1.6 3
10 5 10 5 2 U 3. 3 2 B 160 0 2 U 211 0 S B ws o L 1 1766-0 2 L-W5D-01-M111 2 11/12/9 6

7.5 0 106 0

16 0 1. 7 B 0, 1 U 69 4 0.0 1 u 0.6 7 0.6 7 1.5 2 B 5.8 4 49 5 N R 0.00 7 B

0.0 1 U 0.00 2 U 0.0 1 B 0.0 1 U 0.00 2 U 0.00 5 U 0.0 1 U

15 5 15 5 2 U 1 4 1 B 68 5 2 U 89 0 5 U Dat a validatio n not full y complete ; dat a qualifier s ma y b e added

, modifie d or delete d upon completio n o f the dat a validatio n process

. U = no t detecte d a t th e indicate d metho d detectio n limi t (MDL ) B = Analyt e concentratio n detecte d a t a valu e betwee n th e MD L an d th e practical quanlitatlo n limi t (POL ) J = estimate d valu e N R = no t reporte d J:\5344\96SAMP\NOV96DAT.WB 2 Pag e 3 o f 3 McCulley

, Frick & Oilman

, Inc

.

. 199 7DRAF T TABL E 2 OPERABL E UNI T 7 • APACH E TAILING S SURFAC E WATE R SAMPLIN G RESULT S NOVEMBER 1996 SAMPL E LOCATIO N APUP

3 L A B NUMBE R L1 1

845-0 5 SAMPL E NUMBE R M-CGAO«-01- 1

12298 SAMPL E DAT E 11/22/9 6 Fiel d Ftow(cfs) pH (units ) Conductivit y @25 C (umhos/cni ) Majo r Constituent s an d Inorganic s Calciu m (mg/L ) Chlorid e (mg/L ) Fluorid e (mg/L ) Magnesiu m (mg/L ) Nitrit e a s N (mg/L ) Nitrat e a s N (mg/L ) Nitrate/Nitrit e a s N (mg/L ) Potassiu m (mg/L ) Sodiu m (mg/L ) Sulfat e (mg/L ) Phosphorus

, dissolve d (mg/L ) Phosphorus

, orth o dissolve d (mg/L ) Metals

, Dissolve d Arseni c (mg/L ) Cadmiu m (mg/L ) Coppe r (mg/L ) Iro n (mg/L ) Lea d (mg/L ) Manganes e (mg/L ) Zin c (mg/L ) Metals

, Tota l Arseni c (mg/L ) Cadmiu m (mg/L ) Coppe r (mg/L ) Iro n (mg/L ) Lea d (mg/L ) Manganes e (mg/L ) Zin c (mg/L ) Othe r Wate r Qualit y Parameters Tota l Alkalinit y (mg/L ) Bicarbonat e a s CaCO 3 (mg/L ) Carbonat e a s CaC0 3 (mg/L ) Cafon-Anfo n Balanc e (% ) Dissolved Organi c Carbo n (DOC ) (mg/L ) Hardnes s as CaC0 3 (mg/L ) Hydroxid e as CaCO 3 (mg/L ) Residue

, Filterabl e (TDS ) (mg/L ) Residue

, Non-Filterabl e (TSS ) (mg/L ) 0.9 6 7.1 9 115 0
19 S 1. 1 B 0. 4 B 48. 2 0.0 1 B 0.2 7 0.2 8 2. 2 3. 8 61 4 0.00 7 B 0.00 5 U

0.00 5 U 0.00 9 0.0 1 U 02 0.00 2 B 0.49 6 1.7 6
0.00 5 U 0.00 7 0.0 1 U 1.0 3 0.08 2 0.50 7 1. 8
1 2 1 2 2 U 3 1 B 68 6 2 U 90 0 5 U SPR2 6 L 1 1863-0 3 M-SPR2SO1-11239 8 11/23/9 6
0.0 1 7.5 1 261 0
43 3 2. 9 0.2 B 17 9 0.0 1 U 1. 3 1. 3 2.5 8. 1 160 0 0.00 5 U 0.00 5 U J

0.00 5 U 0.29 3 0.0 2 U 0.11 0.15 5 1.2 5 51. 5
0.00 5 U 0.2 9 0.0 2 U 0.0 7 B 0.16 8 1.1 7 49.2

14 1 14 1 2 U 2.5 1 B 1820 2 U 246 0 1 2 B SPR2 5 L11863-1 0 M-SPR2W1- 1 1239 6 11/23/9 6
0.0 3 7.4 0 2980

45 4 2.5 0. 1 B 20 5 0.0 1 U 0.8 8 0.8 8 3. 7 7. 6 187 0 0.0 1 S B 0.00 5 U J

0.0 1 U 0.70 6 0.0 3 B 0.1 6 0.28 1 5.5 8 15 7
0.0 1 U 0.70 4 0.0 2 B 0.9 4 0.6 3 4.4 6 13 4

11 0 11 0 2 U 4. 2 2 B 1980 2 U 2930 2 0 SPR2 4 L 1 1863-06 I*SPR244>1- 1 1239 8 11/23/9 6
0.1 1 7.5 5 173 1
24 2 J 1. 7 B 0.2 B 10 2 0.0 1 U 0.2 3 0.2 3 2. 4 7. 4 89 0 0.00 5 U 0.00 5 U J

0.00 2 U 0.11 5 0.0 1 U 0.0 1 U 0.011 1 0.08 3 J 25. 4 •

0.00 2 U 0.11 4 0.0 1 U 0.0 1 B 0.014 7 0.08 8 22. 9

16 0 16 0 21 1 0. 7 U 1 U 102 0 2 U 145 0 2 0 APUP

2 L 1 1845-0 3 M-CGAOM1- 1 1229 8 11/22/9 6
0.9 3 6.2 8 116 0
19 5 1. 1 B 0. 4 B 49. 3 0.0 1 U 0.2 6 0.2 6 2. 1 3. 8 61 0 0.00 5 U 0.00 5 U

0.00 5 U 0.00 9 0.0 1 U 0.2 1 0.00 1 B 0.55 6 1.9 6
0.00 5 U 0.00 8 0.0 1 U 0.3 3 0.01 4 0.54 3 1.9 4

1 2 1 2 2 U 3. 7 1 B 69 0 2 U 91 0 5 U SPR24 B L 1 1863-0 9 M-SPR24B-01- 1 1239 6 11/23/9 6
0.0 3 7.9 7 137 4
223 J 1. 1 B 0. 3 B 59. 8 0.0 1 U 0.2 1 0.2 1 2 4. 6 69 0 0.00 5 U 0.00 5 U J

0.0 1 U 0.04 9 0.0 1 B 0.0 2 B 0.01 3 0.50 5 10. 6
0.00 2 U 0.04 7 0.0 1 B 0.0 5 0.017 0.42 7 9.1 3

4 9 4 9 2 U 3. 5 1 U 80 3 2 U 111 0 2 8 Dat a validatio n no t full y complete ; dat a qualifier s ma y be added

, modifie d o r delete d upo n completio n o f th e dat a validatio n process

. cf s = cubi c fee t pe r secon d N M = not measured ; flo w too lo w t o measur e U = not detecte d at the indicate d metho d detectio n limi t (MDL ) B

= Anatyt e concentratio n detecte d at a valu e betwee n the MD L and the practica l quantitatio n limi t (PQL ) J

= estimate d valu e NR

= no t reporte d

J:\5344\96SAMP\NOV96DAT.WB 2 Page l o f 4 McCulley

, Fric k & Oilman

, Inc

. Marc h 12,199 7DRAF T •TABL E 2 OPERABL E UNI T 7 • APACH E TAILING S SURFAC E WATE R SAMPLIN G RESULT S NOVEMBER 1996 SAMPL E LOCATIO N APU

P L A B NUMBE R L

1 1845-0 2 SAMPL E NUMBE R HMDUP-OI-IIB M SAMPLE DAT E 11/22/9 6 Fiel d Flo w (cfs ) p H (units ) Conductivit y @25 C (umhos/cm ) Majo r Constituent * an d Inorganic s Calciu m (mg/L ) Chlorid e (mg/L ) Fluorid e (mg/L ) Magnesium (mg/L ) Nitrit e a s N (mg/L ) Nitrat e a s N (mg/L ) Nitrate/Nitrit e as N (mg/L ) Potassiu m (mg/L ) Sodiu m (mg/L ) Sulfat e (mg/L ) Phosphorus

, dissolve d (mg/L ) Phosphorus

, orth o dissolve d (mg/L ) Metals

, Dissolve d Arseni c (mg/L ) Cadmiu m (mg/L ) Coppe r (mg/L ) Iro n (mg/L ) Lea d (mg/L ) Manganes e (mg/L ) Zin c (mg/L ) Metals

, Tota l Aiseni c (mg/L ) Cadmiu m (mg/L ) Coppe r (mg/L ) Iro n (mg/L ) Lea d (mg/L ) Manganes e (mg/L ) Zinc (mg/L ) Othe r Wate r Qualit y Parameter s Tota l Alkalinit y (mg/L ) Bicarbonat e a s CaCO 3 (mg/L ) Carbonat e a s CaCO 3 (mg/L ) Cation-Anio n Balanc e (% ) Dissolve d Organi c Carbo n (DOC ) (mg/L ) Hardnes s as CaC0 3 (mg/L ) Hydroxid e a s CaCO 3 (mg/L ) Residue

, Filterabl e (TDS ) (mg/L ) Residue

, Non-Filterabl e (TSS ) (mg/L ) 0.2 0 6.5 9 116 0
19 6 1 B 0. 4 B 50. 1 0.0 1 U 0.2 6 0.2 6 2. 3 4 60 4 0.00 9 B 0.00 5 U

0.00 5 U 0.00 9 0.0 1 U 0.1 5 0.00 1 U 0.5 7

. 1.9 1

0.00 5 U 0.00 8 0.0 1 U 0.2 4 0.00 9 0.55 1 1. 9
1 2 1 2 2 U 4.6 1 U 69 6 2 U 91 0 5 U APDN

1 L11845-0 1 IMPON1-01.11229 A 11/22/9 6
1.2 9 6,7 7 115 0
19 4 I B 0. 4 B 48. 9 0.0 1 U 0.2 5 0.2 5 2. 2 3. 9 63 0 0.00 6 B 0.00 5 U

0.00 5 U 0.00 7 0.0 1 U 0.1 2 0.00 1 U 0. 4 1.4 8

0.00 5 U 0.00 6 0.0 1 U 0.8 3 0.07 1 0.41 5 1.5 4

1 1 1 1 2 U 1. 8 1 B 68 6 2 U 89 0 6 B SPR2 3 L 1 1863-0 1 M-SPR23-O M 1239 8 11/23/9 6
0.1 9 7.9 9 86 4
10 6 4. 5 0. 1 U 49. 6 0.0 1 U 0.4 6 0.4 6 1. 4 5 26 3 0.00 7 B 0.02 2 B J

0.00 2 U 0.000 4 U 0.0 1 B 0.0 1 U 0.000 4 U 0.00 5 U 0.0 5
0.00 2 U 0.000 4 U 0.0 1 U 0.0 1 U 0.000 5 B 0.00 5 B 0.0 9
16 3 16 3 2 U 3. 7 1 B 46 9 2 U 62 0 5 U APU

