ADMINISTRATIV E RECORD

287950

Exhibit 3

RECORD OF DECISION MODIFICATION Y AK TUNNEL OPERABLE UNIT CALIFORNIA GULCH SITE , LEADVILLE , COLORADOf t p

Thi s document sets forth changes in the Declaratio n and Decision Summary for the Record of Decision (ROD ) for the Yak Tunne l Operable Uni t of the Californi a Gulch Sit e signed o n March

2 9, 1988.

DECLARATION FOR TH E RECORD OF DECISION

1. Delete pages 2 and 3 in their entiret y and the firs t

ful l paragraph on page 4. In their place , substitute the

followin g language:

1. A surge pond or ponds to collect

flo w from the Yak Tunnel and

support treatment plan t operations;

2. Concrete plugs at a minimum of

three locations within the tunnel

to flood the sulfid e zones, to halt

t he uncontrolled discharge of

tunnel effluen t to California Gulch, and to prevent surges;

3. Water control measures to reduce

surface water inflo w into the

tunnel system and to minimize

uncontrolled ground water outflo w

from the tunnel system followin g

plugging, as necessary for proper

performance of the remedy;

4. A monitoring program to establish

baseline preremediation water

quality and to predict and evaluate

hydrologic changes;

5. A water collectio n system to collect

water from behind the portal plug;

6. A water treatment facilit y to treat

a l l flo w from the Yak Tunnel prior

to release to California Gulch;

7. Operations and maintenance of the

selected remedy; and
8. A contingency pla n to address any

adverse hydrologic changes

resultin g from tunnel plugging.

2. Delete the fift h and sixth sentences in the fourth

paragraph on page 4. In their place , substitute the followin g

sentence:

Thi s remedy is only a firs t step toward

cleanup of California Gulch surface water and

is part of a total remedial action for the

site.

DECISIO N SUMMAR Y

1. Throughout the Decision Summary , substitute the term

"water treatment facility " wherever the term "interim treatment

facility " appears .

2. Delete the descriptio n of the selected remedy on pages

34-35. In it s place , substitute the followin g language:

o A surge pond or ponds;

o Tunnel plugs;

o Water control measures;

o A water treatment facility ;

o A monitoring program;

o A contingency plan ; and

o Operations and maintenance.

3. In the firs t sentence in the second ful l paragraph on

page 38, delet e the words "to near zero".

4. Delete the firs t ful l paragraph on page 40, and

substitute the followin g language:

Because of the concern about uncontrolled

seepage should floodin g occur behind the

portal plug , the portal plu g wil l be designed

primaril y for surge control and wil l

incorporate a pumpin g or drainin g mechanism

f or normal flow . Water flowin g through the

tunnel to the portal plu g wil l be pumped or

drained fro m behind the plu g to the treatment

plant . Detail s of the treatment system are

discussed later in more detail .
5. Afte r the third ful l paragraph on page 40, add the

followin g language:

Water control measures need be constructed

only to the extent necessary for costeffectiv e short- and long-term performance of

the remedy and as needed to protect human

health and the environment. Reducing

infiltratio n of surface waters to the Yak Tunnel behind the portal plug may lead to

more consistent tunnel flo w and water quality

which may in turn lead to more costeffectiv e treatment plan t operations. Water

control measures related to the other plugs

may reduce the potential for adverse water

qualit y movement and may reduce the long-term

cost of a pump-and-treatment system, should

problems occur.

6. Delete the term "Water Collectio n and Interi m Treatment"

a nd the third ful l paragraph on page 41, page 46 in its entirety ,

a nd the firs t two paragraphs on page 47. In their place ,

substitute the followin g language:

Water Treatmen t Facilit y

As discussed above, a treatment facilit y will

be built to treat flo w from the Yak Tunnel . T he treatment facilit y wil l be constructed

and operational before entry into the tunnel

f or remedial design. It wil l then be

operated continuously to treat all flo w from

the tunnel.

Once the plugs are constructed, the facilit y

wil l treat water draining through the portal

plug. Water levels behind the portal plug

wil l be controlled by pumpin g or by a speciall y designed flow-through system having

an upstream invert elevation equal to the

level of the base of the Yak Tunnel at that

point. A monitoring system will be installed

behind the plug to assure that any flow -

through system is operating properl y and that

water levels are not rising behind the plug. Afte r installatio n of the two upgradient

plugs , the average flo w rate from the portal

plug will be approximatel y 285 gpm.

