CONCURRENC E COP Y 04263 1
UNITE D STATE S ENVIRONMENTA L

PROTECTIO N

AGENC Y REGIO N VIII 

# ADMINISTRATIV

E RECOR D 

# FIL E PLA N
I N TH E MATTE R OF : CALIFORNI A GULC H SUPERFUN D SITE , ASARC O INCORPORATED , RESPONDENT

. PROCEEDIN G UNDE R SECTIO N 106(a ) O F TH E COMPREHENSIV

E ENVIRONMENTA L

RESPONSE , COMPENSATION

, AN D LIABILIT Y ACT , A S AMENDED , ,4 2 U.S.C

. § 9606(a ) E P

A Docke t No

. CERCLA-VIII-91-^ f 13.1

ADMINISTRATIV

E ORDE R FO R CERTAI N REMEDIA L INVESTIGATIO N

STUDIE S TABL E OF CONTENT S I

. INTRODUCTIO N

...................................... . 4 I I

. JURISDICTIO N

...................................... . 4 III

. PARTIE S

BOUN D

..................................... . 4 I V

. DEFINITION S

....................................... . 4 V

. GENERA

L PROVISION

S

................................ . 5 V I

. FINDING

S O F FAC T

.................................. . 6 VII

. CONCLUSION

S O F LAW AN D DETERMINATION

S

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

7 VIII

. NOTIC E

T O STAT E

................................... . 8 I .

. PERFORMANC E O F WOR K

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

>

. . MODIFICATIO N O F WOR K PLAN S

........................ . 9X I

.

XII

. XIII

. XIV

. X V

. XVI

. XVII

. XVIII

. XIX

. X X

. XXI

. XXII

. XXIII

. XXIV

. XXV

. XXVI

. XXVII

. XXVIII

. XXIX

. XXX

. XXXI

. Appendi x A Exhibit 1

. Exhibit 2

. QUALIT Y ASSURANCE , SAMPLING, DAT A ANALYSIS , AN D AVAILABILIT Y

....................................... . 9 ACCES

S .."..........................................

. 1 1 PUBLI C COMMENT

, ADMINISTRATIV

E RECORD.............

.

1 2 REPORTIN

G REQUIREMENT

S

............................ . 1 3 SUBMISSION

S REQUIRIN

G AGENC Y APPROVA L

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

1 3 REMEDIA L PROJEC T MANAGER...........................

. 1 4 ASSURANC

E O F ABILIT Y T O COMPLET E WOR K

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

1 5 * CERTIFICATIO N

OF COMPLETION

, TERMINATIO N

.......... .

1 6 EMERGENC Y RESPONS E

................................ . 1 6 INSURANC

E AN D INDEMNIFICATION

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

1 7 DELA Y I N PERFORMANC

E

.............................. . 1 8 UNITED STATE S NO T LIABL E

.......................... . 1 9 ENFORCEMEN

T AND.RESERVATION S

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

1 9 ACCES S T O INFORMATIO

N

............................. . 2 0 RETENTIO

N O F RECORD S

................................ . 2 1 EFFECTIV

E DAT E

.................................... . 2 1 COMMUNITY

. RELATION

S

............................... . 2 1 MODIFICATIO N

...................................... . 2 1 OPPORTUNIT

Y T O CONFE R

............................. . 2 2 NOTIC E O F INTEN T T O COMPL Y

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

2 2 ORDE R

............................................. . 2 3 Change s t o Exhibit s 2 , 4, 5 , and 6

. Demographic s Wor k Plan

. 

### Fina l Samplin g Pla n fo r Samplin g an d Analysi s o f Lea d Occurrenc e Withi n an d Immediatel y Adjacen t t o 

### Residences

.Exhibi t

3

. Soi l Investigatio n

Wor k Plan

. Exhibit 4

. Min e Wast e Pil e Remedia l Investigatio n

Wor k Plan

. Exhibit 5

. Tailin g Disposa l Are a Remedia l Investigatio n

Wor k Plan

. 

### Exhibi t 6

. Surfac e Water , Be d Materia l an d Aquati c Ecosyste m 

### Dat a Collectio n Progra m Wor k Plan

.I

. INTRODUCTIO N 1

. Thi s Administrativ e

Order direct s Responden t t o perfor m 

### certai n studie s towar d th e eventua l completio n o f a Remedia l 

### Investigation/Feasibilit

y Stud y ("RI/FS"

) i n connectio n wit h th e Californi a Gulc h Superfun d Sit e nea r Leadvilie , Lak e County , Colorado

. I I

.

JURISDICTIO N 

### 2

. Thi s Orde r i s issue d unde r th e authorit y veste d i n th e 

### Presiden t o f th e Unite d State s b y sectio n 106(a ) o f th e Comprehensiv e Environmenta l

Response ) Compensation ,

an d Liabilit y Act , 4 2 U.S.C

. § 9606(a) , a s amende d b y th e Superfun d Amendment s a n d Reauthorizatio n

Ac t o f 1986, Pub.'L

. No

. 99-499 , 10 0 Stat

. 16.1 3 (1986) (CERCLA)

.

Thi s authorit y wa s delegate d t o th e 

### Administrato r o f EP A o n January 23 , 1987 , b y Executiv e Orde r 12,580 , 52 Fed

. Reg

. 2,92 6 (1987) , an d furthe r delegate d t o Regiona l Administrator s

o n Septembe r 13 , 1987 , b y EP A Delegatio n 

### N o

. 14-14-C

. Thi s authorit y ha s bee n furthe r delegate d t o th e Directo r o f th e Hazardou s Wast e Managemen t Division

. III

. PARTIE S BOUN D 3

. Thi s Orde r shal l appl y t o an d be bindin g upo n Respondent , it s agents , successors ,

an d assigns

. Responden t i s 

### responsibl e fo r carryin g ou t al l actions require d o f i t b y this Order

. N o chang e i n the ownershi p or corporat e or othe r lega l 

### statu s o f Responden t o r o> £ the

. facilit y o r sit e shal l alte r Respondent' s responsibilitie s

under this Order

. • 

### 4

. Durin g th e perio d i n whic h this Orde r i s i n effect , Responden t shal l provid e a cop y o f thi s Orde r t o an y subsequen t owner s o r successors befor e propert y rights , stock , o r asset s ar e transferred

. Responden t

shal l provid e a cop y o f this Orde r t o a l l contractors ,

subcontractors ,

laboratories ,

an d consultant s retaine d t o conduc t an y wor k performe d unde r thi s Order , withi n 

### 1 4 days afte r th e effectiv e dat e o f thi s Order o r a t leas t 7 day s befor e retainin g their services , whicheve r i s later

. Responden t shal l conditio n an y suc h contract s upo n satisfactor y complianc e wit h this Order

. Notwithstandin g

th e terms o f an y contract , 

### Responden t i s responsibl e fo r complianc e wit h this Order an d fo r ensurin g tha t it s employees , contractors ,

consultants , subcontractors ,

agents , an d attorney s compl y wit h thi s Order

. I V

. DEFINITION

S 

### Unles s otherwis e expressl y provide d herein , terms used i n thi s Order whic h are define d i n CERCL A or i n regulation s 

### promulgate d unde r CERCL A shal l hav e th e meanin g assigne d t o the mi

n CERCL A o r suc h regulations

. Fo r purpose s o f thi s Order , th e 

### followin g term s shal l hav e th e meanings se t fort h below : 5

. "Contractor "

mean s an y person , includin g the 

### contractors , subcontractors ,

o r agents , retaine d o r hire d b y Responden t t o undertak e an y wor k unde r thi s Order

. 

### 6

. "Day " mean s calenda r day , unles s otherwis e specified

. 7

. "Deliverable "

mean s an y writte n product , including , bu t 

### no t limite d to , technica l reports , dat a reports, , technica l memoranda , an d othe r document s describin g the wor k performe d o r t o b e performed , require d t o b e submitte d unde r the term s o f thi s Order or the accompanyin g workplans

. 8

. "NCP " mean s th e Nationa l Oi l an d Hazardou s Substance s Pollutio n Contingency Pla n promulgate d under Sectio n 10 5 o f CERCLA , 4 2 U.S.C

. § 9605, codifie d a t 4 0 C.F.R

. Part 300, 

### including , but no t limite d to , an y amendment s thereto

. 9

. "Order " mean s this Order , attachment s t o thi s Order , an d al l document s whic h ar e incorporate d

int o thi s Orde r 

### accordin g t o th e procedure s se t fort h herein

. 1 0

. "Site " mean s th e Californi a Gulc h Superfun d Site , 

### includin g th e area l exten t o f contaminatio n

an d al l suitabl e area s i n ver y clos e proximit y t o th e contaminatio n

necessar y fo r implementatio n o f th e respons e action

. 11

. "Work " mean s al l task s required b y tfri s Order , 

### includin g al l activitie s relate d t o th e performanc e o f suc h activities

. 12

. "Work plan " mean s on e o f th e wor k plan s affixe d heret o 

### a s Exhibit s 1 throug h 6 , includin g change s a s outline d i n Appendi x A

. "Work plan " als o include s any sampling an d analysi s pla n prepare d unde r thi s Order , an d an y othe r plan s o r 

### modification s t o an y suc h wor k o r samplin g an d analysi s pla n approve d b y EP A pursuan t t o thi s Order

. 

### 13

. Al l othe r term s no t otherwis e define d herein , shal l hav e their ordinar y meanin g unles s define d in CERCL A o r th e NCP , i n whic h cas e th e CERCL A o r NC P definitio n shal l control

. V

. GENERA L PROVISION S 1 4

. EPA' s objectiv e i n issuin g thi s Orde r is t o requir e th e 

### performanc e o f certain R I studie s i n accordanc e wit h CERCL A an d th e NC P t o asses s sit e conditions

. 1 5

. Th e activitie s conducte d unde r thi s Orde r ar e subjec t t o approva l b y EP A an d mus t b e sufficien t t o provid e al lnecessar

y informatio n fo r th e R I wor k t o b e performe d unde r thi s 

### Order , an d fo r a record o f decisio n tha t i s consisten t wit h CERCL A an d th e NCP

. Th e activitie s conducte d unde r thi s Orde r 

### shal l b e conducte d i n complianc e wit h CERCLA , th e NCP , an d al l applicabl e EP A guidance , policies , an d procedures

. V I

. FINDING S O F FAC T 1 6

. Th e Site i s liste d o n th e Nationa l Prioritie s Lis t an d 

### i s locate d nea r Leadville , Colorado

. 1 7

. ASARC O

Incorporate d <"ASARCO" ) is a Ne w Jerse y 

### corporatio n wit h it s corporat e headquarter s

i n th e State o f Ne w York

. Responden t own s o r operate s o r ha s owne d o r operate d portion s o f th e Site

. 18

. Th e Sit e discharge s o r has th e potentia l t o discharg e variou s metals , includin g arsenic , cadmium , copper , lea d an d zin c 

### a s follows : Soi l resources o f residential , commercial

, industrial , an d undevelope d land s withi n th e Site hav e bee n an d 

### continu e t o b e subjec t t o impac t b y minin g and relate d activities

. Smelte r slag , tailing s piles , an d wast e roc k pile s containin g high level s o f metal s ar e foun d throughou t th e Site

. Metal s migratio n ca n occu r fro m 

### thes e source s t o nearb y surfac e an d vados e soil s b y win d dispersion , precipitatio n

an d surfac e wate r 

### runoff , an d reworkin g o f thes e surfac e sources, . Mill tailing s ar e th e roc k debris remainin g afte r milling and

- separatio n ha s remove d th e metal as ~ 

### concentrate s fro m th e ore . Tailing s ar e generall y 

### fine-grained , silt-size d particles

. Many pile s an d pond s (wher e wate r i s decante d fro m th e tailings) , ar e locate d o n th e Site

. Thes e tailing s pile s an d pond s 

### ar e a potentia l sourc e o f metal s contaminatio n

a s shown i n previou s studies

. 

