Poor Quality Original

T he followin g document images

have been scanned from the best

available original copy.
UNITE D STATE S ENVIRONMENTA L PROTECTION AGENC Y

REGION VII I

9 99 18th STREET - SUITE 500 DENVER , COLORADO 80202-2466

Ref: 8EPR-SR

ACTION MEMORANDUM

DATE:

SUBJECT :

FROM:

T O:

January 26, 2000

Request for Removal (Response) Action at the California Gulch National Priorities List Site, Leadville, Colorado: ACTION MEMORANDUM for a Time- Critical Removal Action for at the Apache Tailings Impoundment (Operable Unit? ) A!

Rebecca Thom Remedial Proj ager

MaxH. Dodson Assistant Regional Administrator Office of Ecosystems Protection

and Remediation

Final NPL Site ID #29

CERCLIS ID # COD980717938

Category of Removal: Time-Critical

I. Purpose

Thi s Action Memorandum documents the Agency's selection and implementation

of the time critical removal (response) action described herein for the Apache Tailings Impoundments, an area contaminated with metal-laden tailings from

historic mining and millin g operations. The Apache Tailings Impoundment area

comprises a small portion of the Superfun d RI/FS Study Area of the California Gulch Superfun d Site, located in the Leadville mining district of Lake County, Colorado.

T he Time Critical Removal Action at the Apache Tailings Impoundments is

consistent with the remedial activities which will be undertaken by EPA at OU 7. Final remedial alternatives for all areas of OU 7 will be evaluated in the Focused Feasibility Study (FS) and Record of Decision (ROD) for OU7. The ROD for OU 7 will ultimately specify those remedial actions beyond those response actions

implemented pursuant to this Action Memorandum that are required.

Printod on Recycled Paper
This Removal Action will involve the Main Tailings Impoundment and the North Impoundment. These are shown on Drawing No. 5344-C1 attached. The primary

goals of the response action at the Main Tailings Impoundment are to eliminate the

accumulation of water in these areas and prepared the tailin g under the fill

placement footprint , through consolidation and dewatering, for future excavation

activities. The primary goal of the response action at the North Impoundment is to

reduce infiltration of surface water in the area which has been identified as a source

of metals loading to groundwater.

Remedial action objectives were identified in the Final Screening Feasibility Study for Remediation Alternatives at the California Gulch NPL Site, Leadville, Colorado (SFS), (ERA, 1993a). Consistent with the SFS, removal action objectives for the Apache Tailings Impoundments are:

O Control water erosion of tailings material from the source locations

O Control leaching and migration of metals from tailings into surface

water

O Control leaching and migration of metals from tailings into

groundwater

Removal alternatives to directly remediate surface water or ground water in the

vicinity of the Apache Tailings Impoundments have not been evaluated, and will be

addressed under Operable Unit 12.

I I. California Gulch - Site Conditions and Background

The California Gulch Site was listed on the National Priorities List on September 8,

1983. The Site is in a mining area covering 16

1

/4 square miles of a watershed that

drains along California Gulch to the Arkansas River. Starting in 1859, the area was

mined extensively for gold, lead, silver, copper, zinc, and manganese. California Gulch collects runoff that drains numerous abandoned mines and wastes from

mining, millin g and smelting. Miners built the Yak Tunnel to drain water from the

mine workings and to make mineral exploration and development easier. Thi s

tunnel drains hundreds of miles of mine workings in its 4-mile underground course

and prior to the construction of the Yak Tunnel Water Treatment Plant, discharged

approximately 210 tons of metals each year into California Gulch. Seventy-five

known mill s dumped tailings into 5-6 miles of drainages. Six impounded tailings

dumps surround the City of Leadville. Many smelters, which are located around the

Printed on Jtoeycfaf P»p»r
city, processed silver, lead and zinc at various times. Heavy metal residues are

present in much of the City. The Arkansas River which receives water from the California Gulch, has been classified as a recreational resource, and is used

heavily for irrigation, livestock watering, public water supplies and fisheries. Approximately 7,400 live in nearby Leadville and Lake County (See Exhibit 1 -Site Location Map and Exhibit 2 - Operable Unit Map)

III . Apache Tailings Impoundments

A. Background

T he Apache Tailings Impoundments now consist of the Main Tailings Impoundmen t and the North Tailings Impoundment. The smaller

impoundments, TP2 and TP3, which were located along California Gulch,

approximately 1,500 feet downstream of the Yak Tunnel Water Treatment Plant Surge Pond were removed in 1997. The material removed was taken

to the Main Tailing Impoundment. The main impoundment encompasses

approximately 11.3 acres and contains an estimated 630,000 cubic yards of

tailin g material. The embankment slopes on the north and east side of the

main impoundment range from 1.5:1 (H:V) to 1.75:1 and reach heights up to

15 feet. The embankment slope on the southwest side of the main

impoundment approaches 1:1 and is up to 50 feet in height. A field investigation was conducted in November and December 1996 to

supplement the existing data presented in the Remedial Investigation and Feasibilit y Study for the site. The purpose of this investigation was to gather

data to enhance the evaluation of the interaction of surface water and

groundwater in the immediate vicinity of the Apache Tailings Impoundments. As part of this supplemental field investigation, 11 new groundwater

monitoring wells were installed at the site. Two rounds of groundwater and

surface water samplin g were planned at the site as part of the supplemental

investigation; one samplin g event was performed in November 1996 to

coincide with low-flow conditions at the site involved the sampling of 18

groundwater wells, and surface water samplin g at 22 locations. Additional

detail s are provided in the Interim Removal Action Plan, Operable Unit 7, Cal Gulch Superfund Site, dated April 3,1997 and a letter dated March 1.3,1997

which transmits the monitoring data for the samplin g event described above. Both these documents are attached to the April 7, 1997 Action Memorandum.

Printed on Recycled Pmper
B. Site Characterization - Apache Tailings Impoundment

T he results of previous investigations related to the Apache Tailings Impoundment are presented in various reports including the Tailings Disposal Area Remedial Investigation Report, California Gulch Site, Leadville, Colorado, January 1994, the HydrogeologicRemediallnvestigation Report(1995), and the Surface Water Remedial Investigation Report (1995). In January 1996, a Draft Feasibility Study (FS) was submitted for the Apache Tailings Impoundments. Subsequent to the submittal of the draft FS, additional site investigation activities have been initiated to supplement the

previous investigations and to support completion of the FS. The principal concerns specifically addressed by this Removal Action are:

• Impacts the tailings impoundments may have on surface water and

groundwater quality in California Gulch; and

• Preparation of the tailings material, primarily through consolidation

a nd dewatering, to facilitate the timely implementation of future, final

response actions.

B. 1 A letter report dated September 23,1998 which summarizes surface

water and groundwater quality data from samplin g events performed

in the area of the Apache Tailings Impoundments, during November

and December 1996; Jun e 1997; November 1997 and Jun e 1998 is

attached.

C. Other Actions to Date

• A Time Critical Removal Action was performed by EPA on the Apache Energy and Minerals Property which is included in Operable Unit 7. The action involved removal of drums and bags of pyrite and

decontamination and demolition of buildings and equipment. Thi s Removal Action was addressed in a separate Action Memorandum

dated August 6,1996.

• During the summer and fall of 1995, ASARCO installed approximately

6 horizontal drain pipes to passively drain water from the main

impoundment. The demonstration project proved ineffective in

draining the tailings and was abandoned. Over the past several

years ASARCO has monitored water levels on top of the main

impoundment and TPs 2 and 3 and as needed, the ponded water has

been transferred to the Yak Treatment plant to prevent catastrophic

release of the metal-laden water into California gulch.

Printed on Recycled Pmper
SITE

Source: SMI/TerraMalrlx. 1996a

EXHIBIT 1

Calttomla Gulch Superfund Site General Location Map Leadville, Colorado

A Removal Action which was performed from April 21, 1997 thru August 27,1997 involved removal of Tailings Ponds # 2 and #3. The

material from the ponds was transported to and distributed on the

surface of the Main Tailings Impoundmen t as shown on Drawing No.

5344-C2 (Copy attached). Additional information concerning this

response action is available in the Final Pollution Report, Jun e 30,1998.

D. State and Local Authorities Roles

A cultural resource investigation of the Apache Tailings Area was conducted

in 1995. All of the activities involved with this response action involve

previously disturbed materials or materials which have been generated at OU 9 as a results of removal actions performed under the Mine Waste Pile Removal Action.

I V. Threats to Public Health or Welfare or the Environment

A Final Baseline Aquatic Ecology Risk Assessment (FBAERA), California Gulch, Leadville, Colorado (Roy F. Weston, Inc.) identifies the Site-wide impact of mine

waste contamination on the terrestrial and aquatic ecosystems at the Site. The FBAERA provides a conceptual model of Site-wide exposure for aquatic receptors.

Thi s Time-Critical Removal Action is necessitated by the threat to public health, welfare and/or the environment posed by the direct contact, inhalation, and

ingestion exposure routes to hazardous substances. The response action at the Main Tailings Impoundment is being performed as a preparatory step to subsequent

remedial action. The response action at the North Impoundmen t will eliminate

ponding of water in an area that has been identified as a source of metals loading. The actions will also reduce releases of metals to the surface and groundwater.

Printed on Recycled Paper
V. Endanaerment Determination

Actual and/or threatened releases of hazardous substances from the Apache Tailings Impoundments , if not addressed by implementin g the removal action

selected in this Action Memorandum, presents endangerment to public health, or welfare, or the environment. The public and environment will continued to be

exposed to the release of significant quantities of contaminated materials.

V I. Proposed Actions/Schedule

A. Proposed Actions

1. The proposed interim actions are described in the Interim Removal Action Plan, Operable Unit 7, Apache Tailings Impoundments, California Gulch Superfund Site, dated September 9,1999. The proposed interim actions

include the following:

MAIN TAILING S IMPOUNDMEN T

1.1 A total of approximately 11,000 cubic yards of fill material will be

needed to achieve the grades required to eliminate surface water

pondin g and to accelerate the consolidation and dewatering of the

tailings material. The fill material required will be generated from:

• Excavation of material placed on the Main Impoundment

during the removal of TP2 and TP3 in 1997 (approximately

1,000 cubic yards);

• Regrading the eastern embankment of the Main Impoundment

to a 3(H):1 (V) slope (approximately 2,000 cubic yards);

• Regrading the southwest embankment in the vicinity of the wooden box culvert, (approximately 1,500 cubic yards); and

• Excavation of tailin g material overlying the clay-tile culvert at

the southern edge of the Main Impoundment (approximately

7,000 cubic yards).

The tailin g excavation areas identified on the Main Impoundment are

considered to be consistent with activities that may be required under any

of the action alternatives considered in the OU 7 FFS.

Printed on Recycled P*p*r

As part of the excavation/construction activities outlined above, a berm will

be maintained at the top of the regraded slopes to direct runof f from the top

surface of the Main Impoundment to the remaining ponded area to prevent

flow from overtopping and eroding the regraded slopes. Positive drainage

will also be maintained toward the pond from the area(s) from which the TP2/TP3 material is excavated. Excavation in the area over the clay-tile

culverts will be maintained such that water will not pool and

wil l drain to California Gulch. Tailings that are exposed on the north side of

the excavation over the clay tile culverts will be covered with 1 ft. minimum

of clean fill material.

Prior to the installation of preload fill placement regrading activities, rock fill will be placed along the toe of a portion of the southwest embankment of the Main Impoundmen t to buttress and improve the slope stabilit y in this area. The portion of the embankment to be buttressed is located between the

outlet of the wood box culvert and the tailings knob which extends out into

the channel as shown on Drawing No. 5344-C2 attached.

Water presently ponded on the southern portion of the Main Impoundment

surface will be removed to facilitate the placement of the preload fill. The

northern and southern areas of the existing pond will be divided by the

construction of an interim dike at the northern edge of the fill placement

area. Once the divider dike has been constructed, water in the southern

portion will be pumped to the northern portion. The divider dike will be

constructed by placing woven geotextile, as necessary for subgrade support,

across the pond and placin g two to three feet of coarse soil material

(subgrade materials removed from TP2/TP3) over the fabric. To maintain an

equivalent storage capacity of the pond followin g fill placement, the

intersection of the access roads to monitoring wells MW11S/D and MW12S/D (currently the low point of the ponded area) will be raised as

necessary to achieve a minimum elevation of 10,114 feet.

During excavation and regrading activities, on-site transport, and placement

of tailin g material, appropriate engineering controls will be maintained to

control storm water runoff and dust generation. Silt fence, or other

temporary sediment control devices, wil l be installed at the base of the

impoundment embankments to be regraded to intercept and retain sediment

in storm water runoff . While dust control wil l not likel y be required in the

excavation and fill placement areas, dust control on the haul route will be

maintained through water application , as necessary.

Several settlement plates will be installed in the fill placement area to

monitor settlement/consolidation of the underlying tailings as a result of the

loading from the fill .

Printed on Recycled Paper
NORTH IMPOUNDMEN T

Construction activities to be performed on the North Impoundmen t would

involve fill placement over the area indicated on Drawing No. 5344-C1

attached. It is estimated that approximately 4,000 cubic yards of fill material

would be required to prevent the accumulation of surface water in this area. T he majority of the fill material (approximately 3,000 cubic yards would be

mine waste material from piles currently being removed under the OU 9 Mine Waste Pile Removal Action. The upper 1 foot of the fill material would

consist of clean fill hauled from the off site source identified in the OU9 Mine Waste Pile Removal Action Work Plan. OU 9 Mine Waste Material has been

selected for use as fill because of the non acid generating potential and

material characteristics which should result in a lower permeability material

due to the finer grain size characteristics compared to the clean borrow fill. T he final regraded surface would be sloped to the south.

B. Applicable or Relevant and Appropriate Requirements (ARARs)

T he ARARs listed on TABLE F.1 AND F.2 will be followed to the extent

practicable. Copies of these Tables are attached.

C. Performance Standards

1. The designed and constructed response action includes provisions to ensure

that there are no visible emissions (dust) during removal activities at the Apache Tailings Impoundments . Dust control on the haul route, and other

areas, wil l be maintained through water application , as necessary.

2. During the excavation, on-site transport, and placement of tailings material,

appropriate engineering controls will be maintained to control storm water

runoff and dust generation, sil t fences, hay bales and/or other sediment

control devices will be used to intercept and retain sediment in storm water

runoff . The sediment control structures will be left in place, as necessary

followin g the completion of excavation. Un-contaminated surface water will

be diverted away from the tailings to minimize contact with tailings .

^*7 Printed on Recycled Paper

8

3. A long-term maintenance program may be implemented if required by the Final Record of Decision for Operable Unit 7 (OU 7) to ensure the long-term

effectivenes s of the response action.

D. Project Schedule

The response action was completed in October 1999.

E. Estimated Costs

Thi s response action is being conducted by ASARCO, Inc.