T he treatment facilit y will incorporate lime

treatment and the use of high density sludge

(HDS) technology supplemented with a chemical
additio n to assist in the removal of cadmium. The surge pond wil l be used as an

equalization pond to minimize variations in

flo w rate and chemistry of the water for the

treatment plant . The design of the facilit y

wil l be as flexibl e as possible to permit

integration of the facilit y with treatment

needs associated with the contingency plan

described below and additional remedial

actions for the California Gulch site.

T he treatment process will result in the

generation of sludge. Sludge produced by

conventional lime softenin g is very difficul t

to dewater due to its dilute , non-dense, nonfilterabl e characteristics. HDS technology

circulates the precipitates caused by lime

softenin g to produce discrete, denser

particles that are more free-draining and

filterable . The recycled sludge particles

can then be dewatered in a filte r press and

subsequently bagged for disposal . Disposal

of the sludge wil l either be through resource

recovery to recover zinc and possibl y other

metals or in an appropriate landfil l either

on-site or off-site . The requirements

governing sludge disposal are discussed in Appendix C.

7. Delete the term "Contingenc y Plans" between the second

and third paragraphs on page 47. In its place , substitute the

term "Contingency Plan".

8. Add the followin g language afte r the fourth paragraph on

page 47:

Other measures may also be necessary to

address any adverse effect s associated with

tunnel plugging. Such measures will be

incorporated into a contingency plan to

address any impacts due to floodin g resultin g

from plugging.

9. Delete the firs t sentence in the last paragraph on page

4 7. In it s place , substitute the followin g language:

Water control measures will be maintained as

necessary to ensure cost-effective

performance of the remedy.

1 0. Delete the titl e and text of the second paragraph on

page 48. In it s place , substitute the followin g language:
Water Collectio n and Treatment Facility . Routine repair or replacement of pumps , motors, mixers, clarifier rakes, piping,

filter s and tankage will be required. Inspectio n and repair of any portal flow -

through device and drainage system to the

equalization pond will also be necessary. T he equalization pond liner will be visuall y

inspected and the leakage detection system

monitored regularly . Pond dikes, fencing,

barge, barge pumps and pipin g wil l also

require routine inspection and maintenance.

Electrical power is required for pumping and

treatment operations. Lime, flocculant s and

reagents will be consumed in the treatment,

collection and shipment of sludge produced

from the treatment plant .

1 1. Delete the firs t sentence in the fourth paragraph on

page 48. In it s place , substitute:

T he estimated capital cost of the selected

remedy is $12,763,742 and the present-worth

estimate using a ten percent discount rate is

$23,835,663.

1 2. Delete the second and third sentences in the fourth,

paragraph o n page 49.- In their place , substitute the followin g

language:

It is estimated that installatio n of the Ibex-Iren e and Resurrection plugs could

reduce the flo w from the Yak Tunnel system to California Gulch by approximatel y 50 percent. It is anticipated that the remaining flo w

wil l be treated to reduce metal loads in

water discharged to California Gulch by 90 to

95 percent.

1 3. Delete the last ful l sentence on page 49.

1 4. Delete the words "and grouting" fro m the second

sentence of the second ful l paragraph on page 50.

1 5. Delete the third, fourth , an d fift h sentences i n the

second ful l paragraph o n page 50. In their place , substitute the

followin g language:

T he water treatment process wil l create a sludge which may be processed for resource

recovery and thus eliminate the need for land

disposal . If land disposal i s necessary for
some or all of the sludge produced, the

amount of material and its toxic properties

will be minimized.

1 6. In Tabl e 6, page 51, under Surfac e Water Impacts , i n

t he mitigatio n measure for "Impact s o n floodplain s fro m

construction of the interim treatment facilit y and ponds below Y ak Tunnel" , substitute the term "500-year flood" for the term

"100-year flood" .

1 7. In Tabl e 6, page 51, under Other Impacts , delet e the

mitigatio n measure for "Loss of land associated with constructio n

of interim treatment facility " o n page 51. In it s place ,

substitute the followin g language:

T he loss of land will be minimized to the

extent practicable.

1 8. Delete the words "interim treatment facility " fro m the

las t partial sentence on page 51. In its place , substitute the

words "selected remedy."