1 L 1 1845-2 5 iyMPUI-01- 1 12198 11/21/9 6
1.7 7 6.9 0 55 0
67. 8 1.4 8 0. 1 U 28.8 0.0 1 U 0.1 7 0.1 7 1. 1 2. 5 17 0 0.02 1 B 0.00 7 B

0.00 5 U 0.03 1 0.0 1 U 0.0 1 U 0.00 5 B 0.19 9 5.0 7
0.00 5 U 0.02 9 0.0 1 U 0.1 7 0.01 7 0.21 3 5. 4

9 8 9 8 2 U 4. 1 1 U 28 8 2 U 36 0 5 U APD 1 L 1 1845-2 3 M-APOi-oi-mis e 11/21/9 6
2.2 6 7.5 0 56 0
69. 2 1. 7 B 0. 1 U 26. 5 0.0 1 U 0.1 5 0.1 5 0.9 B 2. 6 17 5 0.01 7 B 0.00 5 U

0.00 1 U 0.002 9 0.0 1 B 0.0 1 U 0.004 8 0.2 1 5.0 3
0.00 2 U 0.029 5 0.0 1 U 0.3 1 0.032 1 0.23 2 5. 4

9 7 9 7 2 U 2. 3 1 U 28 2 2 U 37 0 6 B APDN

2 L 1 1845- 1 3 M4MA044M1219 8 11/21/9 6
3.8 9 7.3 0 81 9
12 7 1. 4 B 0. 3 B 38. 5 0.0 1 U 0.2 2 0.2 2 1. 3 3. 2 40 5 0.0 1 B 0.00 5 U

0.00 5 U 0.01 9 0.0 1 U 0.0 7 0.00 2 B 0.42 5 3.6 6
0.00 5 U 0.01 7 0.0 1 U 0.3 8 0.03 2 0.41 1 3.5 4

5 2 5 2 2 U 1. 1 1 B 47 6 2 U 66 0 2 2 Dat a validatio n not full y complete ; dat a qualifier s ma y b e added

, modifie d or delete d upon completio n o f the dat a validatio n process

. cf s ~ cubi c fee t pe r secon d N M = not measured ; flo w too low t o measur e U = no t detecte d a t th e indicate d method detectio n limi t (MDL ) B

= Analyt e concentration detecte d a t a valu e betwee n th e MD L and th e practica l quantitatio n limi t (PQL ) J

= estimate d valu e NR

= no t reporte d

J:\5344\96SAMP\NOV96DAT.WB 2 Pag e 2 o f 4 McCulley

. Fric k & Oilman

, Inc

. Marc h 12,199 7DRAF T TABL E 2 OPERABL E UNI T 7 - APACH E TAILING S SURFAC E WATE R SAMPLIN G RESULT S NOVEMBE R 199 6 SAMPL E LOCATIO N SPR 9 L A B NUMBE R L

1 1863-1 1 SAMPL E NUMBE R M-SPRM1-11239 S SAMPLE DAT E 11/23/9 6 Fiel d Flo w (cfs ) pH (units ) Conductivit y @25 C (umhos/cm ) Majo r Constituent s and Inorganic s Calciu m (mg/L ) Chlorid e (mg/L )' Fluorid e (mg/L ) Magnesium (mg/L ) Nitrit e a s N (mg/L ) Nitrat e a s N (mg/L ) Nitrate/Nitrit e as N (mg/L ) Potassiu m (mg/L ) Sodiu m (mg/L ) Sutfat e (mg/L ) Phosphorus

, dissolve d (mg/L ) Phosphorus

, orth o dissolve d (mg/L ) Metals

, Dissolve d Arseni c (mg/L ) Cadmiu m (mg/L ) Coppe r (mg/L ) Iro n (mg/L ) Lea d (mg/L ) Manganese (mg/L ) Zin c (mg/L ) Metals

, Tota l Arseni c (mg/L ) Cadmium (mg/L ) Coppe r (mg/L ) Iro n (mg/L ) Lea d (mg/L ) Manganes e (mg/L ) Zin c (mg/L ) Othe r Wate r Qualit y Parameter s Tota l Alkalinit y (mg/L ) Bicarbonat e a s CaC0 3 (mg/L ) Carbonat e a s CaCO 3 (mg/L ) Cation-Anio n Balanc e (% ) Dissolve d Organi c Carbon (DOC ) (mg/L ) Hardnes s as CaCO 3 (mg/L ) Hydroxid e a s CaC03 (mg/L ) Residue

, Filterabl e (TDS ) (mg/L ) Residue

. Non-Filterabl e (TSS ) (mg/L ) N M 5.6 3 261 0
27 4 2. 9 0. 2 B 20 6 0.0 1 B 0. 3 0.3 1 5. 1 8. 4 163 0 0.04 5 0.01 2 B J

0.0 1 U 0.03 4 0.0 4 B 4 3 0.02 7 55. 4 71. 5

0.00 5 U 0.03 2 0.0 2 B 43. 2 0.07 4 5 4 69. 8 S B S B 2 U 7 2 B 1530 2 U 254 0 18 B SPR2 1 L11883-1 3 M-SPR21-01- 1 1239 6 11/23/9 6 N M 6.2 4 235 0
194. 0 2. 5 0. 1 U 162. 0 0.0 4 B 0.0 2 U 0.0 3 B 7. 1 8. 5 1520 0.015 6 0.00 6 B J

0.0 1 U 0.03 5 0.0 2 U 105. 0 0.05 7 77. 9 70. 2
0.00 5 U 0.03 2 0.0 2 U 102. 0 0.11 0 75. 3 67.9

1 5 1 5 2 U 6. 8 2 B 115 0 2 U 217 0 5 6 CG0 3 L 1 1845-1 2 M-CGOM1- 1 1219 8 11/21/9 6
2.2 7 7.2 8 82 6
131 1. 4 B 0. 3 B 40. 3 0.0 1 U 0.1 9 0.1 9 1. 6 3.3 42 4 0.01 3 B 0.00 5 U

0.00 5 U 0.01 9 0.0 1 U 0.6 1 0.00 1 U 0.97 5 4.2 3

0.00 5 U 0.01 8 0.0 1 U 1 0.02 7 0.931 4.1 1

5 0 5 0 2 U 1. 5 1 B 49 3 2 U 64 0 5 U SPR 7 L 1 1863-0 2 M-SPR7-OM123 W 11/23/9 6

0.0 5 3.2 4 636 0
40 6 11. 6 0. 1 U 39 8 0.0 1 U 0.0 3 B 0.0 3 B 5 1 3 714 0 0.05 2 0.05 5 J

0.0 2 U 0.20 7 0.2 8 B 119 0 0.77 6 37 1 24 7

0.0 1 U 0.17 1 0. 1 U 111 0 0.71 8 32 3 23 0

2 U 2 U 2 U 0. 4 3 B 265 0 2 U 895 0 6 2 SPR 8 L 1 1863-0 5 M-SPR8-01-11239 S 11/23/9 6

0.0 1 3.1 7 170 5
22 7 3 0. 2 B 97. 1 0.0 1 U 0.0 2 U 0.0 2 U 2.5 5. 4 135 0 0.00 5 U 0.00 6 B J

0.00 5 U 0.05 8 0. 1 56. 2 0.39 4 60.8 46. 5

0.00 5 U 0.05 6 0.0 7 5 3 0.39 1 52. 5 42. 8

2 U 2 U 2 U 0. 1 2 8 96 7 2 U 1740 6 B CGA01 U L 1 1845-1 1 M-CGA01U-01-1121S

6 11/21/9 6
3.3 2 7.3 3 95 4
13 7 1. 5 B 0. 3 B 45. 9 0.0 1 B 0.2 1 0.2 2 1. 5 3. 4 51 6 0.01 1 B 0.00 5 U

0.00 5 U 0.0 2 0.0 1 U 16. 9 0.00 1 U 6.1 7 7.7 4
0.00 5 U 0.0 2 0.0 1 U 17. 1 0.05 3 5.7 6 7.4 6

1 8 1 8 2 U 4. 7 1 8 53 1 2 U 76 0 3 6 Dat a validatio n not full y complete ; dat a qualifier s ma y b e added

, modifie d o r delete d upon completio n o f the dat a validatio n process

. cf s = cubi c fee t pe r secon d N M = no t measured ; flo w to o lo w t o measur e U = no t detecte d a t th e indicate d metho d detectio n limi t (MDL ) B

= Anatyt e concentratio n detecte d at a valu e betwee n the MD L and the practica l quantitatio n limi t (PQL ) J

= estimate d valu e NR

= no t reporte d

J:\5344\96SAMP\NOV96DAT.WB 2 Pag e 3 o f 4 McCulley

, Pric k & Oilman

. Inc

. Marc h 12,199 7TABL E 2 OPERABL E UNI T 7 - APACH E TAILING S SURFAC E WATE R SAMPLIN G RESULT S NOVEMBE R 199 6 SAMPL E LOCATIO N CGA01 L L A B NUMBE R L

1 1845-1 0 SAMPLE NUMBER IMGAOIL-OI-IIJI

W SAMPLE DAT E 11/21/9 6 Fiel d Flo w (cfs ) p H (units ) Conductivit y @25 C (umhos/cm ) Majo r Constituent s an d Inorganic s Calciu m (mg/L ) Chlorid e (mg/L ) Fluoride(mg/L ) Magnesiu m (mg/L ) Nitrit e a s N (mg/L ) Nitrat e a s N (mg/L ) Nitrate/Nitrit e a s N (mg/L ) Potassiu m (mg/L ) Sodiu m (mg/L ) Sulfat e (mg/L )

. Phosphorus

, dissolve d (mg/L ) Phosphorus

, orth o dissolve d (mg/L ) Metals

, Dissolve d Arseni c (mg/L ) Cadmiu m (mg/L ) Coppe r (mg/L ) Iro n (mg/L ) Lea d (mg/L ) Manganes e (mg/L ) Zin c (mg/L ) Metals

, Tota l Arseni c (mg/L ) Cadmiu m (mg/L ) Coppe r (mg/L ) Iro n (mg/L ) Lea d (mg/L ) Manganese (mg/L ) Zin c (mg/L ) Othe r Wate r Qualit y Parameter s Tota l Alkalinit y (mg/L ) Bicarbonat e a s CaC0 3 (mg/L ) Carbonat e a s CaC0 3 (mg/L ) Cation-Anio n Balance (% ) Dissolve d Organi c Carbon (DOC ) (mg/L ) Hardnes s a s CaCO 3 (mg/L ) Hydroxid e a s CaC0 3 (mg/L ) Residue

, Filterabl e (TDS ) (mg/L ) Residue

, Non-Filterabl e (TSS ) (mg/L ) 3.3 2 7.0 2 86 2
12 9 1. 5 B 0.2 B 4 3 0.01 8 0.2 3 0.2 4 1. 6 3. 1 43 7 0.01 S B 0.00 5 U O.OO S U 0.02 4 0.0 1 U 12. 5 0.001 U 5.2 5 7.7 9 O.OO S U 0.02 4 0.0 1 B 14. 4 0.10 5 5.0 7 7.8 9

