# ADMINISTRATIV E RECOR D 28795

0 Exhibi t 3 RECOR D OF DECISIO N MODIFICATION Y A K TUNNE L OPERABL E UNI T CALIFORNI A GULCH SITE , LEADVILLE , COLORAD O f t

p Thi s documen t set s forth change s i n th e Declaratio n

an d Decisio n Summar y fo r th e Recor d o f Decisio n (ROD ) fo r th e Ya k Tunne l Operabl e Uni t o f th e Californi a Gulc h Sit e signe d o n Marc h 2 9 , 1988

. DECLARATIO N FO R TH E RECOR D O F DECISIO N 1

. Delet e page s 2 an d 3 in thei r entiret y an d th e firs t ful l paragrap h o n pag e 4

. I n thei r place , substitut e th e followin g language : 1

. A surg e pon d or pond s t o collec t flo w fro m th e Ya k Tunne l an d suppor t treatmen t plan t operations ; 2

. Concret e plug s at a minimu m o f thre e location s withi n th e tunne l t o floo d th e sulfid e zones , t o hal t t h e uncontrolle d

discharg e o f tunne l effluen t t o Californi a Gulch , an d t o preven t surges ; 3

. Wate r contro l measure s t o reduc e surfac e wate r inflo w int o th e tunne l syste m an d t o minimiz e uncontrolle d groun d wate r outflo w fro m th e tunne l syste m followin g plugging , a s necessar y fo r prope r performanc e o f th e remedy ; 4

. A monitorin g progra m t o establis h baselin e preremediatio n

wate r qualit y an d t o predic t an d evaluat e hydrologi c changes ; 5

. A wate r collectio n syste m t o collec t wate r fro m behin d th e porta l plug ; 6

. A wate r treatmen t facilit y t o trea t a l l flo w fro m th e Ya k Tunne l prio r t o releas e t o Californi a Gulch ; 7

. Operation s

and maintenanc e

o f the selecte d remedy ; an d8

.

A contingency pla n t o addres s an y 

### advers e hydrologi c change s resultin g fro m tunne l plugging

. 2

. Delet e th e fift h an d sixt h sentence s i n th e fourt h paragrap h o n pag e 4

. I n thei r place , substitut e th e followin g sentence : Thi s

remed y i s onl y a firs t ste p towar d cleanu p o f Californi a Gulc h surfac e wate r an d 

### i s par t o f a tota l remedia l actio n fo r th e site

. DECISIO N SUMMAR Y 1

. Throughou t th e Decisio n Summary , substitut e th e ter m "water treatmen t facility " whereve r th e ter m "interi m treatmen t facility " appears

. 2

. Delet e th e descriptio n o f th e selecte d remed y o n page s 34-35

. I n it s place , substitut e th e followin g language : o A surg e pon d or ponds ; 

### o Tunne l plugs ; o Wate r contro l measures ; 

### o A wate r treatmen t facility ; o A monitorin g program ; 

### o A contingency plan ; an d

o Operation s

and maintenance

. 3

. I n th e firs t sentenc e i n th e secon d ful l paragrap h o n pag e 38 , delete th e word s "t o near zero"

. 4

. Delet e th e firs t ful l paragrap h o n pag e 40 , an d substitut e th e followin g language : Becaus e o f th e concer n about uncontrolle d seepag e shoul d floodin g occur behin d th e porta l plug , th e porta l plu g wil l b e designe d primaril y fo r surg e contro l an d wil l incorporat e a pumping o r draining mechanis m f o r norma l flow

. Wate r flowin g throug h th e tunne l t o th e porta l plu g wil l b e pumpe d o r draine d fro m behin d th e plu g t o th e treatmen t plant

. Detail s o f th e treatmen t syste m ar e discusse d late r i n more detail

.5

.

Afte r th e thir d ful l paragrap h o n pag e 40 , ad d th e followin g language : Wate r contro l measures nee d b e constructe d 

### onl y t o th e exten t necessar y fo r cost

effectiv e short

- an d long-ter m performanc e

o f the remed y and a s neede d t o protec t huma n healt h an d th e environment

.

Reducin g 

### infiltratio n o f surfac e waters t o th e Ya k 

### Tunne l behin d th e porta l plu g ma y lead t o mor e consisten t tunne l flo w an d wate r qualit y whic h ma y i n tur n lea d t o mor e cost



### effectiv e treatmen t plan t operations

. Wate r contro l measures relate d t o th e othe r plug s 

### ma y reduc e th e potentia l fo r advers e wate r qualit y movement an d ma y reduc e th e long-ter m cos t o f a pump-and-treatmen t

system , shoul d 

### problem s occur . 6

. Delet e th e ter m "Wate r Collectio n an d Interi m Treatment " a n d th e thir d ful l paragrap h o n pag e 41 , pag e 4 6 i n it s entirety , a n d th e firs t tw o paragraph s o n pag e 47

. I n thei r place , substitut e th e followin g language : 

### Wate r Treatmen t Facilit y A s discusse d above , a treatmen t facilit y wil l b e buil t t o trea t flo w fro m th e Yak Tunnel

. T h e treatmen t facilit y wil l b e constructe d an d operationa l befor e entr y int o th e tunne l f o r remedia l design

. I t wil l the n b e 

### operate d continuousl

y t o trea t al l flo w fro m th e tunnel

. Onc e th e plug s ar e constructed

, th e facilit y 

### wil l trea t wate r drainin g throug h th e porta l plug

. Wate r level s behind th e porta l plu g wil l b e controlle d b y pumpin g o r b y a 

### speciall y designe d flow-throug h

syste m havin g a n upstrea m inver t elevatio n equa l t o the leve l o f th e base o f th e Ya k Tunne l a t tha t 

### point

. A monitorin g syste m wil l be installe d behin d th e plu g t o assur e tha t an y flow

- throug h syste m i s operatin g properl y an d tha t 

### wate r level s ar e no t risin g behin d th e plug

. Afte r installatio n

o f th e tw o upgradien t plugs , th e averag e flo w rat e fro m th e porta l plu g wil l b e approximatel

y 28 5 gpm

. 