1 9. Delete the phrase "except for the interim treatment

facility " on the top lin e of page 53.

2 0. Delete the firs t through fourth sentences in the firs t

partial paragraph o n page 53. In their place , substitute the

followin g language:

T he water treatment facilit y will be sized,

designed, and sited to permit, to the extent

practicable, its integration into a full -

site remedy.

2 1. Delete the last sentence fro m the second ful l paragraph

2 on page 53.

2 2. Delete the last sentence in the firs t partial paragraph

on page 54.

2 3. Delete the word "final " fro m the second sentence in the

third paragraph on page 54.

24. Delete the word "interim" fro m the sixth sentence in

t he firs t ful l paragraph o n page 56.

APPENDIX A

1. Tabl e A-2 has been revised to reflec t the modification s

i n the portal plug. Substitut e the attached Tabl e A-2.

2. Figure s A.7 and A.8 have been modified to reflec t the

modified remedy. Substitut e the attached figures .
3. Delete the sections titled "Selected Remedy, Black Cloud Pumping" and "Selected Remedy, Black Cloud Not Pumping" on pages A-13 an d A-14. In their place , substitute the followin g

language:

SELECTE D REMEDY , BLACK CLOUD PUMPING

Afte r installation of the Resurrection and Ibex plugs and the portal flow-through plug,

the Yak Tunnel portal flo w will be reduced to

about 285 gpm (Figur e A.7) . The proposed

location of the plugs is shown in Figure A. 4. Water levels in the Resurrection and Ibex Groups would increase to approximatel y 10,750

feet and 10,650 feet mean sea level (msl) ,

respectively. Sulfid e rock would stil l be

present above the water table and some acidic

mine drainage formation would persist. Deep

ground water flo w would total approximatel y

90 gpm and inflo w to Black Cloud would be

about 315 gpm. Ground water seepage toward

the Leadvilie Drainage Tunnel and local seeps

would be about 10 gpm each.

Water level s in the Iron Hil l Group would

remain at the current level of 10,350 msl.

Changes in water level behind the portal plug

are not anticipated since the water level

will be controlled either by pumpin g or by

using a speciall y designed flow-through plug maintained at an elevation equal to the

invert elevation of the flow-through device

at the floo r of the Yak Tunnel at the portal

plug location. The plug will prevent surges

from occurring due to tunnel deterioration,

but wil l allow normal water flo w of about 285

gpm to drain to the treatment plant .

Minimizin g the inflo w of surface water to the Y ak Tunnel may be needed for optimal

management of the treatment plan t operations. If so, the followin g areas will probably need

grouting: 1 ) stream channelization where

California Gulch flow s over the near-surface

underground mine workings that connect to the Y ak Tunnel; 2) along and to the west of the

10,350 foot contour; and 3) in the area

overlying the underground mine workings

immediately to the north of the Yak Tunnel

portal .

7
SELECTE D REMEDY , BLACK CLOUD NOT PUMPING

When the Black Cloud mine is not pumping and

the Resurrection, Ibex, and portal plugs are

in place, the water levels in the Irene Group

would increase to approximatel y 10,800 feet

msl , while those in the Resurrection Group

would increase to 10,900 feet msl. However,

acidic mine drainage would likel y stil l occur

in these areas because some sulfide rocks

would stil l be exposed. The water level in

t he Iron Hil l Group would not be affected .

T he total deep ground water seepage from all

mine workings would increase to about 115 gpm

and increase the portal flo w to about 320

gpm. No increased surface seepage to California Gulch is anticipated. An

additional seepage of roughly 15 gpm from the Resurrection Group toward the Evans Gulch

area could occur. Due to its small quantity,

this seepage is not expected to cause any

significan t ground water quality

deterioration in the Evans Gulch area. The

monitoring network, which shows both ground

water flo w and qualit y conditions, will

provide informatio n to track this condition.

APPENDIX B

1. Delet e Table s B-2 and B-3.

attached.