3 4 3 4 2 U 7. 1 1 B 49 9 2 U 68 0 4 4 PD 1 L 1 1845-0 6 M-PD1-01- 1 1229 8 11/22/9 6
1.6 5 7.5 2 20 0
24. 7 0. 9 B 0. 1 B 11. 6 0.0 1 U 0.1 3 0.1 3 0. 7 B 1. 3 14. 9 0.00 5 B 0.00 6 B

0.00 5 U 0.00 2 B 0.01 U 0.01 U 0.001 U O.OO S U 0.0 2 B

0.00 5 U 0.00 1 U 0.0 1 U 0.0 1 B 0.00 1 u 0.00 5 U 0.0 5

8 9 8 9 2 U 2. 9 1 B 10 9 2 U 11 0 5 U SPR2

2 L 1 1845-0 7 M^PR22-Ot-1t22» 6 11/22/9 6 N M 6.9 6 33 6
42. 9 1. 5 B 0. 1 U 15. 6 0.0 1 U 0. 5 0. 5 1. 7 2. 1 6 1 0.00 9 B 0.00 5 U O.OO S U 0.00 2 B 0.01 U 0.01 U 0.001 U
• 0.00 6 B 0.0 3 B

0.00 5 U 0.00 1 U 0.0 1 U 0.0 9 0.00 3 B 0.02 3 B 0.1 3

9 7 9 7 2 U 3. 8 1 U 17 1 2 U 20 0 1 2 B CP

1 L 1 1863-0 7 VWJP 1 -01-112 3 9 » 11/23/9 6 N M 8.3 1 35 0
40. 2 1. 8 B 0. 1 U 16. 7 0.0 1 U 0.3 6 0.3 6 3.5 2.3 6 4 0.00 9 B 0.00 5 U J

0.001 U 0.000 3 B 0.01 B 0.01 U 0.000 2 U 0.00 9 B 0.0 7

0.00 2 U 0.000 4 U 0.0 1 U 0.1 7 0.00 2 0.02 6 B 0.1 3

9 6 9 6 2 U 3.4 1 B 16 9 2 U 23 0 5 U Dat a validatio n no t full y complete ; dat a qualifier s ma y be added

, modifie d o r delete d upo n completio n o f th e dat a validatio n process

. cf s = cubi c fee t pe r secon d N M = no t measured ; flo w too low t o measur e U = not detecte d at the indicate d metho d detectio n limi t (MDL ) B

= Analyt e concentratio n detecte d a t a valu e betwee n th e MD L an d th e practica l quantitatio n limi t (POL ) J

= estimate d valu e NR

= not reporte d

J:\5344\96SAMP\NOV96DAT.WB 2 Page 4 o f 4 McCulley

, Frick & Oilman

. Inc

. Marc h 12,199 7DRAF T TABL E 3 OPERABL E UNI T 7 - APACH E TAILING S SURFAC E WATE R AN D GROUNDWATE R SAMPLIN G RESULT S DECEMBE R 199 6 SAMPL E LOCATIO N L A B NUMBE R SAMPL E NUMBE R SAMPL E DAT E Fiel d Row(cfs ) p H (units )' Conductivit y @25 C (umhos/cm ) Majo r Constituent s an d Inorganic s Calciu m (mg/L ) Chlorid e (mg/L ) Fluorid e (mg/L ) Magnesiu m (mg/L ) Nitrit e a s N (mg/L ) Nitrat e a s N (mg/L ) Nitrate/Nitrit e as N (mg/L ) Potassiu m (mg/L ) Sodiu m (mg/L ) Sulfate (mg/L ) Phosphoru s dissolve d (mg/L ) Phosphorus

, orth o dissolve d (mg/L ) Metals

, Dissolve d Arseni c (mg/L ) Cadmiu m (mg/L ) Coppe r (mg/L ) Iro n (mg/L ) Lead (mg/L ) Manganes e (mg/L ) Zinc (mg/L ) Metals

, Tota l Arseni c (mg/L ) Cadmiu m (mg/L ) Coppe r (mg/L ) Iro n (mg/L ) Lea d (mg/L ) Manganes e (mg/L ) Zin c (mg/L ) Othe r Wate r Qualit y Parameters Tota l Alkalinit y (mg/L ) Bicarbonat e a s CaCO 3 (mg/L ) Carbonat e a s CaCO 3 (mg/L ) Cation-Anio n Balance(% ) Dissolve d Organi c Carbo n (DOC ) (mg/L ) Hardnes s as CaCO S (mg/L ) Hydroxid e a s CaCO S (mg/L ) Residue

, Filterabl e (IDS ) (mg/L ) Residue

, Non-Filterabl e (TSS ) (mg/L ) APD 1

L12135-0 1 M-APD1-01-12159 6 12/15/9 6

0.3 8 7.6 7 515
68. 5 1. 3 B 0. 1 U 26. 9 0.0 1 U 0.4 5 - 0.4 5 0. 6 B 2.3 15 8 0.0 1 6 6 0.00 5 U

0.00 2 U 0.022 7 0.0 1 U 0.0 1 U 0.003 9 0.18 9 4.3 6
0.00 2 B 0.021 5 0.0 1 U 0.2 7 0.025 4 0.17 7 4.0 2
10 2 10 2 2 U 4. 2 1 U 28 2 2 U 33 0 10 B APU

1 AP1TMW

3 L12135-0 2 L12145-0 1 M-APU1-01-12159 6

M-AP1TMW3-01-12179 6 12/15/9 6 12/17/9 6

0.43 8 7.1 1 62 4

63. 3 1. 3 B 0. 1 U 24. 2 0.0 1 U 0.4 8 0.4 8 0. 7 B 2. 1 14 5 0.00 5 B 0.00 5 U

0.00 2 U 0.021 5 0.0 1 U 0.0 1 U 0.005 2 0.181 3.8 5
0.00 2 U 0.020 2 0.0 1 U 0.0 9 0.013 4 0.16 1 3.6 5
9 7 9 7 2 U 3. 2 1 U 25 8 2 U 310 1 4 B N

M 5.5 0 44 1

58. 9 9.4 0. 1 U 22. 2 0.0 1 U 2.5 9 2.5 9 1. 2 4. 9 13 3 0.00 5 U 0.02 2 B

0.00 2 U 0.000 4 U 0.0 1 U 0.0 1 B 0.000 4 U 0.02 5 0.0 6 N R N R N R N R N R N R N R

6 9 6 9 2 U 4. 1 1 U 23 8 2 U 30 0 8 B Dat a validatio n no t full y complete ; dat a qualifier s ma y b e added

, modifie d o r delete d upo n completio n o f th e dat a validatio n process

. cf s - cubi c fee t pe r secon d N M

- no t measured N R * no t reporte d U

- analyt e no t detecte d a t th e indicate d metho d detectio n limi t (MDL ) B B analyt e concentratio n detecte d at a valu e between the MD L and practica l quantitatio n limi t J = estimate d valu e J:\5344\96SAMP\DEC96DAT.WB 2 Pag e 1 o f 1 McCulley

, Fric k & Gilman

, Inc

. Marc h 12,199 7MONITORIN G WEL L CONSTRUCTIO N SUMMAR Y APACH E TAILING S

Wel l Identificatio n AP1TMW 1 AP1TMW 2 AP1TMW 3 AP1TMW 7 APITMW 8 APITMW 9 AP1TMW1 0 AP1TMW11 S AP1TMW11 D AP1TMW12 S AP1TMW12 D AP1TMW13 S AP1TMW13 D AP1TMW14 S AP1TMW14 D APITMWI 5 AP1TMW16 S APITMW16 D N W S W 5 A NWS B W5C W 5 D N W S NW1 6 Dat

e
o f Installatio n 09/24/9 1 09/17/9 1 09/18/9 1 10/09/9 1 10/23/9 1 10/21/9 1 10/22/9 1 10/29/9 6 10/23/9 6 10/31/9 6 10/30/9 6 1 1/05/9 6 1 1/07/9 6 11/12/9 6 11/11/9 6 11/13/9 6 11/11/9 6 1 1/14/9 6 10/25/8 4 1 1/02/8 4 11/13/8 4 10/16/9 0 10/13/9 0 10/25/8 4 1 1/07/8 4 Locatio n
Northin g 513,898.7 6 513,779.7 2 513,660.8 3 513,917.8 3 513,951.5 6 513,968.9 1 513,704.7 4 513,946.6 3 513,936.7 0 513,979.4 8 513,974.8 5 513,629.6 9 513,640.82 514,403.1 9 514,405.9 8 514,056.3 7 513,9351 3 513,915.0 0 513,358.5 0 513,377.0 6 513,382.8 0 513,347.8 2 513,376.8 6 Eastin

g 1,775,525.8 7 1,775,709.2 9 1,775,414.1 3 1,777,822.9 4 1,776,525.3 5 1,776,843.2 5 1,776,993.7 2 1,776,544.0 ! 1,776,555.8 6 1,776,840.8 5 1,776,857.1 8 1,777,199.9 1 1,777,206.3 9 1,776,813.3 9 1,776,803.7 0 1,777,281.7 6 1,776,304.1 3 1,776,304.8 9 1,777,636.3 4 1,777,642.0 7 1,777,655.4 7 1,777,652.9 6 1,777,681.4 1 Elevatio n T o p o f PV C Casin g (ft ) 10,044.16 10,041.14 10,029.9 5 10,146.6 2 10,117.2 8 10,114.1 7 10,114.7 0 10,117.8 0 10,118.4 8 10,116.9 7 10,116.9 2 10,099.4 1 10,099.1 4 10,116.0 3 10,115.9 9 10,118.6 9 10,065.9 3 10,065.6 4 10,113.9 2 10,114.2 3 10,114.7 8 10,115.1 3 10,117.3 9 10,067.1 5 10,124.8 4 Approximat

e Groun d Surfac e (ft ) 10,041.8 0 10,039.69 10,029.1 0 10,144.95 10,115.4 5 10,112.8 3 10,112.7 0 10,115.8 0 10,116.4 8 10,114.9 7 10,114.9 2 10,097.4 1 10,097.1 4 10,114.0 3 10,113.9 9 10,116.6 9 10,063.9 3 10,063.6 4 10,111.9 2 10,112.2 3 10,112.7 8 10,113.1 3 10,115.3 9 10,065.6 5 10,123.9 6 Casin

g Diamete r (in ) 4 4 4 4 4 4 4 2 2 2 2 2 2 2 2 2 2 2 6 4 4 4 4 6 4 Wel

l Scree n Interva l Lengt h (ft ) 1 0 5 1 0 1 0 I S 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 5 1 0 1 0 5 6 0 2 0 4 0 6 0 4 0 5 0 4 0 Approximat e Dept h (ft ) 12.0-22. 0 9.0-14. 0 13.4-23. 4 62.2-72. 2 20.5-35. 5 9.3-19. 3 9.0-19 0 36.3-46. 3 54.8-64. 8 21.0-31. 0 38.8-48. 8 4.8-14. 8 29.0-39. 0 21.5-31. 5 47. 4 - 52. 4 19.0-29. 0 4.8-14, 8 13.0-18. 0 48.0-108. 0 15.0-35. 0 220.0-260. 0 48.0-108. 0 221.5-261. 5 26.0-76. 0 40. 0 - 80. 0 Approximat

e Elevatio n (ft ) 10,029.8-10,019. 8 10,030.7-10,025. 7 10,015.7-10,005. 7 10,082.8-10,072. 8 10,095.0-10,080. 0 10,103.5-10,093. 5 10,103.7-10,093. 7 10,079.5-10,069. 5 10,061.7-10,051. 7 10,094.0-10,084. 0 10,076.1-10,066. 1 10,092.6-10,082. 6 10,068.1-10,058. 1 10,092.5-10,082. 5 10,066.6-10,061. 6 10,097.7-10,087. 7 10,059.1-10,049. 1 10,050.6-10,045. 6 10,063.9-10,003. 9 10,097.2-10,077. 2 9,892.8-9,852. 8 10,065.1-10,005. 1 9,893.9-9,853. 9 10,039.7-9,989. 7 10,084.0-10,044. 0 San d