### Min e wast e roc k consist s o f min e developmen t roc k an d lo w grad e or e take n fro m belo w groun d an d deposite d 

### nea r adi t o r shaf t openings

. Man y o f th e min e wast e roc k pile s contai n high concentration s

o f arsenic , cadmium , copper , lead , nickel , an d zinc , whic h ma y b e leache d fro m th e minin g wast e durin g time s o f rai n o r snowfall

. Ther e ar e hundred s o f wast e roc k pile s o n 

### t h e Site

. Surfac e wate r act s as th e primary transpor t mechanis m f o r bot h solubl e metal s an d metal-lade n sediments

. Th e 

### Sit e i s draine d b y severa l gulche s tributary t o th e Arkansa s River , including : Evans , California , Iowa ,a n d

Empir e gulches

. Thes e gulche s flo w mostl y i n 

### respons e t o precipitatio n

event s an d snovmelt

. Th e intermitten t flo w o f surfac e vate r over , through , an d around minin g vast e roc k an d tailing s piles , int o th e - gulches , an d ultimatel y int o th e Arkansa s Rive r i s a potentia l source o f metal s contamination

. Groundvate r act s as a transpor t mechanis m fo r solubl e metals

. Groundvate r

i s foun d i n bot h bedroc k and 

### alluvia l systems a t Californi a Gulch , an d recharg e i s principall y fro m infiltratio n o f precipitatio n

an d 

### surfac e vate r drainage

. Groundvate r

i n uppe r Californi a Gulch , occur s primaril y i n th e bedroc k formation s includin g granite , limestone , porphyry , an d sandstones

. Groundvate r

i n th e bedroc k syste m eas t an d southeas t o f Leadvill e discharge s directl y t o 

### California-Gulc h

surfac e vater , int o th e min e vorking s an d th e Ya k Tunnel , o r int o dovngradien t groundvate r 

### systems

. I n love r Californi a Gulch , groundvate r flov s through high terrac e gravels , lak e be d sediments , o r 

### bedroc k units

. Much o f th e groundvate r i n th e are a eventuall y reaches Californi a Gulc h an d Arkansa s River 

### surfac e vate r o r associate d alluvia l groundvate r systems

. Strea m sediment s ma y be affecte d b y migration , alteration , absorption , an d precipitatio n

o f contaminant s fro m source s upstream

. Ai r is

. affecte d b y fugitiv e dus t generate d b y vin d erosion , eart h movemen t durin g construction ,

off-roa d 

### vehicles , an d vehicula r traffi c o n dir t an d grave l roads

. Significan t pathvay s exis t fo r ingestion , inhalation , an d contaminatio n

o f indoo r environment

s vit h hazardou s element s foun d in mining , processing , an d smeltin g vastes a t th e Site

. Flor a an d faun a ma y b e threatene d b y metal s contaminatio n o f th e environment

.

Syste m studie s confir m th e presenc e o f metal s in soils , sediments , an d 

### surfac e vater

. Thes e metal s affec t vegetation , livestock , vildlife , an d macroinvertebrates

. 

### 19

. Arsenic , cadmium , copper , lead , an d zin c ar e "hazardou s substances " pursuan t t o sectio n 101(14 ) o f CERCLA , 4 2 U.S.C

. § 9601

. VII

. CONCLUSION S OF LA W AN D DETERMINATION

S 2 0

. Th e sit e i s a "facility " a s define d i n sectio n 101(9 ) o f CERCLA , 4 2 U.S.C

. § 9601(9)

.21

.

Variou s metal s foun d a t th e Sit e ar e "hazardous substances " a s define d i n sectio n 101(14 ) o f CERCLA , 4 2 U.S.C

. § 

### 9601(14) , o r constitut e "an y pollutan t o r contaminant " tha t ma y presen t a n imminen t an d substantia l dange r t o publi c healt h o r welfar e unde r sectio n 104(a)(1 ) o f CERCLA , 4 2 U.S.C

. § 9604(a)

. 

### 2 2

. Th e past , present , o r potentia l futur e migratio n o f hazardous substances describe d i n sectio n V I o f thi s Order 

### constitute s a n actua l and/o r threatene d "release " as define d i n sectio n 101(22 ) o f CERCLA , 4 2 U.S.C

. § 9601(22)

. 

### 23

. Responden t i s a perso n a s define d in sectio n 101(21 ) o f CERCLA , 4 2 U.S.C

. § 9601(21)

. 

### 24

. Responden t i s a responsibl e part y under section s 104 , 107, an d 12 2 o f CERCLA , 4 2 U.S.C

. § § 9604 , 9607, an d 122

. 

### 25

. Th e action s require d b y this Orde r ar e necessar y t o protec t th e publi c healt h o r welfar e o r th e environmen t an d ar e consisten t wit h CERCL A an d th e NCP

. VIII

. NOTIC E T O STAT E 26

. B y providin g a cop y o f this Order t o th e Stat e o f 

### Colorado , EP A ha s notifie d th e stat e tha t this Order i s bein g issue d an d tha t EP A i s th e lea d agenc y fo r coordinating , 

### overseeing , an d enforcing th e respons e actio n require d b y this Order

. EP A wil l provid e fo r stat e involvemen t with.developmen t 

### o f th e R I studie s i n accordanc e wit h sectio n 121(f ) o f CERCLA , 4 2 CT.S.C

. § 962T(f>

. 

### 27

. An y document , notice , material , o r deliverable , whic h Responden t i s require d under thi s Orde r t o submi t t o EPA , shal l 

### als o b e submitte d b y Responden t t o th e State

. 28

. Th e Stat e an d it s authorize d representative s

shal l be provide d th e sam e right s o f access t o area s t o whic h thi s Orde r 

### applie s a s is provide d fo r EP A i n Sectio n XII

. I X

. PERFORMANC

E O F WOR K 2 9

. Al l Wor k performe d unde r thi s Orde r shal l b e unde r th e directio n an d supervisio n o f qualifie d personnel

.

Withi n 3 0 days o f th e effectiv e dat e o f this Order , an d befor e th e Wor k begins , Responden t shal l notif y EP A in writin g o f th e names , titles , an d 

### qualification s o f th e personnel , includin g contractors , subcontractors ,

consultants ,

and laboratories ,

t o b e used i n carryin g ou t suc h Work

. Th e qualification s

o f th e person s undertakin g th e Wor k fo r Responden t shal l b e subjec t t o EPA' s revie w fo r verificatio n tha t suc h person s mee t minimu m technica l 

### backgroun d an d experienc e requirements

.

I f EP A disapprove s i n writin g o f an y person(s) technica l

qualifications ,

Responden t 8shal

l notif y EP A o f th e identit y an d qualification s

o f th e replacements ) withi n 7 day s o f th e writte n notice

. I f EP A 

### subsequentl y disapprove s o f th e replacement(s) ,

EP A reserve s th e righ t t o terminat e thi s Order , conduc t th e Work , an d see k 

### reimbursemen t fo r cost s an d penaltie s fro m Respondent

. Durin g th e course o f th e Work , Responden t shal l notif y EP A in writin g 7 

### day s i n advanc e o f an y change s o r addition s i n th e personne l used t o carr y ou t suc h Work , providin g their names , titles , an d qualifications

. EF A shal l have th e sam e righ t t o approv e change s an d addition s t o personne l a s i t ha s hereunde r regardin g th e initia l notification

. 30

. Responden t shal l conduc t activitie s an d submi t 

### deliverable s as provide d b y this Orde r an d th e attache d exhibits , 

### whic h ar e incorporate d b y reference

. Al l Wor k performe d i s t o be conducte d in accordanc e wit h th e schedules , standards , specifications , an d othe r requirement

s o f thi s Order , an d th e 

### attache d wor k plans , as initiall y approve d o r modifie d b y EPA , 

### an d as ma y be amende d o r modifie d b y EP A 'fro m tim e t o time

. 3 1

. Responden t shall , prio r t o any off-sit e shipmen t o f hazardou s substance s fro m th e site , provid e writte n notificatio n t o th e appropriat e stat e environmenta l

officia l i n th e receivin g stat e an d to EPA' s Designate d Remedia l Projec t Manage r (RPM ) o f suc h shipmen t o f hazardou s substances

. 

### ( a ) Th e notificatio n referre d t o abov e shal l b e i n writing , a n d shal l includ e th e followin g information s

(T ) th e nam e an d 

### locatio n o f th e facilit y t o which th e hazardou s substance s ar e t o b e shipped ; (2 ) th e typ e an d quantit y o f th e hazardou s substances t o b e shipped ; (3 ) th e expecte d schedul e fo r th e shipmen t o f th e hazardous substances ; an d (4 ) th e metho d of

. transportation

. Responden t shal l notif y th e receivin g stat e o f majo r change s i n 

### th e shipmen t plan , suc h a s a decisio n t o shi p th e hazardous substances t o another.facilit

y withi n the sam e state , o r t o a facilit y i n anothe r state

. 