T he modified tables are

2. Delete the section "Compariso n with Cost Figure s in FS"

on page B-4. In it s place , substitute the followin g language:

COMPARISON WITH COST FIGURES IN F S AND ROD

T he basis of this estimate is generall y

similar to that developed in the FS. Exceptions primaril y include the grouting and

monitoring programs outlined above. The cost

associated with the surge pond, which has

already been constructed, was provided by the Res-ASARCO Join t Venture. The cost includes

pump structures, drainage, by-pass channels,

fencing, pond pumps , dams, leak detection ,

filters , pond barge, etc. Because the pond

is in place, the scope and bid contingencies

were reduced from 35 percent (in the March

29, 1988, ROD ) to 20 percent.
Engineering experience on similar project s

was used to estimate costs for the plug drain

mechanism and for rehabilitation of the firs t

1500 fee t of the Yak Tunnel to the portal

plug location. Costs included mucking,

sludge disposal , lighting, and ventilation.

T he capital costs and annual O&M costs are

shown in Table B-2. The present worth

analysis at 10 percent, 5 percent and 3

percent discount rates is shown in Tabl e B3.

APPENDI X C

1. Add to the table of content s the followin g language:

V. SUMMARY OF ARARS

A. Waiver of ARARs B. ARARs for Subsequent Operable Unit s

2. Throughout Appendix C, substitute the term "water

treatment facility " wherever the term "interim treatment

facility " appears .

3. Insert the followin g language afte r the indented

quotatio n on page C-9:

T he Stat e has also identified the "Table Values" in 5 Code Colo. Regs. 1002-8, which

set concentrations for various parameters

based on aquatic lif e studies, as ARARs to

the extent that they are more stringent than

ambient water quality criteria.

4. Delete the last sentence on page C-9.

5. At the end of the firs t ful l paragraph on page C-13 ,

insert the followin g language:

In addition , in accordance with the Water Resources Council "Floodplai n Management Guidelines," to the extent that portions of

the remedy could be considered as a critical

action, the remedy wil l be design for the 500

year flood event.

6. Delete the word "no" in the firs t sentence of the second

paragraph on page C-15.
7. Substitut e the word "applicable" for the word "ARARs" in

t he fift h sentence of the second paragraph on page C-15.

8. Afte r the second paragraph on page C-15 , insert the

followin g language as a new paragraph:

In addition , the Colorado Mined Land Reclamation Act , contains additional

provisions which may be relevant and

appropriate to pluggin g activities. The State has identified subsections (b) , (c) , (d) , (e) , (g) , an d (i ) o f Colo. Rev. Stat .

§ 34-32-116(7 ) (1988 Supp. ) an d the

corresponding sections of Rule 6 of the Mineral Rules and Regulation s of the Colorado Mined Land Reclamation Board revised as of November 1988 as relevant and appropriate.

9. At the end of the third paragraph on page C-15 , add the

followin g sentence:

I n addition , subsections (b) , (c) , (d) , (e) , (g) , an d (i ) of section 34-32-116(7 ) of the Colorado Mined Land Reclamation Act and the

corresponding rules contain additional

provisions which may be relevant and

appropriate to implementatio n of this

component of the remedy.

1 0. Insert the followin g paragraph at the end of the firs t

partial paragraph on page C-16:

T he State has also identified the prospectin g

requirements of the Mineral Rules and Regulation s of. the Colorado Mined Land Reclamation Board as an ARAR. The

requirements in Rule 5.3.1, 5.3.2, 5.3.7,

5.4.1, 5.4.3, and 5.4.5 contain substantive

requirements pertaining to drillin g

activities.

1 1. Delete the second sentence in the second ful l paragraph

on page C-16.

1 2. Substitut e the phrase "any pumpin g or collectio n

systems constructed as part of the remedy" for the phrase "the

collectio n system" in the fourth sentence of the second ful l

paragraph on page C-16.

1 3. Afte r the second ful l paragraph o n page C-17 , insert

t he followin g language:

10
In addition to technology-based standards,

under section 30l(b)d)(C ) of the Clean Water Act , 33 U.S.C . § 1311(b)(1)(C) , water

treatment facilitie s may be required to meet

more stringent water quality-based effluen t

limitation s and standards. Water qualitybased effluen t limitations are imposed when

necessary to assure attainment of State water

quality standards. As discussed in Section III(C) , th e State' s water quality standards

include table values and a narrative standard

prohibitin g discharges "in amounts,

concentrations, or combinations which are

harmful to the beneficial uses or toxic to

humans, animals, plants , or aquatic life. "

S ee Section 3.1.11(d) . Thi s "n o toxic

material in toxic amounts" narrative standard

is an ARAR for the effluen t discharged from

t he treatment plant .