Pac k Interva l Lengt h (ft ) 14. 5 9. 5 15. 5 21. 5 2 1 1 4 1 3 1 4 12. 2 12. 5 1 6 11. 1 13. 1 12. 5 8 1 3 1 1 9 7 6 2 5 15 0 71. 5 55. 3 7 6 4 8 Approximat e Dept h (ft ) 9.0-23. 5 5.5-15. 0 9. 5 - 25. 0 56.0-77. 5 16.0-37. 0 6.0-20. 0 7.0-20. 0 33.0-47. 0 52.9-65. 1 18.5-31. 0 330-49. 0 4.0-15. 1 27.0-40 1 19.5-32. 0 45. 0 - 53. 0 16.5-29. 5 4.0-15. 0 11.0-20. 0 32.0-108. 0 10.0-35. 0 1 10. 0 - 260. 0 39.6-111. 1 208. 6 - 263. 9 20.0-96. 0 32.0-80. 0 Approximat

e Elevatio n (ft ) 10,032.8-10,018. 3 10,034.2-10,024. 7 10,019.6-10,004. 1 10,089.0-10,067. 5 10,099.5-10,078. 5 10,106.8-10,092. 8 10,105.7-10,092. 7 10,082.8-10,068. 8 10,063.6-10,051. 4 10,096. 5 - 10,084. 0 10,081.9

- 10,065. 9 10,093. 4 - 10,082. 6 10,070.1-10,057. 1 10,094.5-10,082. 0 10,069.0-10,061. 0 10,100.2-10,087. 2 10,059.9-10,048. 9 10,052.6-10,043. 6 10,079.9-10,003. 9 10,102.2-10,077. 2 10,002.8-9,852. 8 10,073.5-10,002. 0 9,906.79-9,851. 5 10,045. 7 - 9,969. 7 10,092.0-10,044. 0 Approximat

e Tota l Dept h o f Wel l Belo w To p o f PV C (ft ) 26 0 16. 3 25. 4 77. 6 38. 1 21. 8 21. 7 49. 1 67. 6 33. 4 51. 0 17. 4 41 6 34. 0 55. 1 31. 1 17. 5 20. 5 108. 0 35. 5 260. 0 110. 5 260. 0 92. 5 78. 8

J:\5344\WELLCNST.WB 2 03/13/9 72/9 7 D:\5344\5344-1.DW

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. 1 0 r770»-»1J 4 tatrnm KICTVM

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. hu i t r \n » JS&S,°?g!£> »TM*«»"« ^ a "o" —«

. - f SIT E PLA N SHOWIN G MONITORIN G LOCATION S PROJECT : 5344. 0 I DATE : FEBRUARY

, 199 7 REV : I

BY : SCG I CHECKED : DL L McCULLEY

. FRIC K & OILMAN

. INC

.INTERI M REMOVA L ACTION PLA N OPERABL E UNI T 7 - APACH E TAILING S IMPOUNDMENT

S Californi a Gulc h Superfun d Sit e 

### Leadville

, Colorad o

Apri l 3 , 199 7

Prepare d for : 

### ASARC O INCORPORATE D 49 5 East 51s t Avenu e Denver

, Colorad o 80216-209 3



### Prepare d by : 

### MCCULLEY

, FRIC K & OILMAN

, INC

. providin g environmental consultin g an d engineerin g service s 484 0 Pear l Eas t Circle

, Suit e 20C W Boulder

. Colorad o 8030 1 (303 ) 447-182 3 F A X 447-183 6TABL E O F CONTENT S

LIS T O F FIGURE S

.................................................... . i i

1. 0 INTRODUCTIO

N

............................................... . 1

2. 0 BACKGROUN

D

................................................. ]

3 . 0 CURREN T SIT E CONDITION S

4. 0 OBJECTIVE

S

.................................................. . 3

5 . 0 PROPOSE D INTERI M REMOVA L ACTION S

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

3 5. 1 REMOVA L O F TAILING S POND S 2 AN D 3

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

3 5. 2 EROSIO N PROTECTIO N

..................................... . 6

6 . 0 TENTATIV

E CONSTRUCTIO

N SCHEDUL E

............................. . 7

7. 0 REFERENCES

.................................................. . 8

J;U3«\JJiU-3\RAPLA

N DO C McCuIley

, Fric k & Oilman

, Inc

. Apri l 3 , 1997

xv?;-;-?

. >:o:'£. £ A: TLIS T O F FIGURE S

P i Q i ^ *• * T*

i f 1 • LJLjL*4A_ K

- 1 H.1 TM 1 Sit

e Pla n 2 Nov

.

199 6 - Preliminar y Surfac e Wate r Monitorin g Dat a 3 Cros

s Sectio n A-A 4 199 7

Interi m Remova l Actio n Pla n 5 Embankmen

t Protectio n Detail s

McCulley

,

Fric k & Oilman

. Inc

. 1 1 Apri l 3 , 199 71. 0 INTRODUCTIO

N Asarc o i s proposin g t o perfor m interi m remova l action s a t th e Apach e Tailing s Impoundments

, Operabl e Uni t 7 (OU-7 ) o f th e Californi a Gulc h Superfun d Sit e (the Site ) i n Leadville

, Colorado

. I n orde r t o complet e thes e action s i n 1997 , Asarc o i s proposin g t o undertak e thes e action s a s a Time-Critical Removal Action under CERCLA. Th e propose d interi m action s ar e intende d t o b e consisten t wit h an y propose d remed y evaluate d unde r th e revised Feasibilit y Stud y t o be complete d fo r th e Site

.
2. 0 BACKGROUN

D 

### Th e result s o f previou s investigation s relate d t o th e Apach e Tailing s Impoundment s ar e presente d 

### i n variou s report s includin g th e Tailing s Disposa l Are a Remedia l Investigatio n Repor t (1994)

, th e Hydrogeologi c Remedia l Investigatio n Report (1995)

, an d th e Surfac e Wate r Remedia l Investigatio n Repor t (1995)

. I n Januar y 1996 , a draf t Feasibilit y Stud y (FS ) wa s submitte d fo r th e Apach e Tailing s Impoundments

. Subsequen t t o th e submitta l o f th e draf t FS

, additiona l sit e investigatio n activitie s hav e bee n initiate d t o supplemen t th e previous investigations an d t o suppor t completio n o f th e FS

.

3 . 0 CURREN T SIT E CONDITION S Th e Apach e Tailing s Impoundmen t consist s o f a mai n tailing s impoundmen t an d tw o smalle r impoundment s locate d alon g Californi a Gulch

, approximatel y 1,50 0 fee t downstrea m o f th e Ya k Tunne l Wate r Treatmen t Plan t surg e pond

, a s illustrate d o n th e Sit e Pla n (Figur e 1)

. Th e mai n impoundmen t encompasses approximatel y 11. 3 acre s withi n an are a zone d for industria l us e b y th e Cit y o f Leadville

. Th e volum e o f tailing s i n th e mai n impoundment ha s bee n previousl y estimate d a t approximatel y 630,000 cubi c yards

. The embankmen t slope s on the nort h and eas t sid e o f the mai n impoundmen t rang e fro m 1.5: 1 (H:V ) t o 1.75: 1 an d reac h height s o f u p t o 1 5 feet

. Th e embankmen t slop e o n th e southwes t sid e

o f th e mai n impoundment approache s 1: 1 an d i s u p t o 5 0 fee t i n height

. Th e tw o smalle r impoundments

, Tailing s Pon d No

. 2 (TP2 ) an d Tailing s Pon d No

. 3 (TP3 ) ar e locate d wes t o f the mai n impoundmen t an d 

### directl y nort h and adjacen t t o wate r flowin g i n the gulch

, TP 2 i s locate d immediatel y wes t o f the mai n impoundmen t an d cover s a n are a o f approximatel y 1. 5 acres

. TP 3 i s locate d immediatel y wes t o f TP 2 an d

cover s a n are a o f .approximatel y 0. 5 acres

. Th e volume o f tailing s materia l i n TP 2 an d TP 3 hav e bee n

- : j344\sj*».3'.SAWAN.ixx :

McCulley

, Pric k & Oilman

. Inc

. 1 Apri l 3 , 1997

;r.:-:i ; L 6estimate d

previousl y a t approximatel y 8,50 0 and 3,80 0 cubi c yards

, respectively

. Impoundmen t berm s for 

### bot h pond s (at the sout h and wes t sides o f the impoundments ) appea r t o hav e bee n constructe d o f nativ e soi l materia l fro m Californi a Gulch

. Thes e berm s rang e fro m 1: 1 t o 1.5:1 , ar e approximatel y 1 0 fee t i n heigh t and ar e approximatel y 1 0 fee t wid e acros s the top

. 

### T h e majorit y o f surfac e water flo w i n Californi a Gulc h i s presentl y conveyed b y th e Californi a 

### Gulc h channe l locate d o n the sout h sid e o f the gulc h i n the vicinit y o f the Apach e Tailing s Impoundment

. The channe l intersect s the souther n edg e o f the mai n impoundmen t wher e the flo w i s carrie d b y tw o 24

- inc h diamete r clay-til e culvert s installe d beneat h a portio n o f th e impoundment

. Surfac e water flo w fro m 

### the are a immediatel y upstrea m (approximatel y 1,00 0 feet ) o f the mai n impoundmen t and belo w the 

### elevatio n o f th e constructed Californi a Gulch channe l ar e conveye d unde r th e mai n impoundment throug h wha t appear s t o b e a woode n bo x culvert

. After exitin g thes e culverts

, surfac e water flow s continu e t o the northwest

, wes t o f an d adjacen t t o th e southwes t embankmen t o f th e mai n impoundment

, fo r approximatel y 30 0 fee t befor e turnin g t o th e wes t an d continuin g dow n th e gulc h pas t th e lowe r impoundment s (TP 2 an d TP3)

. A fiel d investigatio n wa s conducte d i n Novembe r an d Decembe r 199 6 t o supplemen t th e existin g dat a presente d i n th e variou s Remedial Investigatio n report s an d draf t Feasibilit y S-:d y fo r th e Site

. Th e purpos e o f the supplementa l investigatio n wa s t o gathe r dat a t o enhanc e the evaluatio n o f the interactio n
o f surfac e water and groundwate r i n the immediat e vicinit y o f the Apach e Tailing s Impoundments

. A s part

o f thi s supplementa l fiel d investigation , 1 1 ne w groundwate r monitorin g well s wer e installe d a t th e Site