### T h e treatmen t facilit y wil l incorporat e lim e treatmen t an d th e us e o f hig h densit y sludg e (HDS ) technolog y supplemente d

wit h a chemica ladditio n

t o assis t i n th e remova l o f cadmium

. The surg e pon d wil l b e use d a s an 

### equalizatio n pon d t o minimiz e variation s i n flo w rat e an d chemistr y o f th e water fo r th e 

### treatmen t plant

. Th e desig n o f th e facilit y wil l b e a s flexible a s possibl e t o permi t integratio n o f th e facilit y wit h treatmen t need s associate d wit h th e contingenc y pla n 

### describe d belo w an d additiona l remedia l action s fo r th e Californi a Gulc h site

. T h e treatmen t proces s wil l resul t i n th e generatio n o f sludge

. Sludg e produce d b y conventiona l lim e softening i s ver y difficul t 

### t o dewate r du e t o it s dilute , non-dense , non filterabl e characteristics

.

HD S technolog y circulate s th e precipitate s

cause d b y lim e softening t o produc e discrete , dense r 

### particle s tha t ar e mor e free-drainin

g an d filterable

. Th e recycle d sludg e particle s can the n b e dewatere d i n a filte r pres s and subsequentl y bagge d fo r disposal

. Disposa l 

### o f th e sludg e wil l eithe r b e throug h resourc e recover y t o recover zin c an d possibl y othe r metal s o r i n a n appropriat e landfil l eithe r on-sit e o r off-site

. Th e requirement

s 

### governin g sludg e disposa l ar e discusse d in Appendi x C

. 7

. Delet e th e ter m "Contingenc y

Plans " betwee n th e secon d an d thir d paragraph s

o n pag e 47

. I n it s place , substitut e th e ter m "Contingenc y

Plan"

. 8

. Ad d th e followin g languag e afte r th e fourt h paragrap h o n pag e 47 : Othe r measure s ma y als o b e necessar y t o 

### addres s any advers e effect s associate d wit h tunne l plugging

. Suc h measures wil l b e incorporate d int o a contingenc y pla n t o addres s an y impact s du e t o floodin g resultin g fro m plugging

. 9

. Delet e th e firs t sentenc e i n th e las t paragrap h o n pag e 4 7

. I n it s place , substitut e th e followin g language : 

### Wate r contro l measure s wil l b e maintaine d a s necessar y t o ensur e cost-effectiv e performanc e o f th e remedy

. 1 0

. Delet e th e title an d tex t o f th e secon d paragrap h o n pag e 48

. I n it s place , substitut e th e followin g language :

### Wate r

Collectio n an d Treatmen t Facility

. Routin e repai r o r replacemen t o f pumps , motors , mixers , clarifie r rakes , piping , filter s an d tankag e wil l be required

. 

### Inspectio n an d repai r o f an y porta l flow

- throug h devic e an d drainag e syste m t o th e equalizatio n pon d wil l als o be necessary . 

### T h e equalizatio n

pon d line r wil l b e visuall y inspecte d an d th e leakag e detectio n syste m monitore d regularly

. Pon d dikes , fencing , 

### barge , barg e pump s an d pipin g wil l als o requir e routin e inspectio n an d maintenance

. Electrica l powe r i s require d fo r pumpin g an d treatmen t operations

. Lime , flocculant s an d reagent s wil l b e consume d i n th e treatment , collectio n an d shipmen t o f sludg e produce d fro m th e treatmen t plant

. 1 1

. Delet e th e firs t sentenc e i n th e fourth paragrap h o n pag e 48

. I n it s place , substitute : T h e estimate d capita l cos t o f th e selecte d remed y i s $12,763,74 2

an d th e present-wort

h 

### estimat e usin g a te n percen t discoun t rat e i s $23,835,663

. 1 2

. Delet e th e secon d an d thir d sentence s i n th e fourth , paragrap h o n pag e 49.

- I n thei r place , substitut e th e followin g language : I t i s estimate d tha t installatio n

o f th e Ibex-Iren e an d Resurrectio n

plug s coul d 

### reduc e th e flo w fro m th e Ya k Tunne l syste m t o Californi a Gulc h b y approximatel

y 5 0 percent

. I t is anticipate d

tha t th e remainin g flo w 

### wil l b e treate d t o reduc e meta l load s i n wate r discharge d t o Californi a Gulc h b y 9 0 t o 9 5 percent

. 1 3

. Delet e th e las t ful l sentenc e o n pag e 49

. 1 4

. Delet e th e word s "an d grouting " fro m th e secon d sentenc e o f th e secon d ful l paragrap h o n pag e 50

. 1 5

. Delet e th e third , fourth , an d fift h sentence s i n th e secon d ful l paragrap h o n pag e 50

. I n thei r place , substitut e th e followin g language : 

### T h e wate r treatmen t proces s wil l creat e a sludg e whic h ma y be processe d fo r resourc e recover y an d thu s eliminat e th e nee d fo r lan d 

### disposal

. I f lan d disposa l i s necessar y fo r

### som

e o r al l o f th e sludg e produced , th e amoun t o f materia l an d it s toxic propertie s wil l b e minimized

. 1 6

. I n Table 6 , pag e 51 , unde r Surfac e Wate r Impacts , i n t h e mitigatio n measur e fo r "Impact s o n floodplain s fro m constructio n o f th e interi m treatmen t facility an d pond s belo w Y a k Tunnel" , substitut e th e ter m "500-yea r flood " fo r th e ter m 