VII. Expected Change in the Situation Should Action Be Delayed or N ot Taken

If this Time-Critical removal action is delayed, or not taken, exposure of the public

and environment to heavy metals contained in the mine waste located in the Apache Tailings Impoundment s will continue. Without this time-critical response,

release of contaminated tailings into California Gulch and the Arkansas River will

continue to contaminate surface water and groundwater in the area around the Apache Tailings Impoundments.

VIM. Outstandin g Policy Issues

A Record of Decision wil l be issued selecting the final remedial action for Operable Uni t 7 (OU 7) of this Site.

I X. Enforcement

Thi s Time-Critical Removal Action wil l be performed by ASARCO, Inc.

Printed on Recycled Paper
X.. Recommendation

Thi s decision document represents the selected Time-Critical removal action for the Apache Tailings Impoundment s portion of OU 7 of the California Gulch Superfun d Site, in the City of Leadville , County of Lake, State of Colorado. It was developed

in accordance with CERCLA, as amended, and is not inconsistent with the NCR. This decision is based on the Administrative Record for the Site.

Condition s at the Apache Tailings Impoundment s meet the NCR Section

300.415(b)(2) criteria for a removal and I recommend approval of the removal

action.

APPROVAL

C/V\xv4

•r /yyyyM Jt^. M ax hff Dodson Assistant Regional Administrator Offic e of Ecosystems Protection

and Remediation

DISAPPROVA L

M ax H. Dodson Assistant Regional Administrator Offic e of Ecosystems Protection

and Remediation

*-*y Printed on Recycled P»por

10
TABLE 4-2

Summary Of Potential Chemical-Specific ARARS

OU7 - Apache Tailings

RCRA Subtitle C 40 CFR Part 261.4 (bX7)

and RCRA Section 3001

(b) (Bevill Amendment)

No RCRA Subtitle C is not applicable or relevant and

appropriate because the source material (tailing) has been

identified as an extraction or beneficiation waste that is

specifically exempted from the definition of a hazardous

waste.

Clean Air Act, National Primary and Secondary Ambient Air Quality Standards

42 USC Section 7401-7642

40 CFR Part 50

Yes National ambient air quality standards (NAAQS) are

implemented through the New Source Review Program and State Implementation Plans (SIPs). The federal New Source Review program address only major sources.

Emissions associated with proposed remedial action in OU7willbe limited to fugitive dust emissions associated

with earth moving activities during construction. These

activities will not constitute a major source. Federal NAAQS more stringent than State standards may be

applicable. See Colorado Air Pollution Prevention and Control Act concerning applicability of requirements

implemented through the SIP.

J:\5344\5344-4\FS\TAB ARAR.WPD Pige I of 2 MFG, Inc.
TABLE 4-2

Summary Of Potential Chemical-Specific ARARS (continued) OUT - Apache Tailings

. ;

Colorado Air Pollution Prevention and Control Act Regulation No. 8

5 CCR 1001-14;

5 CCR 1001-10 PartC (I) Regulation 8

Yes Regulation 8 sets emission limits for lead. Applicant s are required

to evaluate whether the proposed activities would result in an

exceedance of this standard. The proposed remedial action in OU7 is not projected to exceed the emission levels for lead,

although some lead emissions may occur. Compliance with Regulation 8 will be achieved by adhering to a fugitive emissions

control plan prepared in accordance with Regulation No. 1. This

plan will discuss monitoring requirements, if any, necessary to

achieve these standards.

Colorado Ambient Air Quality Standards

5 CCR 1001 Yes Primary and secondary standards for PM10 in ambient air. Compliance with ambient air standards will be achieved by

adhering to a fugitive emissions dust control plan prepared in

accordance with Regulation No. 1. Thi s plan will discuss

monitoring requirements, if any, necessary to achieve these

standards. _______;_______

J:\5344\5344-4\FS\TAB_ARAR.WPD Page 2 of 2 MFC, Inc.
TABLE 4-3

Summary Of Potential Location-Specific ARARS

OU7 - Apache Tailing

.':.:.:•:•.'..! V JftVMSJTMWfl l Stnndard, RequiVfei

, - , _•..-.-; ' -i.-j ' ;r!*'ifv*i i¥i"<

^4f^'4V". JTW-- • •'• .. • . ;••:', - . • ••.:'/, •

National Historic Preservation Act (NHPA ) I6USC§470etsefl . A

portion of

40 CFR § 6.30l(b)

36 CFR Part 63, Part 65, Part

800

Expands historic preservation programs; requires

preservation of resources included in or eligible for listing

on the National Register for Historic Places (NRHP). Archeological/cultural resource surveys have been

conducted in satisfaction of the requirements of the NHPA. A portion of OU7 (stamp mill site) has been

recommended as eligible for listing on the NRHP. Therefore, the NHPA is applicable.

Executive Order 11593 Protection

and Enhancement of the Cultural Environment

16 USC §470 Yes Directs federal agencies to institute procedures to ensure

programs contribute to the preservation and enhancement

of non-federally owned historic resources. Consultation

with the Advisory Council on Historic Preservation is

required if remedial activities should threaten cultural

resources. Compliance with the applicable provisions of

the order will be achieved by implementing an approved

mitigation plan if cultural resources are threatened, and

through working with the Advisory Council to ensure that

any threatened cultural resources are appropriately

preserved.

T he Historic and Archaeological Data Preservation Act of 1974

16 USC 469

40CFR§6.30l(c ) Yes Establishes procedures to preserve historical and

archeological data that might be destroyed through

alteration of terrain as a result of a federal construction

project or a federally licensed activity program. A cultural

resource survey was completed in OU7 to identify historic

properties which may be affected by remedial activity. Compliance with the Act will be addressed by

implementing an approved mitigation plan, if cultural

resources are threatened.

Historic Sites Act of 1935 16 USC §461-467 No No Preserves for public use historic sites, buildings, and

objects of natural significance. Is potentially applicable if

any site feature is determined to be of natural significance. Compliance with the requirements would be addressed by

the mitigation plan. _____

JA5344\5344-4\FSVrAB ARAR.WPD Page 1 of 4 MFG. Inc.
TABLE 4-3

Summary Of Potential Location-Specific ARARS (continued) OU7 - Apache Tailin g

T he Archeological Resources Protection Act of 1979

16USC§§470aa-4701l No Requires a permit for any excavation or removal of

archeological resources from public lands or Indian lands. May be relevant and appropriate if archeological resources

encountered during remedial activity.

Executive Order No. 11990 Protection of Wetlands

40CFR§6.302(a)an d Appendix A Yes Minimizes adverse impacts on areas designated as

wetlands. Wetlands have been identified in adjacent areas

which may be impacted by the remedial actions. Mitigation of impacts to the adjacent wetlands will be

addressed in the remedial design report for OU7.

Executive Order No. 11988 Floodplai n Management

40 CFR§ 6.302 & Appendix A Y es Pertains to floodplai n management and construction and

impoundments in such areas. OU7 is located within the

flood plain of California Gulch. The remediation must be

conducted to avoid long- and short-term impacts

associated with the occupation or modification of the

flood plain.

Resource Conservation and Recovery Act (RCRA), Subtitle D

40 CFR Part 257, Subpart A, §257.3-1 Floodplains , paragraph (a)

No Y es Provides general classification criteria for solid waste

disposal facilities pertaining to floodplains . As the

remedial actions for OUT may involve establishment of a

solid waste disposal facility , portions of this regulation are

potentially relevant and appropriate. Thi s regulation

prohibits siting a facilit y for treatment, storage, or disposal

of solid waste within the 100-year floodplai n so as to

avoid restriction of the base flood, reduction in temporary

water storage capacity, and washout of solid waste.

Section 404, Clean Water Act (CWA )

33 USC 1251 ct sej.

33 CFR Part 330

Y es Regulates discharge of dredged or fill materials into

waters of the United States. Substantive requirements of

portions of Nationwide Permit No. 38 (General and Specific Conditions) are applicable to OU7 remedial

activities conducted within waters of the United States. The remedial actions will be designed to comply with

these requirements. _________

J:\5344\5344-4\FS\TAB_ARAR.WPD Page 2 of 4 MFO5

 Inc.
TABLE 4-3

Summary Of Potential Location-Specific ARARS (continued) OU7 - Apache Tailin g

Standard, Requiremententer

Fish and Wildlife Coordination Act 16 USC § 661 et sea.

40 CFR § 6.302

Requires coordination with federal and state agencies to

provide protection of fish and wildlif e in water resource

development programs; regulates actions that impound,

divert, control, or modif y any body of water. However,

proposed remedial action activities in OU7 will not affect

fish or wildlife . If it appears that remedial activities may

impact wildlif e resources, EPA will coordinate with both

the U.S. Fish and Wildlife Service and the Colorado Department of Natural Resources.

Endangered Species Act 16USC§I531etseg .

50CFR5§200and402

No No Provides protection for threatened and endangered species

and their habitats. However, site-specific studies did not

document the presence of threatened or endangered

species. If threatened or endangered species are

encountered during remedial activities in OU7, then

requirements of Act would be applicable.

Wilderness Act 16 USC 1311,16 USC 668

50CFR53.50CFR2 7

No No Limits activities within areas designated as wilderness

areas or National Wildlife Refuge Systems.

m

Colorado Register of Historic Places

CRS §§ 24-80.1-101 to 108 Y es Establishes requirements for protecting properties of

historical significance. May be applicable if remedial

actions impact any property listed on the Register of Historic Places.

Colorado Historical , Prehistorical,

and Archaeological Resources Act

CRS §5 24-80-401 to 410

1301 to 1305

No Yes Concerns historical, prehistorical, and archaeological

resources; applies only to areas owned by the State or its

political subdivisions. May be relevant and appropriate if

remedial action impacts an archaeological site. '

Colorado Species of Special Concern and Species of Undetermined Status

Colorado Division of Wildlife Administrative Directive E-l,

1985, modified

No No Protects species listed on the Colorado Division of Wildlife generated list Urges coordination with the Division of Wildlife if wildlife species are to be impacted. No evidence of species of special concern have been

identified at this site.

J:\5344\5344-4\FS\TAB ARAR.WPD Page 3 of 4 MFC, Inc.
TABLE 4-3

Summary Of Potential Location-Specific ARARS (continued) OU7- Apache Tailing

Nongame, Endangered or Threatened Species Act

CRS §5 33-2-101 to 108 No No Standards for regulation of nongame wildlife and

threatened and endangered species. Site-specific studies

did not document the presence of threatened or

endangered species. If threatened or endangered species

are encountered during remedial activities in OU7, then

requirements of Act will be applicable.

Colorado Natural Areas Colorado Revised Statutes, Title 33 Article 33, Section 104

No No Maintains a list of plant species of "special concern." Although not protected by State statue, coordination with Division of Parks and Outdoor Recreation is

recommended if activities will impact listed species.

Colorado Solid Waste Disposal Sites and Facilities Act

6 CCR 1007-2

6 CCR 1007-2, Part I

No Yes Establishes regulations for solid waste management

facilities, including location standards. As the remedial

actions for OU7 may involve establishment of a solid

waste disposal facility, portions of this regulation are

potentially relevant and appropriate. ____. ___

J:\5344\5344-4\FS\TAB_ARAR.WPD Page 4 of 4 MFO, Inc.
> TABLE 4-4

Summary Of Potential Action-Specific ARARS

OU7-Apache Tailings

Solid Waste Disposal Act as

amended by the Resource Conservation and Recovery Act of

1976(RCRA)

40 CFR Part 257, Subpart A: §257.3-1 Floodplains, paragraph (a); §

257.3-7 Air, paragraph (b)

Yes Selected portions of Part 257 pertaining to floodplain s and air

are applicable. These provisions establish criteria for

classification of solid waste disposal facilities and practices. The

applicable requirements will be addressed by the remedial

designs.

Hazardous Materials Transportation A ct

49 USC §1801-1813

49 CFR 107,171-177

No No Regulates transportation of hazardous materials. Proposed

remedial action in OU7 will be conducted will not entail off-site

transportation of hazardous materials. '

\*, t .. • , , . • . . _ .,--.

Colorado Air Pollution Prevention

and Control Act, Fugitive Dust Control Plan/Opacity Regulation No. I

5 CCR 1001-3; Section III.D. 1. b,c,d Sections II.D.2.b,c,e,f,g Regulation 1

Yes Regulation No. I provisions concerning fugitive emissions for

construction activities, storage and stockpiling activities, haul

roads, haul trucks, and tailing ponds are applicable (5 CCR

1001-3; Sections II.D.2.b,c,e,f,g). Construction activities in OU7 will be conducted in accordance with a fugitive emissions

control plan. ______

Colorado Air Pollutio n Prevention

a nd Control Act, APENs Regulation No. 3

Colorado Air Pollution Prevention

and Control Act, Odors Regulation No. 2

5 CCR 1001-5 Regulation 3

5 CCR 1001-4 Regulation 2

Yes

Y es

Substantive requirements of an Air Pollutio n Emission Notice (APEN) are applicable if the removal actions disturb

contaminated soil. An APEN will be filed, although permitting

requirements such as this are typically not required under CERCLA. Applicable only if remedial action activities cause objectionable

odors. Remedial action in OU7 is not expected to produce

odors.

J:\5344\5344-4\FS\TAB_ARAR.WPD Page 1 of 3 MFC, Inc.
TABLE 4-4

Summary Of Potential Action-Specific ARARS (continued) OUT-Apache Tailin g

Colorado Hazardous Waste Regulations

Colorado Solid Waste Disposal Sites and Facilitie s Act

Colorado Water Quality Control Act, Storm Water Discharge Regulations

Colorado Mined Land Reclamation A ct

6 CCR1007-3, Part 264: Section 264.30 l,(g),(h),(i), and

0); Section 264.310, (aXO

through (aX4); Section 264.310, (bXO and

(bX5)

6 CCR 1007-2

5 CCR 1002-2

CRS 34-32-101 to 125 Rule 3 of Mineral Rules and Regulations

No

Yes

No

Yes

These specific provisions of the hazardous waste regulations

may be relevant and appropriate for conducting remedial actions

in OU7. Specific provisions of Section 264.301 concern run-on

control, run-off control, management of run-on and run-off

control systems, and wind dispersal. Thi s regulation requires

run-off control for the 100-year, 24-hour storm. Specific

provisions of Section 264.310 concern placement of a cover to

minimize infiltration , minimize maintenance, promote drainage

and minimize erosion, and accommodate settling. Post-closure

requirements are also included in this regulation to: maintain

integrity and effectiveness of the final cover by making repairs,

as necessary; and prevent erosion of the final cover. ____^

Establishes standards for licensing, locating, constructing and

operating solid waste facilities . Thi s regulation is potentially

relevant and appropriate if the remedial actions include

establishment of a solid waste disposal facility . Thi s regulation

includes restrictions and site standards to address: protection of

the facility from wind; minimization of runon from upgradient

areas; isolation of the public and environment; engineering

design requirements; and stability of the final surface.