It is EPA polic y to implement water qualitybased effluen t limitations , including the

narrative "no toxic materials in toxic

amounts" prohibition contained in all State

standards through an integrated strategy

consisting of both biological and chemical

methods. See EPA, Development of Water Quality-Based Permit Limitation s for Toxic Pollutants; National Policy , 49 Fed. Reg.

9,016-9,019 (1984) . The strategy outlined in

this polic y and related EPA guidance will be

used to set effluen t limitations for the

treatment facilit y based on attainment of the

narrative standard and specifi c chemical

goals.

Initially , the treatment facilit y will be

required to attain an effluen t limitatio n

based on acute toxicity testing. When

additional cleanup of California Gulch or the

upper Arkansas River is achieved, the

operative effluen t limitation will be

modified to protect aquatic lif e from chronic

toxicity.

1 4. Insert the citatio n "122.22(b)-(d) " between 122.21 an d

122.41 in the fourth sentence in the third ful l paragraph on page

C-17.

1 5. Afte r the fourth sentence i n the third ful l paragraph

on page C-17 , add the followin g sentence:

11
To the extent that collectio n of aquatic lif e

is necessary for biological monitoring, the State requirements governing the collection

of wildlif e for scientifi c purposes must be

met. See 2 Colo. Code Regs. 406-8, ch. 13,

art. Ill , section 1316.

1 6. Delete Sectio n G on pages C-17 to C-19 in its entirety , In it s place , substitute the followin g section:

G. Management of Sludge and Excavated Soil s

During the course of construction and

operation of the selected remedy, materials

will be produced which will require storage

or disposal . These materials include sludges

from the surge pond and water treatment

facilit y and excavated soils. The management

of each type of material is described below.

1. Sludge s

T he selected remedy wil l produce two types of

sludges: surge pond sludge and treatment

facilit y sludge. The surge pond system

serves as a settlin g pond and will contain

sludges and sediments that settle in the pond

during its operation. The water treatment

facilit y will produce a high density sludge. T he ARARs vary dependin g on the

characteristics of the sludge and the

management technique selected. The first,

step is to determine if the sludge is a hazardous waste in accordance with 40 C.F.R .

§ 262.11. As the characteristics of the

sludges may vary, the sludges must be

analyzed in accordance with 40 C.F.R.8

264.13. The ARARs for hazardous wastes and

non-hazardous wastes are described below.

a. Hazardous Wastes

If the sludge is a hazardous waste, it must

be stored, transported, and disposed of in

compliance with Subtitl e C of RCRA and any more stringent State requirements. The

specifi c requirements depend on whether the

sludge is managed on-site or off-site .

For on-site storage and disposal , a permit is

not required, but the substantive

requirements of 40 C.F.R . Part 264, Subpart s

12
B, C, D, E, F, and G, and any more stringent State requirements are ARARs. Depending on

the method of storage or disposal , the

followin g requirements and any more stringent Stat e requirements would also be ARARs:

containers (Subpart I) , surface impoundments

(Subpart K) f o r landfill s (Subpart N) . Disposal would also be governed by the land

disposal restrictions established in 42 U.S.C . § 6924(d) . In addition , the locationspecifi c requirements discussed above would

also be ARARs.

Off-sit e transportation , storage, and

disposal must be conducted in compliance with

a ll applicabl e laws. If the material is to

be disposed of offsite , it must be disposed

of i n accordance with section 12l(d)(3 ) of CERCLA, 42 U.S.C . § 9621(d)(3) .

b. Non-hazardous Wastes

If the sludge is not a hazardous waste, it

must be stored, transported, and disposed of

in compliance with Subtitl e D of RCRA and any more stringent Stat e requirements. Again ,

the specifi c requirements depend on whether

the sludge is managed on-site or off-site .

F or on-site storage and disposal , in addition

to the location-specific requirements

discussed above, provisions of both Federal

and Stat e waste management are ARARs for

storage or disposal of sludge. The Federal Criteria for Classificatio n of Solid Waste Disposal Facilitie s and practices, 40 C.F.R . Part 257, establishes minimum criteria for

surface water, ground water, air, and safety .