### "100-yea r flood"

. 1 7

. I n Tabl e 6 , pag e 51 , unde r Othe r Impacts , delete th e mitigatio n measur e fo r "Los s o f lan d associate d wit h constructio n 

### o f interi m treatmen t facility " o n pag e 51

. I n it s place , substitut e th e followin g language : T h e los s o f lan d wil l b e minimize d t o th e 

### exten t practicable

. 1 8

. Delet e th e word s "interi m treatmen t facility " fro m th e las t partia l sentenc e o n pag e 51

. I n it s place , substitut e th e 

### word s "selecte d remedy. " 1 9

. Delet e th e phras e "excep t fo r th e interi m treatmen t facility " o n th e to p lin e o f pag e 53

. 2 0

. Delet e th e firs t throug h fourth sentence s i n th e firs t partia l paragrap h o n pag e 53

. I n thei r place , substitut e th e followin g language : 

### T h e wate r treatmen t facilit y wil l b e sized , designed , an d site d t o permit , t o th e exten t practicable , it s integratio n int o a full

- sit e remedy

. 2 1

. Delet e th e las t sentenc e fro m th e secon d ful l paragrap h 2 o n pag e 53

. 2 2

. Delet e th e las t sentenc e i n th e firs t partia l paragrap h o n pag e 54

. 2 3

. Delet e th e word "final " fro m th e secon d sentenc e i n th e thir d paragrap h o n pag e 54

. 24

. Delet e th e word "interim " fro m th e sixt h sentenc e i n t h e firs t ful l paragrap h o n pag e 56

. APPENDI X A 1

. Table A- 2 ha s bee n revise d t o reflec t th e modification s i n th e porta l plug

. Substitut e th e attache d Tabl e A-2

. 2

. Figure s A. 7 an d A. 8 hav e been modifie d t o reflec t th e modifie d remedy

. Substitut e th e attache d figures

.3

.

Delet e th e section s title d "Selecte d Remedy , Blac k Clou d Pumping " an d "Selecte d Remedy , Blac k Clou d No t Pumping " o n page s A-1 3 an d A-14

. I n thei r place , substitut e th e followin g language : SELECTE D

REMEDY , BLAC K CLOU D PUMPIN G 

### Afte r installatio n

o f th e Resurrectio n

an d 

### Ibe x plug s an d th e porta l flow-throug h

plug , th e Yak Tunne l porta l flo w wil l b e reduce d t o abou t 28 5 gp m (Figur e A.7)

. Th e propose d locatio n o f th e plug s i s show n i n Figur e A

. 4

. Wate r level s in th e Resurrectio n

an d Ibe x Group s woul d increas e t o approximatel

y 10,75 0 

### fee t an d 10,65 0 fee t mea n se a leve l (msl) , 

### respectively

. Sulfid e roc k woul d stil l b e presen t abov e the wate r tabl e and som e acidic min e drainag e formatio n woul d persist

. Dee p groun d wate r flo w woul d tota l approximatel

y 9 0 gp m an d inflo w t o Black Clou d woul d b e 

### abou t 31 5 gpm

. Groun d wate r seepag e towar d th e Leadvili e Drainag e Tunne l an d loca l seep s woul d b e abou t 1 0 gp m each

. Wate r level s i n th e Iro n Hil l Grou p woul d remai n a t th e current leve l o f 10,35 0 msl

. 

### Change s in wate r leve l behin d th e porta l plu g are not anticipate d since the water leve l wil l b e controlle d eithe r b y pumpin g or b y 

### usin g a speciall y designe d flow-throug h

plug maintaine d a t a n elevatio n equa l t o th e invert elevatio n o f th e flow-throug h

devic e 

### a t th e floo r o f th e Ya k Tunne l a t th e porta l plu g location

. Th e plu g wil l preven t surges fro m occurrin g du e t o tunne l deterioration , bu t wil l allo w normal wate r flo w o f abou t 28 5 gp m t o drain t o th e treatmen t plant

. 

### Minimizin g th e inflo w o f surfac e wate r t o th e Y a k Tunne l ma y be neede d fo r optima l managemen t o f th e treatmen t plan t operations

. 

### I f so , th e followin g area s wil l probabl y nee d grouting : 1 ) strea m channelizatio n

where 

### Californi a Gulc h flow s ove r th e near-surfac e undergroun d min e working s tha t connect t o th e Y ak Tunnel ; 2 ) alon g an d t o th e wes t o f th e 10,35 0 foo t contour ; an d 3 ) i n th e are a 

### overlyin g th e undergroun d min e workings immediatel y t o th e nort h o f th e Yak Tunne l portal

. 7SELECTE D

REMEDY , BLAC K CLOU D NO T PUMPIN G Whe n th e Black Clou d min e i s no t pumpin g an d 

### th e Resurrection ,

Ibex , an d porta l plug s ar e 

### i n place , th e wate r level s i n th e Iren e Grou p woul d increas e t o approximatel

y 10,80 0 fee t msl , whil e thos e in th e Resurrectio n

Grou p woul d increas e t o 10,90 0 fee t msl

. However , 

### acidi c min e drainag e woul d likel y stil l occu r i n thes e area s becaus e som e sulfide rock s 

### woul d stil l be exposed

. Th e wate r leve l i n t h e Iro n Hil l Grou p woul d no t b e affected

. T h e tota l dee p groun d wate r seepag e fro m al l min e working s woul d increas e t o abou t 11 5 gp m 

### an d increas e th e porta l flo w t o abou t 32 0 gpm

. N o increase d surfac e seepag e t o Californi a Gulc h is anticipated

.