Establishes requirements for storm water discharges (except

portions relating to Site-wide Surface and Groundwater). Substantive requirements for storm water discharges associated

with construction activities are applicable.

Regulates all aspects of land use for mining, including the

location of mining operations and related reclamation activities

and other environmental and socio-economic impacts. Substantive requirements of selected portions of Rule 3 regarding Reclamation Measures (grading, erosion and filtration

control, and handling of acid-forming or toxic materials); Water

- General Requirements (hydrology, dredge and fill, and slope

stabilization, except portions relating to Side-wide Surface and Ground Water), Wildlife, and Revegetation are potentially

relevant and appropriate.

J:\5344\5344-4\FS\TAB_ARAR.WPD

Page 2 of 3 MFG. Inc.
TABLE 4-4

Summary Of Potential Action-Specific ARARS (continued) OU7 - Apache Tailing

Colorado Noise Abatement Act CRS55 25-12-101 to 108 Y es Established maximum permissible noise levels for particular

time periods and land use related to construction projects.

Regulations on the Collection of Aquatic Life

2CCR406-8,Ch. 13, Article HI, Sec. 1316

No No Requirements governing the collection of wildlife for scientific

purposes. Remedial activities within OU7 will not include

biological monitoring. ___

J:\5344\5344-4\FS\TAB ARAR.WPD Page 3 of 3 MFG. Inc.
providin g environmental

consulting and

engineering services

49OO Pearl East Circle Suite 3OOW Boulder. Colorado 8O3O1

303/447-1823 Fax:447-1836

McCulley Rrick &. Gilman. me.

September 23,1998 M FC Project No. 5344.2

M s. Austin N. Buckingham Colorado Department of Public Health and Environment Hazardous Materials and Waste Management Division

4300 Cherry Creek Drive South Denver, CO 80246-1530

R E: TRANSMITTAL OF JUNE 1998 MONITORING DATA OPERABLE UNIT 7 (OUT) - APACHE TAILINGS CALIFORNIA GULCH SUPERFUND SITE,LEADVILLE , COLORAD O

02 rr:

c_. > ...., .

roCO

•nCO

Dear Austin:

McCulley , Frick & Gilman , Inc. (MFG) is pleased to provide three copies of tables summarizing

field parameter measurements and validated surface water and groundwater quality data from the November

1996, Jun e 1997, November 1997 and June 1998 monitoring events at the Apache Tailings area. The

attached surface water quality data table includes information for station TPD, a spring where groundwater

discharges to the surface in the vicinity of the southwestern corner of former Tailings Pond No.3. Also

enclosed is a table which summarizes monthly water level measurements made in monitoring wells and

piezometers within and near the Apache Tailings Impoundment since November 1996. If you have any

questions, please do not hesitate to call.

Sincerely, MCCULLEY, FRICK & GILMAN, INC.

GSD/BVC/sjb

attachment

cc: Russ Alien , CDPHE Tom Hesemann. RMC Robert Litle, Asarco Paul Rosasco, EMSI Gary Slifka, Asarco Rebecca Thomas, EPA Sherm Worthington. SMI

Bence V. Close, P.E. Associate Engineer/Geohydrologist

J:\S3*4\COMM\ABUCKI3.LTR
Table! GROUNDWATER QUALITY DATA (11/96, 6/97,11/97 AND 6/98) O U7 - APACHE TAILINGS

SAMPL E LOCATION —————— ""

— — ——— — HYPROGEOLOGIC UNI T L AB NUMBER ~ ———— — _ ————— — SAMPL E NUMBER — — —————— — SAMPLE DATE ______ ~ Field Parameters ' ——— — ——— — - ——— —

pH (units) Conductivity @25C(umhos/cm) Major Constituents and Inorganics Bicarbonate (mg/L) Carbonate (mg/L) Calcium (mg/L)

.Chloride (mg/L) Fluoride (mg/L ) Magnesium (mg/L ) Nitrite as N (mg/L) Nitrate as N (mg/L) Nitrate/Nitrite as N (mg/L) ' Potassium (mg/L) Sodium (mg/L) Sulfate (mg/L ) Phosphorus, dissolved (mg/L) Phosphorus, ortho dissolved (me/L) Metals, Dissolved Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L)

3ther Water Quality Parameters Total Alkalinity as CaC03 (mg/L) Cation-Anion Balance (%) Dissolved Organic Carbon (DOC) (mg/L) Hardnes s as CaC03 (mg/L) Hydroxide as CaCO3 (mg/L) Residue, Filterable (TDS) (mg/L) Residue. Non-Filterable fTSS) (me/L)

L11863-20

M-AP1TMW1-OI-1124M 11/14/96

3.22

3480

2 U

2 U jj\j

9

0.1 U

400

0.01 UJ

0.81

0.8 J

20 U

201

4400

0.005 UJ

0.032 J

0.02 U

0.256

0.42

460

0.575

369

217

2 U

12.1

2 J 2970

2 U

6950

L1424346

M-APITMWI-OMlJt T

06/12/97

3.92

3260

2 U

2 U

419

8.7O.I J

274

0.07

0.61

0.61

5

13

1860

0.022)

0.005 UJ

0.002 J

0.127

0.25

34.3

0.297

79.5

83.8

2 U

16

1 J 2170

2 U

3820 J

L16520-04

M-APITMWI-OMIKW 7

11/20/97

3.90

4110

2 U

2 U

494

12 NM

351 NMNM

0.02 U

5

15

3630

0.020 NM

0.001 U

0.260

0.25

294

0.220

266

182

2 U

10.7 NM

2680

2 U

5290

— — —

 N M

L19059-04

M-APITMWI-«14M1|

06/18/98

2.61

4330

2 U

2 U

372

12 NM

258 NMNM

0.03 J

3.9

13.4

2860 NMNM

0.005 U

0.161

0.36

106

0.575

212

134

2 U

4.2 NM

1990

2 U

4470

.

L11819-07 —— — M-AF1TMWMIM1I9M

11/19/M

6.41

803

47

2 U

118

3 J 0.1 U

49.6

0.01 U

0.62

0.62

1.8

6.6.

450

0.008 J

0.005 U

0.005 U

0.002 J 0.01 U

0.02 J

0.001 U

1.53

0.93

47

0.3 U

1 J

499

2 U

720

U • Not deaatd « the tallow) method dmctin Ihak (MWJ. J * Eftlnutttf .

0» « UiKfcucud H adBMBd MDL. NM - N« memnd.

• " Modiwrhii wril AP1TMW} WB nmpM to December I9M mker dm Novtmter 19K dwb| the low flow mm.

r 1997.

L14243-07 M-AP1TMWJ-OMIM7

6.43

765

48

2 U

103

5.1

0.1 U

42.5

0.02 J 1.04

1.06

i:6

6.4

410 J 0.005 U

0.005 UJ

0.002 U

0.001 J 0.01 U

0.01 J

0.000 U

1.44

0.76

48

-3.7

1 U

432

2 U

640 J -LQJ

AP11 A Hu

1297

"MW2

vhim L16S20-01 M-AP1TMWJ-01.1IM97

11/20/97

6.27

860

46

2 U

132

6 NM

52 NM NM

1.32

2

7

450 NMNM

0.001 U

0.020 U

0.05 U

0.05 U

0.001 U

1.89

0.84

46

3.6 NM

544

2 U

680 NM

L19059-06

M-AP1TMW2-OI-M«I|

06/18/98

6.01

940

43

2 U

108

9 NM

42.8 NMNM

1.68

1.8

6.7

370 NMNM

0.002 U

0.0006 J 0.01 U

0.04 J

0.0004 U

1.89

0.56

43

2.2 NM

446

2 U

690 NM

Mcioimicii AP1PZI9. AP1PZM mi APIPZII

JM\9«SAMP\MFGGW.WB I P ap I of I] 09/23/98
Table 1 GROUNDWATER QUALITY DATA (11196,6/97,11/97 AND 6/98) O U7 - APACHE TAILINGS

HYDROGEOLOGIC UNIT L AB NUMBER

SAMPLE NUMBER SAMPLE DATE Field Parameters

pH (units) Conductivity ®25C (umhos/cirt) Major Constituents and Inorganics Bicarbonate (mg/L) Carbonate (mg/L) Calcium (mg/L) Chloride (mg/L) Fluoride (mg/L ) Magnesium (mg/L) Nitrite as N (mg/L) Nitrate as N (mg/L) Nitrate/Nitrite as N (mg/L) Potassium (mg/L) Sodium (mg/L) Sulfate (mg/L ) Phosphorus, dissolved (mg/L) Phosphorus, onho dissolved (mg/L) Metals, Dissolved . Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Other Water Quality Parameters Total Alkalinit y as CaCO3 (mg/L) Cation-Anion Balance (%) Dissolved Organic Carbon (DOC) (mg/L) Hardness as CaCO3 (mg/L) Hydroxide as CaCO3 (mg/L) Residue, Filterable (TDS) (mg/L) Residue. Non-Filterable (TSS) (mg/L)

L12145-01

M-AnTMW3-M'UI7M 12/17/96

5.50

441

69

2 U

58.9

9.4

0.1 U

22.2

0.01 U

2.59

2.59

1.2

4.9

133

0.005 UJ 0.022 J

0.002 U

0.000 U

0.01 U

0.01 J

0.000 U

0.025

0.06

69

4.1

1 U

238

2 U

300

8 J

AP1TMW3*

LI 41434)3

M-APITMWMMUtT

06/12/97

6.41

420

70

2 U

52.7

9.3

0.1 U

22.1

0.01 U

2.79

2.79

1.1

5.1 J 130 J 0.0161

0.009 J

0.002 U

0.000 U

0.01 U

0.01 U

0.000 U

0.008 J

0.06

70

1.2

1 U

223

2 U

290 J

61

None NofSunpln l

11197

NMNM

NM NMNMNM NMNMNMNM NMNMNM NMNM NM

NMNMNMNMNMNMNM

NMNMNMNM NMNMNM

None NMSmpM 6/98

NMNM

NMNMNPIIVMI

NPtIVMI NMNM NMNMNMNM NMNMNMNM

NMNM NMNMNMNMNM

NMNMNM NMNMNM NM

AP1TMW7

L11808-02

M-AP1TMW74I-HIIM 11/18/96

7.46

736

121

2 U

94.1

9

0.1 U 10 ft jy.o

0.01 U

2.65

2.65

1.3

4.3

frnZ jU

0.015 J

0.005 U

0.001 U

0.000 U

0.01 U

0.01 U

0.000 U

0.005 U

0.01 U

121

0.5

1 U

399

2 U

520

5 U

LI4258-04

M-APlTMWT-OMIWr

^

06/13/9? •.

7.41

805

118

2 U

89.5

11.8

0.1 U

38.2

0.01 U

2.54

2.54

1.3

4.3

220

0.015 J . 0.008 J

0.001 J

0.000 J

0.01 U

0.01 U

0.000 J

0.005 U

0.01 J

118

2.2

1 U

381

211

520

5 U

None NMSmpM 11/97

NMNM

NM NMNMNMNM NMNM . NM NMNMNMNMNMNM

NMNMNP IMM NMNMNMNM

NMNMNMNMNMNMNM

None MMSunpM 6/98

NMNM

NMNMNMNMNM NMNM NMNM NMNM NMNMNM

NMNMNMNMNMNMNM

NMNMNMNMNMNM

• NM

Nota: . • . U • Not deaxttd « 0* Miami method datedon link <MDL). I - Enhnted. UJ • Undetected « admed MDL. , NM - N<x mamrcd.

• • Matorini wdl APITMW3 wu nnpM In December 1996 inker tfan November 1996 M* the kw flow mm. DM for noakorin* weto NWJA. HW5C ml NWJD coWcori 11*6 ad 6/97 were (mNkfedbr WESTEOlWfcoir e

naoaBen ATIPZM. APIPZIO ind AP1PZ11 wife tamlhd darfe« iificinbir 1997.

J:\53WW8SAMP\MFGGW.WB 2 09/2341
Table! GROUNDWATER QUALITY DATA (11/96,6/97,11/97 AND 6/98) O U7 - APACHE TAILINGS

HYDROGEOLOGT C UNIT L AB NUMBER

SAMPL E NUMBER

pH (units) Conductivity ®25C (umhos/cm) Major Constituent and Inorganics Bicarbonate (mg/L) Carbonate (mg/L) Calcium (mg/L) Chloride (mg/L) Fluoride (mg/L ) Magnesium (mg/L) Nitrite as N (mg/L) Nitrate as N (mg/L) Nitrate/Nitrite as N (mg/L) Potassium (mg/L) Sodium (mg/L) Sulfate (mg/L ) Phosphorus, dissolved (mg/L) Phosphorus, ortho dissolved (nw/L) Metals, Dissolved Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Qlh«r Water Quality Parameters Total Alkalinity as CaC03 (mg/L) Cation-Anion Balance (%) Dissolved Organic Carbon (DOQ (mg/L) Hardness as CaC03 (mg/L) Hydroxide as CaC03 (mg/L) Residue, Filterable (IDS) (mg/L) Residue. Non-Filterable (TSS1 (mg/L)

L1I863-22

M-AP1TMW9-M-11MM

11/24/96

6.55

9530

101

2 U

411

11

0.9

. 2092

0.05 J 0.02 U

0.02 U

70

6 J 9100

0.005 UJ 0.025 J

0.02 U

0.008 I

0.1 U

28.5

0.004 U

6.51

0.1 U

101

0.7

12

9630

2 U

12200

8 J

APITMW*

L14258-1S

M-AP1TMWOMHt7

06/14/97

6.62

8760

94

2 U

410

7 J

1

1820

0.01 U

0.02 U

0.02 U

61

61

9060

0.034 J

0.005 UJ

0.01 J

0.002 J O.I V

21.1

0.002 U

13.3

0.4 J

94

-5.1

9

8510

2 U

11800

61

None N ot SwipM 11/97

NMNM

NMNMNM

• NM MPfiVMI NMNMNMNM NMNMNMNM NM

NMNMNMNMNMNMNM

NMNMNMNM NMNMNM

None N ot Smpltd

6/98

NMNM

NMNMNMMM NMNMNM NMNrvivMi NM

NP«MMNI NMM NMNMNM

NMNMNMNMNMNMNM

NMNM NMNMNM NMNM

AP1TMW11S Toll!TM L11S63-U M-AP1TMWI IS4M1MK 11/24/96

6.50

6670

383

2 U

443

6

0.3 J 1228

0.08 J n oj u.o^

0.92

70

24

5600

0.007 J

0.005 UJ

0.02 U

0.040

0.04 U

10.1

0.004 U

65.6

65.1

383

2.9

4 J

6150

2 U

7800

52

L142S8-17

M-APtTMWtlS-OM14»7

06/14/97

6.32

6620

181

2 U

432

7 J 0.1 J 1170

0.05

1.86

1.86

67

19

7470

0.286

0.007 J

0.005 J 0.040

0.05 U

216

0.026

49.1

51.3

181

-8.1

4 J

5890

2 U

8810

30

L16549-14

M-AMTMWI 1fr«|.| 12397

11/23/97

6.47

5220

428

2 U

420

8 NM

1030 NM NM

1.26

62

23

4800 NMNM

0.001 U

0.040

0.77

nu.o Av O

0.004

43.4

en o JV.O

428

1.3 NM

5280

2 U

7800 NM

L19080-13

M-APITMWllSlMMl l

06/21/98

6.24

7180

474

2 U

450

6 NM

1150 NMNM

2.09

63.3

26.6

5520 NMNM

0.02 U

0.087

0.39

0.09

0.0006 J 68.8

78.4

474

0.4 NM

5850

2 U

8460 NM

Hour. V - Not detected « 0* tadlcro) method dcKtfm Itak (MDU. J-E«lmned. UJ • UmtaecialiiatkBaul MDL. NM • Not Bwuwcd.