40 C.F.R . sections 257.3-3, .3-4, .3-7, .3-

8. In addition , section 30-20-110 of the Stat e Solid Wastes Disposal Site s an d Facilitie s Act and 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, and 6.10 of the State Solid Waste Disposal Site s and Facilitie s Regulation s

establish further requirements for waste

disposal . See 6 Colo. Code Regs. 1007-2.

T he followin g regulations are also ARARs for

management of treatment facilit y sludge: 40 C.F.R . section 264.13(a)(1)-(a ) (general

waste analysis) , 264.14 (security) , 264.15

13
(general inspection requirements), and 264.31

(desig n and operation of facility) . In

addition , certain provisions governing

landfill s would also be ARARs: 40 C.F.R .

section 264.301 (desig n and operating

requirements), 264.303(a ) (monitoring and

inspection) , and 264.309 (surveying and

recordkeeping).

Off-sit e transportation , storage, and

disposal must be conducted in compliance with

a ll applicabl e laws. If the material is to

be disposed of offsite , it must be disposed

of in accordance with section 121(d)(3 ) of

CERCLA, 42 U.S.C . S 9621(d)(3) .

2. Excavated Soil s and Debris

During construction of the remedy, there may

be excavations or activities which generate

soils and debris requiring disposal . There

are two options for disposal of this

material. First , the material may be managed

in the same manner as the sludges described

above. Second, the material can be

consolidated onsite with an existing waste

pile for remediation in a subsequent operable

unit, provided that the soils and debris are

stabilized to prevent migration of hazardous

substances, pollutants , or contaminants. Specifically , it will be necessary to control

run-on, run-off , and fugitive dust. Therefore , 40 C.F.R . sections 264.51(c) , (d) ,

a n d (f) are ARARs for disposal of soil an d

debris in waste piles . In addition ,

subsections (b) , (c) , (d) , (e) , (g) , an d (i )

of Colo. Rev. Stat . of § 34-32-116(7 ) are ARARs for disposal of soil and debris. If

a ny migration of substances from the disposal

occurs, corrective action must be taken.

1 7. Insert the followin g language afte r the third ful l

paragraph on page C-19:

J . Noise

T he State has identified as an ARAR

section 25-12-103 of its noise abatement

statute. Thi s provision establishes maximum

permissible noise levels. See Colo. Rev. Stat . section 25-12-103. Whil e this

provision is not applicable because it

14
relates to civil actions for public nuisance,

it is relevant and appropriate to protect the

citizens of Leadville from noise pollutio n

during construction activities.

V. SUMMARY OF ARARS

A. Waiver of ARARs

F or the chemical-specific ARARs , pursuant to

section 12l(d)(4)(A) of CERCLA, attainment of

t he maximum contaminant level s for drinking

water, the federal ambient water quality

criteria, and the "Table Values" in 5 Code Colo. Regs. 1002-8 is waived. The "basic

standards" portion of the Basic Standards and Methodologies , 5 Colo. Code Regs. 1002-8, as

quoted on pages C-8 and C-9, and the

antidegradatio n standard are not waived and

shall be attained as ARARs for this operable

unit.

There are no waivers for attainment of

action-specific or location-specific ARARs . B. ARARs for Subsequent Operable Units

T he ARARs for subsequent operable units at

t he California Gulch site will be addressed

in the ROD for those operable units.

I have determined that the selected remedy meets the

requirements of CERCLA an d the NCP .

Date Regional Administrator Region VII I U.S . Environmental Protectio n Agenc y

15
Scenarios

Current Condition s

Norul fION, n o plugs Black Cloud Nin e

puipin g

Norial flow, no

plugs Black Cloud Hin e

n ot puipin g

Selected Reiedv

Resurrection and Ibex

plugs an d portal plug

drainin g Black Cloud nine

puipin g

Resurrection and Ibex

plugs and portal plug

drainin g Black Cloud Hine

n ot puipin g

Table A-2 SUMMAR Y OF GROUND HATER FLOW PROJECTIONS UNDER VARIOU S PLUGGING SCENARIO S

T o T o Flow Approxiiate Water To Evans To To Deep Diverted to Level Elevation s in Mine Areas Portal Leadville Gulch California Black Groun d Other Areas (steady-state , noraal flgtL f t nsl l Flow Tunnel Area Gulch Area Cloud Hater Because of (gpi) JseiL (PJ>») (gpj ) (Ml (ml (gp«l Plug Resurrection Jbex_ Irene. . Jh» _