A n 

### additiona l seepag e o f roughl y 1 5 gp m fro m th e Resurrectio n Grou p towar d th e Evan s Gulc h are a coul d occur . Du e t o it s smal l quantity , 

### this seepag e i s no t expecte d t o caus e an y significan t groun d wate r qualit y 

### deterioratio n in th e Evan s Gulc h area . Th e monitorin g network , whic h show s bot h ground 

### wate r flo w an d qualit y conditions ,

wil l provid e informatio n t o track this condition

. APPENDI X B 1

. Delet e Table s B- 2 an d B-3

. attached

. T h e modifie d table s ar e 2

. Delet e th e sectio n "Compariso n

wit h Cos t Figure s i n FS " o n pag e B-4

. I n it s place , substitut e th e followin g language : COMPARISO N WIT H COS T FIGURE S I N F S AN D RO D T h e basi s o f this estimat e i s generall y 

### simila r t o tha t develope d i n th e FS

. Exception s primaril y includ e th e groutin g an d monitorin g program s outline d above

. Th e cos t 

### associate d wit h th e surg e pond , whic h has alread y bee n constructed

, wa s provide d b y th e Res-ASARC O Join t Venture

. Th e cos t include s 

### pum p structures , drainage , by-pas s channels , fencing , pon d pumps , dams , lea k detection , 

### filters , pon d barge , etc

. Becaus e th e pon d i s i n place , the scop e and bi d contingencie s wer e reduce d fro m 3 5 percen t (in th e Marc h 29 , 1988 , ROD ) t o 2 0 percent

.Engineerin g experienc e o n simila r project s wa s use d t o estimat e cost s fo r th e plu g drain mechanis m an d fo r rehabilitatio n

o f th e firs t 150 0 fee t o f th e Yak Tunne l t o th e porta l 

### plug location

. Cost s include d mucking , sludg e disposal , lighting , an d ventilation

. T h e capita l cost s an d annual O& M cost s ar e shown in Tabl e B-2

. Th e presen t wort h analysi s a t 1 0 percent , 5 percen t an d 3 

### percen t discoun t rate s i s shown i n Tabl e B

3

. APPENDI X C 1

. Ad d t o th e tabl e o f content s th e followin g language : V

. SUMMAR Y O F ARAR S A

. Waive r o f ARAR s B

. ARAR s fo r Subsequen t Operabl e Unit s 2

. Throughou t Appendi x C , substitut e th e ter m "water treatmen t facility " whereve r th e ter m "interi m treatmen t facility " appears

. 3

. Inser t th e followin g languag e afte r th e indente d quotatio n o n pag e C-9 : 

### T h e State ha s als o identifie d th e "Tabl e Values " in 5 Cod e Colo

. Regs

. 1002-8 , whic h 

### se t concentration s

fo r variou s parameter s based o n aquatic lif e studies , as ARAR s t o th e exten t tha t the y ar e mor e stringen t tha n ambient wate r qualit y criteria

. 4

. Delet e th e las t sentenc e o n pag e C-9

. 5

. A t th e en d o f th e firs t ful l paragrap h o n pag e C-13 , inser t th e followin g language : I n addition , i n accordanc e wit h th e Wate r Resources Counci l "Floodplai n Managemen t Guidelines, " t o th e exten t tha t portion s o f 

### th e remed y coul d b e considere d a s a critica l action , th e remed y wil l b e desig n fo r th e 50 0 yea r floo d event

. 6

. Delet e th e word "no " in th e firs t sentenc e o f th e secon d 

### paragrap h o n pag e C-15

.7

.

Substitut e th e word "applicable "

fo r th e wor d "ARARs " i n t h e fift h sentenc e o f th e secon d paragrap h o n pag e C-15

. 8

. Afte r th e secon d paragrap h o n pag e C-15 , inser t th e followin g languag e a s a ne w paragraph : 

### I n addition , th e Colorad o Mine d Land Reclamatio n Act , contain s additiona l provision s whic h ma y b e relevan t an d 

### appropriat e t o plugging activities

. Th e State ha s identifie d subsection s

(b) , (c) , (d) , (e) , (g) , an d (i) of Colo

. Rev

. Stat

. § 34-32-116(7

) (198 8 Supp. ) an d th e 

### correspondin g sections o f Rul e 6 o f th e Minera l Rule s an d Regulation s o f th e Colorad o Mine d Lan d Reclamatio n

Boar d revise d a s o f 

### Novembe r 198 8 a s relevan t an d appropriate

. 9

. A t th e en d o f th e thir d paragrap h o n pag e C-15 , ad d th e followin g sentence : I n addition , subsection s

(b) , (c) , (d) , (e) , (g) , an d (i ) o f sectio n 34-32-116(7

) o f th e Colorad o Mine d Lan d Reclamatio n

Ac t an d th e 

### correspondin g rule s contai n additiona l provision s whic h ma y b e relevan t an d appropriat e t o implementatio n

o f this 

### componen t o f th e remedy

. 1 0

. Inser t th e followin g paragrap h a t th e en d o f th e firs t partia l paragrap h o n pag e C-16 : T h e Stat e ha s als o identifie d th e prospectin g requirement s o f th e Minera l Rule s an d Regulation s of

. th e Colorad o Mine d Land 

### Reclamatio n Boar d a s a n ARAR

. The requirement s in Rul e 5.3.1 , 5.3.2 , 5.3.7 , 

### 5.4.1 , 5.4.3 , an d 5.4. 5 contain substantiv e requirement s pertainin g t o drilling activities

. 1 1

. Delet e th e secon d sentenc e i n th e secon d ful l paragrap h o n pag e C-16

. 1 2

. Substitut e th e phras e "an y pumpin g o r collectio n 

### systems constructe d a s par t o f th e remedy " fo r th e phras e "th e collectio n system " i n th e fourt h sentenc e o f th e secon d ful l paragrap h o n pag e C-16