• " Mmtarint wdl APITMW3 wti nmptol la Dccttnber 1996 niter *K> Mpvembcf 1996 dnriiif ite low flew m«.

Ptennaen AP1PZI9. APIFZM ind APIPZ2I woe tattlM ddttaf Stamibcr 1997.

t\5344\9ISAMP\MFGGW.'WB l Tiff 3 ef 13 09/J3/M
Table 1 GROUNDWATER QUALITY DATA (11/96,6/97,11/97 AND 6/98) O U7 - APACHE TAILINGS

HYDROGEOLOGIC UNIT L AB NUMBER SAMPL E NUMBER

SAMPLE DATE

pH (units) Conductivity ®25C (umhos/cm) Major Constituents and Inorganics Bicarbonate (mg/L) Carbonate (mg/L) Calcium (mg/L) Chloride (mg/L) Fluoride (mg/L) Magnesium (mg/L) Nitrite as N (mg/L) Nitrate as N (mg/L) Nitrate/Nitrite as N (mg/L) Potassium (mg/L) Sodium (mg/L) Sulfate (mg/L) Phosphorus, dissolved (mg/L) Phosphorus, ortho dissolved (mg/L) Metals, Dissolved Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) , Zinc (mg/L) Other Water Quality Parameters Total Alkalinity as CaC03 (mg/L) Caiion-Anion Balance (%) Dissolved Organic Carbon (DOC) (mg/L) Hardness as CaCO3 (mg/L) Hydroxide as CaCO3 (mg/L) Residue. Filterable (IDS) (mg/L) Residue Non-Filterable (TSS) (mc/Ll

L11863-17

M-APITMW11M1.11MK

11/24/96

3.84

1210

57

2 U

134

1 J 0.1 J 67.1

0.01 UJ 6.3

6.3

2.8

5.1

600

0.005 UJ

0.005 UJ

0.005 U

0.071

0.01 U

4.55

0.086

18.7

30.6

57

2.9

2 J 611

2 U

1000

8 J

AlliitflmM

LI 4258-16

M-AFlTMWUI>41-«1tf7

06/14/97

6.31

1375

71

2 U

164

2.1 J 0.1 J

80.9

0.01 U

0.02 U

0.02 U

3

5.8

730

0.026

0.05 J

0.003 J 0.071

0.01 U

6.56

0.108

22.5

33.4

71

3.9

1 J

742

2 U

1220

8 J

U 6549-1*

l*AflTMW1ID-01-IIJ3»7

11/23/97

6.93

1134

74

2 U

152

2 NM

73 NMNM

0.02 U

2.9

4.6

660

0.010 U NM

0.001

0.067

0.01

5.67

0.115

18

31.4

74

3.4 NM

680

2 U

1020 NM

L19080-15

M-AMTMWllMI-Mai

06/21/9*

6.42

1520

57

20

166

1 J NM

80.3 NMNM

0.23

2.7

4.1

730 NMNM

0.005 U

0.072

0.01 U

8.45

0.098

21.8

36.1

57

5.2 NM

745

2 U

1230 NM

LI 1863-18

M-Ar1TMWIlS-OI-tl24K 11/24/96

6.17

8430

122

2 U

404

14

0.8

1661

0.08 J

0.02 U

0.02 J 87

14

7800

0.005 UJ

0.005 UJ

0.05 U

0.020 J

0.05 U

132.0

0.010 U

16.9

2.82

122

0.3

6

7840

2 U

10460

58

AP1TMW12S

,— • _____ Tallin n L14258-20

M-AP1TMW11S41.4MV7

06/14/97

6.84

8640

51

2 U

417

7 J

0.7

1660

0.01 U

0.15

0.15O ft 7D

13

7570

0.193

0.005 UJ

0.02 U

0.004 U

0.1 U

201

0.009 J

17.2

2.8

51

3.6

6

7870

2 U

11100

40

L16549-17 M-AP1TMW1JS4I-1IH»7

6.21

6800

53

2 U

412

14 MP*MM

1600 NM . IN MMM

0.58 U

98

12

7530

MrtpfMl NM

0.003

0.030 U

0.1

221

0.006

18

3.1

53

2.4 NM

7610

2 U

10700 NM

L19080-12 M-AnTMWI2S4l-»Ml t

5.59

9350

14

2 U

386

13 NM

1620 NM

Ni NMM

0.16

no Q yo.y

11.7

7690 NMNM

0.02 U

0.004 U

0.05 U

212

0.004 U

17.3

3.09

14

1.8 NM

7620

2 U

11700NM

Nwa: U - MM dctecMd «tta tadtcned method .toeotoa Dak (MDL). J . Enhnted. UJ • UndetectedMcBknmdMDL. NM - N« wound.

• • Monhoriif wrt APITMW3 wu ampfed ta December 1996 nttar An November 1996 dnrfaf die low (Vnr mm. Dm fiv mdwliit wdlf NWJA, NW5C nd NWJD ctOeatt I t/M nd «VW xtre pravkfad bj WESTEC; «WT dn m me nltdntd.

naomaai AP1FZI*. AP1FZ20 ind APIPHI «m tanned dnht Sq»raber 1997.

J:\J3W19JSAMinMFOGW.WB I Pijc 4 of 13 0903/98
Table 1 GROUNDWATER QUALITY DATA ai/96,6/97,11/97 AND «/98) O U7 - APACHE TAILINGS

_ __ HYDROGEOLOG1C UNIT ___ L AB NUMBER " ——— — SAMPL E NUMBER

SAMPL E DATE

pH (units) Conductivity @25C (umhos/cm)

4ajor Constituents and Inorganics Bicarbonate (mg/L ) Carbonate (mg/L) Calcium (mg/L) Chloride (mg/L ) Fluoride (mg/L ) Magnesium (mg/L) Nitrite as N (mg/L) Nitrate as N (mg/L) Nitrate/Nitrite as N (mg/L) » Potassium (mg/L) Sodium (mg/L) Sulfate (mg/L ) Phosphorus, dissolved (mg/L) Phosphorus, ortho dissolved (mg/L)

letals, Dissolved Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) . . . Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Mher Water Quality Parameters Total Alkalinity as CaCO3 (mg/L) Cation-Anion Balance. (%) Dissolved Organic Carbon (DOQ (mg/L) Hardness as CaC03 (mg/L) Hydroxide as CaC03 (mg/L) Residue, Filterable (TDS) (mg/L) Residue. Non-Filterable (TSS) ftng/L)

L11863-21

KMP1TMW1UVOI-IU4K 11/24/96

5.49

1780

2 U

2 U

196

2 J

0.1 U

101.0

0.02 J

6.5

6.5

6.6

9.9

1030

0.014 J

0.005 UJ

0.005 U

0.034

0.04 J 23.7

0.019

37.2

19.0

2 U

2.4

3 J

905

2 U

1550

54

Alluvium

Li L 4jM0*l ^ M-AP1TMWUD41414*?

06/14/97

6.52

1750

14

2 U

113

2.3 J O.I U

86.8

0.01 U

0.22

0.22

6

11.7

1020

0.035 J

0.011 J

0.004 J

0.002

0.01 U

163

0.001 J

46.1

27.1

14

9.4

2 J

639

2 U

1760

106

MQaw M-Af1TMWtlIM».112M7

11/23/97

6.10

1252

15

2 U

96.3

2 NM

69.9 NMNM

0.22 U

5.1

11.3

800 NMNM

0.001 til

0.008

0.01 U

139

0.001 '

36.3

20

15 J 11.8 NM

528

2 U

1270 NM

L190804M

M-AP1TMWI2D-01-9M21

06/21/98

6.01

1620

6 J

2 U

79.2

3 J NM

58.9 NMNM

0.22

4.9

6.3

650 NMNM

0.006 J 0.0004 U

0.01 U

107

0.0005 J

31.4

17.9

6 J 12 NM

440

2 U

1210 NM

AP1TMW13S

L11819-02 MWIP1TMWUS4MIM M 11/19/96

6.88

688

86

2 U

82.2

2 J 0.1 U

33.5

0.01 U

0.04 J 0.04 J

1.3

2.5

*MA ' 0.005 U

0.005 UJ

0.005 U

0.077

0.01 J 0.01 U

0.023

0.285

11

86

0.6 U

1 J

343

2 U

460

L14258-18

M-AP1TMWIJMMI497

06/14/97

7.16

453

108

2 U

54.8

1.2 J 0.1 J

22.6

0.01 U

0.02 U

0.02 U

1.1

2

140

0.016 J

0.005 UJ

0.001 J 0.034

0.01 U

0.08

0.031

0.209

f JM

108

-2.1

1 U

230

2 U

330

L16520-08 M-AP1TMWIJMM1JW 7

11/20/97

6.54

612

92

2 U

73.8

1 NM

30.5 NMNM

0.02 U

1.3

2.5

230 NMNM

0.001 U

0.071

0.01 U

0.02

0.037

0.118

7.4

92

1.5 U NM

310

2 U

Aff\

L19059-11 M-APITMWUS41-9M19

06/19/98

6.48

664

115

2 U

69.2

1 NM

29.3 NMNM

0.02 U

1.3

2.2

190 NMNM

0.002 U

0.0394

0.01 U

0.42

0.0488 .

0.264

7.52

115

-0.8 NM

293

2 t i

370

Haa: : . V - NM detected M the bdktted method deuetkm nmk (MDL). J-Eatanttd. VI - Undetected K attained MDL. NM - Not rawed.

»• MMkortai writ AP1TMW3 wii nmpted ta December 1996 ratter dm November 1996 <M« die tow flow even. Dm for nMkorii« weft HW3A. NWJC ind NWJD oHhded 11/96 aid 6W7 wen pimHdcd by WESTEC: «97 4n m m nlktaed. Ptenmem APIPZ19, AP1PZ20 and AP1PZ2I were (mailed Atrint Sepmber 1997.

3«\9JSAMP\MFOCJW.WB 2 Pijc 5 or 13
Table 1 GROUNDWATER QUALITY DATA (11/96,6/97,11/97 AND 6/98) O U7 - APACHE TAILINGS

HYDROGEOLOG1C UNIT L AB NUMBER " —————— — SAMPL E NUMBER — — ————— — — ——— — SAMPLE DATE Field Parameters " ——— — —————— —

pH (units) Conductivity ®25C (umhos/cm) Major Constituents and Inorganics Bicarbonate (mg/L) Carbonate (mg/L) Calcium (mg/L) Chloride (mg/L) Fluoride (mg/L) Magnesium (mg/L) Nitrite as N (mg/L) Nitrate as N (mg/L) Nitrate/Nitrite as N (mg/L) Potassium (mg/L) Sodium (mg/L) Sulfate (mg/L ) Phosphorus, dissolved (mg/L) Phosphorus, ortho dissolved (mt/L) Metals, Dissolved Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Other Water Quality Parameters Total Alkalinity as CaCO3 (mg/L) Cation-Anion Balance (%) Dissolved Organic Carbon (DOC) (mg/L; Hardness as CaCO3 (mg/L) Hydroxide as CaC03 (mg/L) Residue, Filterable (TDS) (mg/L) Residue. Non-Filterable fTSS) (me/L)

>

L11819-01

M-AF1TMWI3MM1I»M 11/19/9*

7.19

938

123

2 U

120

3 1 O.I U

51.3

0.01 U

0.26

0.26

1.5

6.4

370

0.007 i

0.005 UJ

0.005 U

0.002 J 0.01 U

0.01 J 0.001 U

0.304

0.01 U

123

1I U

511

2 U

670

IP1TMW13D AOti L142S8-19

M-APITMWHMMMH M/14/97

7.08

800

122

2 U

111

2.3 J

0.1 U

48.5

0.01 U

0.2

0.2

1.4

5.5

350

0.017 J

0.005 UJ

0.001 U

0.000 J

0.01 U

0.01 U

0.000 J 0.043

0.01 J

122

-0.3

1 U

477

2 U

680

vhn

. none NM&mpfed

11/97

NM NM

NM NM NMNMNMNMNM

I tM NM

i NM

NMNMNM

NM NMNMNMNMNMNM

NMNM NMNM ' N M NM

None MM SmfM X/t t ——— — =25 ——— — NMNM

NM NMNMNM NMNMNM NMNMNM NMNMNM NM

NM NMNM NMNM NMNM

NMNMNMNMNMNM

— ^^~«— i«<^^——

L1184S-15 M-AP1TMWI4S.4MIMM 11/M/M

2.17

28190

2 U

2 U

510

6

0.1 U

510

0.01 UJ 0.4 U

0.4 U

30 U

3 0U

60800

68.800 J

49 J

48.9

10.200

47

27167

0.090 J

773

1639

2 U

11.7

112

3370

2 U

103390

— —— »»••

U • Not dcttcud tt the Wlottd method **edo» link (MDl). I-EMmmd. J--Eflfm«ed,HM«Ik>w . UI-UndeBcudi l attend MDL. ' •

NM * NM mcMwcd.

• - Monkortaf wdl APITMW3 wu nnipM In Decanto I9K mtar da. November 1996 dntfa|tke low flow MM.

L142S8-11

3.02

33500

2 U

2 U

470

500 U

0.1 U

460

0.5 U

5

5

30 U

30 U

57400

11.500 J

31 J

20.1

7.630

46

26000

0.030 J

505

1420

2 U

11.6.

90

3070

2 U

95900

AP1TMW14S Alluvium

l-t\H7 L16549-08

M-AHTMWI4S4>l-tm»7 11/22/97

2.67

30000

2 U

2 U

510

50 NM

470 NM NM

4 J

30 U

30 U

65800

15.000 NM

0.001

6.600

20

29900

0.005 U

682

1600

2 U

11.8 NM

3210

2 U

112000 NM

L19080-OS

M-APITMWI4Stt.wat

06/20/98

1.65

30300

20 UJ

20 UJ 470

12 NM

470 NMNM

0.9 J

60 U

60 U

62200 NMNM

8.3

5.34

30

26500

0.020 U

571

1330

20 UJ 8.4 NM

3110

2 0U

102000 J - NM

nuamn AP1PZI9. AHPZ20 ind APIFPI wtn fcaadcd M* StfMutii , 1997.