. Tw o round s o f groundwate r and surfac e wate r samplin g are planne d a t th e Sit e a s part o f th e supplementa l investigation ; on e samplin g even t t o coincid e wit h low-flo w conditions an d on e t o coincid e wit h high-flo w 

### conditions

. The firs t o f thes e event s wa s performe d i n Novembe r 1996 wit h the samplin g o f 1 8 groundwate r wells

, and surfac e wate r samplin g at 2 2 locations

. The locations o f the groundwate r monitorin g well s an d surfac e wate r samplin g location s ar e presente d o n Figur e 1

. Surfac e wate r flo w measurement s wer e obtaine d a t 2 1 locations

. Selecte d dat a fro m thi s Novembe r 199 6 even t ar e presente d

o n th e attache d Figur e 2, entitle d Nov

. 199 6 - Preliminar y Surfac e Wate r Monitorin g Data

. Figur e 3 

### present s a cros s sectio n (Cros s Sectio n A-A indicate d o n th e Sit e Plan ) take n throug h th e lower impoundment s an d extendin g throug h th e mai n impoundment nea r th e location s o f monitorin g wel l cluster s AP1TMW1 1 an d AP1TMW12

. McCulley

. Fric k & Oilman

, Inc

. Apri l 3

. 199 74. 0 OBJECTIVE S Th e followin g objective s hav e bee n establishe d fo r implementatio n o f interi m remova l action s a t th e site :

* Reduc e th e potentia l fo r impact s th e tailing s impoundment s ma y hav e o n surfac e wate r an d groundwate r i n Californi a Gulch ; and

• Prepar e portions o f th e tailing s material

, primaril y throug h consolidatio n an d dewatering

, t o facilitat e th e timel y implementatio n o f futur e fina l remedial actions

. 5 . 0 PROPOSE D INTERI M REMOVA L ACTION S 

### Th e propose d interi m action s t o mee t th e objective s presente d abov e includ e remova l o f Tailing s Pond s 2 an d 3 (TP 2 an d TP3 ) an d consolidatio n o f thi s materia l o n th e mai n impoundment

, an d providin g erosio n protectio n alon g th e toe o f th e southwest embankmen t o f th e mai n impoundmen t below th e clay-til e culvert s and woode n bo x culver t outfalls

.
5. 1 REMOVA L O F TAILING S POND S 2 AN D 3 The remova l o f TP 2 an d TP 3 wil l involve the excavation o f the tailing s fro m thes e impoundments

, placemen t o f th e materia l o n th e mai n impoundment

, an d recontourin g th e remova l are a t o promot e drainag e (addin g clea n fil l as necessary)

. Th e propose d interi m remova l action wil l eliminat e potentia l contac t wit h groundwate r an d eliminat e futur e contact wit h surfac e wate r i n Californi a Gulch

. Spreadin g 

### th e excavated materia l o n th e mai n impoundmen t wil l promot e drainag e an d dryin g o f th e tailing s materia l

an d improv e thei r handlin g characteristic s an d trafficabiliry

, whic h wil l facilitat e a futur e fina l remedy

. The tailing s i n TP 2 and TP 3 generall y consis t o f yellow

, orange, orangis h brow n and blac k sil t and fine-graine d san d tailings

, an d appea r t o contai n abundan t pyrite

. Thre e subsurfac e tailing s sample s (tw o 

### fro m TP 2 an d on e fro m TP3)

, an d tw o sample s o f th e underlyin g soi l (on e fro m beneat h eac h impoundment ) wer e collecte d durin g th e Tailing s Disposa l Area s Remedia l Investigatio n (Asarco

, 1994)

. A summar y o f the tota l metal s concentrations o f thes e sample s i s presente d i n Tabl e 3-1 0 o f the Tailing s R I Repor t (Asarco

, 1994)

. A s indicate d i n thi s table

, th e sample s o f tailing s fro m TP 2 exhibi t lead J:\5344\33u-j\KAPLAN.DO C

McCulley

, Fric k & Oilman

. Inc

. 3 Apri l 3.199 7concentration s

o f 1,93 0 mg/kg ( 4 - 5' ) an d 7,41 0 mg/k g (8. 8 - 9.8' ) an d zin c concentrations o f 6,70 0 mg/k g ( 4 - 5' ) an d 15,40 0 mg/k g (8. 8 - 9.8')

. Th e sampl e o f tailing s fro m TP 3 ( 4 - 5' ) exhibit s a lea d 

### concentratio n o f 2,68 0 mg/k g an d a zin c concentratio n o f 4,030 mg/kg

. The two sample s o f underlyin g (foundation ) soil s exhibi t lea d concentration s o f 69 4 mg/k g (TP3 ) an d 2,06 0 mg/k g (TP2 ) an d zin c concentration s o f 99 2 mg/kg (TP2 ) an d 1,60 0 mg/k g (TP3)

. Th e impoundmen t berm s fo r bot h TP 2 an d TP 3 appea r t o hav e bee n constructe d o f native soi l material

. 

### Surfac e wate r that currentl y i s ponde d o n TP 2 and TP 3 wil l b e removed prio r t o initiatin g excavatio n b y pumpin g the water t o the existin g pon d on the mai n impoundment for ultimat e transfe r t o the Ya k Tunne l Wate r Treatmen t Plan t (WTP)

, o r b y transportin g i t t o the WT P usin g tanker trucks

. A s indicate d o n th e cros s section , th e bas e o f TP 2 an d TP 3 ma y currentl y b e nea r o r belo w th e groundwate r 

### tabl e i n thi s are a and

, therefore

, dewaterin g durin g excavatio n ma y b e required

. Wate r remove d durin g excavatio n wil l b e pumpe d t o th e existin g pon d o n th e mai n impoundment

. Al l tailing s an d a six

- t o twelve-inc h laye r o f underlyin g native soi l wil l b e excavated an d removed

, 

### th e tailing/nativ e soi l interface

, bot h verticall y an d horizontally

, wil l b e determine d b y visua l observation s durin g excavation

. Excavatio n activities wil l begi n a t th e lower impoundment ber m o f eac h impoundment

an d procee d towar d th e northeast

. A sum p wil l b e create d nea r th e ber m an d an y groundwate r encountere d 

### durin g excavatio n wil l b e pumpe d fro m thi s sum p t o th e mai n impoundment t o maintai n wate r level s belo w the botto m o f the excavatio n t o the exten t practicable

. This method o f excavatio n shoul d produc e condition s conduciv e t o a visua l determinatio n o f tailing s removal

. Followin g complet e remova l o f al l visuall y identifiabl e tailing s an d impacte d subgrad e soils

, confirmatio n sample s o f th e nativ e underlyin g soi l wil l b e obtained

. Fou r gra b sample s representativ e o f the nativ e soi l underlyin g TP 2 and two gra b sample s representativ e o f th e nativ e soi l underlyin g TP 3 wil l b e collecte d an d analyze d for total lea d an d 

### zinc, b y fiel d X-Ra y Fluorescenc e (XRF ) o r appropriat e we t chemistr y method s (e.g.

, TC P analysis)

. Th e result s o f thes e analyse s wil l b e use d t o furthe r documen t th e metal s concentration s i n th e underlyin g nativ e soils

. Th e materia l i n th e impoundmen t berm s wil l als o be sample d t o determin e it' s suitabilit y fo r us e as backfil l material

. Although th e interi m actio n level s fo r lea d i n soil s i n a commercia l o r industrial settin g

are i n th e rang e o f 6,10 0 t o 7,70 0 mg.kg

, onl y materia l wit h lea d concentration s belo w 3,50 0 mg/k g wil l 

### b e use d t o backfil l th e excavation s an d recontour th e area
. Impoundmen t ber m materia l foun d t o contai n greate r tha n 3,50 0 mg/kg lea d wil l b e place d o n th e mai n impoundment

. Monitorin g wel l AP2TMW 1

c McCulley

, Pric k & Oilman

, Inc

. 4 Apri l 3 , 199 7locate d

i n TP2

, whic h ha s bee n dr y an d i s no t bein g sample d a s pa n o f th e supplementa l investigation , wil l b e remove d durin g excavation

. Following excavation , regradin g and/o r limite d backfil l placemen t wil l be performe d i n th e remova l

area s t o creat e a fina l groun d surfac e abov e th e groundwate r tabl e whic h wil l promot e surfac e drainag e

an d preven t ponding

. Materia l fro m th e impoundmen t berm s wit h lea d concentrations les s tha n 3,50 0 mg/k g wil l b e use d a s fil l materia l and wil l b e supplemente d wit h impor t fill

, a s necessary, fro m eithe r the Oregon Gulc h o r Hecl a borrow areas

. Regrading/recontourin

g wil l b e performe d t o maintai n curren t surfac e wate r flo w condition s i n Californi a Gulch

. Th e propose d approximat e fina l contour s ar e show n

o n Figur e 4

. Othe r reclamatio n activities , suc h a s soi l amendment o r revegetation , wil l no t b e performe d unti l th e fina l remed y fo r thi s are a o f OU 7 i s selected

. Potentiall y contaminate d surfac e wate r run-of f fro m th e mai n impoundmen t wil l b e directe d throug h th e are a between TP 2 an d th e mai n impoundmen t t o a sedimen t control structur e a s indicate d o n Figur e 4

. Th e sediment control structur e wil l consis t o f a n earthen ber m wit h a ha y bal e cor e an d a roc k



### o r ripra p line d discharg e notc h intende d t o intercep t and retai n sedimen t i n stormwate r runoff

. This structur e wil l b e maintaine d unti l the fina l remed y i s implemented

. Diversio n o f uncontaminate d surfac e run-of f alon g th e nort h sid e o f th e mai n impoundment wil l also b e maintained o r upgrade d t o minimiz e potentia l contac t wit h tailing s materia l o r other potentiall y contaminate d flows

. Durin g th e excavation , on-sit e transport , an d placemen t o f tailing s material

, appropriat e engineerin g control s wil l b e maintaine d t o contro l stormwate r runof f an d dus t generation

. Sil t fence

, o r other temporar y sediment contro l devices

, wil l b e installe d a t th e bas e o f th e impoundmen t berm s t o intercep t an d retai n sedimen : i n st c .nwate r runof f fro m TP 2 an d TP 3 durin g constructio n activities

. Whil e dus t contro l wil l no t likel y b e required i n th e excavatio n area , dust contro l o n th e hau l rout e wil l b e maintaine d throug h wate r application

, a s necessary

. Th e excavated tailing s wil l b e transporte d t o th e mai n impoundmen t usin g th e temporar y roa d fro m the wes t sid e o f the impoundmen t nea r the ol d foundation s t o the new wel l installation s nea r the cente r o f the impoundmen t (AP1TMW12 ) an d place d o n the nort h sid e o f thi s road

, a s indicate d o n Figur e 4 , I t i s expecte d tha t placemen t ma y b e achieve d utilizin g lo w groun d pressur e equipmen t withou t th e us e o f J:\5344\5J4t-JVRAftAN.DO C

McCulley

, Fric k & Oilman

, Inc

. 5 Apri l 3 , 1997geotextii e

c r geosyntheti c subgrad e support

. Severa l settlemen t plate s wil l be installe d i n th e fil l placemen t

are a t o monitor th e settlement/consolidatio n

o f th e underlyin g tailing s as a resul t o f loadin g fro m th e fill

. Wate r ponde d o n th e mai n impoundmen t wil l b e transferre d t o th e Surg e Pon d a t th e WTP

, Thi s wate r wil l b e pumpe d fro m the existin g sum p are a nea r the southwes t corne r o f the existin g pon d an d conveye d t o th e Surg e Pon d vi a th e existin g hig h densit y polyethylen e pipeline

. Alternatively

, prio r t o th e 

### initiatio n o f excavatio n activitie s at TP 2 and TP3

, water ma y b e transferre d t o TP 2 and transporte d t o the treatmen t plan t usin g tanke r trucks

. Th e remova l o f thi s water i s intende d t o reduc e th e potentia l fo r infiltratio n o f ponde d water throug h th e mai n impoundmen t an d t o hel p prepar e th e tailing s fo r fina l 

### remedia l actions

.