### ( b ) Th e identit y o f th e receivin g facilit y wil l b e 

### determine d b y Responden t followin g th e awar d o f th e contrac t o r contract s fo r th e Work

. Responden t shal l provid e al l relevan t information , includin g informatio n unde r th e categorie s note d in paragrap h (a ) above , o n th e off-sit e shipments , a s soon a s 

### practica l afte r th e awar d o f th e contrac t an d befor e th e hazardou s substance s ar e actuall y shipped

. 32

. Al l activitie s undertake n b y Responden t shal l be i n complianc e wit h al l Federal , State an d loca l law s an d 

### regulations , includin g permit requirements ,

unles s a n exemptio n i s provide d by sectio n 121(e ) o f CERCLA , 4 2 U.S.C

. § 9621(e)

. Responden t shal l identif y an d obtai n al l permits , licenses , an d 

### approval s require d fo r performanc e o f Work i n sufficien t tim e t o perfor m Wor k a s scheduled

.3 3

.

Th e Exhibit s identif y deliverable s

t o b e produce d unde r t h e term s o f thi s Orde r alon g wit h du e date s fo r thos e 

### deliverables

. Task s referre d t o ar e thos e se t fort h i n thi s Orde r an d th e Exhibits

. X

. MODIFICATIO

N O F WOR K PLAN S 

### 3 4

. I f a t an y tim e durin g performanc e o f th e Wor k a s require d herein

. Responden t identifie s a nee d fo r additiona l 

### data , a memorandu m documentin g th e nee d fo r additiona l dat a shal l 

### be submitte d t o th e designate d RP M withi n 7 day s o f suc h identification

. EP A i n it s discretio n wil l determin e whethe r th e additiona l dat a wil l b e collecte d b y Responden t an d whethe r i t 

### wil l be incorporate d int o report s and

. deliverables

. 35

. I n th e even t o f condition s posin g a n immediat e threa t t o human healt h o r welfar e o r th e environment

, Responden t shal l 

### notif y th e RP M an d th e stat e immediately

. I n th e even t o f 

### unanticipated.o r

change d circumstance s

a t th e site , Responden t shal l notif y th e RP M b y telephon e withi n 2 4 hour s o f discover y o f th e unanticipate d

o r change d circumstances

.

I n additio n t o th e authoritie s i n th e NCP , i n th e even t tha t EP A determine s tha t th e 

### immediat e threa t or the unanticipate d

or change d circumstance s warran t change s i n an y wor k plan , EP A shal l modif y o r amen d suc h 

### wor k pla n in writin g accordingly

. Responden t shal l perfor m th e wor k pla n a s 'modifie d o r amended

. 

### 36

. EP A ma y determin e tha t i n additio n t o task s define d i n an y initiall y approve d wor k plan , othe r work , ma y b e necessar y t o 

### accomplis h th e objective s o f th e Work

. EP A ma y requir e tha t Responden t perfor m thes e respons e action s i n additio n t o those, required b y an y initiall y approve d wor k plan , includin g an y approve d modifications ,

i f i t determine s tha t suc h actions ar e necessar y t o adequatel y complet e th e Work

. Responden t shal l confir m it s willingnes s t o perfor m th e additiona l wor k in writin g t o EP A withi n 7 day s o f receip t o f th e EP A request

. Responden t shal l implemen t th e additiona l task s whic h EP A determine s ar e 

### necessary . Th e additiona l wor k shal l b e complete d accordin g t o 

### th e standards , specifications ,

an d schedul e se t fort h o r approve d b y EP A i n a writte n modificatio n t o an y wor k pla n o r writte n supplement s thereto

. EP A reserves th e righ t t o conduc t th e Wor k itsel f a t an y point , t o see k reimbursemen t

fro m Respondent , 

### and/o r t o see k an y othe r appropriat e relief

. X I

. QUALIT Y ASSURANCE , SAMPLING, DAT A ANALYSIS , AN D AVAILABILIT

Y 3 7

. Responden t shal l assur e tha t wor k performed, sample s taken , an d analyse s conducte d confor m t o th e requirement

s o f th e wor k plan s an d guidanc e identifie d therein

. 1 03 8

.

I n th e even t tha t th e Responden t fail s t o us e th e QA/Q C 

### practice s an d procedure s a s outline d i n th e wor k plan s approve d hereunder , EP A reserves th e righ t t o conduc t al l Wor k identifie d herein , includin g a complet e RI/F S o r any portio n thereo f pursuan t t o it s authorit y unde r CERCLA , t o see k reimbursemen t 

### fro m Respondent , and/o r t o see k any othe r appropriat e relief

. 3 9

. Al l result s o f sampling , tests , modeling , o r othe r dat a (including ra w chemica l analytica l data) generate d b y Respondent , o r o n Respondent' s behalf , durin g implementatio n

o f thi s Order , shal l be submitte d t o EP A in a n electroni c fil e forma t usin g th e E P A contrac t laboratory progra m (CLP ) forma t A (a s describe d i n Exhibit H o f th e EP A CL P Statemen t o f Wor k fo r Inorgani c 

### Analysis , Multi-media ,

Multi-concentrate

) o r a n ASCI I fil e format, alon g wit h th e monthl y progres s repor t a s describe d in Sectio n XI V o f thi s Order

. EP A wil l make availabl e t o th e Responden t validate d dat a generate d b y EP A unles s i t i s exemp t 

### fro m disclosur e b y an y federa l o r stat e la w o r regulation

. 40

. Responden t wil l notif y EP A in writin g a t leas t 1 5 day s prio r t o conductin g significan t fiel d event s a s describe d in an y wor k plan , o r samplin g an d analysi s plan

. A t EPA' s verba l o r writte n request , o r a t th e reques t o f EPA' s oversigh t assistant , 

### Responden t shal l allo w spli t o r duplicate sample s t o b e take n b y E P A (and/o r it s authorize d representatives

) o f any sample s collecte d b y th e Responden t i n implementin g this Order

. 4 1

. I f Responden t object s t o dat a relatin g t o th e R I Wor k identifie d herein , Responden t shal l submi t t o EP A a repor t tha t 

### identifier

- an d explain s it s objections , describe s th e acceptabl e use s o f th e data , i f any , an d identifie s an y limitation s t o th e 

### us e o f th e data

. Th e repor t mus t be submitte d t o EP A withi n 1 5 day s o f th e monthl y progres s repor t containin g th e data

. XII

. ACCESS

- 42

. EP A an d it s authorize d representative s

ma y ente r an d 

### freel y mov e abou t al l propert y a t th e sit e an d off-sit e area s where Work , i f any , is bein g performed , fo r th e purpose s o f inspectin g conditions ,

activities , th e result s 'o f activities , 

### records , operatin g logs , an d contract s relate d t o th e sit e o r 

### Responden t an d it s contractors ) pursuan t t o this Order ; reviewin g th e progres s o f Responden t in carryin g ou t th e terms o f this Order ; conductin g test s as EP A o r it s authorize d representative s

dee m necessary ; usin g a camera , sound recordin g device , o r othe r recordin g equipment ; an d verifyin g th e dat a submitte d t o EP A b y Respondent

. Responden t shal l allo w thes e person s t o inspec t an d cop y al l records , files , photographs , documents , samplin g an d monitorin g data , an d othe r writing s relate d t o wor k undertake n in carryin g ou t thi s Order

. Nothin g 

### herein shal l be interprete d as limiting o r affectin g an y EP A 1 1

### representative' s

righ t o f entr y o r inspectio n authorit y unde r federa l lav

. 4 3

. I f fo r prope r performanc e o f th e Work , i t is necessar y t o ente r propert y owne d in 'whol e o r in par t b y partie s othe r tha n thos e boun d b y thi s Order , Responden t wil l obtain , o r us e it s bes t effort s t o obtain , sit e access agreement s fro m th e owne r 3 0 

### day s prio r t o th e tim e suc h access i s needed

. Suc h agreement s shal l provid e acces s fo r EPA , it s contractors an d oversigh t officials , th e State o f Colorad o an d it s contractors ,

an d th e Responden t o r it s authorize d representatives

.

Suc h agreement s shal l specif y tha t Responden t i s no t EPA' s representativ e

wit h respec t t o liabilit y associate d wit h sit e activities

. Copie s o f suc h agreement s shal l be provide d t o EP A prio r t o Respondent' s initiatio n o f fiel d activities

. « 

### 44

. I f acces s agreement s ar e no t obtaine d withi n th e tim e reference d above , Responden t shal l promptl y notif y EP A o f it s 

### failur e t o obtain access . EP A ma y obtain acces s fo r th e Respondent , perfor m thos e task s o r activitie s wit h EF A contractors , o r terminat e th e Orde r i n th e even t tha t Responden t canno t obtai n acces s agreements

. I n th e even t tha t EP A perform s 

### thos e task s o r activitie s wit h EP A contractor s an d doe s no t terminat e th e Order , Responden t shal l perfor m al l othe r 

### activitie s no t requirin g acces s t o tha t site , an d shal l reimburs e E P A fo r al l cost s incurre d i n performin g suc h activities

. Responden t additionall y shal l integrat e th e result s o f any suc h 

### task s undertake n b y EP A int o it s report s an d deliverables

. Responden t shal l reimburs e EF A fo r al l cost s an d attorne y fee s 

### Incurre d by/ , th e Unite d State s i n obtainin g acces s fo r th e Respondent

. XIII

. PUBLI C COMMENT , ADMINISTRATIV

E RECORD 45 « EPA

. retains, the

_ responsibilit y lo r th e releas e t o th e publi c o f an y report s base d upo n th e Work

. 46

. EP A ma y provid e Responden t wit h copie s o f an y repor t 

### based upo n th e Wor k an d th e fina l RI/F S report

. 47

. EP A wil l determin e th e content s o f th e administrativ e record fil e fo r selectio n o f th e remedia l action

. Responden t 

### must submi t t o EF A document s develope d durin g th e cours e o f th e Wor k upo n whic h selectio n o f th e respons e actio n ma y be based

. Responden t shal l provid e copie s o f plans , tas k memorand a includin g documentatio n

o f fiel d modifications ,

recommendation s f o r furthe r action , qualit y assuranc e memorand a an d audits , ra w data , fiel d notes , laboratory analytica l reports , an d othe r reports

. Responden t

mus t additionall y submi t an y previou s 

### studie s conducte d unde r state , local , o r othe r federa l authoritie s relatin g t o selectio n o f th e respons e action , an d al l communication s

betwee n Responden t an d state , local , o r othe r 12federa l

authoritie s concernin g sele'ctio n o f th e respons e action

. A t EPA' s discretion , Responden t ma y establis h a communit y 

### informatio n repositor y at o r nea r the site , t o hous e one cop y o f th e administrativ e

record

. XIV

. REPORTIN G REQUIREMENT

S 

### 48

. Responden t shal l mak e presentation s

a t an d participat e i n meeting s 'a t th e reques t o f EP A durin g th e initiation , conduct , an d completio n o f th e Work

. I n additio n t o discussio n o f th e 

### technica l aspect s o f th e Work , topic s wil l includ e anticipate d problem s o r ne w issues

. Meeting s wil l b e schedule d a t EPA' s discretion

. 49

. I n additio n t o th e deliverajble s se t fort h in this Order , Responden t shal l provid e t o EP A monthl y progres s report s b y th e 10t h da y o f eac h mont h durin g whic h this Orde r i s i n effect

. A t a minimum , wit h respec t t o th e precedin g month , thes e 

### progres s report s shall : (1 ) describ e th e action s whic h have bee n take n t o compl y with'thi s Order durin g tha t month ; (2 ) includ e 

### al l result s o f samplin g an d test s an d al l othe r dat a collecte d o r receive d b y Respondent ; (3 ) describ e wor k planne d fo r th e nex t 

### tw o month s wit h schedule s relatin g suc h wor k t o th e overal l projec t schedul e fo r completio n o r Work ; an d (4 ) describ e al l problem s encountere d and an y anticipate d problems , an y actua l or anticipate d delays , an d solution s develope d an d implemente d t o addres s any , actua l o r anticipate d problem s o r delays

. X V

. SUBMISSION

S REQUIRIN G AGENC Y APPROVA L 50

. EP A reserve s th e righ t t o commen t on , modify , an d 

### direc t change s fo r al l deliverables

.