I:\5344\9tSAMF\MFGGW.WB2
Table 1 GROUNDWATER QUALITY DATA (ll/9«, 6/97, 11/97 AND «/98) O U7 - APACHE TAILINGS

SAMPL E LOCATION HYOROGKOLOGI C UNIT L AB NUMBER

SAMPL E NUMBER ——————— — ' _ ——— : _____ SAMPLE DATE _____ Field Parameters "~ — ————— —

pH (units) .

u. ^

 Con()uMivity ®25C (umhos/cm) Major Constituents and Inorganics Bicarbonate (mg/L) Carbonate (mg/L) Calcium (mg/L) Chloride (mg/L) Fluoride (mg/L ) Magnesium (mg/L) Nitrite as N (mg/L) Nitrate as N (mg/L) Nitrate/Nitrite as N (mg/L) Potassium (mg/L) Sodium (mg/L) Sulfate (mg/L ) Phosphorus, dissolved (mg/L) Phosphorus, ortho dissolved (me/L) MeUls, Dissolved «*Mmg/M

Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Other Water Quality Parameters Total Alkalinity as CaCO3 (mg/L) Cation-Anion Balance (%) Dissolved Organic Carbon (DOQ (mg/L) Hardness as CaC03 (mg/L) Hydroxide as CaC03 (mg/L) Residue, Filterable (TDS) (mg/L) Residue. Non-Filterable fTSS) (mg/L)

LH845-1C M-AHTMWMMMIM M 11/20/96

4.65

2430

2 U

2 U

216

23

0.4 I

137

0.48 1

1.79

2.27

8 U

2 8 J 1590

0.022 J

0.005 UJ

0.005 U

0.300

0.11

47.4

0.004]

213

45.6

2 U

11.1

21

1100

2 U

2550

AP1TO Allu L1425S-06

M-APITMWI4IVM.41397

06/13/97

5.26

1700

2 U

2 U

155

23.1

0.3 J

96.2

0.3

4.7

5

3.8

20.9

1020

0.032

0.005 UJ

0.002 U

0.184

0.06

25.1

0.005

119

29.5

2 U

10.3

1 J

783

2 U

1710

5 U

IW14D

L16549-07 M-Ar1TMWI4D-»l-IIII»7

11/21/97

4.08

1591

2 U

2 U

156

24 NM

84.1 NMNM

5.3 J 2.8

19.8

980

0.010 U NM

0.001 U

0.180

0.07

16.6

0.003

111

24

2 U

8.1 NM

736

2 U

1600 NM

L19080-01

M-APITMW|4Ml^tC»

06/20/98

4.50

1494

2 U

2 U

172

24 NM

85.5 NMNM

4.18

2.8

18.7

1020 NMNM

0.002 U

0.148

0.03 J 22.1

0.003

95

24.8

2 U

6.3 NM

781

2 U

1670 J -

L1180S-01

HAFITMWtMMIt M 11/18/96

6.61

826

90

2 U

126

8

0.1 U

39.8

0.01 U

2.28

2.28

2.4

9.1

360

0.016)

0.005 UJ

0.001 U

0.001 J 0.01 U

0.03 J 0.000 U

0.523

0.05

90

1.6

2 J 479

2 U

640

AP1TMW15

. Alluvtnm L14243-01 ——— M-APITMWIMMU*?

06/11/97

6.61

769

87

2 U

107

10.1

0.1 U

35.2

0.01 U

2.89

2,89

1.1

8.9

300 J 0.019 J 0.005 UJ

0.002 U

0.000 U

0.01 J 0.01 U 0.000 u

0.014 J 0.01 J

87

0.8

1 U

412

2 U

620 J

L16549-04

M.AP1TMW1S-0|.|IH»7 _ 11/21/97

6.67

751

84

2 U

1AQ

12 NM

33.1 NMNM

2.99 J

1.2

8.8

320

. NM NM

0.001

0.003 U

0.01 U

0.01 U

0.001 U

0.005 U

0.02

84

2.3 U NM

409

2 U

580

L19059-10

M-AHTMW1S4MM1*

06/19/98

6.52

838

84

2 U

96.3

13 NM

31.3 NMNM

3.16

1

10.4

290 NMNM

0.002 U

0.0004 U

0.01 U

0.01 U

0.0004 U

0.011 J 0.01 J

84

-3.1 NMtff>

2 U

560

Now: U • Not detected * Ac Wlond method detenta link (MDL). I-Enhiwed. J- - EKlmmd, bhMd tow. Ul-UndettcttdltMttallwIMDL . ' , NM-NMnonml .

•" Monhorfcif «dl AMTMW3 MI nmpW In Dozmbcr 1996 mher dm Novantar 1996 dictaf Ike km flaw nan. Dm far mootwfaf «rib NWJA, NW3C»id NWJDcotkntd 11/96ad W7 woepnvMed by WESTEQ «WTdnm > Haamatn AP1PZI9,APIPZ20 ind APIPZ2I fat bnUed during Stptaabtt 1997.

A5344\9»SAMP\MFGGW.WB1 CtgeToft ] 09/23/98
Table 1 GROUNDWATER QUALITY DATA (11/96, 6/97,11/97 AND 6/98) O U7 - APACHE TAILINGS

SAMPL E LOCATION ______ HYDROGEOLOT.rr IIN1T

L AB NUMBER SAMPLE NUMBER

pH (units) Conductivity ®25C (umhos/cm) . Major Constituents and Inorganics Bicarbonate (mg/L) Carbonate (mg/L) Calcium (mg/L) Chloride (mg/L) Fluoride (mg/L) Magnesium (mg/L) Nitrite as N (mg/L) Nitrate as N (mg/L) Nitrate/Nitrite as N (mg/L) Potassium (mg/L) Sodium (mg/L) Sulfaie (mg/L ) Phosphorus, dissolved (mg/L) Phosphorus, ortho dissolved (me/L) Metals, Dissolved Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Other Water Quality Parameters Total Alkalinity as CaC03 <mg/L) Cation-Anion Balance (%) Dissolved Organic Carbon (DOQ (mg/L) Hardness as CaC03 (mg/L) • Hydroxide as CaC03 (mg/L) Residue, Filterable (TDS) (mg/L) Residue. Non-Filterable (TSS) (me/Li -

L11S4M7 M-AnTMWl«S41-IIMK 11/20/9C

6.11

5090

41

2 U

390

7

0.2 J 400

0.02 1

0.02 U

0.02 U

14

19

4280

0.035 J 0.015 J

0.01 J

0.041

0.03 U

513

0.234

265

197

41

7.7

3 J 262Q

2U .

6220

AP1TMW1CS Alluvium - L*l*U9o-fl9 M-Ar1TMWI«S-*M14»7

06/14/97

6.28

4330

26

2 U

380

2.9

0.1 U

375

0.01 U

0.03 1

0.03 J 14.7

16.6

3090

0.032

0.009 J

0.026 J 0.062

0.03 U

335

0.539

229

167

26

16

2 J 2490

2 U

5570

16 J

L105ZU-US

M-AMTMWKS-01-I12W7

11/20/97

6.40

2780

is

2 U

270

5 NM

236 NMNM

0.03

11.4

10.9

2060

0.020 NM

0.018

0.080

0.05 U

261

0.213

131

92.3

18

15.5 NM

1640

2 U

3400 NM

L190S9-13 M-AnTMWUS«MMIt 06/19/W

5.41

3460

10

2 U

255

5 NM

210 NMNM

0.11

11.1

10.7

2070 NMNM

0.016 1

0.019

0.01 U 1££

0.210

123

80.2

10

7.6 NM

1500

2 U

3090

AP1TMWKD

LI 1845-18 M-APITMW16D4I-11MK 11/20/96

6.21

3130

27

2 U

290

5

0.1 U

234

0.02 J

0.02 U

0.02 U

10

12

2130

0.021 }

0.007 J

0.011 J

0.008

0.02 U

220

0.019

122

92

27 ,

12.1

2 J 1690

2 U

3470

L1425841 M-AnTMW|CMt.«|4f7

06/14/97

6.40

2910

24

2 U

259

2.6

0.1 U

216

0.01 U

0.04 J 0.04 J

9.3

10.5

1930

0.189

0.011 J

0.014 J 0.007

0.02 U

201

0.031

111

85.1

24

12.4

21

1540

2 U

3230

——— —

 16 J

None NMSmpM

NMMM

NM NMNMNM NMNMNM NMNM NMNM NMNMNM

NM NMNMNM NMNM NM

NMNM NMNM

FtNl NM

None N ot SunpMa

6/90

NM

MM

NM NMNM NMNM NMNM NMNM NMNMNMNMNM

NMNMNMNMNM NMNM

NMNM NMNMNMNM

Mont: . U • NM detected x dtt todfcmd method tetotoo Itak (MDL). I - eahmal.

01 • Undetected « Ottawa) MDL. NM - Not mnjorrd.

•«Mo«ll«ln»»d1A?lTMW3wiMmpWhDKOTbwl»«nd»ihMN

DM far mxtHl*t vrib NW3A, NWSC at NWSDoMoed limmt tW «ere pnwUed by WESTEC:«W4«ii«i«xwHd«ed.

• AflPZIf. APIPZM rail APIPZJI «m tanlM *rt« S+*mtor 1997.

l:\5344t9SSAMP\MFGGW.WBl Piielofl3 09/13/9t
Table 1 GROUNDWATER QUALITY DATA (11/96,6/97,11/97 AND 6/98) OU7-APACHE TAILING S

HYDROGEOLOGIC UNIT L AB NUMBER

SAMPL E NUMBER SAMPL E DATE

pH (uniis) Conductivity @25C (umhos/cm)

lajor Constituents and Inorganics Bicarbonate (mg/L) Carbonate (mg/L) Calcium (mg/L) Chloride (mg/L) Fluoride (mg/L ) Magnesium (mg/L) Nitrite as N (mg/L) Nitrate as N (mg/L) Nitrate/Nitrite as N (mg/L) Potassium (mg/L) Sodium (mg/L) Sulfate (mg/L ) Phosphorus, dissolved (mg/L) Phosphorus, ortho dissolved (mg/L)

leials, Dissolved Arsenic (mg/L)

 Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Hher Water Quality Parameters Total Alkalinity as CaCO3 (mg/L) Cation-Anion Balance (%) Dissolved Organic Carbon (DOQ (mg/L) Hardness as CaC03 (mg/L) Hydroxide as CaCO3 (mg/L) Residue, Filterable (TDS) (mg/L) Residue. Non-Filterable (TSS) (mg/L)

11/96

WELL

NOT

INSTALLED

L14258-OZ M-AP1TMWI7-M-4I397

06/13/97

6.79

2020

57

2 U

358

17.2

0.1 U

78.2

0.1

3.03

3.13

3.9

44.2

1130

0.014 ]

0.007 J

0.002 U

0.001 J

0.01 U

0.13

0.003

1.31

0.02 J

57

1.7

3 1

1220

2 U

1890

22

LI6549-O1

M-AMTMWI7-01-IIZW 7 u/xzm

5.91

1965

45

2 U

353

18 NM

75.5 NM NM

3.66 U

3.5

45.8

1190 NMNM

0.001 U

0.003 U

0.01 U

0.37

0.001 U

1.55

0.03

45I .I U NM

1190

2 U

1920 NM

L1908042

M-AF1TMW1741-4M3*

06/20/98

5.86

1780

47

2 U

385

20 NM

79.2 NMNM

3.32

2.6

44.1

1210 NMNM

0.002 U

0.0004

0.01 U

0.02 J

0.0004 U

0.761

0.01 J

47

1.3 NM . 1290

2 U

2020 J - NM

11/96

WELL

NOT

INSTALLED

AP1TMWU . ____ Alluvium L14258-07

MWkPITMWIMMI W

06/13/97

6.95

1360

106

2 U

149

41

0.1 J 60.8

0.01 U

1.13

1.13

4.8

43.2

550

0.019 1

0.005 Ul

0.002 U

0.060

0.01 U

0.01 }

0.000 U

0.105

20.1

106

0.6

1 J 622

2 U

1010

184

None N ot Sniffed (Dry) ____ 11/97 ____

Mr*MM

NriMM

NP<MM

NP iMM

NMNMNM NMNMNMNMNMNMNMNMNM

NMNMNMNMNMNMNM

NMNM NMNMNMNMNM

119059-15

M-APlTMWIMMi«»

06/19/98

6.23

1735

93

2 U

171

32 NM

70.1 NMNM

1.27

5.5

61.9

730 NMNM

0.002 U

0.0798

0.01 U

0.01 U

0.0004 U

0.005 U

25.9

93

•0.6 NM

716

2 U

1190 NM

NOBH: U - NM denied « da Mfcmd metlmi 4octk» link (MDL). I-Ettimud. J.-E«lm»»d,M»edlo.. U J - Undeuotd it atinattd MDL. NM - Not motored. ' .

•« Monhortaj wed AP1TMW3 w« simpW In December 1996 inker dm November 1996 darted* low (low event. DM far monfeoriiii ««llt NW5A, NW3Cin j NWJDaitttat i 11*6and V91 werepravided by WESTEQ «V97dnm n nlldned. IAPIFZI*. APIPZM ind APIPZM wm hnlM dwtaf SepMber 1997.

>344\9>SAMP\MFGGW.WB2 Pi je 9 of 13 09/23/91
Table 1 GROUNDWATER QUALITY DATA (ll/9«, 6m, 11/97 AND 6V98) O U7 - APACHE TAILINGS

HYDROGEOLOGIC UNIT L AB NUMBER

SAMPL E NUMBER SAMPLE DATE

pH (units) Conductivity ®25C (umhos/cm) Major Constituents and Inorganics Bicarbonate (mg/L) Carbonate (mg/L) Calcium (mg/L) Chloride (mg/L) Fluoride (mg/L) Magnesium (mg/L) Nitrile as N (mg/L) Nitrate as N (mg/L) Niirate/Nitrite as N (mg/L) Potassium (mg/L) Sodium (mg/L) Sulfatc (mg/L ) Phosphorus, dissolved (mg/L) Phosphorus, ortho dissolved (mg/L) Metals, Dissolved Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Other Water Quality Parameters Total Alkalinity as CaCO3 (mg/L) Cation-Anion Balance (%) Dissolved Organic Carbon (DOC) (mg/L) Hardness as CaCO3 (mg/L) Hydroxide as CaCO3 (mg/L) Residue, Filterable (TDS) (mg/L)

AHwula^M

L11819-03 MWWIMI-lllfM

"/»/* ———— —

6.07

1850

30

2 U

336

. 1 3

0.1 U

74.4

0.01 U

1.73

1.73

2.1

41.3

1080

0.009 J 0.006 J

0.005 U

0.002 J 0.01 U

0.01 U

0.003 1

0.024 1

0.08

50

1.2

2 J

1150

2 U

1700

L14258-OS

M-NW1(414U>T

06/13/97

6.31

2050

49

2 U

363

12.7

0.1 U

83.9

0.01 U

1.94

1.94

2.3

43.4

1200

0.02S

0.011 J

0.002 U

0.000}

0.01 U

0.02 J

0.003

0.022 J

0.06

49

0.6

2 J 1250

2 U

1890

NolSMpM 11/97

NMNM

NMNMNMNMNMNMNMNM NMNMNMNMNMNM

NMNMNMNMNM NMNM

NMNMNMNMNMNM

None NMSoqM — «*»

NMNM

NMNMNMNMNMNMNMNMNMNMNMNMNMNM .