5 . 2 EROSIO N PROTECTIO N Th e Californi a Gulch channe l currentl y follow s th e embankmen t o f th e mai n impoundmen t (flowin g i n a northwesterl y direction ) fo r approximatel y 30 0 fee t fro m th e clay-til e culvert outfal l befor e turnin g t o the wes t and flowin g awa y fro m the impoundment

. Erosio n o f nativ e soi l underlyin g tailing s a t the bas e

o f thi s embankmen t i s eviden t alon g thi s 300-foo t reach

. Activitie s involvin g the protectio n o f the to e o f thi s embankmen t ar e propose d t o minimiz e furthe r erosion, sedimen t loadin g and potentia l surfac e wate r contact wit h th e tailings

. Thes e activitie s wil l involv e th e limite d excavatio n o f tailing s a t th e kno b whic h extend s towar d th e channel approximatel y 10 0 fee t belo w th e clay-tii e culvert outfalls

, an d th e placemen t o f clea n fil l and/o r ripra p fo r erosio n protectio n a t th e to e o f th e embankment

. Currently

, th e upstrea m fac e (sout h side ) o f thi s kno b i s nearl y vertical

. Thi s conditio n i s unstabl e an d ther e i s evidenc e that

, throug h erosio n


### an d undercuttin g o f th e underlyin g nativ e soil

, tailing s materia l ha s sloughe d of f o f thi s knob

. Excavatio n

o f thi s kno b woul d b e performe d t o creat e a mor e stabl e surfac e wit h a maximu m slop e o f 2H:IV

. Excavate d materia l wil l b e place d directl y i n the erosion channe l or slop e failur e are a i n the mai n impoundmen t embankmen t immediatel y t o th e nort h o f th e kno b a s show n o n Figur e 5 , an d compacte d usin g non-vibrator y compactio n equipment

. Thi s placemen t locatio n eliminate s th e nee d t o hau l materia l fro m th e are a an d shoul d provid e additiona l stabilit y t o th e mai n impoundmen t embankment

. Erosion protectio n o f the to e o f the embankmen t fro m the upstrea m edg e o f the kno b t o the poin t wher e the channe l McCullcy

. Fric k & Oilman

, Inc

. Apri l 3 , 1997turn s awa y fro m the mai n impoundmen t wil l b e provide d throug h the placemen t o f ripra p tw o t o thre e vertica l fee t u p th e to e o f th e embankment

. 

### T o facilitate thes e activitie s an d provid e acces s t o th e wor k area, flo w i n th e channe l belo w th e kno b wil l b e diverted

, o r moved

, approximatel y 1 0 fee t t o th e wes t o f th e embankment

, an d a ram p wil l 

### b e constructe d t o provid e acces s for a smal l trac k excavato r t o th e to p o f th e knob

, a s indicate d on Figur e 5

. Sil t fenc e and/o r hay-bale s wil l b e place d at the bas e o f the kno b durin g excavatio n t o reduce the potentia l fo r excavate d materia l fallin g int o th e channel

, I t i s anticipate d that short-ter m increase s i n sedimen t loadin g ma y b e observed durin g constructio n activitie s i n and aroun d the channel

. Severa l sil t 

### fence/hay-bal e chec k dam s wil l b e installe d acros s the channe l i n the vicinit y o f the lowe r impoundment s t o provid e sedimen t contro l durin g construction

. A cultura l resourc e investigatio n o f th e Apach e Tailing s Are a wa s conducte d i n Augus t 1995 , an d



### a sit e wit h potentia l archaeologica l significanc e wa s identified

. This sit e i s locate d immediatel y wes t o f Californi a Gulch belo w the culver t outfall s o n the southwes t sid e o f the ma m impoundment

, a s outline d

o n Figur e 5

. Th e sit e contain s structural remain s an d artifac t scatte r an d wa s recommended a s individuall y eligibl e fo r nomination t o th e Nationa l Registe r o f Histori c Places an d contributin g t o th e Leadvill e Minin g Distric t (Asarco

, 1995)

. Th e sit e wil l b e protected

, a s necessary, an d avoide d durin g th e performanc e o f

wor k i n thi s area
.
6 . 0 TENTATIV

E CONSTRUCTIO N

SCHEDUL E Th e propose d schedul e fo r th e implementatio n o f interi m action s i s a s follows : Remova l o f Ponde d Wate r fro m TP2 ( TP 3
an d Mai n Impoundmen t 

### Erosio n Protectio n (S W embankmen t toe ) Remova l o f TP 2 an d TP 3 June-Jul y

'9 7 April-Ma y '9 7 August-Septembe r '9 7

J :\3344V S W*.3\RAPLAN

. DO C McCulley

, Pric k & Oilman

, Inc

. Apri l 3 , 19977. 0

REFERENCE

S
Asar=o

. 1994

. Tailing s Disposa l Are a Remedial Investigatio n Report

, Californi a Gulc h Site

, Lesdvilie

, Colorado

. Prepare d b y Woodward-Clyd e Consultants

. January

. Asarco

, 1995

. Cultura l Resource s Investigation s o f th e Apach e Tailing s Ares

, Operabl e Uni t 7

. Californi a Guich Superftin d Site

, Leadvills

. Colorado

. Prepare d b y Foothil l Engineerin g Consultants

, Inc.

, November

.

McCulley

,

Frick & Oilman

. Inc

. April 3 , 199 7UNITE D STATE S ENVIRONMENTA L

PROTECTIO N AGENC Y REGIO N VII I 9 9 9 18t h STREET-SUIT

E 50 0 DENVER

, COLORAD O 80202-24B 6 

### Ref : 8EPR-S R 

## CONCURRENC E ACTIO N MEMORANDUM 

### DATE : April?

, 199 7 

### SUBJECT : Reques t fo r Removal (Response ) Actio n a t th e Californi a Gulc h Nationa l Prioritie s Lis t Site

, Leadville

, Colorado : ACTIO N MEMORANDU M fo r a Time

- Critica l Removal Actio n fo r Removal o f Tailing s Pon d No

. 2 an d Tailing s Pon d No

. 3 o f th e Apach e Tailing s Impoundmen t (Operabl e Uni t 7 ) FROM : Mik e Holmes

, 8EPR-S R T O : Ma x H

. Dodso n Assistan t Regiona l Administrato r 

### Offic e o f Ecosystems Protectio n an d Remediatio n Fina l NP L Site I D # 2 9 CERCLI S I D # COD98071793 8 

### Categor y o f Removal : Time-Critica l I

. Purpos e / <



### - 

### Thi s Actio n Memorandu m document s th e Agency' s selectio n an d implementatio n o f th e tim e critica l remova l (response ) actio n describe d herei n fo r th e Apach e Tailing s Impoundments/a n

are a contaminate d wit h metal-lade n tailing s fro m histori c minin g an d millin g operations

. Th e Apach e Tailing s Impoundmen t are a 

### comprise s a smal l portio n o f th e Superfun d RI/F S Stud y Are a o f th e Californi a Gulc h Superfun d Site

, locate d i n th e Leadvill e minin g distric t o f Lak e County

, 

### Colorado

. T h e Tim e Critica l Remova l Actio n a t th e Apach e Tailing s Impoundment s is consisten t wit h the remedia l activitie s whic h wil l b e undertake n b y EP A at O U 7

. Fina l remedia l alternative s fo r al l area s o f O U 7 wil l b e evaluate d in th e Feasibilit y Stud y (FS ) an d Recor d o f Decisio n (ROD ) fo r OU7

. Th e RO D fo r O U 7 wil l



### ^ Cultimatel y specif y thos e remedia l actions , beyon d thos e respons e action s ^implemente d pursuan t t o thi s Actio n Memorandurryiar e

required

. Th e F S wil l

J/Q-'<H~ 7 

## p 

# .

, „ ld p Printed on Recycled PaperUNITE D STATE S ENVIRONMENTA L

PROTECTIO N AGENC Y REGIO N VIII 9 9 9 18t h STREE T -SUIT E 50 0 DENVER

, COLORAD O 80202-246 6 

### Ref : 8EPR-S R CONCURRENCE ACTIO N MEMORANDU M 

### DATE : April?

, 199 7 

### SUBJECT : Reques t fo r Remova l (Response ) Actio n a t th e Californi a Gulc h Nationa l Prioritie s Lis t Site

, Leadville

, Colorado : ACTIO N MEMORANDU M fo r a Time

- Critica l Remova l Actio n fo r Removal o f Tailing s Pon d No

. 2 an d Tailing s Pon d No

. 3 o f th e Apach e Tailing s Impoundmen t (Operabl e Uni t 7 ) FROM : Mik e Holmes

, 8EPR-S R 

### T O : Ma x H

. Dodso n Assistan t Regiona l Administrato r 

### Offic e o f Ecosystem s Protectio n and Remediatio n Fina l NP L Sit e I D # 29

. CERCLI S I D # COD98071793 8 

### Category o f Removal : Time-Critica l I

. Purpos e 

### Thi s Actio n Memorandu m document s th e Agency' s selectio n an d implementatio n 

### o f th e tim e critica l remova l (response ) actio n describe d herei n fo r th e Apach e 

### Tailing s Impoundments

, a n are a contaminate d wit h metal-lade n tailing s fro m histori c minin g an d millin g operations

. Th e Apach e Tailing s Impoundmen t are a comprise s a smal l portio n o f th e Superfun d RI/F S Stud y Are a o f th e Californi a Gulc h Superfun d Site

, locate d i n th e Leadvill e minin g distric t o f Lak e County

, Colorado

. T h e Tim e Critica l Remova l Actio n a t th e Apach e Tailing s Impoundment s i s consisten t wit h th e remedia l activitie s whic h wil l b e undertake n b y EP A a t O U 7

. Fina l remedia l alternative s fo r al l areas-o f O U 7 wil l b e evaluate d in th e Feasibilit y Stud y (FS ) an d Recor d o f Decisio n (ROD ) fo r OU7

. Th e RO D fo r O U 7 wil l 

### ultimatel y specif y thos e remedia l actions beyon d thos e respons e actions 

### implemente d pursuan t t o thi s Actio n Memorandu m tha t ar e required

. Th e F S wil l

Printed on Recycled Paper

### evaluat

e th e effectivenes s o f a remed y t o stabiliz e th e tailing s i n plac e o r i f th e mai n 

### impoundmen t wil l nee d t o b e relocate d ou t o f th e Californi a Gulc h floo d plain

. Th e primar y goa l o f thi s Remova l Actio n i s t o preven t exposur e t o huma n population s 

### fro m tailing s washe d int o Californi a Gulc h an d degradatio n o f downstrea m wate r quality

. Thi s remova l actio n wil l als o reduc e th e leachin g an d migratio n o f metal s fro m th e tailing s int o surfac e an d groun d water s durin g stor m event s whic h occu r prio r t o implemtatio n o f remedia l actio n unde r the l RO D fo r OU7

. Regardles s o f t h e remed y selecte d b y th e ROD

, th e respons e action s take n unde r thi s Actio n Memorandu m wil l allo w fo r th e consolidatio n int o a smalle r are a an d th e dryin g ou t
o f th e tailings

. 