. 1 3

. Afte r th e secon d ful l paragrap h o n pag e C-17 , inser t t h e followin g language : 1

0

### I

n additio n t o technology-base d

standards , 

### unde r sectio n 30l(b)d)(C )

o f th e Clea n Wate r Act , 3 3 U.S.C

. § 1311(b)(1)(C) ,

water treatmen t facilitie s ma y b e require d t o mee t 

### mor e stringen t wate r quality-base d

effluen t limitation s an d standards

. Wate r quality

based effluen t limitation s

ar e impose d whe n 

### necessar y t o assur e attainmen t o f State water qualit y standards

. A s discusse d in Sectio n 

### III(C) , th e State' s wate r qualit y standard s includ e tabl e value s an d a narrativ e standar d prohibitin g discharge s "in amounts , concentrations ,

or combination s

whic h are harmfu l t o th e beneficia l use s o r toxic t o 

### humans , animals , plants , o r aquatic life. " S e e Sectio n 3.1.11(d)

.

Thi s "n o toxic materia l i n toxi c amounts " narrativ e standar d i s a n ARA R fo r th e effluen t discharge d

fro m 

### t h e treatmen t plant

. 

### I t i s EP A polic y t o implemen t wate r quality

based effluen t limitations ,

includin g th e 

### narrativ e "no toxi c material s i n toxi c amounts " prohibitio n containe d in al l Stat e standard s throug h a n integrate d strategy 

### consistin g o f bot h biologica l an d chemica l methods

. Se e EPA , Developmen t o f Wate r Quality-Base d Permi t Limitation s fo r Toxi c Pollutants ; Nationa l Policy , 4 9 Fed

. Reg

. 

### 9,016-9,01 9 (1984)

. Th e strategy outline d i n this polic y an d relate d EP A guidanc e wil l be 

### use d t o se t effluen t limitation s

fo r th e treatmen t facilit y based o n attainmen t o f th e narrativ e standar d an d specifi c chemica l goals

. 

### Initially , th e treatmen t facilit y wil l b e require d t o attai n a n effluen t limitatio n 

### based o n acut e toxicit y testing

. Whe n additiona l cleanu p o f Californi a Gulc h o r th e uppe r Arkansa s River i s achieved , th e 

### operativ e effluen t limitatio n wil l b e modifie d t o protec t aquatic lif e fro m chroni c toxicity

. 1 4

. Inser t th e citatio n "122.22(b)-(d) "

betwee n 122.2 1 an d 122.4 1 i n th e fourt h sentenc e i n th e thir d ful l paragrap h o n pag e C-17

. 1 5

. Afte r th e fourt h sentenc e i n th e thir d ful l paragrap h o n pag e C-17 , ad d th e followin g sentence : 1 1

### T

o th e exten t tha t collectio n o f aquatic lif e i s necessar y fo r biologica l monitoring ,

th e Stat e requirement

s governin g th e collectio n o f wildlif e fo r scientifi c purpose s mus t b e met

. Se e 2 Colo

. Cod e Regs

. 406-8, ch

. 13, art

. Ill , sectio n 1316

. 1 6

. Delet e Sectio n G o n page s C-1 7 t o C-1 9 i n it s entirety , 

### I n it s place , substitut e th e followin g section : G

. Managemen t o f Sludg e an d Excavate d Soil s Durin g th e cours e o f constructio n

an d operatio n o f th e selecte d remedy , material s wil l be produce d whic h wil l requir e storag e 

### o r disposal

. Thes e material s includ e sludge s fro m th e surg e pon d an d wate r treatmen t 

### facilit y an d excavate d soils

. Th e management 

### o f eac h typ e o f materia l i s describe d below

. 1

. Sludge s T h e selecte d remed y wil l produc e tw o type s o f sludges : surg e pon d sludg e an d treatmen t 

### facilit y sludge

. Th e surg e pon d syste m serve s a s a settlin g pon d an d wil l contain 

### sludge s an d sediment s that settl e i n the pond durin g it s operation

. Th e wate r treatmen t facilit y wil l produc e a high densit y sludge

. T h e ARAR s var y dependin g o n th e 

### characteristic s

o f th e sludg e an d th e management techniqu e selected

. Th e first, ste p i s t o determin e i f th e sludg e i s a hazardou s wast e in accordanc e wit h 4 0 C.F.R

. § 262.11

. A s th e characteristic s

o f th e 

### sludge s ma y vary , the sludge s mus t b e analyze d i n accordanc e wit h 4 0 C.F.R. 8 264.13

. Th e ARAR s fo r hazardou s waste s an d non-hazardou s waste s ar e describe d below

. a . Hazardou s Waste s 

### I f th e sludg e i s a hazardou s waste , it mus t b e stored , transported

, and dispose d o f i n complianc e wit h Subtitl e C o f RCRA an d an y 

### mor e stringen t State requirements

.

Th e specifi c requirement

s depen d o n whethe r th e sludg e i s manage d on-sit e o r off-site

. Fo r on-sit e storag e an d disposal , a permit i s not required , but the substantiv e requirement s o f 4 0 C.F.R

. Part 264 , Subpart s 1 2

### B ,

C , D , E , F , an d G , an d an y mor e stringen t Stat e requirement

s ar e ARARs

. Dependin g o n 

### th e metho d o f storag e o r disposal , th e followin g requirement

s an d an y mor e stringen t State requirement

s woul d als o b e ARARs : 

### container s (Subpar t I) , surfac e impoundment

s (Subpar t K) f 

### o r landfill s (Subpar t N)

. 