NMNM NMNMNMNMNM

NMNMNMNMNMNMNM

L11845-22

M-NW34I-IIMM lino/96

8,19

264

105

2 U

30

5

0.1 U

11.7

0.01 UJ 1.78

1.78

1.1

5.5 J

10 J 0.024 J

0.007 J

0.001 U

0.000 U

0.01 U

0.05 U

0.000 U

0.005 U

0.01 U

105

2.9

1 J 123

2 U

150

...».!._

N W3 _________ Alluvium L14258-03

M-NWM!-«!4»7

06/14/97

7.67

330

102

2 U

30

4.9O.I U

12.7

0.01 U

1.72

1.72

1.1

4.9

20 J

0.013 J

0.006 J

0.001 J

0.000 J 0.01 U

0.01 J

0.000 U

0.007 J 0.01 )

102

1.2

1 U

127

2 U

160

———— — «

None NotSmpM

NMNM

NMNM

NINIMM NMNMNMNrtnM

NMNM NMNM NMNMNM

NMNM NMNMNMNMNM

NMNMNMNMNMNM

None NMSonpM 6/98

NMNM

NM

MI NMM

Mr*MM

NMNMNMNMNMNMNMNMNMNMNM

NMNMNMNMNMNMNM

NMNMNMNMNMNMNM

. U • Hoi denied at d* Mfcnol method iJncakjo ttarit (MM). J-Enbmud. • UJ • tMewmd • atonal MDL. NM-Notm«ur«i .

• • Mootottet «td AP1TMW3 w« ampM h December I99« nther An Nomiber 19«<i«rfaf die low flow CTCTI. Dmfermtariivweft.NW3A. NWJCMdJNW5Dcoltasrf 1146Md finwo*providedbyWES7EC; tmHammntUaal.

1 APint*. AP1FZU mi APIPZ21 «tw hnlM <hrk( Stpmter 1991.

l:\J344\9SSAMP\MFGGW.WB2 Pap ID Of 13 0903m
Table! GROUNDWATER QUALITY DATA (11/96, 6/97,11/97 AND 6m) OU7-APACHE TAILING S

HYDROGEOLOG1C UNIT L AB NUMBER

SAMPL E NUMBER

SAMPLE DATE

pH (units) Conductivity @25C (umhos/cm)

4ajor Constituents and Inorganics Bicarbonate (mg/L) Carbonate (mg/L) Calcium (mg/L ) Chloride (mg/L) Fluoride (mg/L) Magnesium (mg/L) Nitrite as N (mg/L) Nitrate as N (mg/L) Nitrate/Nitrite as N (mg/L) Potassium (mg/L) Sodium (mg/L) Sulfate (mg/L ) Phosphorus, dissolved (mg/L) Phosphorus, ortho dissolved (mg/L)

totals, Dissolved Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) : . Lead (mg/L) Manganese (mg/L) Zinc (mg/L)

3ther Water Quality Parameters Total Alkalinity as CaC03 (mg/L) Cation-Anion Balance (%) Dissolved Organic Carbon (DOC) (mg/L) Hardness as CaC03 (mg/L) Hydroxide as CaCO3 (mg/L) Residue, Filterable (IDS) (mg/L)

___________ ^_ _____ Alluvium ——— • ——— ,

n /x —— —

PIEZOMETER

NOT

INSTALLED

L14243-04

M-F34R-01-ei2*7 M/12/97

4.09

5720

2 U2V

393

8.4O.I U

371

0.1 U

0.2 U

0.2 U

6

12

7380 1

0.046

0.036 ]

0.007 J

0.272

0.17 J 1120

0.648

344

233

2 U

-4.3

2 J 2510

2 U

8910

L16520-02

M-TMR-OMIMM 11/20/97

4.58

3960

2 U

2 U

402

13 NM

303 NMNM

0.02 U

6

14

3680 NMNM

0.001 U

0.290

0.05 U

542

0.202

283

174

2 U

12.6 NM

2250

2 U

5430 NM

L19059-01

M-H4R-014MII

06/18/91

3.34

5070

2 U

2 U

367

13 NM

298 NM NM

0.05 J 7 J

15

3480 NMNM

0.005 U

0.198

0.1 U

455

0.271

271

166

2 U

11.6 NM

2140

2 U

5590 NM

L1176644

L.W5A-61-K111I

11/12/96

6.64

3028

25

2 U

473

0.5 U

0.1 U

285

0.01 U

1.11

1.11

3.021

5.76

2780 NM

0.006 J

0.1 U

1.500

0.1 U

0.017 J

0.020 U

1.19

165

25

-5.7

11

2350

2 U

3530

198

NWSA — _______ Alluvium ____ 1 L14196-07

LW5A414M11

06/11/97

6.30

318

32

2 U

435

1.2

0.1 U

265

0.01 U

1.09

1.09

2.7

6.3

2180 NMNM

0.1 U

1.120

0.1 U

0.02 U

0.020 U

211

105

32

0.6 NM

2180

2 U

3500

72

L1654942

M.\VSA-0|.|1U»7

6.00

2910

30

2 U AUt 462 -

3 NM

249 NMNM

1.19 J 2.6

5.8

2180 NMNM

0.001 U

0.850

0.02 U

0.02 U

0.001 U

0.17

75.6

30

0.3 U NM

2180

2 U

3310 NM

L190SO-03

M-W5A-II14KM

06/20/98

5.82

2640

35

2 U

472

2 J . NM

259 NMNM

1.16

2.5

5.7

2130 NMNM

0.005 U

0.623

0.01 U

0.01 U

0.001 U

0.02 J

60.3

35

1.5 NM

2240

2 U

3490 J - NM

NMH: • . U . Mm detected «the bdfcrad method denetkm link (MDL).

J • Entmud. J- - Efllrawd, Macd low. UJ-Undetected MCHfaMed MDL. •

NM-Nonnewwd.

* • Monhorinf wdl APITMWJ wi. nmpled III Oecenber 1996 rather thM Novenfeer 19M dnfat, ike low flow event. Dm for n*mta>rb| wdb NWJA, NW5C md NW5D cnnecKd i l«6 nd (Hi were provided byWESTEC;<«7dttimiioinlld«ed.

i AP1PZ19. AHP2M mi APIPHI wtn httnlkd oVfat trjmni,,, 1997.

153M\98SAMP\MFGGW.WB2 Pijt I! of 13 09/13/98
Table 1 GROUNDWATER QUALITY DATA (11/96,6/97, 11/97 AND 6l9g) OU7-APACHE TAILING S

HYDROGEOLOGIC UNIT L AB NUMBER

SAMPL E NUMBER SAMPLE DATE

. pH (units) Conductivity ®25C (umhos/cm) Major Constituents and Inorganics Bicarbonate (mg/L) Carbonate (mg/L) Calcium (mg/L) Chloride (mg/L) Flaoride (mg/L) Magnesium (mg/L) Nitrite as N (mg/L) Nitrate as N (mg/L) Nitrate/Nitrite as N (mg/L) Potassium (mg/L) Sodium (mg/L) Sulfate (mg/L ) Phosphorus, dissolved (mg/L) Phosphorus, onho dissolved (mg/L) Metals, Dissolved Arsenic (mg/L) Cadmium (mg/L) • Copper (mg/L) Iron (mg/L) • Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Other Water Quality Parameters Total Alkalinity as CaCOS (mg/L) Cation-Anion Balance (%) Dissolved Organic Carbon (DOC) (mg/L) Hardness as CaCO3 (mg/L) Hydroxide as CaCOS (mg/L) Residue, Filterable (IDS) (mg/L) Residue. Non-Filterable (TSS) tas/LI

L11766-Q5 UWSC4I-MIU

11/12/96

7.61

2102

105

2 U

360

1.2 J

0.1 U

171

0.01 U

0.78

0.78

2.15 J 6.34

1340 NM

0.005 J

20 U

0.008

0.03 )

0.01 U

0.004 U

0.005 U

1.63

105

3.3

2 )

1600

2 U

2110

81

NW5C Bedrock L14241-01 UWJC-«I-»H11

06/11/97

6.88

222

105

17

335

1.7

0.1 U

155

0.01 U

0.69

0.69

1.7

6

1380 NMNM

0.02 U

0.006

0.02 U

0.02 U

0.004 U

10 U

10.8

122

-2.8 NM

1470

2 U

970

5 U

None NMSmpM 11/97

NMNM

NMMM

NM

MM

NM

NM NMNM NMNMNMNM NMNM

NM NMNMNMNMNMNM

NM NMNMNMNMNM NM

None NMSwfM 6M

NMNM

NMNM

rtnNM

NMNMNMNMNM NMNMNMNM

NMNMNMNMNMNMNM

NMNMNMNMNMNMNM

NWSD

L11766-02

UW5D-01-MIIU

11/12/96

7.50

1060

155

2 U

160

1.7 J

0.1 U

694

0.01 U

0.67

0.67

1.52 J J,vt

495 NM

0.007)

0.01 U

0.002 U

0.01 J

0.01 U

0.002 U

0.005 U

0.01 U

155

14

1 J 685

2 U

890

L14196-M

UW5M14M1I

06/11/97

7.34

119

156

2 U

156

2.6

0.1 U

682

0.01 U

0.69

0.69

1.3

5.8

510 NMNM

0.01 U

0.002 U

0.01 U

0.01 U

0.002 U

5 U

0.075

156

-1 NM

670

2 U

2110

——— — «•"

None NMSunptod

NMNM

NMNM NMNMNM NMNM NMNMNMNMNMNMNM

NMNMNMNMNM

MMNM

NM NMNM

PIIV I

NM

NM

None NotSunpfed

6/98

NMNM

NMNM NMNMNMNM NMNMNMNMNMNMNMNM

NMNMNMNMNMnmNM

NMNMNMNMMM

NM — m —— 1

U - Not **n* * d* Wfcmd naked tamta IWl (MDL>.

U) - t/MenoBl « i iiliiaml MDL. •

NM *• Not HmttfW i • • Monkoctoi wtd AP1TMW3 wu nmpfed to Dncmbcr IM mker dm Navcmber 1996 dvtog tte low flov C

AP1RI1 AFirZU in) APIR2I 199T.

l:\5344\9ISAMP\MFGCiW.WB2 P i

r

l2ofl 3
Table 1 GROUNDWATER QUALITY DATA (11/96,6/97,11/97 AND 6/98) O U7 • APACHE TAILINGS

SAMPL E LOCATION HYDROGEOLOGIC UNIT L AB NUMBER

SAMPL E NUMBER

——— — SAMPLE DATE Field Parameters

pH (units) Conductivity ®25C (umhos/cm) Major Constituents and Inorganics Bicarbonate (mg/L) Carbonate (mg/L) Calcium (mg/L) Chloride (mg/L) Fluoride (mg/L) Magnesium (mg/L) Nitrite as N (mg/L) • Nitrate as N (mg/L) Nitrate/Nitrite as N (mg/L) Potassium (mg/L) Sodium (mg/L) Sulfate (mg/L) Phosphorus, dissolved (mg/L) Phosphorus, ortho dissolved (mg/L) Metals, Dissolved Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Other Water Quality Parameters Total Alkalinity as CaCO3 (mg/L) Cation-Anlon Balance (%) Dissolved Organic Carbon (DOC) (mg/L Hardness as CaC03 (mg/L) Hydroxide as CaC03 (mg/L) Residue, Filterable (TDS) (mg/L)

AP1PZ19 AU« urn L16549-18 M-APlFZI*«t-tU3*T

11/23/97

5.39

3100

2 1 )

2 U

210

14 NM

185 NMNM

0.29 U

6

1 3 )

2770

0.030 NM

0.001

0.330

0.17

759

0.710

148

137

2 U

16.5 NM

1290

2 U

4730 NM ————— —

U9080-16 M-APIPZlMl-Mdl

04/21/98

4.75

4140

2 U

2 U

234

14 NM

189 NMNM

0.12

6 U

13 J 3140 NMNM

0.01 U

0.316

0.2 U

681

0.776

178

135

2 U

10 NM

1360

2 U

4990

AP1PZ20 Alto tun L16549-15

M-AI>lPZ2ft41.|»397

11/23/97

7.28

1830

89

2 U

348

2 NM

115 NMNM

0.05 U

3.5

7

1290 : NMNM

0.001 U

0.286

0.01 U

0.03 U

0.037

4.57

44.2

89

0 NM

1340

2 U

1940 NM

L19080-17 M.AP1PZ20414M2I

06/21/98

6.10

1810

76

2 U

280

1 J NM

91.7 NMNM

0.03 J 2.3

5.3

1020 NMNM

0.005 U

0.184

0.01 U

0.07

0.009

2.81

32.8

76

0 NM

1080

2 U

1660 NM

AP1PZ21 Alluvium L16549-11 M-AWPziwi-nurr

11/23/97

5.60

2330

2 U

2 U

162

4 NM

94.3 NMNM

0.28 U

10.4

17.8

1800 NMNM

0.001 UJ 0.057

0.02 U

501

0.021

78.1

46.7

2 U

14.4 NM

793

2 U

2930 NM

L19080-18

M-AP1PZ21.01.9M21

06/21/98

5.52

2320

2 U

2 U

110

2 J NM

79.7 NMNM

0.2

7.3

13.6

1440 NMNM

0.016 ]

0.001 U

0.05 U

422

0.001 I

53.2

37,4

2 U

14 NM

603

2 U

2480 NM

U - N« teearf «the WfcMri netted toedn Ita* (MDl).

1 - EltlTOMd. UJ-Undetected f t enlnmdMDL. NM • KM niemied.

.»- Montofinj *e« APITMW3 wtl nnpM fa December 1996mller dnn November 1996dwtaf itelow flow ero«.

Dm for montartaf wt» NWJA. NWJC at NW5D collected I Il9t nd «W WOT pravUedby WESTEC: 6W7 dm we BM yilkiittd. Plemneien AP1PZI9, APIPZU md APIPZII we bmlled tota( Scpwnber 1997.