### Remedia l actio n objective s wer e identifie d i n th e Fina l Screenin g Feasibilit y Stud y f o r Remediatio n Alternative s a t th e Californi a Gulc h NP L Site

, Leadville

, Colorad o (SFS)

, (EPA

, 1993a)

. Consisten t wit h th e SFS

, remova l actio n objective s fo r th e 

### Apach e Tailing s Impoundment s are : O Contro l wate r erosio n o f tailing s materia l fro m th e sourc e location s O Contro l leachin g an d migratio n o f metal s fro m tailing s int o surfac e water 

### O Contro l leachin g an d migratio n o f metal s fro m tailing s int o groundwate r 

### Remova l alternative s t o directl y remediat e surfac e wate r o r groun d wate r i n th e 

### vicinit y o f th e Apach e Tailings Impoundment s hav e no t bee n evaluated

, an d wil l be addresse d unde r Operabl e Unit 12

. I I

. Californi a Gulc h
- Sit e Condition s an d Backgroun d T h e Californi a Gulc h Sit e was liste d o n th e Nationa l Prioritie s Lis t o n Septembe r 8 , 1983

. Th e Sit e i s i n a minin g are a coverin g 1 6 Y
2 

### squar e mile s o f a watershe d tha t drain s alon g Californi a Gulc h t o th e Arkansa s River

. Startin g in 1859 , th e are a wa s 

### mine d extensivel y fo r gold

, lead

, silver

, copper , zinc , an d manganese

. Californi a Gulc h collect s runof f tha t drain s numerou s abandone d mine s an d waste s fro m mining , millin g an d smelting

. Miner s buil t th e Ya k Tunne l t o drai n wate r fro m th e 

### min e working s an d t o mak e minera l exploratio n an d developmen t easier

. Thi s tunne l drain s hundred s o f mile s o f min e working s i n it s 4-mil e undergroun d cours e an d discharge s approximatel y 21 0 ton s o f metal s eac h yea r int o Californi a Gulch

. 

### Seventy-fiv e know n mill s dumpe d tailing s int o 5- 6 mile s o f drainages

. Si x impounde d tailing s dump s surround th e Cit y o f Leadville

. Man y smelters

, whic h ar e 

### locate d aroun d th e city , processe d silver

, lea d an d zin c a t various times

. Heav y meta l residue s are presen t i n muc h o f the City

. The Arkansas Rive r whic h receive s wate r fro m th e Californi a Gulch

, ha s bee n classifie d a s a recreationa l resource , an d

Printed on Recycled Paper

### i

s use d heavil y fo r irrigation , livestoc k watering , publi c wate r supplie s an d fisheries

. Approximatel y 4,000 liv e i n nearb y Leadvill e an d Lak e Count y (Se e Sit e Locatio n 

### Map

- Figur e 1 ) Apach e Tailing s Impoundment s A

. Backgroun d 

### T h e Apach e Tailing s Impoundmen t consist s o f a main tailing s impoundmen t
a n d two , smalle r impoundments

, locate d alon g Californi a Gulch

, approximatel y 1,50 0 fee t downstrea m o f th e Ya k Tunne l Wate r Treatmen t 

### Plan t Surg e Pond

, a s illustrate d o n th e attache d Sit e Plan

. Th e mai n 

### impoundmen t encompasse s approximatel y 11. 3 acres

. Th e volum e o f tailing s in th e mai n impoundmen t ha s bee n previousl y estimate d a t approximatel y 630,00 0 cubi c yards

. Th e embankmen t slope s o n th e nort h

an d eas t sid e o f th e mai n impoundmen t rang e fro m 1.5: 1 (H:V ) t o 1.75: 1 an d

reac h height s u p t o 1 5 feet

. Th e embankmen t slop e o n th e southwes t sid e 

### o f th e mai n impoundmen t approache s 1: 1 an d i s u p t o 5 0 fee t i n height

. Th e t w o smalle r impoundments

, TP 2 an d TP 3 ar e locate d wes t o f th e mai n impoundmen t an d directl y nort h an d adjacen t t o wate r flowin g in th e gulch

. 

### T P 2 i s locate d immediatel y wes t o f th e mai n impoundmen t an d cover s a n are a o f approximatel y 1. 5 acres

. TP 3 i s locate d immediatel y wes t o f TP 2


### an d cover s a n are a o f 0. 5 acres

. Th e volum e o f tailing s i n TP 2 an d TP 3 have bee n estimate d previousl y a t approximatel y 8,50 0 an d 3,90 0 cubi c 

### yards

, respectively

. Impoundmen t berm s fo r bot h pond s appea r t o hav e 

### bee n constructe d o f nativ e soi l materia l fro m Californi a Gulch

. Thes e berm s rang e fro m 1: 1 t o 1.5:1 , ar e approximatel y 1 0 fee t i n heigh t an d 1 0 fee t wid e acros s th e top

. 

### T h e majorit y o f surfac e water flo w i n Californi a Gulc h is presentl y conveye d 

### b y th e Californi a Gulc h channe l locate d o n th e sout h sid e o f th e gulc h in th e vicinit y o f th e Apach e Tailing s Impoundment

. Th e channe l intersect s th e souther n edg e o f the mai n impoundmen t wher e the flo w i s carrie d b y two 24

- 

### inc h diamete r clay-til e culvert s installe d beneat h a portio n o f th e mai n impoundment

. Surfac e wate r flo w fro m th e are a immediatel y upstrea m (approximatel y 1,00 0 feet ) o f th e mai n impoundmen t an d belo w th e elevatio n o f th e constructe d Californi a Gulc h channe l ar e conveye d unde r th e mai n impoundmen t throug h wha t appear s t o b e a woode n bo x culvert

. Afte r exitin g thes e culverts

, surfac e wate r continue s t o flo w t o th e northwest

, wes t
o f an d adjacen t t o th e southwes t embankmen t o f th e main impoundment

, fo r 

### approximatel y 30 0 fee t befor e turnin g t o th e wes t an d continuin g dow n th e gulc h pas t th e lowe r impoundment s (TP 2 an d TP3)

.

Printed

on Recycled Paper

### A

fiel d investigatio n was conducte d i n Novembe r an d Decembe r 199 6 t o supplemen t th e existin g dat a presente d i n th e Remedia l Investigatio n an d 

### Feasibilit y Stud y fo r th e site

. Th e purpos e o f thi s investigatio n wa s t o gathe r dat a t o enhanc e th e evaluatio n o f th e interactio n o f surfac e water an d groundwate r i n th e immediat e vicinit y o f th e Apach e Tailing s Impoundments

. A s par t o f thi s 

### supplementa l fiel d investigation , 1 1 ne w groundwate r monitorin g well s wer e 

### installe d a t th e site

. Tw o round s o f groundwate r an d surfac e wate r samplin g wer e planne d a t th e sit e a s par t o f th e supplementa l investigation ; on e samplin g even t
was performe d in Novembe r 199 6 t o coincid e wit h low-flo w condition s a t th e sit e 

### involve d th e samplin g o f 1 8 groundwate r wells

, an d surfac e wate r samplin g a t 2 2 

### locations

. Additiona l detail s ar e provide d i n th e Interi m Remova l Actio n Plan

, Operabl e Uni t 7 , Ca l Gulc h Superfun d Site

, date d Apri l 3 , 199 7 an d a lette r date d Marc h 13 , 199 7 whic h transmit s th e monitorin g dat a fo r th e samplin g even t 

### describe d above

. Bot h thes e document s ar e attache d t o thi s Actio n Memorandum

. B

. Sit e Characterizatio n - Apach e Tailing s Impoundmen t T h e result s o f previou s investigation s relate d t o th e Apach e Tailing s 

### Impoundmen t ar e presente d i n various report s includin g th e Tailing s 

### Disposa l Are a Remedia l Investigatio n Report

, Californi a Gulc h Site

, 

### Leadville

, Colorado

, Januar y 1994 , th e Hydrogeologi c Remedia l Investigatio n Repor t (1995)

, an d th e Surfac e Wate r Remedia l Investigatio n Repor t (1995)

. I n Januar y 1996 , a Draf t Feasibilit y Stud y (FS ) wa s 

### submitte d fo r th e Apach e Tailing s Impoundments

. Subsequen t t o th e submitta l o f th e draf t FS

, additiona l sit e investigatio n activitie s hav e bee n initiate d t o supplemen t th e previou s investigation s an d t o suppor t completio n oftheFS

. 

### T h e principa l concern s specificall y addresse d b y thi s Remova l Actio n are : * Impact s th e tailing s impoundment s ma y hav e o n surfac e wate r an d 

### groundwate r qualit y i n Californi a Gulch ; an d

* Preparatio n o f th e tailing s material

, primaril y throug h consolidatio n a n d dewatering

, t o facilitat e th e timel y implementatio n o f future

, fina l 

### respons e actions

. 

### * A lette r repor t date d Marc h 13, 199 7 whic h summarize s groundwate r qualit y dat a fro m samplin g event s performe d i n th e are a o f th e Apach e Tailing s Impoundments

, during Novembe r an d December

, 1996 , i s attached

.

Printed on Recycled Paper

### C

. Othe r Action s t o Dat e * A Tim e Critica l Remova l Actio n wa s performe d b y EP A o n th e Apach e 

### Energ y an d Mineral s Propert y whic h i s include d in Operabl e Uni t 7

. T h e actio n involve d removal o f drum s an d bags o f pyrit e an d 

### decontaminatio n an d demolitio n o f building s an d equipment

. Thi s Remova l Actio n wa s addresse d in a separat e Actio n Memorandu m date d Augus t 6 , 1996

. 

### * Durin g th e summe r an d fal l o f 1995 , ASARC O installe d approximatel y 

### 6 horizonta l drai n pipe s t o passivel y drai n wate r fro m th e mai n impoundment

. Th e demonstratio n projec t prove d ineffectiv e i n 

### drainin g th e tailing s an d wa s abandoned

. Ove r th e pas t severa l year s ASARC O ha s monitore d wate r level s o n to p o f th e main impoundmen t an d TP s 2 an d 3 an d a s needed

, th e ponde d wate r ha s bee n transferre d t o th e Yak Treatmen t plan t t o preven t catastrophi c releas e o f th e metal-lade n wate r int o Californi a gulch

. D

. Stat e an d Loca l Authorities Role s A cultura l resourc e investigatio n o f th e Apach e Tailing s Are a wa s conducte d in 1995 , an d a sit e wit h potentia l archaeologica l significanc e wa s identified

. 