### Disposa l woul d als o b e governe d b y the lan d disposa l restriction s

establishe d

i n 4 2 

### U.S.C

. § 6924(d)

. I n addition , th e location



### specifi c requirement

s discusse d abov e woul d als o b e ARARs

. Off-sit e transportation ,

storage , an d disposa l mus t b e conducte d i n complianc e wit h a l l applicabl e laws

. I f th e materia l i s t o 

### be dispose d o f offsite , i t mus t be dispose d o f i n accordanc e wit h sectio n 12l(d)(3 ) o f CERCLA , 4 2 U.S.C

. § 9621(d)(3)

. 

### b

. Non-hazardou s

Waste s 

### I f th e sludg e i s no t a hazardou s waste , it must be stored , transported

, an d dispose d o f 

### i n complianc e wit h Subtitl e D o f RCRA an d an y 

### mor e stringen t State requirements

.

Again , th e specifi c requirement

s depen d o n whethe r 

### th e sludg e i s manage d on-sit e o r off-site

. F o r on-sit e storag e an d disposal , in additio n 

### t o th e location-specifi c

requirement

s discusse d above, provision s o f bot h Federa l an d State wast e managemen t ar e ARARs fo r 

### storag e o r disposa l o f sludge

. Th e Federa l Criteri a fo r Classificatio n

o f Soli d Wast e Disposa l Facilitie s an d practices , 4 0 C.F.R

. 

### Par t 257 , establishe s minimu m criteri a fo r 

### surfac e water , groun d water , air , an d safety

. 4 0 C.F.R

. section s 257.3-3 , .3-4 , .3-7 , .3

- 8

. I n addition , sectio n 30-20-11 0 o f th e 

### Stat e Soli d Waste s Disposa l Site s an d Facilitie s Ac t an d sections 2.1 , 2.2 , 2.4 , 4.1 , 4.2 , 6.1 , 6.2 , 6.3 , 6.4 , 6.5 , 6.6 , 6.7 , 6.8 , 6.9 , an d 6.1 0 o f th e State Soli d Wast e Disposa l Site s an d Facilitie s Regulation s 

### establis h furthe r requirement

s fo r wast e disposal

. Se e 6 Colo

. Cod e Regs

. 1007-2

. 

### T h e followin g regulation s

ar e als o ARARs fo r managemen t o f treatmen t facilit y sludge : 4 0 C.F.R

. sectio n 264.13(a)(1)-(a )

(genera l wast e analysis) , 264.1 4 (security) , 264.1 5 1 3(genera l

inspectio n requirements) ,

an d 264.3 1 

### (desig n an d operatio n o f facility)

. I n addition , certain provision s governin g landfill s woul d als o b e ARARs : 4 0 C.F.R

. 

### sectio n 264.30 1 (desig n an d operatin g requirements) ,

264.303(a ) (monitorin g an d inspection) , an d 264.30 9 (surveyin g an d 

### recordkeeping)

. Off-sit e transportation ,

storage , an d 

### disposa l mus t b e conducte d i n complianc e wit h a l l applicabl e laws

. I f th e materia l is t o be dispose d o f offsite , i t mus t be dispose d o f i n accordanc e wit h sectio n 121(d)(3 ) o f CERCLA , 4 2 U.S.C

. S 9621(d)(3)

. 2

. Excavate d Soil s an d Debri s 

### Durin g constructio n

o f th e remedy , ther e ma y b e excavation s or activitie s whic h generat e 

### soil s an d debri s requirin g disposal

. Ther e ar e tw o option s fo r disposa l o f this 

### material

. First , th e materia l ma y b e manage d i n the sam e manne r a s the sludge s describe d 

### above

. Second , the materia l can b e consolidate d onsit e wit h a n existin g wast e 

### pil e fo r remediatio n in a subsequen t operabl e 

### unit , provide d tha t th e soil s an d debri s ar e stabilize d t o preven t migratio n o f hazardou s substances , pollutants , o r contaminants

. Specifically , i t wil l be necessar y t o contro l run-on , run-off , an d fugitiv e dust

. Therefore , 4 0 C.F.R

. section s 264.51(c) , (d) , a n d (f ) ar e ARAR s fo r disposa l o f soi l an d debri s i n wast e piles

. I n addition , 

### subsection s (b) , (c) , (d) , (e) , (g) , an d (i ) o f Colo

. Rev

. Stat

. o f § 34-32-116(7 ) ar e 

### ARARs fo r disposa l o f soi l an d debris

. I f a n y migratio n o f substance s fro m th e disposa l 

### occurs , correctiv e actio n mus t b e taken

. 1 7

. Inser t th e followin g languag e afte r th e thir d ful l paragrap h o n pag e C-19 : 

### J

. Nois e T h e Stat e has identifie d as a n ARA R sectio n 25-12-10 3 o f it s nois e abatemen t statute

. Thi s provisio n establishe s maximum 

### permissibl e nois e levels

. Se e Colo

. Rev

. Stat

. sectio n 25-12-103

.

Whil e this 

### provisio n i s not applicabl e becaus e i t 1 4relate s

t o civil action s fo r publi c nuisance , 

### i t i s relevan t and appropriat e t o protec t the citizen s o f Leadvill e fro m nois e pollutio n durin g constructio n

activities

. V

. SUMMAR Y O F ARAR S A

. Waive r o f ARAR s F o r th e chemical-specifi c

ARARs , pursuan t t o sectio n 12l(d)(4)(A

) o f CERCLA , attainmen t o f t h e maximu m contaminan t level s fo r drinkin g 

### water , th e federa l ambient wate r qualit y criteria , an d th e "Tabl e Values " i n 5 Cod e Colo

. Regs

. 1002- 8 i s waived

. Th e "basi c standards " portio n o f th e Basi c Standard s an d 

### Methodologies , 5 Colo

. Cod e Regs

. 1002-8 , as quote d on page s C- 8 and C-9 , and the antidegradatio n

standar d are not waived and 

### shal l b e attaine d a s ARAR s fo r this operabl e unit

. Ther e ar e n o waivers fo r attainmen t o f action-specifi c

o r location-specifi c

ARARs

. 