490 10 10 240 70 10,400 10,400 10,000 10,350

675 10 10 85 40 10,400 10,400 10,600 10,350

0 10 295 315 90 110 10,750 10,650 10,000 10,350

0 10 15 330 115 310 10,900 10,800 10,800 10,350

Note: Yak Tunnel portal invert elevation is 10,333 fee t (above isl) .
RECHARG E

10I

GROUN D WATE R

135

RESURRECTIO N GROU P

GROUN D WATE R

125

GROUN D WATE R

85

IBEX/IREN E GROU P

NORTH/SOUT H IRO N HIL L GROU P

GROUN D WATE R

120

BEDROCK OUTFLOW 25

T O BLACKCLOU D

315

GROUN D AN D SURFAC E WATE R

235

35 BEDROCK OUTFLO W

10

BEDROCK FLO W

30

(CUMULATIV E BEDROCK OUTFLO W

90 GPM)

TOTA L INFLO W 71 0 GP M OUTFLO W 71 0 GPM

LEGEN D

FLO W IN 1 0 GPM

FIGUR E A.7 4

NORMA L FLOW , RESURRECTION AND " IBE X PLUG S WITH PORTAL PLUG DRAININ G BLACK CLOUD PUMPIN G
RECHARG E

10 GROUN D WATE R

90

EVAN S GULC H AREA

15

GROUN D

20

RESURRECTIO N GROU P

GROUN D WATE R

85

WATE R /

IBEX/IREN E GROU P

50

NORTH/SOUT H IRO N HIL L GROU P

GROUN D WATE R

30

BEDROCK OUTFLO W

30

BEDROCK FLO W

30

10 320

T O BLACKCLOU D

0

GROUN D AN D SURFAC E WATE R

235

BEDROCK OUTFLO W

55

(CUMULATIV E BEDROCK OUTFLO W

1 15 GPM)

TOTA L INFLO W 47 0 GP M OUTFLO W 47 0 GPM

LEGEN D

FLO W IN 1 0 GP M

FIGUR E A. 8

NORMA L FLOW , RESURRECTIO N AN D

IBE X PLUG S WIT H PORTAL PLU G DRAININ G BLACK CLOUD NO T PUMPIN G
COSTS ESTIMATES FOR SELECTE

D REMEDY

SYSTEM CRITERIA

MAXIMUM CAPACITY OF TREATMENT . 300 GPM LINE CONSUMPTION 2.300 IB/DAY POKR REQUIREMENT 500 HP AVERAG E FLOH TREATED ISO GPN POHER REOUIRENfHT 250 HP I I * CONSUMPTION 1,150 Lfl/DA Y PERIOD OF MONITORING 10 YEARS

50.00* THEREAFTER IN PERPETUIT Y PERIOD OF TREATMENT IK PERPETUIT Y

CAPITAL COST SUBTOTAL

TUMEL PLUGGIN G

PLUGS 3 PLUG DRAIN MECHANISM LUMP SUN TENP . TUNNEL REHA8 . 2.000 F T VENTILATION LUMP SUM LIGHTIN G LUM P SUN PERN TUNHEL REHAB 1,500 FT