### Thi s sit e contain s structura l remain s an d artifac t scatte r an d i s locate d immediatel y sout h o f Californi a Gulc h belo w th e culver t outfall s o n th e southwes t sid e o f th e mai n impoundment

. Th e propose d alignmen t o f th e 

### diversio n ditc h wil l no t impac t thi s are a an d additiona l investigatio n o r researc h o n thi s cultura l resource sit e ma y b e necessary , prio r t o 

### implementing th e fina l actions

. Th e initia l focu s o f thi s remova l actio n is t o 

### avoi d an y impact s o n th e are a o f archaeologica l significance

. I V

. Threat s t o Publi c Healt h o r Welfar e o r th e Environmen t A Fina l Baselin e Aquati c Ecolog y Risk Assessmen t (FBAERA)

, Californi a Gulch

, Leadville

, Colorad o (Ro y F

. Weston

, Inc. ) identifie s th e Site-wid e impac t o f min e 

### wast e contaminatio n o n th e terrestria l an d aquati c ecosystem s a t th e Site

. Th e 

### FBAER A provide s a conceptua l mode l o f Site-wid e exposur e fo r aquati c receptors

. Thi s Time-Critica l Removal Actio n is necessitate d b y th e threa t t o publi c health

, welfar e and/o r th e environmen t pose d b y th e direc t contact , inhalation

, an d ingestio n exposur e routes t o hazardou s substances

. Th e Actio n wil l als o reduc e 

### release s o f metal s t o th e surfac e an d groundwater

.

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### V

. Endangermen t Determinatio n 

### Actua l and/o r threatene d release s o f hazardou s substance s fro m th e Apach e Tailing s Impoundments

, i f no t addresse d b y implementin g th e remova l actio n 

### selecte d i n thi s Actio n Memorandum

, present s endangermen t t o publi c health

, o r welfare

, o r th e environment

. Th e publi c an d environmen t wil l continue d t o b e expose d t o th e releas e o f significan t quantitie s o f contaminate d materials

. V I

. Propose d Actions/Schedul e A

. Propose d Action s 

### 1

. Th e propose d interi m action s ar e describe d i n th e Interi m Remova l Actio n 

### Plan

, Operabl e Uni t 7 , Apach e Tailing s Impoundments

, Californi a Gulc h Superfun d Site

, date d Apri l 3 , 1997

. A cop y o f thi s repor t i s attached

. Th e 

### propose d interi m action s includ e th e following : 1. 1 Remova l o f T P 2 an d TP 3 an d consolidatio n o f th e materia l o n 

### t h e mai n impoundmen t an d eithe r divertin g Californi a Gulc h



### awa y fro m th e southwes t embankmen t o f th e main impoundmen t belo w th e clay-til e culvert s an d woode n bo x culvert s outfalls

, o r providing erosio n protectio n alon g th e to e 

### o f th e tailing s embankmen t area
. T h e exten t o f tailings

, berm s materia l an d nativ e soil t o be remove d wil l b e determine d b y visua l observatio n durin g excavation

. Confirmatio n sample s o f th e underlyin g soil s wil l b e collecte d an d soil s exceedin g 3,50 0 pp m lea d wil l b e removed

. F o r thi s removal action , slop e stabilit y concern s wil l b e 

### addresse d throug h th e applicatio n o f Bes t Managemen t 

### Practice s (BMPs )


### 1 . 2 Surfac e water tha t i s currentl y ponde d o n TP 2 an d TP 3 wil l b e remove d prio r t o initiating excavatio n b y pumpin g th e wate r t o t h e existin g pon d o n th e mai n impoundmen t fo r ultimat e 

### transfe r t o th e Yak Tunne l Wate r Treatmen t Pla n (WTP)

, o r b y 

### transporting it t o th e WT P usin g tanke r trucks

. Th e base o f T P 2 an d TP 3 ma y currentl y b e belo w th e groundwate r tabl e in thi s are a and

, therefore

, dewaterin g durin g excavatio n ma y be required

. Wate r removed durin g excavatio n wil l b e pumpe d t o 

### t h e existin g pon d o n th e main impoundment

. Followin g 

### excavation , clea n fil l wil l b e place d t o restor e th e area,

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### promot e surfac e drainag e an d preven t ponding

. Propose d 

### approximat e fina l contour s ar e shown o n th e figur e entitle d 199 7 Propose d Interi m Action

. 

### 1 . 3 Th e excavate d tailing s wil l b e transporte d t o th e main impoundmen t usin g th e temporar y roa d fro m th e wes t sid e o f t h e impoundmen t nea r th e ol d foundation s t o th e ne w wel l 

### installation s nea r th e cente r o f th e impoundmen t (AP1TMW12 )

an d place d o n th e nort h sid e o f thi s road

, a s indicate d o n th e 

### 199 7 Propose d Interi m Actio n Figure

, attached

. I t is 

### anticipate d tha t placemen t ma y b e achieve d utilizin g lo w groun d pressur e equipmen t withou t th e us e o f geotextil e o r geosyntheti c subgrad e support

. Th e installatio n o f severa l settlemen t plate s i n th e fil l placemen t are a i s als o propose d t o monito r th e settlement/consolidatio n

o f th e underlying tailing s a s a result s o f loading fro m th e fill

. 

### 1 . 4 Potentiall y contaminate d surfac e run-of f fro m th e main impoundmen t wil l b e directe d throug h th e are a betwee n TP 2


### an d th e mai n impoundmen t t o a sedimen t contro l structur e a s indicate d o n Figur e 4

. Th e sedimen t contro l structur e wil l 

### consis t o f a n earthe n ber m wit h a ha y bal e cor e an d a roc k o r rip-ra p line d discharg e notc h intende d t o intercep t an d retai n sedimen t i n stor m wate r run-off

. Thi s structur e wil l b e maintaine d unti l th e fina l remed y i s implemented

. Diversio n o f uncontaminate d surfac e run-of f alon g th e nort h sid e o f th e mai n impoundmen t wil l als o b e maintaine d o r upgrade d t o minimiz e potentia l contac t wit h tailing s materia l o r othe r potentiall y contaminate d flows

. 

### 1 . 5 Th e followin g activitie s involvin g th e protectio n o f th e to e o f 

### t h e mai n impoundmen t embankmen t ar e proposed

. Thes e activitie s wil l includ e excavatio n o f tailings

, primaril y a t th e kno b whic h extend s towar d th e channe l approximatel y 10 0 fee t 

### belo w th e clay-til e culver t outfalls

, an d th e placemen t o f clea n fil l and/o r ripra p fo r erosio n protectio n a t th e to e o f th e 

### embankment

. B

. Applicabl e o r Relevan t an d 

### Appropriate Requirement s (ARARs ) T h e ARAR s liste d o n TABLE F. 1 AN D F. 2 wil l b e followe d t o th e exten t 

### practicable

. Copie s o f thes e Table s ar e attached

.

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### C

. Performanc e Standard s T h e ARAR s wer e me t throug h complianc e wit h 

### Performanc e Standards

. 

### 1

. Th e designe d an d constructe d respons e actio n include d provision s t o ensur e tha t ther e ar e n o visibl e emission s (dust ) durin g remova l activitie s a t t h e Apach e Tailing s Impoundments

. Dus t contro l o n th e hau l route , an d 

### othe r areas , wil l b e maintaine d throug h wate r application

, a s necessary

. 2

. Durin g th e excavation , on-sit e transport , a'n d placemen t o f tailing s material

, 

### appropriat e engineerin g control s wil l b e maintaine d t o contro l stor m wate r runof f an d dus t generation , sil t fences

, hay bale s and/o r othe r sedimen t contro l devices wil l b e use d t o intercep t an d retain sedimen t i n stor m wate r runof f (bot h fro m th e mai n impoundmen t an d TP2/TP3)

. Th e sedimen t contro l structure s wil l b e lef t in place

, a s necessar y followin g th e completio n o f excavatio n an d regradin g o f th e removal are a an d unti l vegetatio n i s establishe d an d th e are a i s stabilized

. Un-contaminate d

surfac e wate r wil l 

### b e diverte d awa y fro m th e tailing s t o minimiz e contac t wit h tailings

. 

### 3

. A long-ter m maintenanc e progra m ma y b e implemente d i f require d b y th e Fina l Recor d o f Decisio n fo r Operabl e Unit 7 (O U 7 ) t o ensur e th e long-ter m effectivenes s o f th e respons e action

. D

. Projec t Schedul e 

### April-May 199 7 - Californi a Gulc h Belo w th e Culvert s June-Jul y 199 7 - Remova l o f Ponde d Wate r fro m TP@

, TP 3


### a n d Mai n Impoundmen t August-Septembe r 199 7 - Remova l o f TP 2 an d TP 3 E

. Estimate d Cost s 

### Thi s respons e actio n is bein g conducte d b y ASARCO

, Inc

.

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### VII

. Expecte d Chang e i n th e Situatio n Shoul d Actio n B e Delaye d o r N o t Take n 

### I f thi s Time-Critica l removal actio n i s delayed

, o r no t taken

, exposur e o f th e publi c 

### and environmen t t o heav y metal s containe d i n the min e wast e locate d i n the Apach e Tailing s Impoundment s wil l continue

. Withou t thi s time-critica l response , releas e o f contaminate d tailing s int o Californi a Gulc h an d th e Arkansa s River wil l continu e t o contaminat e surfac e wate r an d groundwate r i n th e are a aroun d th e 

### Apach e Tailing s Impoundments

. VIII

. Outstanding Polic y Issue s A Recor d o f Decisio n wil l be issue d selectin g th e fina l remedia l actio n fo r Operabl e Uni t 7 (OU 7 ) o f thi s Site

. I X

. Enforcemen t 

### Thi s Time-Critica l Remova l Actio n wil l b e performe d b y ASARCO

, Inc

.

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### X

. Recommendatio n Thi s decisio n documen t represent s th e selecte d Time-Critica l removal actio n fo r th e Apach e Tailing s Impoundment s portio n o f O U 7 o f th e Californi a Gulc h Superfun d Site

, i n th e Cit y o f Leadville

, Count y o f Lake

, Stat e o f Colorado

. I t wa s develope d 

### in accordanc e wit h CERCLA

, a s amended

, an d i s no t inconsisten t wit h th e NCR

. Thi s decisio n i s based o n th e Administrativ e Recor d fo r th e Site

. Condition s a t th e Apach e Tailing s Impoundment s mee t th e NC R Sectio n 300.415(b)(2 ) criteri a fo r a removal an d I recommen d approva l o f th e remova l action

. APPROVA L



### M a x H

. Dodso n Assistan t Regiona l Administrato r Offic e o f Ecosystem s Protectio n a n d Remediatio n
DISAPPROVA L



### M a x H

. Dodso n 

### Assistan t Regiona l Administrato r Offic e o f Ecosystem s Protectio n an d Remediatio n

'°v Printed o n Recycled Paper 1 0ROUTIN G AN D TRANSMITTA L SU P TO : (Name

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D o f approvals

, concurrence's ^ clearances

, an d simila r action s \ y FROM : fName.org

. symbol, Agency/Post)

5041-10 2

* US

. GPO : 199 0 - 2G2-08 0 M

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. 7-76 )

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