### B

. ARARs fo r Subsequen t Operabl e Unit s T h e ARAR s fo r subsequen t operabl e unit s a t t h e Californi a Gulc h sit e wil l b e addresse d 

### in th e RO D fo r thos e operabl e units

. I hav e determine d tha t th e selecte d remed y meet s th e requirement s o f CERCLA an d th e NCP

. Dat e Regiona l Administrato r Regio n VII I U.S

. Environmenta l

Protectio n Agenc y

1 5Scenario s

Curren t Condition s Noru l fION , n o plug s Blac k Clou d Nin e puipin g Noria l flow , n o plug s Blac k Clou d Hin e n ot puipin g Selecte d Reied v Resurrectio n an d Ibe x plug s an d porta l plu g drainin g Black Clou d nine puipin g Resurrectio n an d Ibe x plug s an d porta l plu g drainin g Blac k Clou d Hin e n o t puiping Tabl e A- 2 SUMMAR Y OF GROUN D HATER FLO W PROJECTION S UNDER VARIOU S PLUGGIN G SCENARIO S T o T

o Flo w Approxiiate

Wate r T o Evan s T o T o Dee p Diverte d t o Leve l Elevation s i n Min e Area s Porta l Leadvill e Gulc h Californi a Blac k Groun d Othe r Area s (steady-state , noraa l flgt L f t nsl l Flo w Tunne l Are a Gulc h Are a Clou d Hate r Becaus e o f (gpi ) Jsei L (PJ>») (gpj ) (M l (m l (gp« l Plu g Resurrectio n Jbex

_ Irene.

. Jh»

_

49 0 1 0 1 0 240 7 0 10,40 0

10,40 0 10,000 10,350

67 5 1 0 1 0 8 5 4 0 10,40 0 10,40 0 10,60 0 10,350

0 1 0 29

5 315 9 0 11 0 10,750 10,650 10,00 0 10,350

0 1 0 1 5 33 0 115 31 0 10,90 0 10,800 10,800 10,35 0 Note : Yak Tunne l porta l invert elevatio n is 10,333 fee t (abov e isl)

.RECHARG E 1 0 

# I GROUN

D WATE R 135 RESURRECTIO N GROU P GROUN D WATE R 12 5 GROUND WATE R 8 5 IBEX/IREN E GROU P
NORTH/SOUT H IRO N HIL L GROU P GROUND WATE R 120 BEDROC K OUTFLO W 2 5 T O BLACKCLOU D 31 5 GROUND AND SURFAC E WATE R 23 5 3 5 BEDROC K OUTFLO W

1 0 BEDROCK FLO W 3 0 (CUMULATIV E

BEDROC K OUTFLO W 9 0 GPM ) TOTA L INFLO W 71 0 GP M OUTFLO W 71 0 GP M LEGEN

D FLO W I N 1 0 GP M 

## FIGUR E A. 7 4 NORMA L FLOW , RESURRECTIO N

AN D " IBE X PLUGS WIT H PORTA L PLU G DRAININ G BLACK CLOU D PUMPIN GRECHARG E 1 0 GROUN D

WATE R 9 0 EVAN S GULC H ARE A 1 5 GROUN D 2 0 RESURRECTIO N GROU P

GROUN D WATE R 8 5 WATE R

/ IBEX/IREN E

GROU P

5 0 NORTH/SOUT H IRO N HIL L GROU P GROUN D WATE R 3 0 BEDROC K OUTFLO W 3 0

BEDROCK FLO W 3 0 1 0 32 0 T O BLACKCLOU D 0 GROUND AN D SURFAC E WATE R 23 5 BEDROC K OUTFLO W 5 5 (CUMULATIV E BEDROC K OUTFLO W 1 1 5 GPM ) TOTA L INFLO W 47 0 GP M OUTFLO W 47 0 GP M LEGEND FLO W I N 1 0 GP M 

### FIGUR E A. 8 NORMAL FLOW , RESURRECTIO N

AN D IBE X PLUG S WIT H PORTA L PLU G DRAININ G BLACK CLOU D NO T PUMPIN GCOST S ESTIMATE S FO R SELECTED REMED Y SYSTE M CRITERI A MAXIMU M CAPACIT Y O F TREATMEN T

. 30 0 GP M LIN E CONSUMPTIO N 2.30 0 IB/DA Y POK R REQUIREMEN T 50 0 H P AVERAGE FLOH TREATED IS

O GP N POHE R REOUIRENfH T 25 0

H P I I * CONSUMPTIO N 1,15 0

Lfl/DA Y PERIO D O F MONITORIN G 1 0

YEAR S 50.00 * THEREAFTE R I N PERPETUIT Y PERIO D OF TREATMEN T I

K PERPETUIT Y CAPITA L COS T SUBTOTA L TUME L PLUGGIN G PLUG S 3

PLU G DRAI N MECHANIS M LUMP SU N TENP

. TUNNE L REHA8

. 2.00 0 F T VENTILATION LUMP SU M LIGHTIN G LUMP SU N PER N TUNHEL REHA B 1,50 0 F T SURFACE HATER CONTROL MEASURES CONCRET E CHANNEL 1,50 0 F T SHAF T SEAL S 6 SHAFT S GROUTIN G MAX