Whe n EP A comment s o n o r direct s changes t o deliverables ,

th e followin g procedure s shal l 

### apply : a . Responden t

mus t full y correc t al l deficiencie s

an d 

### incorporat e an d integrat e al l informatio n an d comments , a s directe d b y EPA , within seven (7 ) day s o f receip t o f EP A comments , unles s otherwis e specifie d i n an y schedul e i n th e wor k plan s approve d hereunder

. b

. Responden t

ma y request , an d EP A shal l grant , a meetin g t o discus s an y comment s o r instruction s fro m EPA , prio r 

### t o resubmittin g th e deliverable

. I f EPA , i n consultatio n wit h th e stat e o f Colorado , agree s tha t 

### it s comment s o r instruction s ar e incorrec t o r shoul d b e modified , Responden t ma y resubmi t th e deliverable s in accordanc e wit h EPA' s decision

. c . A t th e tim e an y revise d deliverabl e i s submitted , Responden t shal l submi t a cove r lette r describin g ho w eac h substantiv e EP A comment wa s addressed , and a 1 3descriptio n o f an y additiona l substantiv e

change s o r 

### addition s in th e resubmitta l alon g wit h a justificatio n f o r thos e change s o r additions

. Th e cove r lette r shal l als o includ e a certificatio n tha t n o substantiv e change s othe r tha n thos e identifie d in th e cover lette r wer e made

. Failur e t o addres s EP A comment s o r direction s as describe d i n this paragraph , o r failur e t o identif y additiona l substantiv e change s o r addition s i s a violatio n o f thi s Order

. d

. I f Responden t disagree s wit h th e substantiv e changes require d b y EPA , Responden t ma y includ e a disclaime r i n 

### th e cove r lette r identifying th e portion(s) o f suc h document s wit h whic h th e Responden t disagree s an d th e reason s fo r th e disagreement

.

Wheneve r an d t o whomever th e documen t i s disseminated

, EP A wil l includ e suc h 

### cove r lette r wit h th e deliverable

. Suc h cove r lette r shal l be include d in th e Administrativ e

Record fo r th e Site a s provide d unde r Sectio n XIII

. 5 1

. I f Responden t fail s t o compl y wit h th e precedin g paragraph , o r i f EF A determine s that additiona l changes o r addition s wer e include d in a resubmitta l withou t sufficien t 

### justification , EP A retain s th e righ t t o see k statutor y penalties , perfor m it s ow n studies , o r complet e o r modif y th e deliverabl e o r an y portio n thereo f an d see k reimbursement

fro m Responden t fo r it s costs

. T o th e exten t tha t EP A conduct s o r take s ove r som e o f 

### t h e Work , Responden t shal l incorporat e an d integrat e informatio n supplie d b y EP A into , an y repor t o n suc h Work

. 52

. I n th e event.tha t EP A takes ove r som e o f th e tasks , Responden t shal l incorporat e an d integrat e informatio n supplie d 

### b y EP A int o an y report s prepare d b y it

. 53

. Neithe r failur e of 1 EP A to 0 expressl y approv e o r disapprov e o f Respondent' s submission s

withi n th e specifie d tim e periods , no r th e absenc e o f comments , shal l b e construe d a s approva l b y EPA

. Whethe r o r no t EP A give s expres s approva l fo r 

### Respondent' s deliverables ,

Responden t i s responsibl e fo r preparin g deliverable s acceptabl e t o EPA

. XVI

. REMEDIA L PROJEC T MANAGER 54

. Al l communications ,

whethe r writte n o r oral , fro m Responden t t o EP A shal l b e directe d t o on e o f EPA' s RPMs

. 

### Responden t shal l submi t t o EP A thre e copie s o f al l documents , includin g plans , reports , an d othe r correspondence ,

whic h ar e develope d pursuan t t o this Order , an d shal l han d delive r o r sen d thes e document s retur n receip t requested

.
14EPA' s

RP M concernin g Exhibit s 1- 5 is : 

### K e n Wangerud , 8HW M E P A Remedia l Projec t Manage r 

### Hazardou s Wast e Managemen t Divisio n E P A Regio n VII I 9 9 9 18t h Street, Suit e 50 0 Denver , C O 80202-240 5
* EPA' s RP M concernin g Exhibi t 6 is : Denis e Link , 8HW M 

### E P A Remedia l Projec t Manage r Hazardou s Wast e Managemen t Divisio n E P A Regio n VII I 9 9 9 18t h Street, Suit e 50 0 Denver , C O 80202-240 5 

### 5 5

. EP A ha s th e unrevievabl

e righ t t o chang e it s RPMs

. I f E P A change s eithe r o f it s RPMs , EP A wil l infor m Responden t i n writin g o f th e name , address , an d telephon e number o f th e ne w RPM

. 5 6

. EPA' s RPM s shal l have th e authorit y lawfully veste d i n RPM s an d On-Scen e Coordinator s

(OSCs ) b y th e NCP , 4 0 C.F.R

. Par t 300

. EPA' s RPM s shal l hav e authority , consisten t wit h th e NCP , 

### t o hal t an y wor k require d b y thi s Order , and t o tak e an y necessar y respons e action

. 5 7

. Withi n te n (10 ) days afte r th e effectiv e dat e o f this Order , Responden t shal l designat e a Projec t Coordinato r an d shal l 

### submi t th e name , address , an d telephon e numbe r o f th e Projec t Coordinato r t o EP A fo r revie w an d approval

. Respondent' s

Projec t Coordinato r shal l b e responsibl e fo r overseein g Respondent' s implementatio n o f thi s Order

. I f Responden t wishe s t o chang e it s Projec t Coordinator ,

Responden t shal l provid e writte n notic e t o EPA , fiv e (5 ) day s prio r t o changin g th e Projec t Coordinator ,

o f 

### th e nam e an d qualification s

o f th e ne w Projec t Coordinator

. Respondent' s selectio n o f a Projec t Coordinato r shal l b e subjec t t o EP A approval

. XVII

. ASSURANC E O F ABILIT Y T O COMPLET E WOR K 

### 58

. Responden t shal l establis h an d maintai n a financia l instrument , trus t account , o r othe r financia l mechanis m suc h a s one'o f thos e se t fort h a t 4 0 C.F.R

. Part 264.143 , acceptabl e t o EPA , funde d sufficientl y t o perfor m th e wor k an d an y othe r obligation s require d unde r this Order , includin g a margi n fo r cos t overruns . Withi n 1 5 day s o f th e effectiv e dat e o f thi s 

### Order , Responden t shal l eithe r fun d th e financia l instrumen t o r trus t accoun t o r demonstrat e t o th e satisfactio n o f EP A tha t it s 1 5financia l

resource s ar e sufficien t t o perfor m th e wor k require d unde r this Orde r projecte d fo r th e perio d beginnin g wit h th e effectiv e dat e o f th e Order throug h th e en d o f th e curren t calenda r year quarter

. O n o r befor e th e 15t h calenda r da y o f 

### eac h calenda r year quarte r thereafter , Responden t shal l eithe r fun d th e financia l instrumen t o r trus t accoun t o r demonstrat e t o th e satisfactio n o f EP A tha t it s financia l resources ar e 

### sufficien t t o perfor m th e wor k an d othe r activitie s require d unde r this Order projecte d fo r th e succeedin g calenda r yea r quarter

. Withi n 5 day s o f th e fundin g o f an y account o r othe r mechanis m o r th e demonstratio n

o f abilit y t o perfor m Work , Responden t shal l repor t suc h t o th e RPM

. 

### 5 9

. I f a t an y tim e th e ne t wort h o f th e financia l instrumen t o r trus t accoun t i s insufficien t o r the othe r 

### demonstratio n o f financia l abilit y i s inadequat e t o assur e performanc e o f th e Wor k an d othe r obligation s unde r th e Orde r fo r 

### th e upcomin g quarter , Responden t shal l provid e writte n notic e t o 

### E P A withi n 7 day s afte r th e ne t wort h o f th e financia l instrument , trus t accoun t o r othe r demonstratio n

o f financia l abilit y become s insufficien t o r inadequate

. Th e writte n notic e shal l describ e wh y th e financia l instrument , trus t account o r 

### othe r demonstratio n

o f financia l abilit y is insufficien t an d shal l explai n wha t action s have bee n o r wil l be take n t o fun d th e financia l instrumen t or trus t accoun t adequatel y or t o 

### demonstrat e t o th e satisfactio n o f EP A tha t it ha s th e financia l resources t o continu e th e Wor k through th e tim e perio d required

. E P A reserves th e righ t t o terminat e thi s Orde r i f fundin g become s or wil l becom e inadequate

. XVIII

. CERTIFICATION

O F COMPLETION , TERMINATIO N 6 0

. Thi s Orde r shal l terminat e whe n Responden t demonstrate s 

### in writin g an d certifie s t o th e satisfactio n o f EP A tha t al l activitie s require d unde r thi s Order , includin g an y additiona l work , ar e complete

. 

### 61

. Th e certificatio n shal l b e signe d b y a responsibl e officia l representin

g Respondent

.