:\5344\9ISAMP\MFGGW.WB2 Pip 13 of 13

09/13/W

Table 2 SURFACE WATER QUALITY DATA (11/96, 6/97,11/97, AND 6/98) O U7 - APACHE TAILINGS

SAMPL E LOCATION _ _________ SOURCE _____ L AB NUMBER " ————— — SAMPL E NUMBER

—— , ______ SAMPLE DATE Field Parameters ' — " ——————— Flow (cfs)

pH (units) Conductivity @25C (umhos/cm) Major Constituents and Inorganics Bicarbonate (mg/L) Carbonate (mg/L) Calcium (mg/L) Chloride (mg/L) Fluoride (mg/L ) Magnesium (mg/L) Nitrite as N (mg/L) Nitrate as N (mg/L) Nitrate/Nitrite as N (mg/L) Potassium (mg/L) Sodium (mg/L) Sulfate (mg/L ) Phosphorus, dissolved (mg/L) Phosphorus, ortho dissolved (ma/L) Metals, Dissolved Arsenic (mg/L ) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Metals, Total Arsenic (mg/L) •Cadmium (mg/L) Copper (mg/L) Iron (mg/L ) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Other Water Quality Parameters Total Alkalinity as CaC03 (mg/L) Cation-Anion Balance («) Dissolved Organic Carbon (mg/L) Hardness as CaC03 (mg/L) Hydroxide as CaC03 (mg/L) Residue. Filterable (TDS) (mg/L) Residue. Non-Filterable fTSS) (mg/L) •

U1845-05

11/22/96

0.96

7.19

1150

12

2 U

195

1.1 J

0.4 J

48.2

0.01 J

0.27

0.28

2.2

3

0

614

0.007 J

0.005 UJ

0.005 U

0.009

0.01 U

0.2

0.002 J

0.496

1.76

0.005 U

0.007

0.01 U

1.03

0.082

0.507

1.8

12

3

1 J 686

2 U

900

Apura California Gulch L14201-13

06/10/97

5.04

3.43

916

2 U

2 U

145

0.7 J

0.4 J

23.8

0.01 U

0.2

0.2

2

3

490

0.028

0.005 UJ

0.005 U

0.064

0.44

4.15

0.333

2.68

12.3 '

0.007 J

0.062

0.4

9.11

0.592

2.76

12.9

2 U

-0.7

1 U

460

2 U

850

None N ot Moallored

11/97

NMNMNM

NMNMNMNMNM NM NMNMNM NM NMNMNMNM

NM NMNMNMNMNMNM

NM NMNMNM NM NMNM

NMNM NMNMNMNM

None NMS-mplr f

1.82

6.35

1529

NMNM NMNM NM NMNMNM NM NMNM NMNM NM

NMNMNMNM NMNM NM

NM NMNM NMNM NMNM

NMNM NM NMNMNM

L11845-03

M-CCAM4M122M 11/22/96

0.93

6.28

1160

12

2 U

195

1.1 J 0.4 J

49.3

0.01 UJ

0.26

0.26

2.1

3.8

610

0.005 UJ

0.005 UJ

0.005 U

0.009

0.01 U

0.21

0.001 J

0.556

1.96

0.005 U

0.008

0.01 U

0.33

0.014

0.543

1.94

12

3.7

1 J

690

2 U

910

—— —— —— __

L1420T

M-AWMl

06/10/j

6.15

3.28

922

2 U

2 U

136

0.7 J

0.4 J 23.1

0.01 U

0.57

0.57

2.1

2.9

470 J

0.026

0.005 UJ

0.005 U

0.072

0.47

4.1

0.371

2.99

13.3

0.014 J

0.064

0.43

11.3

1.27

2.78

12.5

2 U

-1.1

1 U

435

2 U

830

AP

lUfo n

n

UP2

i la GulchL16511-10

M.APUPI-»|.111»*7

11/19/97

2.05

5.08

2200

9

2 U

644

3 NM

36.5 NM NM

0.22

3.7

5.1

1640 NM NM

0.001 U

0.006 U

0.02 U

0.08

0.001

0.14

0.52

0.005 U

0.006 U

0.02 U

0.35

0.008

0.15

0.52

9

1.1 NM

1760

2 U

2420

5 U

L19036-26

M-AFOTMI-HaT

06/17/98

1.95

5.58

1536

4 J

2 U

255

1 J NM

36.9 NM NM

0.24

2.9

4.7

770 NMNM

0.002 U

0.0048

0.01 U

0.04 J

0.0187

0.112

0.67

0.0005 U

0.004 J

0.01 U

0.04 J

0.02

0.107

0.63

4 J

-0.6 NM

789

2 U

1170S V

eft m cubic feet per second. NM - Not manned.

(0.002) - Values In parentheses Injlcate an estimated vahie. U - NM darned at the Indicated method detection llmk (MDL). J - Estimated. 1- - Estimated, biased tow. UJ * Undetected at estimated MDl.

J:\5344\98SAMP\MFGSW.WB 2 Page 1 of 15 09/23/98
Table 2 SURFACE WATER QUALITY DATA (11/96, 6/97,11/97, AND 6/98) O U7 - APACHE TAILINGS

SOURCE

SAMPLE NUMBER

SAMPLE DATE

Flow (cfs)

pH (units) Conductivity @25C (umhos/cm) Major Constituents and Inorganics Bicarbonate (mg/L) Carbonate (mg/L) Calcium (mg/L) Chloride (mg/L) Fluoride (mg/L ) Magnesium (mg/L) Nitrite as N (mg/L) Nitrate as N (mg/L) Nitrate/Nitrite as N (mg/L) Potassium (mg/L) Sodium (mg/L) Sulfate (mg/L) Phosphorus, dissolved (mg/L) . Phosphorus, ortho dissolved (mg/L) Metals, Dissolved Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Metals, Total Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Other Water Quality Parameters Total Alkalinity as CaCO3 (mg/L) Cation- A nion Balance (%) Dissolved Organic Carbon (mg/L) Hardness as CaC03 (mg/L) Hydroxide as CaC03 (mg/L) Residue, Filterable (TDS) (mg/L) Residue, Non-Filterable fTSS) (mfl/L) •

APUP1B < California Gulch

NMSuapM 06/10/97

4.83NMNMNM NMNMNMNMNMNMNMNMNMNMNMNMNMNMNMNMNM NMNMNMNMNMNM NMNMNMNMNMNMNMNMNMNMNM

NMMntan*

11191

NMNMNMNM NMNMNMNMNM NMNM NMNMNMNM NMNMNMNM NMNMNM NMNMNM NMNMNM NMNMNMNMNMNMNMNMNMNM

6/98

NMNMNMNMNMNMNMNMNMNMNMNMNMNMNMNMNMNMNMNMNMNM NMNMNM NMNMNMNMNMNMNMNMNM NMNM NMNM

APUP1A •

____________ California Guleh __________ None

 !

 ~ ' ————— — ——————— ' Ifet&miM 06/10/97

5.53 NMNMNMNMNMNMNMNMNMNMNMNMNMNMNMNMNMNMNMNMNMNMNMNMNM NMNM NMNMNMNMNMNM NMNMNM

None NMMMtora

d _____ 11/97 NMNMNMNMNMNMNMNM NM NMNMNMNM NMNMNMNMNMNM NMNMNM NMNMNMNM NMNMNMNMNMNMNMNMNMNMNM

— — — NM ————— —

None NMM«lun

d

NMNM NMNM NMNM NMNM NMNMNMNMNMNMNMNMNMNMNMNMNMNMNMNMNM NMNMNMNMNMNM

K T NMM NMNMNMNMNM

eft • cubic feet per second. NM w Not iMASurcdi

(0.002) • Vital In piieixheses indicate an ettlnuled value. U - Not detected at the inflated method detection limit (MDL). 1 - Estimated. 1- - Estimated, biased low. U J« Undetected at estimated MDL

J:\5344\98SAMP\MFGSW.WB2 Page 2 of 15

09/23/98
Table 2 SURFACE WATER QUALITY DATA (11/96, 6/97,11/97, AND 6/98) O U7 - APACHE TAILINGS

SAMPL E LOCATION _____ SOURCE L AB NUMBER

SAMPLF . NUMBER

———— — SAMPL E DATE Field Parameters ' ' —— ~ ———— — Flow (cfs )

pH (units) Conductivity @25C (umhos/cm) Major Constituent s and Inorganics Bicarbonate (mg/L) Carbonate (mg/L) Calcium (mg/L ) Chloride (mg/L ) Fluoride (mg/L ) Magnesium (mg/L) Nitriie as N (mg/L) Nitraie as N (mg/L) Nitrate/Nitrite as N (mg/L) Potassium (mg/L) Sodium (mg/L ) Sulfate (mg/L ) Phosphorus, dissolved (mg/L) Phosphorus, orlho dissolved (mg/L) Metals, Dissolved Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Metals, Total Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L ) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Other Water Quality Parameters Total Alkalinity as CaC03 (mg/L) Cation-Anion Balance (%) Dissolved Organic Carbon (mg/L) Hardness as CaC03 (mg/L) Hydroxide as CaCO3 (mg/L) Residue, Filterable (TDS) (mg/L ) Residue. Non-Filterable fTSS) (me/L-V

L11845-02

M-AFUMMlim

11/22/96

0.20

6.59

1160

12

2 U

196

1 J

0.4 J

50.1

0.01 UJ 0.26

0.26

2.3

4

604

0.009 1

0.005 UJ

0.005 U

0.009

0.01 U

0.15

0.001 U

0.57

1.91

0.005 U

0.008

0.01 U

0.24

0.009

0.551

1.9

12

4.6

1 U

696

2 U

910

5 U

Al

. Callfon L1420M2

M-AFUM14lm

06/10/97

5.72

3.33

889

2 U

2 U

139

0.8 I

0.4 J

23.9

0.01 U

0.2

0.2

2.1

3

490

0.021 J

0.005 U)

0.005 U

0.066

0.42

3.82

0.373

2.71

12.3

0.008 J 0.061

0.4

7.91

0.894

2.79

12.7

2 U

-2.3

1 U

446

2 U

840

26

' U P

liaGukh None NMMo.llon d

11/97

NM NMNM

NMNM NMNM NMNM NMNMNMNMNMNM NMNM

NMNMNM NMNMNMMM

NM NMNMNM NMNM

K I U

NMNMNMNMNMNMNM

MAMA NMMariUn d

6/98

NM NMNM

NMNM NMNM NMNM NMNM NMNMNM NM NM NM

NMNM NMNMNMNM

NMNM NMNM NM NMNM

NM NM NM NMNM NMNM

LI 1845-01

M-AFDNI4I.II12M

11/22/96

1.29

6.77

1150

11

2 U

194

1 J 0.4 J

48.9

0.01 UJ

0.25

0.25

2.2

3.9

630

0.006 J

0.005 UJ

0.005 U

0.007

0.01 U

0.12

0.001 U

0.4

1.48

0.005 U

0.006

0.01 U

0.83

0.071

0.415

1.^4

11

1.8I J

686

2 U

890

——— — L ! ———— —

APDN1

.. —————— , . California GllMl L14201-02

M-AFDW-tMIW r

5.16

3.14

897

2 U

2 U

138

0.7 J 0.4 J

23.9

0.01 U

0.2

0.2

1.9

2.9

470 J

0.019 J

0.005 UJ

0.005 U

0.066

0.45

4.5

0.278

2.74

12.6

0.005 U

0.062

0.41

6.38

0.387

2.55

11.8

2 U

•0.2

1 U

443

2 U

850

——— — 26

None NotMMlton d

11/97

NMNMNM

NMNMNM NMNMNMNMNMNM NM NMNMNM NM

NMNMNM NMNM NMNM

NMNMNMNMNM NMNM

NMNMNMNMNM NMNM

None NMMoeMon d

6/98

NMNMNM

NM NMNMNM NMNMNM NMNM NMNMNMNMU K /

NMNMNMNMNMNMNM

NM NMNM NMNMNMNM

NM NMNMNMNMNMNM

eft » cubic feet per second. NM • Not nwuuRM.

(0.002) - VihMt In pnentheies Indicate in estlnated vibe. U - Not daeaed u die IndlCMed method detection limit (MDL).

1 - Estlnated. J- » Estimated, blued low. UJ « Undetected at estimated MDL.

J:\5344\98SAMP\MFGSW.WB 2 Page 3 of 15

09/23/98
Table 2 SURFACE WATER QUALITY DATA (11/96, 6/97,11/97, AND 6/98) O U7 - APACHE TAILINGS

eft - cubic feet per second. NM » NM measured.

(0.002) - Values in paranthetes indicate an estimated value. U - Not detected n die Indicated method detection limit (MDL).

1 - Estlmain). 1- - Estimated, Mated km. UJ • Undetected at estimated MDL.