. A S REOUIRED MONITO R SYSTEM MONITO R NELL S 3 5 45 0 F T SAMPLIN G PUMP S 3 5 ( FLUMES,HEIRS,£TC

. LUMP SU N
HATE R CtUECTIC H AN ) TREATMEN T PON D ( COLLECTIO N SYSTEM LUMP SU N H D S TREATMEN T SYSTEM LUMP SU M PONE R SUPPL Y SUBSTATIO N 1,000 K V t DISTRIBUTIO N A N D CONTRO L 50 0 H P 8 SUBTOTA L ADD-O N ITEM S SCOP

E A W BI D ADNIN./LEGAL/SAFE T CONSTRUCTIO N SERV I STARTUP $116,20 0

J US 175 0 (300 (30,000

$10 0 P E R F T )5,00 0

(3 5 (30 0

20.001 2.00 * 10.00 * 5.00 * 1.814,60 0 348.600 50.00 0 270.000 15.00 0 6.00 0 1,125,00 0 1,030,00 0 450.00 0 180.00 0 400.00 0 1,800,000 1,575,00 0 175.000 50,000

4,672,00 0 3,000,000 1,487,00 0
35,000 150,000

9,316,60 0 1,863,32 0 186,33 2 931,66 0 465,830 CIVI L ELEC. / MECHANICAL 116.20 0 25,00 0 25.000 800,00 0 325.00 0

450,00 0 180,000

2,000,000 1,000.000 200,00 0 1,287,00 0
35,000 150,000
3,771,20 0 2,822,00 0 754.24 0 564,40 0 75,42 4 56,44 0 377,12 0 282,20 0 188,56 0 141,100 FRON T EN D
232.40 0 270.000 15.00 0 6,000

400,000
1,575.00 0 175.00 0 50,000

2,723,40 0 544.680 54.46 8 272,34 0 136,17 0 ANNUA

L OPERATION i MAINTENANCE COST S MAINTENANC E MAINTENANC E MAINTENANC E MAINTENANC E MAINTENANC E MAINTENANC E MAINTENANC E MAINTENANC E MAINTENANC E SAMPLIN G TECHNICIAN S CHEMICAL ANALYSE S 25 0 REMOT E SENSIN G EXPENSE S MAINTENANC E MAINTENANC E ANHUA L • REAGEN T ( COS T OPERATOR S MAINTENANC E MAINTENANC E PONE R t 0.50 * 1,74 3 5.001 2,50 0
2.00 1 22,50 0

0.50 1 2,25 0 O.SO t 90 0 1.00 * 4,000

5.00 * 78,750 10.00 * 17,50 0 5.00 * 2.500 75,00 0 (25 0 62.50 0 20.00 0 10,00 0

1.00 * 30,00 0 2.00 * 29,74 0 32.00 0 300,00 0 5.00 * 1,75 0 5.00 * 7,50 0 8.0 0 130,64 7 C/KH H ADMINISTRATIVE INSURANCE , TAXES , A N D LICENSE S CONTINGENCY SUBTOTA

L 26.74 3 t



## c 

## c C C
7,150

266,25 4

531,63 7

TOTA L 12,763,74 2 5,166,54 4 3,866,14 0 3,731,05 3 805,03 7 10.00 * 80,50 4 2.00 * 16,10 1 15.00 * 120,75 5 1,022,39 7PARAMETER S DISCOUN T RAT E ECONOMI C LIVE S CIVI L MECHANICAL/ELECTRICA L MONITORIN G TABL E B- 3 PRESEN T NORT H ANALYSI S A T VARIOU S DISCOUNT S RATES

50.00 15.00 10.0 0 10.00 * SINKIN G FUN D PRESEN T VALU E FACTORS O F A LUM P SU M Y R S Y R S Y R S 0.0008 6 0.0314 7 0.0627 5 0.3855 4 5.00 * SINKIN G FUN D PRESEN T VALU E FACTORS O F A LUM P SU H 0.0047 8 0.0463 4 0.0795 0 0.6139 1 3.00\

SINKIN G FUN D PRESEN T VALU E FACTORS O F A LUM P SU M 0.0088 7 0.05377 0.0872 3 0.7440 9 C O PRESEN T VALUE COST S CAPITA

L COST S ORIGINA L REPLACEMEN T ANNUAL COST S 04 M MONITORING 23,835,66 3 14,024,95 2 35,854,02 8 12,763,74 2 CIVI L 44,39 0 ELEC/MEC H 1,216,82 0 7,561,465 2,149,24 5 9,710,71 1 16,840,64 2 52,330,81 3

12,763,74 2 493,58 4 3,583,31 5 15,122,93 1 3,690,45 6 18,813,38 7 21,219,51 2

12,763,74 2 1,526,79 9 6,928,97 1 25,204,88 4 5,573,08 3 30,777,968

5.0 0 YEA R REVIE H 8 $50,00 0 100,000 100,00 0 200,000

200,000 333,333

333,33 3CERTIFICAT E O F SERVIC E T h e undersigne d hereb y certifie s tha t th e origina l o f th e attache d ADMINISTRATIV

E ORDE R FO R YA K TUNNE L OPERABLE UNI T REMEDIA L DESIGN/REMEDIA

L ACTIO N wa s hand-carrie d

t o th e Regiona l Hearin g Clerk , EP A Regio n VIII , 99 9 18t h Street , Suite 500 , Denver , Colorado , an d tha t a tru e copy o f sam e was hand-delivere d to : Bradley ,

Campbel l & Carne y Attorney s fo r ASARC O Incorporate d an d th e Res-ASARC O Join t Ventur e 171 7 Washingto n Avenu e Golden , Colorad o an d Sherma n & Howar d Attorney s fo r Newmon t Minin g Corporatio n a n d Resurrectio n

Mining Compan y Suit e 300 0 6 3 3 Seventeent h Stree t Denver , Colorad o 

# j o /?? ? LAAJU*

L P , DateNam e