Th e representativ e

shal l make t h e followin g attestation :

" I certif y tha t th e informatio n containe d i n o r accompanyin g thi s certificatio n

i s true , accurate , an d complete. " Fo r purpose s o f this Order , a 

### responsibl e officia l i s a corporat e officia l wh o i s i n charg e o f a principa l busines s function

. XIX

. EMERGENC Y RESPONS E 62

. I n th e even t o f an y actio n o r occurrenc e durin g th e 

### performanc e o f th e Work whic h cause s o r threaten s a releas e o f wast e materia l tha t constitute s a n emergenc y situatio n o r ma y presen t a n immediat e threa t t o publi c healt h o r welfar e o r th e 1 6environment

, Responden t shall , subjec t t o th e followin g 

### paragraph , immediatel y tak e al l appropriat e actio n t o prevent , abate , o r minimiz e suc h releas e o r threa t o f release , an d shal l 

### immediatel y notif y th e RPM

. I f this perso n is no t available , th e Responden t shal l notif y th e EP A Emergenc y Respons e Branch,

. Regio n 

### VIII

. Responden t shal l tak e suc h action s i n consultatio n wit h th e RP M an d i n accordanc e wit h al l applicabl e provision s o f th e Health an d Safet y Plans , th e Contingenc y Plans , o r any othe r applicabl e plan s o r document s develope d pursuan t t o this Order

. I n th e even t tha t Responden t fail s t o tak e appropriat e respons e actio n a s require d b y thi s Section , an d EP A take s suc h actio n 

### instead , Responden t shal l reimburs e EP A al l cost s o f th e respons e actio n no t inconsisten t wit h th e NCP

. 

### 63

. Nothin g i n th e precedin g paragrap h o r i n thi s Orde r shal l be deeme d t o limit an y authorit y o f th e Unite d State s t o 

### take , direct , or orde r al l appropriat e actio n or t o see k an orde r i n a Cour t o f competen t jurisdictio n

t o protec t human healt h an d 

### th e environmen t or t o prevent , abate , or minimiz e a n actua l or threatene d releas e o f wast e materia l on , at , o r fro m th e Site

. X X

. INSURANC E

AN D INDEMNIFICATIO N 64

. (a ) Prio r t o commencemen

t o f an y wor k unde r this Order , Responden t shal l secure , an d shal l maintai n i n forc e fo r th e duratio n o f thi s Order , an d fo r tw o year s afte r th e completio n o f al l activitie s require d b y thi s Order, 

### Comprehensiv e Genera l Liabilit y (CGL ) an d automobil e insurance , wit h limit s o f $2,000,000.0 0

dollars , combine d singl e limit

r 

### namin g as insure d th e Unite d States*

. Th e CG L insuranc e shal l 

### includ e Contractua l Liabilit y Insuranc e i n th e amount o f $2,000,000.0 0 pe r occurrence , an d Umbrell a Liabilit y insuranc e in the amoun t o f $2,000,000.0 0

pe r occurrence . Responden t may A i n lie u o f CG L insurance , provid e t o EP A a cop y o f it s certificat e o f sel f insurance

. 

### ( b ) Responden t shal l als o secure , an d maintain i n forc e Professiona l Error s an d Omission s insuranc e in th e amount o f $1,000,000.0 0

pe r occurrenc e fo r th e duratio n o f thi s Orde r 

### an d fo r tw o year s afte r th e completio n o f al l activitie s require d b y this Order . 

### ( c ) Fo r th e duratio n o f thi s Order , Responden t shal l satisfy , o r shal l ensur e tha t thei r contractor s o r subcontractor s satisfy , al l applicabl e law s an d regulation s regardin g th e provisio n o f employer' s liabilit y insuranc e an d workmen' s compensatio n insuranc e fo r al l person s performin g wor k o n behal f 

### o f Respondent , i n furtheranc e o f thi s Order

. ( d ) I f Responden t demonstrate s

b y evidenc e 

### satisfactor y t o EP A tha t an y contracto r o r subcontracto r maintain s insuranc e equivalen t t o tha t describe d above , o r 1 7insuranc e

coverin g the sam e risk s but i n a lesse r amount , the n wit h respec t t o tha t contracto r o r subcontractor ,

Responden t nee d 

### provid e onl y tha t portio n o f th e insuranc e describe d abov e which i s no t maintaine d b y th e contracto r o r subcontractor

. 

### ( e ) A t leas t 7 day s prio r t o commencement

o f an y wor k under this Order , an d annuall y thereafte r o n th e anniversar y o f t h e effectiv e dat e o f thi s Order , Responden t shal l provid e t o EP A certificate s o f suc h insuranc e an d a cop y o f eac h insuranc e policy

. Responden t shal l certif y t o EP A tha t th e require d 

### insuranc e ha s bee n obtaine d b y tha t contractor

. 65

. EP A shal l no t be liabl e fo r an y injur y o r damage s t o 

### person s o r propert y resultin g fro m act s o r omission s o f th e Responden t o r it s Contractor s i n implementin g th e requirement

s o f thi s Order o r an y EPA-approve d wor k pla n o r plannin g documents

. 

### EP A shal l not b e considere d a part y t o an y contrac t entere d int o 

### b y Responden t fo r purpose s o f implementin g thi s Order

. 6 6

. Responden t shal l indemnif y an d hol d th e Unite d State s Government , it s agencies , departments ,

agents , an d employee s harmles s fro m an y an d al l claim s o r cause s o f actio n arisin g fro m or on accoun t o f act s or omissions o f Respondent , it s employees , agents , servants , receivers , successors , o r assigns , o r an y 

### person s including , bu t no t limite d to , firms , corporations , subsidiaries , an d contractors , i n carryin g ou t activitie s unde r thi s Order

. XXI

.

DELA Y I N PERFORMANC E 

### 6 7

. An y dela y i n performanc e o f thi s Orde r that , i n EPA' s judgment , i s no t properl y justifie d b y Responden t unde r the

. term s of * thi s paragrap h shal l be considere d a violatio n o f thi s Order

. A n y dela y in performanc e o f this Orde r shal l no t affec t 

### Respondent' s obligation s

t o full y perfor m al l obligation s unde r th e term s an d condition s o f thi s Order

. 

### 6 8

. Responden t shal l notif y EP A o f an y dela y o r anticipate d dela y in performin g an y requiremen t o f this Order

. Suc h 

### notificatio n shal l be mad e b y telephon e t o th e RP M withi n fort y eigh t (48 ) hour s afte r Responden t firs t kne w o r shoul d have known tha t a dela y migh t occur . Responden t shal l adop t al l reasonabl e measure s t o avoi d o r minimiz e an y suc h delay

. Withi n fiv e (5 ) busines s day s afte r notifyin g EP A b y telephone , Responden t shal l provid e writte n notificatio n fully describin g th e natur e o f th e 

### delay , an y justificatio n fo r delay , an y reaso n wh y Responden t shoul d no t b e hel d strictl y accountabl e fo r failin g t o compl y wit h an y relevan t requirement

s o f this Order , th e measure s 

### planne d an d take n t o minimiz e th e delay , an d a schedul e fo r implementin g th e measures tha t wil l be take n t o mitigat e th e 

### effect s o f th e delay

. Increase d cost s o r expense s associate d 1 8

### vit

h implementatio n

o f th e activitie s calle d fo r i n thi s Orde r i s no t a justificatio n fo r an y dela y in performance

. XXII

. UNITE D STATE S NO T LIABLE 

### 69

. Th e Unite d States , b y issuanc e o f thi s Order , assumes 

### no liabilit y fo r an y injurie s o r damages t o person s o r property

resultin g fro m act s o r omission s b y Respondent , o r thei r directors , officers , employees , agents , representatives , 

### successors , assigns , contractors ,

o r consultant s i n carryin g out an y actio n o r activit y pursuan t t o thi s Order

. Neithe r EP A no r 

### the Unite d State s ma y b e deeme d t o b e a part y t o an y contrac t entere d int o b y Responden t o r it s directors , officers , employees , 

### agents , successors , assigns , contractors ,

o r consultant s i n carryin g ou t An y actio n o r activit y pursuan t t o thi s Order

. XXIII

. ENFORCEMEN

T AN D RESERVATION S 70

. EP A reserve s the righ t t o brin g an actio n agains t Responden t unde r sectio n 10 7 o f CERCLA , 4 2 U.S.C. i 9607 , fo r 

### recover y o f an y respons e cost s incurre d b y th e Unite d State s relate d t o this Order

. Thi s reservatio n

shal l includ e bu t no t b e 

### limite d t o pas t costs , direc t costs , indirec t costs , th e cost s o f 

### oversight , th e cost s o f compilin g th e cos t documentatio n

t o suppor t oversigh t cost demand , accrue d interes t a s provide d i n sectio n 107(a ) o f CERCLA , 4 2 U.S.C. i 9607(a) , an d any an d al l 

### othe r cost s no t inconsisten t wit h th e NCP

. 

### 7 T

. Notwithstandin

g an y othe r provisio n o f thi s Order , a t an y time durin g th e respons e action , EP A ma y perfor m it s ow n studies , complet e th e respons e actio n (o r an y portio n o f th e respons e action ) a s provide d i n CERCL A an d th e NCP , an d ma y see k reimbursemen t fro m Responden t fo r it s costs , o r see k an y othe r 

### appropriat e relief

. 7 2

. Nothing.i n this Orde r shal l preclud e EP A fro m takin g a ny additiona l enforcemen t

actions , includin g modificatio n

o f thi s Order o r issuanc e o f additiona l Orders , and/o r additiona l 

### remedia l or remova l actions a s EP A ma y dee m necessary , or fro m requirin g Responden t in th e futur e t o perfor m additiona l activitie s pursuan t t o CERCLA , 4 2 U.S.C

. § 9606(a) , e t seq. , o r an y othe r applicabl e law

. Responden t shal l be liabl e unde r CERCL A sectio n 107(a) , 4 2 U.S.C

. § 9607(a) , fo r th e cost s o f any suc h additiona l actions

. 73

. Notwithstandin

g an y provisio n o f thi s Order , th e Unite d 

### State s hereb y retains al l o f it s informatio n gathering , inspectio n an d enforcemen t authoritie s an d right s unde r CERCLA , RCR A an d an y othe r applicabl e statute s o r regulations

. 

### 74

. Responden t shal l be subjec t t o civi l penaltie s unde r sectio n 106(b ) o f CERCLA , 4 2 U.S.C

. § 9606(b) , o f no t mor e tha n 1 9$25,00 0

fo r eac h day i n which Responden t willfull y violates , o r 

### fail s o r refuse s t o compl y wit h thi s Order withou t sufficien t cause . I n addition , failur e t o properl y provid e respons e actio n unde r thi s Order , o r an y par t hereof , withou t sufficien t cause , m a y resul t i n liabilit y unde r sectio n 107(c)(3 ) o f CERCLA , 4 2 U.S.C

. § 9607(c)(3) , fo r punitiv e damage s i n a n amoun t a t leas t equal to , an d no t mor e tha n thre e time s th e amount o f an y cost s 

### incurre d b y th e Fun d a s a resul t o f suc h failur e t o tak e prope r action

. 75

. Nothing i n this Order shal l constitut e o r b e construe d a s a releas e fro m an y claim , caus e o f actio n o r deman d i n la w o r equit y agains t an y perso n fo r an y liabilit y i t ma y hav e arisin g 

### ou t o f or relatin g i n an y wa y t o th e Site

. 