SURFACE HATER CONTROL MEASURES

CONCRET E CHANNEL 1,500 F T SHAF T SEALS 6 SHAFT S GROUTING MAX. AS REOUIRED

MONITOR SYSTEM

MONITOR NELLS 35 450

F T SAMPLING PUMPS 35 ( FLUMES,HEIRS,£TC . LUMP SUN

HATER CtUECTICH AN ) TREATMEN T

POND ( COLLECTION SYSTEM LUM

P SUN H D S TREATMENT SYSTEM LUMP SUM

PONER SUPPLY SUBSTATION 1,00

0 KV t DISTRIBUTION A ND CONTROL 500 HP 8

SUBTOTA L

ADD-ON ITEMS SCOPE AW BID ADNIN./LEGAL/SAFE

T CONSTRUCTION SERV I STARTU P

$116,200

J US

1750

(300 (30,000

$100 P ER F T )5,000

(35

(300

20.001

2.00*

10.00*

5.00*

1.814,600

348.600

50.000

270.000

15.000

6.000

1,125,000

1,030,000

450.000

180.000

400.000

1,800,000

1,575,000

175.000

50,000

4,672,000

3,000,000

1,487,000

35,000

150,000

9,316,600

1,863,320

186,332

931,660

465,830

CIVI L ELEC./ MECHANICA L

116.200

25,000 25.000

800,000 325.000

450,000

180,000

2,000,000 1,000.000

200,000 1,287,000

35,000

150,000

3,771,200 2,822,000

754.240 564,400

75,424 56,440

377,120 282,200

188,560 141,100

FRONT END

232.400

270.000

15.000

6,000

400,000

1,575.000

175.000

50,000

2,723,400

544.680

54.468

272,340

136,170

ANNUAL OPERATION i MAINTENANCE COSTS

MAINTENANC E MAINTENANC E

MAINTENANC E

MAINTENANC E MAINTENANC E MAINTENANC E

MAINTENANC E

MAINTENANC E MAINTENANC E SAMPLIN G TECHNICIAN S CHEMICA L ANALYSES 250 REMOT E SENSIN G EXPENSES

MAINTENANC E MAINTENANC E ANHUAL • REAGENT ( COST OPERATORS

MAINTENANC E

MAINTENANC E PONER t

0.50* 1,743

5.001 2,500

2.001 22,500

0.501 2,250 O.SOt 900

1.00* 4,000

5.00* 78,750

10.00* 17,500

5.00* 2.500

75,000

(250 62.500

20.000

10,000

1.00* 30,000

2.00* 29,740

32.000

300,000

5.00* 1,750

5.00* 7,500

8.00 130,647 C/KH H

ADMINISTRATIV E INSURANCE , TAXES , A N D LICENSES CONTINGENCY

SUBTOTAL

26.743

tccCC

7,150

266,254

531,637

TOTAL 12,763,74

2 5,166,544 3,866,140 3,731,053

805,037

10.00* 80,504

2.00* 16,101

15.00* 120,755

1,022,397
PARAMETERS DISCOUN T RAT E

ECONOMI C LIVES

CIVI L MECHANICAL/ELECTRICA L MONITORIN G

TABLE B-3

PRESENT NORTH ANALYSI S AT VARIOU S DISCOUNT S RATES

50.00

15.00

10.00

10.00*

SINKIN G FUN D PRESEN T VALU E FACTORS OF A LUMP SUM

Y RS Y RS Y RS

0.00086

0.03147

0.06275 0.38554

5.00*

SINKIN G FUN D PRESEN T VALU E FACTORS OF A LUMP SUH

0.00478

0.04634

0.07950 0.61391

3.00\

SINKIN G FUN D PRESEN T VALU E FACTORS OF A LUMP SUM

0.00887

0.05377

0.08723 0.74409

CO

PRESEN T VALU E COST S

CAPITA L COST S

ORIGINA L REPLACEMEN T

ANNUA L COST S

04MMONITORIN G

23,835,663

14,024,952

35,854,028

12,763,742 CIVI L 44,390

ELEC/MECH 1,216,820

7,561,465

2,149,245

9,710,711

16,840,642

52,330,813

12,763,742

493,584

3,583,315

15,122,931

3,690,456

18,813,387

21,219,512

12,763,742

1,526,799

6,928,971

25,204,884

5,573,083

30,777,968

5.00 YEAR REVIEH 8 $50,000 100,000 100,000 200,000 200,000 333,333 333,333
CERTIFICAT E OF SERVIC E

T he undersigned hereby certifie s that the original of the

attached ADMINISTRATIV E ORDER FO R YAK TUNNE L OPERABLE UNI T REMEDIAL DESIGN/REMEDIAL ACTION was hand-carried to the Regio

Hearin g Clerk, EPA Region VIII , 999 18th Street , Suit e 500, Denver, Colorado, and that a true copy of same was hand-delivered

to:

Bradley , Campbel l & Carney Attorney s for ASARCO Incorporated an d the Res-ASARCO Join t Venture

1717 Washingto n Avenue Golden , Colorado

and

Sherman & Howard Attorney s for Newmont Minin g Corporatio n

a nd Resurrection Minin g Compan y Suit e 3000

6 33 Seventeenth Stree t Denver, Colorado

jo /??? LAAJU*L P, DateNam e