### 76

. I f a cour t issue s a n orde r tha t invalidate s an y provisio n o f this Orde r o r find s tha t Responden t ha s sufficien t 

### cause no t t o compl y wit h on e o r mor e provision s o f thi s Order , Responden t shal l remai n boun d t o compl y wit h al l provision s o f 

### thi s Orde r no t invalidate d b y th e court' s order

. 77

. I n the even t o f an y inconsistenc

y betwee n the term s and 

### condition s o f this Order o r thos e containe d i n an y wor k pla n approve d hereunder , schedules , attachments ,

exhibits , o r othe r document s incorporate d

herein , th e term s an d condition s o f thi s Orde r shal l tak e precedence

. XXIV

. ACCES S T O INFORMATIO N 78

. Responden t shal l provid e t o EP A upo n request , copie s o f al l document s an d informatio n withi n their possessio n o r contro l o r tha t o f thei r contractor s o r agent s relatin g t o activitie s a t 

### th e Sit e o r t o th e implementatio n

o f thi s Order , including , bu t no t limite d to , sampling , analysis , chain-of-custod

y records , manifests , truckin g logs , receipts , reports , sampl e traffi c routing , correspondence ,

o r othe r document s o r informatio n 

### relate d t o th e Work

. Responden t shal l als o mak e availabl e t o EPA , fo r purpose s o f investigation ,

informatio n gathering , o r testimony , their employees , agents , o r representative s

wit h knowledg e o f relevan t facts.concernin

g th e performanc e o f th e Work

. 7 9

. Responden t ma y asser t busines s confidentialit

y claim s coverin g par t o r al l o f th e document s o r informatio n submitte d t o 

### E P A under thi s Order t o th e exten t permitte d b y sectio n 104(e)(7 ) o f CERCLA , 4 2 U.S.C

. § 9604(e)(7)

. Suc h claim s shal l b e asserte d in th e manne r describe d b y 4 0 C.F.R

. § 2.203(b ) an d substantiate d at the time the clai m i s made

. Document s or informatio n 

### determine d t o b e confidentia l b y EP A wil l b e afforde d th e protectio n specifie d i n 4 0 C.F.R

. Par t 2 , Subpar t B

. I f n o clai m 

### o f confidentialit

y accompanie s

document s o r informatio n whe n the y a r e submitte d t o EPA , o r i f EP A ha s notifie d Responden t tha t th e 2 0

### document

s or informatio n are no t confidentia l under th e standard s o f sectio n 104(e)(7 ) o f CERCLA , 4 2 U.S.C

. § 9604(e)(7) , th e 

### publi c ma y b e give n acces s t o suc h document s o r informatio n without furthe r notic e t o Respondent

. 

### 80

. N o claim o f confidentialit

y shal l b e mad e wit h respec t t o an y data , including , but no t limite d to , al l sampling , analytical,.monitoring ,

hydr©geologic ,

scientific , chemical , o r engineerin g dat a and material s or informatio n submitte d pursuan t t o thi s Order, o r an y other document s o r informatio n evidencin g condition s a t o r aroun d th e Site

. XXV

. RETENTIO N O F RECORD S 

### 81

. Al l record s an d document s in Respondent' s possessio n tha t relat e i n an y wa y t o th e sit e .shal l b e preserve d whil e thi s Orde r i s i n effec t and for a minimu m o f 1 0 year s afte r 

### commencemen t o f constructio n o f an y remedia l action

. Responden t shal l acquir e an d retai n copie s o f al l document s that relat e t o the sit e and are i n the possessio n o f it s employees , agents , accountants , contractors ,

o r attorneys

. Afte r thi s 10-yea r period , Responden t shal l notif y EP A a t leas t 9 0 day s befor e th e 

### document s ar e schedule d t o be destroyed

. I f EP A request s that th e document s b e saved , Responden t shall , a t n o cos t t o EPA , giv e EP A th e document s o r copies o f th e documents

. XXVI

. EFFECTIV E DAT E 

### 82

. The effectiv e dat e o f thi s Orde r shal l b e the dat e i t i s signed , b y EBA

. XXVII

. COMMUNIT

Y RELATION S 83

. EP A ma y prepar e a communit y relation s pla n describin g 

### th e activitie s i t wil l undertak e t o disseminat e informatio n regardin g th e Work t o th e public

. Responden t shal l cooperat e wit h EP A (an d th e State ) i n providin g informatio n regardin g th e Work t o th e public

. A s requeste d b y EPA , Responden t shal l participat e i n th e preparatio n o f suc h informatio n fo r 

### disseminatio n t o th e publi c an d i n publi c meeting s whic h ma y b e hel d o r sponsore d b y EP A t o explai n activitie s a t o r relatin g t o th e Site

. XXVIII

.

MODIFICATIO N 84

. Thi s Orde r ma y b e amended b y EPA

. Amendment s shal l b e 

### i n writin g and shal l b e effectiv e whe n signe d b y EPA

. 85

. N o informa l advice , guidance , suggestions ,

assurances , 

### or comment s b y EP A or it s authorize d representative s

shal l modif y th e term s an d condition s o f thi s Order o r reliev e Responden t o f 

### it s obligatio n under thi s Order

. An y deliverables , plans , 2 1technica l

memoranda , report s (othe r tha n progres s reports) , specifications , schedules ,

an d attachment s require d b y this Order are, upo n approva l b y EPA , incorporate d int o this Order

. XXIX

. OPPORTUNIT

Y T O CONFE R 

### 8 6

. Responden t may, within fiv e (5 ) day s afte r th e dat e thi s Order i s signed , reques t a conferenc e wit h th e EP A Regio n VII I staf f attorne y responsibl e fo r this matte r t o discus s thi s • Order

. 87

. Th e purpos e an d scop e o f th e conferenc e shal l be limite d t o issue s involvin g th e implementatio n

o f th e respons e 

### action s require d b y thi s Orde r an d th e exten t t o which Responden t inten d t o compl y wit h this Order

. Thi s conferenc e i s no t a n evidentiar y hearing , an d does no t constitut e a proceedin g t o 

### challeng e thi s Order

. I t does no t giv e Responden t a righ t t o see k revie w o f thi s Order , o r t o see k resolutio n o f potentia l 

### liability , an d n o officia l stenographi c

record o f th e conferenc e wil l b e made

. A t an y conferenc e hel d pursuan t t o Respondent' s 

### request

. Responden t ma y appea r i n perso n o r b y a n attorney o r othe r representative

. 

### 88

. Request s fo r a conferenc e mus t be b y telephon e followe d by * writte n confirmatio n

maile d tha t da y to : Andre w J

. Lensink , 8R C 

### Assistan t Regiona l Counse l Offic e o f Regiona l Counse l EPA Regio n VII I 9 9 9 18t h Street , Suit e 50 0 Denver, C O 80202-240 5 (303 ) 294-757 4 XXX

. NOTICE O F INTEN T TO

. COMELY

8 9

. Responden t shal l provide , no t late r tha n fiv e (5 ) day s afte r th e effectiv e dat e o f thi s Order , writte n notic e t o th e RP M 

### statin g whethe r i t wil l compl y wit h th e term s o f this Order

. I f Responden t does no t unequivocall

y commi t t o perfor m th e Wor k a s 

### provide d b y thi s Order , i t shal l b e deeme d t o hav e violate d this Orde r an d t o have faile d o r refuse d t o compl y wit h thi s Order

. Respondent' s writte n notic e shal l describe , usin g facts tha t exis t o n o r prio r t o th e effectiv e dat e o f this Order , an y "sufficien t cause " defense s asserte d b y Responden t unde r section s 106(b ) an d 107(c)(3 ) o f CERCLA , 4 2 U.S.C

. § § 9606(b ) an d 9707(c)(3)

. Th e absenc e o f a respons e b y EP A t o th e notic e 

### require d b y thi s paragrap h shal l not b e deeme d t o b e acceptanc e o f assertion s b y Respondent

.
2

2XXXI

. ORDE R 90

. Based o n th e foregoing , Responden t i s hereb y ordere d t o compl y wit h th e provision s o f thi s Order , includin g bu t no t limite d t o al l attachment s t o thi s Order , al l document s 

### incorporate d b y referenc e int o thi s Order , an d al l schedule s an d deadline s in thi s Order , attache d t o this Order , o r incorporate d 

### b y referenc e int o thi s Order

. I T I S S O ORDERED : ENVIRONMENTA

L PROTECTIO N

AGENCY , REGIO N VII I B Y : 'S

__________________________ DAT E Robert L

. Duprey , Directo r 

### Hazardou s Wast e Managemen t Divisio n

2 3APPENDI X A - WORKPLA

N CHANGE S 

### The changes outline d belo w ar e hereb y mad e i n th e reference d wor k plans , an d wit h thes e changes , th e reference d wor k plan s ar e 

### hereb y approved

. A

. Change s t o Wor k Pla n fo r Samplin g an d Analysi s o f Lea d Occurrenc e i n an d Immediatel y Adjacen t t o Residentia l Areas , Jul y 1991 , Exhibit 2

. 1 ) Th e titl e i s change d t o rea d FINA L SAMPLIN

G PLA N FO R SAMPLIN G AN D ANALYSI S O F LEA D OCCURRENC E WITHI N AN D IMMEDIATEL Y ADJACEN T T O RESIDENCES

. 

### 2 ) Sectio n 2.0 , Pag e 2-1 , Para

. 3 : Befor e "A n effor t wil l 

### b e made... " plac e the language : A minimum o f 10 0 home s wil l b e sample d accordin g t o the protocol s set fort h i n thi s wor k plan

. Thes e 10 0 home s wil l b e 

### representativel y distribute d accordin g t o the ag e o f 

### eac h hom e and it s geographi c locatio n withi n the Populate d Remedia l Investigatio n

Stud y Area

. A minimum o f 50 % o f thes e home s wil l hav e childre n age 6 months t o 7 2 month s i n residence

. The sentenc e beginnin g "A n effor t wil l b e made... " i s change d t o read : 

### Additionally , a n effor t wil l be made..

. . 3 ) Sectio n 4.1.1 , Pag e 4-1 : Creat e a ne w Sectio n 4.1. 1 

### and renumber subsequent sections

. The new sectio n i s entitle d Initia l Visi t an d reads : Befor e samplin g occurs, a n initia l visi t wil l b e conducted

. Th e 

### purpos e o f thi s visi t wil l be t o explai n th e objective s o f EPA' s remedia l investigatio n

an d t o reques t permissio n t o releas e t o EP A th e result s o f sampling

. « 4 ) Sectio n 4.1.3.1 , Pag e 4-7 , Para

. 2 : Ite m No

. 1 is change d t o read : A floo r are a directl y insid e th e mai n entranc e t o th e residence

. 5 ) Sectio n 4.1.3.1 , Pag e 4-8 , Para

. 2 : Ite m No

. 1 i s 

### change d t o read : I f possible , a n additiona l dus t sampl e wil l b e obtaine d from : 1 ) beneat h carpet s an d 2 ) atti c areas . 6 ) Sectio n 4.1.3.1 , Pag e 4-8 , Para

. 2 : Th e firs t sentenc e 

### i s change d t o read : Colocate d sample s wil l b e collecte d fro m 20 % o f th e houses an d wil l be evaluate d fo r speciatio n in accordanc e wit h th e Metal s Speciatio n 

### Work Pla n fo r this study

. 17

) Sectio n 4.1.3.1 , Pag e 4-8 , Para

. 4 : Whe n dus t sample s ar e collected , a tri-directiona l

swee p patter n shoul d b e used where th e second swee p i s i n a directio n 9 0 

### degree s t o th e first , an d th e thir d directio n i s 4 5 degree s fro m th e firs t sweep

. Al l reference s t o this techniqu e throughou t th e wor k pla n shal l be correcte d (e.g. , p

. 4-16 , p

. B-3

. p

. B-17)

. 8 ) Sectio n 4.1.5 , Pag e 4-19 , Para

. 1 : Th e followin g 

### actio n level s shal l b e state d fo r th e analytica l method s - Al l sample s wit h lead detecte d at 2 0 ppr a o r les s shal l b e re-analyze d b y graphit e furnac e atomi c absorptio n . 9 ) Sectio n 4.1.6, Pag e 4-20, Sentenc e 1 : Th e sentenc e is change d t o read: Introduction ,

preliminary

residentia l walk-through , an d reques t t o releas e result s o f EPA

. 

### 1 0 ) Sectio n 6.0 , Pag e 6-1 : Th e second an d thir d sentence s ar e change d t o read : Fo r the minimu m 10 0 home s sample d (the y mus t b e representativel

y distributed

, no les s 

### than 50 % o f them wit h childre n ag e t > It o 7 2 "month s i n residence ) th e environmenta l

samplin g form s containe d in Appendi x A (for m number s 05-08 ) wil l be complete d 

### an d submitte d t o EF A alon g wit h th e result s o f th e samplin g parameter s prescribe d i n th e wor k plan

. Fo r al l othe r home s sampled , i f permissio n has bee n received t o releas e samplin g result s t o EPA , th e form s set fort h i n Appendi x A wil l b e complete d and submitte d t o EP A alon g wit h th e result s o f th e samplin g 

### parameter s prescribe d i n the wor k plan

. 1 1 ) Appendi x B , Sectio n 9A , Pag e B-6 : Thi s procedur e shal l b e modifie d t o includ e th e ful l aci d digestio n o f th e sampl e filte r instea d o f th e filte r was h an d discar d step

. 1 2 ) Appendi x B , Sectio n 9A , Pag e B-8 : Thi s procedur e shal l be modifie d t o include : Al l sample s wit h lead detecte d 

### a t 2 0 pp m o r les s shal l b e re-analyze d b y graphit e furnac e atomi c absorption

. 1 3 ) Appendi x B , Sectio n 9A , Pag e B-20 : Al l analytica l 

### calibratio n procedure s withi n thi s wor k pla n shal l b e modifie d t o includ e a minimu m o f 5 calibratio n points , not 3 a s state d i n paragrap h 7 o f pag e B-20

. 1 4 ) Appendi x B , Sectio n 9B , Pag e B-24 , Table 5-3 : Th e frequenc y o f Calibratio n

Verificatio n

an d Instrumen t Blan k sample s shal l b e 1 pe r 1 0 sample s instea d o f 1p e r

20

. I n addition , th e frequencie s o f Deco n Blan k samples , Duplicat e samples , Replicat e Analysi s samples , a n d Interlaborator y

Spli t sample s vil l b e analyze d ever y 1 pe r 2 0 sample s o r 1 pe r da y vhic h eve r i s mor e 

### frequent

. 

### 1 5 ) Th e wor k pla n shal l b e amende d t o requir e th e us e o f Custod y Seal s o n al l sampl e container s prio r t o transportatio n off-site

. 1 6 ) Appendi x D , Sectio n 5 , Pag e D-3 , Tabl e 1 : Th e Limi t o f 

### Detectio n fo r th e A.A.S

. analysi s shal l b e change d t o 1 p p m (mg/kg)

. 1 7 ) Appendi x D , Sectio n 9B , Pag e D-11 , Table 5-3 : Th e 

### frequenc y o f Calibratio n Verificatio n an d Instrumen t Blan k sample s shal l b e 1 pe r 1 0 sample s instea d o f 1 p e r 20

. I n addition , th e frequencie s o f Decon Blan k samples , Duplicate samples , Replicat e Analysi s samples , 

### a n d Interlaborator y

Spli t sample s vil l b e analyze d ever y 1 pe r 2 0 sample s o r 1 pe r <Ja y whicheve r i s mor e frequent

. B

. Change s t o Min e Wast e Remedia l Investigatio n

Work Plan , Jul y 1991 , Exhibi t 4

. T h e Min e Wast e Pil e Remedia l Investigatio n

Work Pla n is change d a s follows : Withi n 3 0 day s o f th e dat e o f this Order , a flo w diagra m depictin g th e min e wast e pil e samplin g an d evaluatio n 

### proces s an d it s relatio n t o othe r R I procedures , alon g wit h a n accompanyin g narrativ e descriptio n o f tha t sam e process , shal l b e provide d t o EPA

. C

. Change s t o Tailin g Disposa l Are a Remedia l Investigatio n

Wor k Plan , Jul y 1991 , Exhibit 5

. « 1 ) Physica l an d chemica l informatio n characterizin

g Resurrectio n 1 an d Resurrectio n

2 Tailing s (Re s 1 an d Re s 2 ) must be provide d t o EPA

. Unles s suc h informatio n i s presentl y available , a remedia l 

### investigatio n must b e undertake n a t Re s 1 an d Re s 2 consistin g o f th e collectio n o f subsurfac e tailin g 

### samples , collectio n o f groundwate r samples , analytica l testing , an d geotechnica l laboratory testing

. Specifically , thes e activitie s wil l consis t of : a . Drillin g o f thre e tes t holes , two at Re s 1 an d on e a t Res 2, t o foundatio n materia l wit h samplin g fro m th e to p 2 feet , a t abou t 5-foo t intervals

.an d

a t change s i n materia l identifie d durin g drilling

. 

### i

. Tw o tes t hole s wil l be drille d throug h th e burie d tailing a t Re s 1—with on e locatio n a t 

### wha t i s determine d t o b e the thickes t sectio n o f the tailin g and anothe r drille d at wha t i s determine d t o b e an upgradien t locatio n i n t h e tailing

. 

### ii

. On e hol e wil l b e drille d a t Res 2

. Thi s hol e penetrat e wha t i s judge d t o b e the thickes t sectio n o f burie d tailing

. T h e location s o f th e tes t hole s wil l b e establishe d i n th e fiel d base d o n th e sit e reconnaissanc e

an d revie w o f historica l data

. 

### Disturbe d an d relativel y "undisturbed "

sample s in th e tes t hole s wil l b e collecte d ^-usin g shelb y 

### tubes , a n Osterbur g sampler , spli t spoon s (SPT ) o r a Californi a driv e sampler

. Wate r level s wil l b e measure d I n th e Re s 1 tes t hole s durin g drillin g an d 2 4 hour s afte r drilling completio n t o allo w 

### io r stabilizatio n

o f vater levels

. 

### b

. Installatio n

o f monito r wells

. Eac h o f th e hole s wil l b e complete d a s monito r well s i n th e tailing s 

### i f wate r i s encountered

.

Th e well s wil l b e 

### screene d nea r th e base o f th e tailings

. Th e well s wil l b e develope d an d sample d an d th e sample s wil l b e analyze d fo r th e parameter s liste d in Tabl e 2

- 5

. c . Chemica l Analyses

. Al l tailin g an d foundatio n sample s fro m th e Res 2 hol e an d th e deepe r hol e a t Res 1 wil l be analyze d fo r th e parameter s liste d i n Tabl e 2-2.

. The remainin g hol e at Re s 1 wil l b e 

### sample d a t th e followin g depth s an d submitte d fo r chemica l analysis : 

### i

. Withi n 5 fee t abov e groundwate r i n the tailin g i f th e groundwate r i s a t a dept h 

### greate r tha n 1 0 feet

. i i

. Withi n 5 fee t belo w groundwate r iii

. Withi n 5 fee t above th e foundatio n materia l i f th e vertica l distanc e betwee n groundwate r an d th e foundatio n materia l i s greate r tha n 1 0 feet

.i v

.

Withi n th e foundatio n materia l belo w th e tailing

. d

. Geotechnica l

Analyses

. Sample s fro m th e tes t 

### hole s wil l b e teste d fo r physica l parameters

. Th e testin g ma y include : i

. Moistur e content ; AST M D221 6 i i

. We t an d densities ; AST M 0221 6 

### iii

. Particl e siz e distribution ;

AST M D42 1 an d D42 2 iv

. Atterber g limit s (liqui d limi t an d plasticit y index) ; AST M D431 8 

### T h e specifi c geotechnica l

testin g progra m wil l b e establishe d based o n "th e type s o f material s encountered , sample s recovered , an d engineerin g 

### judgment

. Othe r propertie s fo r desig n wil l b e estimate d fro m index propertie s o r collecte d 

### durin g remedia l design , i f needed

. A n amendment t o th e approve d workpla n addressin g th e abov e requirement

s shal l b e submitte d t o EP A n o late r tha n Septembe r 15 , 1991

. 

### 2 ) Investigation s

o f Hecl a tailings

. T h e investigation s

o f Hecl a tailing s specifie d i n Sectio n 2.3.5 , pag e 2-20 , ar e approved

. However , thes e investigation s shoul d no t begi n unti l Septembe r 16 , 1991

. I n th e even t tha t a n administrativ e

orde r o n consen t or unilatera l administrativ e

orde r wit h an approve d wor k pla n fo r stud y o f thes e tailing s is issue d t o Hecla Mining Compan y b y Septembe r 15 , 1991 , 

### thi s sectio n o f th e wor k pla n shal l b e nul l an d void

. D

. Change s t o Surfac e Water , Be d Materia l an d Aquati c Ecosyste m Dat a Collectio n Progra m Wor k Plan , Jun e 1991 , Exhibit 6

. 1 ) Pag e 2-1 , Objectives : Remove th e phrase , "Eliminat e sampling a t station s wher e contaminant s o f concer n ar e 

### not detected. " 2 ) Sectio n 4.2 , Pag e 4-3 : Correc t th e rang e fo r zin c concentration s t o rea d 63 0 - 915 0 mg/1

. 3 ) Tabl e 6-1 : Chang e EP A GFA A metho d fo r lea d t o 239.2 ; Chang e method number fo r p H t o 150.1 ;Chang e metho d numbe r fo r bicarbonat e an d carbonat e t o SM403 ; Chang e metho d numbe r fo r cyanid e t o 335.3

. 4 ) Figur e 6-1 : Modif y sampl e locatio n numberin g syste m t o 

### correspon d t o th e USG S numberin g syste m fo r surfac e wate r samplin g location s o n th e Arkansa s Rive r an d it s tributaries

. 5 ) Tabl e 6-2 ; Ad d detectio n limit s fo r parameter s t o b e 

### analyze d i n be d materia l samples

. Se e Attachmen t I , USEP A Contrac t Laborator y Program , Statemen t o f Work Fo r Inorgani c Analysis , Multi-Media ,

Multi-Concentration , ILM01.0 , July , 1988

. However , th e CRD L i s 

### dependen t o n th e dr y weigh t o f th e sample

. T h e metho d t o determin e sedimen t detectio n limit s i s & s Jollows : (Aqueou s CRDL' s (ug/L ) X 0.200D/ 1 gram tdry)*

. * Dr y weigh t = weigh t X % solid s 

### Antimon y mus t be analyze d usin g th e Furnac e A A analysis , metho d 204.2

. 6 ) SO P 2A , Pag e 6 : Remov e paragrap h 1 , sinc e depth



### integrate d sampling i s no t appropriat e i n th e Arkansa s Rive r Basin

. 7 ) SO P 2A , Pag e 12 , Paragrap h 2 ; Sample s fo r alkalinity , chloride , fluoride , an d cyanid e mus t b e 

### determine d a s total s (i.e. , unfiltered)

. Ad d tha t sample s wil l be checke d fo r th e presenc e 

### o f chlorin e an d sulfide , whic h ma y interfer e wit h th e cyanid e analysis

. 8 ) SO P 2A , Pag e 1 3 an d 14 , Rinsat e Sample s an d Fiel d 

### Blanks : Modif y las t sentenc e t o stat e tha t on e rinsat e sampl e wil l b e collecte d fo r ever y twent y (20 ) water sample s o r onc e a day , whicheve r i s mor e frequent

. 9 ) SO P 4A , Pag e 7 , Wate r Fle a Toxicit y Testing : Modif y tex t t o stat e tha t sample s fro m Californi a Gulc h ma y requir e dilutio n t o 0.2 5 percent , sinc e toxicit y belo w 1 percen t ha s bee n observe d i n previou s studies

. 1 0 ) SO P 4A , Pag e 7 , Fathea d Minno w Toxicit y Testing : 

### Modif y thir d sentenc e t o stat e tha t th e fathea d minno w test s shal l b e conducte d fo rforty-eigh t

(48 ) hour s a t 20°C(+/-2°C)

. 

### Modif y nex t sentenc e t o stat e tha t th e minnow s wil l be fe d 0. 1 millilite r brine shrim p prio r t o selectio n and at 2 4 hours

. 1 1 ) SO P 4A , Pag e 8 , Benthi c Macroinvertebrates ; A d d th e following : "A t station s wher e th e flow s ar e t o o hig h fo r a standar d D-fram e kick-ne t sampler , a kic k screen sample r wil l b e used

. 

### A technicia n wil l be require d t o hol d th e sample r i n plac e whil e a secon d technicia n agitate s th e streambe d surrounde d b y th e sampler

. Sample s wil l b e pu t int o whit e pan s 

### fo r pre-sortin g an d wil l be rinse d throug h a numbe r 3 0 mes h screen prio r t o preservation

. Sample s wil l b e preserve d wit h 95 % ethano l an d place d in non-breakabl

e (i.e. , plastic) containers

. Streamflo w measurement

s wil l b e conducte d concurrentl y wit h sampl e 

### collection. " A d d th e stipulatio n tha t when a benthi c sampl e canno t J b e identifie d t o th e Genu s leve l fo r th e chironomida e Family , th e sampl e wil l b e give n 

### t o EP A fo r identification

. 1 2 ) SO P 4A , Pag e 9 , Fish : Ad d th e sentence , "Fis h ag e wil l als o b e confirme d b y usin g a standar d fis h scal e analysis. " 1 3 ) SO P 4A , Pag e 10 , Fish ; Smal l fis h mus t b e collecte d t o obtai n a minimu m weigh t o f 30 0 - 50 0 grams . 

### A d d copper , chromium an d arseni c t o th e lis t o f parameter s in th e las t paragraph

. 1 4 ) SO P 4A , Pag e 12 , Table 4-1 : Table 4- 1 must b e modifie d as follows :

« 

### A d d a n additiona l samplin g statio n t o sampl e t h e contaminan t plum e a t statio n AR- 3 fo r al l parameters

. Th e station s shoul d b e labele d

. a s AR-3 E and AR-3 W t o indicat e east and wes t bank

. A d d a surfac e wate r samplin g statio n downstrea m o f 

### AR-3

. Immediatel y abov e th e confluenc e o f Hal f Moo n Creek should * b e th e approximat e location

. A d d Statio n EM-2 , EM-3 , an d EM- 4 t o b e sample d fo r fis h (tota l o f 1 5 fis h samplin g stations)

.A d

d a n additiona l statio n o n Californi a Gulc h upstrea m o f th e Ya k Tunne l discharg e t o th e lis t o f Benthi c samplin g stations

. A d d station s IG-1 , HC-1 , LF-1 , an d EF- 1 t o th e toxicit y testin g lis t (tota l o f 1 9 toxicit y testin g 

### stations)

. 1 5 ) A stor m even t surfac e vate r samplin g progra m must b e implemente d durin g th e summer o f 1991

. Attachmen t 2 i s a minimu m requirement

s progra m tha t mus t b e incorporate d int o the sampling program

. Ad d languag e regardin g th e 

### stor m even t samplin g progra m indicatin g tha t E F A wil l be notifie d ever y tim e tha t a stor m 

### even t sampl e i s collected

.I' 

### ATTACHMEN T I (pa^ e 1 o f 1 ) MULTI-MEDIA , MULTI-CONCENTRATIO N 

### JULY

. 198 8 TARGE

T ANALYT E LIS T

ntimon y » Araenic • 'Beryllim n Cildoa

- • C*trOB31IH Q Compel •Iron

La d NOTE : iiAQUEOU

S' :,-:CRD L - r (ug/L,ppb ) 20 0 6 0 1 0 20 0

500 0 1 0 5 0 2 5 10 0 (mg/Kg.ppm ) 4 0 1 2 4 0

100 0 1 0 2 0 0. 6 Masgiaes e Mercer y Nicke l Potassium Saver 'Sodio m

A N D WIL L B E HIGHE R THA N THOS E LISTED 500

0 I S 0. 2 4 0 500 0
1 0 500 0 1 0 100 0 0. 1
100 0

100 0ATTACHMEN T 2 MINIMU M REQUIREMENT S FO R A STOR M EVEN T SAMPLIN G PROGRA M FO R SURFACE WATE R A T TH E CALIFORNI A GULCH SIT E 

### Purpos e T h e stor m even t sampling progra m i s designe d t o determin e t h e chemica l loadin g o f metal s t o th e Arkansa s Rive r fro m Californi a Gulc h durin g a rainfal l stor m event

. Th e dat a wil l serve a s a preliminar y determinatio n

o f th e effect s o f a stor m even t o n th e aquati c biot a i n th e surfac e water

. The result s wil l als o be used t o determin e whethe r a detaile d stor m even t monitorin g progra m wil l b e designe d fo r Californi a Gulc h Sit e i n 

### t h e future

. F o r purpose s o f thi s monitorin g program * a stor m even t i s define d a s a rai n even t tha t result s i n a t a minimu m o f 0. 1 inche s o f rainfal l t o a surface

. Dat a Qualit y Objective s Th e dat a qualit y objectiv e o f th e storm even t surfac e wate r 

### dat a collectio n i s t o collec t dat a o f sufficien t qualit y t o determin e the change s i n wate r colum n chemistr y and possibl e impact s t o aquatic biot a i n th e Arkansa s Rive r fro m Californi a Gulc h durin g stor m events

. Th e dat a wil l be use d t o determin e th e chemica l loadin g o f metal s durin g a stor m even t t o th e Arkansa s River

. Othe r potentia l use s o f th e dat a include : o environmenta l

baselin e ris k assessment ; o surfac e wate r modelin g o f contaminan t transpor t fro m Californi a Gulch ; 

### o and , screenin g an d evaluatio n o f remedia l measures . * Parameter s 

### flo w coppe r p H iron conductivit y lea d tota l suspende d sedimen t magnesiu m arseni c manganes e cadmiu m silve r calciu m zinc Toxicit ySampl

e Location s CG6 : Californi a

Gulc h abov e th e confluenc e wit h th e Arkansa s River ; 

### AR2 : Arkansa s Rive r upstrea m o f Californi a Gulch ; AR3E : Eas t Ban k o f th e Arkansa s River downstrea m o f 

### Californi a Gulch ; AR3A: Arkansa s

River downstrea m o f AR3E

. Frequency 

### Sample s mus t b e collecte d durin g rainfal l stor m event s tha t occu r betwee n Augus t 1 , 199 1 an d Septembe r 30 , 1991

. Th e samplin g interva l durin g th e stor m even t shoul d be designe d t o captur e sample s i n the rang e o f ever y 1 5 Tni?mite* s t o one hal f hour

. Instrumentatio n Sample s mus t b e collecte d usin g precipitation-activate d 

### sampler s or b y personne l locate d nea r the sit e directe d t o collec t sample s whe n a stor m even t tha t result s i n 0. 1 in

. or 

### mor e o f precipitatio n

occurs .