SOURCE L AB NUMBER

SAMPL E NUMBER

________ SAMPL E DATE ______

Flow (cfs )

pH (units) Conductivity @25C (umhos/cm) Major Constituents and Inorganics Bicarbonate (mg/L) Carbonate (mg/L) Calcium (mg/L) Chloride (mg/L) Fluoride (mg/L ) Magnesium (mg/L) Nitrite as N (mg/L) Nitrate as N (mg/L) Nitrate/Nitrite as N (mg/L) Potassium (mg/L) Sodium (mg/L ) Sulfate (mg/L ) Phosphorus, dissolved (mg/L) Phosphorus, ortho dissolved (mg/L) Metals, Dissolved Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L ) Iro n (mg/L ) Lead (mg/L) Manganese (mg/L ) Zinc (mg/L) Metals, Total Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Other Water Quality Parameters Total Alkalinity as CaCO3 (mg/L) Cation-Anion Balance (%) Dissolved Organic Carbon (mg/L) Hardnes s as CaC03 (mg/L) Hydroxide as CaCO3 (mg/L) Residue, Filterable (TDS) (mg/L) Residue. Non-Filterable (TSS) (me/L) •

LI 1863-03

M-SntlMI-IIIJM 11/23/96

0.01

7.51

2610

141

2 U

433

2.9

0.2 J

179

0.01 UJ

1.3

1.3

2.5

8.1

1600

0.005 UJ 0.005 UJ

0.005 U

0.293

0.02 U

0.11

0.155

1.25

51.5

0.005 U

0.29

0.02 U

0.07 J

0.168

1.17

49.2

141

2.5

1 J

1820

2 U

2460

12 J

Sprint; None NocSuqM 06/11/97

O(Dry) NM NM

NMNMNMNMNM NMNM NMNMNMNM NM NMNM

NM NMNMNMNM NM NM

NM NMNM NM NMNMNM

NMNM NMNMNM NMNM

None NMSMpM 11/19/97

(< 0.01)

6.10

2540

NMNM NMNM NM

P (M NMNM NMNMNMNMNMNM

NMNMNM NM NM NMNM

NMNM NM NM NMNMNM

NMNM NMNMNMNMNM

None N«M«*inl

6/98

O(Dry) NM NM

NM NM NMNM NMNM NMNM NM NM NMNMNM NM

NM NMNMNM • NM NM NM

NMNM NM NMNMNMNM

NMNMNM NMNM NMNM

— ————— — — — — — —— — ——— — -

L11863-10 —— — M-SnUMMllMf

11/23/96

0.03

7.40

2980

110

2 U

454

2.5

0.1 J

205

0.01 UJ

0.88

0.88

3.7

7.6

1870

0.015 J

0.005 UJ

0.01 U

0.706

0.03 J

0.16

0.281

5.58

157

0.01 U

0.704

0.02 J

0.94

0.63

4.46

134

110

4.2

2 J

1980

2 U

2930

——— — 20

L14220-01

M-SPR2MMII

06/11/97

(0.002)

6.85

2160

89

2 U

352

1.8 J

0.1 J

149

0.01 U

0.22

0.22

3.7

7.4

1450 J

0.352

0.005 UJ

0.002 J 0.401

0.02 U

0.03 J 0.27

6.12

74.6

0.01 J

0.389

0.02 J

2.6

1.11

5.69

67.3

89

1.1

2 J

1490

2 U

2110

52

SPR25

None NttSanpM 11/19/97

0.15

6.28

1727

NMNMNM NMNM NMNM NMNM NMNMNM NM NM

NMNM NMNM NM NMNM

NM NMNM NM NMNMNM

NMNMNMNMNMNMNM

L19036-12 M-snuMl-Mcn

06/17/98

(< 0.001)

6.44

1662

106

2 U

291

2 J NM

143 NMNM

0.04 J

3.8

7.5

1320 NM NM

0.002 U

0.268

0.02 U

0.5

0.166

7.62

52.8

0.1 U

0.254

0.03 J

4.4

3.95

7.14

47.5

106

-1.7 NM

1320

2 U

2100

10 J

J:\5344\98SAMP\MFGSW.WB 2 Page 4 of 15

09/23/98
Table 2 SURFACE WATER QUALITY DATA (11/96, 6/97,11/97, AND 6/98) O U7 - APACHE TAILINGS

SAMPL E LOCATION SOURCE

SAMPL E NUMBER

SAMPL E DATE

Flow (cfs)

pH (units) Conductivity @25C (umhos/cm) Major Constituent s and Inorganics Bicarbonate (mg/L) Carbonate (mg/L) Calcium (mg/L) Chloride (mg/L ) Fluoride (mg/L ) Magnesium (mg/L) Nitrite as N (mg/L) Nitrate as N (mg/L) Nitrate/Nitrite as N (mg/L) Potassium (mg/L) Sodium (mg/L ) Sulfate (mg/L ) Phosphorus, dissolved (mg/L) Phosphorus, ortho dissolved (mg/L) Metals, Dissolved Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Metals, Total Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L ) Iron (mg/L ) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Other Water Quality Parameters Total Alkalinity as CaC03 (mg/L) Cation-Anion Balance (%) Dissolved Organic Carbon (mg/L) Hardnes s as CaC03 (mg/L) Hydroxide as CaCO3 (mg/L) Residue, Filterable (TDS) (mg/L) Residue, Non-Filterable (TSS) (me/L)

L11863-06

M-SPU44I-1II3M 11/23/96

0.11

7.55 .

1731

160

2 U

242 J

1.7 J

0.2 J 102

0.01 UJ

0.23

0.23

2.4

7.4

890

0.005 UJ

0.005 UJ

0.002 U

0.115

0.01 U

0.01 U

0.0111

0.083 J 25.4

0.002 U

0.114

0.01 U

0.01 J

0.0147

0.088

22.9

160

0.7 U

1 U

1020

2 U

1450

20

SPR24 ___________ Spring ___ ____ ________________ L14220-02 M-sruni-tim 06/11/97

0.05

6.54

1420

130

2 U

213

1.1 J

0.3 J 80.2

0.01 U

0.35

0.35

2.5

6

720 J

0.012 J

0.005 UJ

0.002 U

0.0564

0.01 U

0.01 U

0.0109

0.02 J

11.6

0.005 U

0.053

0.01 U

0.08 J

0.022

0.02 J

10.9

130

0.3

1 U

862

2 U

1210

5 U

None Nw SunpW

11/19/97

(0.01)

6.30

1940

NMNM NMNMNMNMNMNMNM NMNMNM NMNM

NMNMNM NMNM NMNM

NMNMNMNMNM NMNM

NMNM NMNM NMNMNM

None N ol S.mpM 06/17/98

0.029

6.77

1668

NMNM NMNMNMNM NMNM NMNM NMNMNMNM

NMNMNMNMNMNMNM

NMNMNMNMNM NMNM

NMNMNMNM NMNM NM

SPR24B

LI1863-09

M-SPR14B4I.I1UN 11/23/96

0.03

7.97

1374

49

2 U

223 J

1.1 J 0.3 J CQ 0 jy.o

0.01 UJ

0.21

0.21

2

4.6

690

0.005 UJ

0.005 UJ

0.01 U

0.049

0.01 J

0.02 J

0.013

0.505

10.6

0.002 U

0.047

0.01 J

0.05

0.017

0.427

9.13

49

3.5

1 U

803

2 U

1110

L14220-03

M-SPR3<M14I1»7

0.02

7.06

1082

2 U

169

0.8 J 0.4 J

51.5

0.01 U

0.36

0.36

2.3

4

550

0.011 J

0.005 UJ

0.002 U

0.0326

0.01 J

0.01 U

0.0163

0.46

6.2

0.005 U

0.03

0.01 J

0.03 J

0.02

0.426

5.63

60

1.2

1 U

634

2 U

850

None NotSmiiM

0.01

6.32

2025

NMNMNMNMNMNM NMNMNMNMNMNMNM NM

NMNMNMNMNMNMNM

NMNMNMNM NMNM

KllLj NMl

NMNM NMNMNMNM

L19036-11

M-SPRMM1-X4I7

0.02

6.93

1218

52

2 U

222

1 U NM

48.1 NMNM

0.21

2.8

4.3

730 NMNM

0.002 U

0.0301

0.01 U

0.01 U

0.0152

0.255

J.U f noo

0.005 U

0.0292

0.02 J

0.25

0.051

0.279

5.14

52

•5 Q -ZtD

753

2 U

1110

cfs - cubic feet per second. NM « Not measured.

(0.002) - Values In parentheses indicate an estimated value. U - Not detected «the Indkaied method detection limit (MDL). J - Estimated. J- - Estimated, biased low. UJ - Undetected at estimated MDL.

J:V5344\98SAMP\MFGSW.WB 2 Page 5 of 15 09/23/98
Table 2 SURFACE WATER QUALITY DATA (11/96, 6/97,11/97, AND 6/98) O U7 - APACHE TAILINGS

_________ SOURCE L AB NUMBER SAMPL E NUMBER

• _____ SAMPL E DATE ______ Field Parameters " " —————— Flow (cfs)

Conductivity @25C (umhos/cm) Major Constituents and Inorganics Bicarbonate (mg/L) Carbonate (mg/L) Calcium (mg/L) Chloride (mg/L ) Fluoride (mg/L ) Magnesium (mg/L) Nitrite as N (mg/L ) Nitrate as N (mg/L) Nitrate/Nitrite as N (mg/L) Potassium (mg/L) Sodium (mg/L) Sulfate (mg/L ) Phosphorus, dissolved (mg/L) Phosphorus, ortho dissolved (mg/L) Metals, Dissolved Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L ) Lead (mg/L) Manganese (mg/L) Zin c (mg/L) Metals, Total Arsenic (mg/L) Cadmium (mg/L) I Copper (mg/L) 1 Iron (mg/L) 1 Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Other Water Quality Parameters Total Alkalinity as CaC03 (mg/L) Cation- A nion Balance (%) Dissolved Organic Carbon (mg/L) Hardness as CaC03 (mg/L) Hydroxide as CaC03 (mg/L) Residue. Filterable (TDS) (mg/L)

1

L11845-06 M-n>i-*|.iittM 11/22/96

1.65

7.52

200

1

89

2 U

24.7

0.9 J

0.1 J

11.6

0.01 UJ

0.13

0.13

0.7 J

1.3

14.9

0.005 J 0.006 J

0.005 U

0.002 J

0.01 U

0.01 U

0.001 U

0.005 U

0.02 J

0.005 U

0.001 U

0.01 U

0.01 J

0.001 U

0.005 U

0.05

89

2.9

1 J 109

2 U

110

P D1 —— Parltville Discharge L14220-07

M-FDMMIIH

06/11/97

1.11

7.03

184

68

2 U

22.2

1.1 J

0.1 U

10.5

0.01 U

0.1

0.1

0.8 J

1.1

23.6 J

0.011 J

0.006 J

0.002 U

0.0005 J

0.01 U

0.01 U

0.0004 U

0.005 U

0.09

0.005 U

0.001 J

0.01 U

0.05 U

0.001 J

0.005 U

0.1

68

3.8

1 J

99

2 U

100

1 None

1 NM SimpM 11/19/97

0.71

7.00

207

NM NMNM NMNM NM NMNM NM NM NM NMNM NM

NM NM NMNM NMNMNM

NMNM NM NMNMNMNM

NM

MM

NMNM NMNM

None NMSmfM 06/17/98

0.52

7.75

215

NM NM NM NMNM NM NM NM NM NMNM NMNM NM

NMNM NMNM NMNM NM

NM NMNM NM NMNMNM

NMNM NMNM NM NM

L11863-01

M-STRIMI-IIU

11/23/96

0.19

7.99

864

163

2 U

106

4.5

0.1 U

49.6

0.01 UJ

0.46

0.46

1.4

263

0.007 J

0.022 J

0.002 U

0.0004 U

0.01 J

0.01 U

0.0004 U

0.005 U

0.05

0.002 U

0.0004 U

0.01 U

0.01 U

0.0005 J

0.0005 J

0.09

163

3.7

1 J 469

2 U

620

L14220-06

-snuM06/11

0.06

7.86

789

149

2 U

104

3.1

0.1 U

47.6

0.01 U

0.57

0.57

1.4

4.6

280 J

0.013 J

0.005 UJ

0.002 U

0.0004 U

0.01 U

0.01 U

0.0004 U

0.005 U

0.06

0.005 U

0.001 J

0.01 U

0.05 U

0.001 J

0.005 U

0.09

149

1.9

1 J

456

2 U

580

5

eft » cubic feet per second. NM - Not measured.

(0.002) - Values hi paremheses indicate an estimated value. U - Not detected «the indicated method detection limit (MDL).

; - Estimated. J- - Estimated, biased low. UJ-Undetected at estimated MDL.

JPR23

iprinc None NMSopM 11/19/97

0.20

6.60

858

NM NMNMNMNM N M. NMNMNMNMNM NMNM NM

NM NMNMNMNM NMNM

NM NMNMNMNMNMNM

NMNMNMNMNMNMNM

L19036-23

M-SnUMl-MilT

06/17/9*

0.0073

7.53

1042

142

2 U

120

4 J NM

56.4 NMNM

0.57

1.2

5.1

380 NM NM

0.002 U

0.002 U

0.01 U

0.01 U

0.002 U

0.015 J

0.03 J

0.005 U

0.001 U

0.01 U

0.09

0.006

0.035

0.08

142

-0.5 NM

532

2 U

740

6 J

J:\3344\Q8SAMP\MFGS\V.WB 2 Page 6 of 15

09/23/98
Table 2 SURFACE WATER QUALITY DATA (11/96, 6/97,11/97, AND 6/98) O U7 . APACHE TAILINGS

.SAMPL E LOCATION SOURCE L AB NUMBER

SAMPL E NUMBER

SAMPL E DATE Field Parameters Flow (cfs)

pH (units) Conductivity @25C (umhos/cm) Major Conslituenis and Inorganics Bicarbonate (mg/L ) Carbonate (mg/L) Calcium (mg/L) Chloride (mg/L) Fluoride (mg/L ) Magnesium (mg/L) Nitrite as N (mg/L) Nitrate as N (mg/L) Nitrate/Nitrite as N (mg/L) Potassium (mg/L) Sodium (mg/L) Sulfate (mg/L ) Phosphorus, dissolved (mg/L) Phosphorus, ortho dissolved (mg/L) Metals, Dissolved Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Metals, Total Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L ) Iron (mg/L ) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Other Water Quality Parameters Total Alkalinity as CaC03 (mg/L) Cation- A nion Balance (%) Dissolved Organic Carbon (mg/L) Hardness as CaC03 (mg/L) Hydroxide as CaCO3 (mg/L) Residue, Filterable (TDS) (mg/L) Residue. Non-Filterable (TSS) (mg/L) •

L11845-07

M-SFRI14MIIIM 11/22/96

NM

6.96

336

97

2 0

42.9

1.5 J O.I U

15.6

0.01 UJ

0.5

0.5

1.7

2.1

61

0.009 J

0.005 UJ

0.005 U

0.002 J 0.01 U

0.01 U

0.001 U

0.006 J 0.03 J

0.005 U

0.001 U

0.01 U

0.09

0.003 J

0.023 J 0.13

97

3.8

1 U

171

2 U

200

12 J

SPR22 _________ Sprtoe __

L14220-08 M-snuM\4im 06/11/97

NM

6.66

547

91

2 U

72.4

2.9

0.1 U

27.2

0.01 U

0.95

0.95

4.4

3.9

181 J 0.015 J 0.005 UJ

0.002 U

0.002

0.01 U

0.01 J

0.0006 J

0.191

1.93

0.005 U

0.004 J

0.01 U

0.15

0.005

0.232

1.85

91

3.7

2 J

293

2 U

380

14 J

None NwM<»Henrf

11/97

NMNMNM

NM NMNMNMNM NM NMNM NMNMNMNM NM NM

NMNM NMNMNMNMNM

NMNMNMNMNM NMNM

NMNM NM NMNM NM NM

None NotSimpM 06/17/98

« 0.001)

7.22

340

NMNMNMNM NM NMNMNMNMNMNMNMNMNM

NMNMNMNMNMNMNM

NMNMNMNMNMNMNM

NMNMNMNM NMNMNM

CP1

L1I863-07

M-CR4M113M 11/23/96

NM

8.31

350

O?DA

2 U

40.2

1.8 J 0.1 U

16.7

0.01 UJ 0.36

0.36

3.5

2.3

64

0.009 J

0.005 UJ

0.001 U

0.0003 J

0.01 J

0.01 U

0.0002 U

0.009 J 0.07

0.002 U

0.0004 U

0.01 U

0.17

0.002

0.026 J

0.13

96

3.4

1 J 169

2 U

230

5 U

L14220-04 M-cpi-*i.<ii»7

06/11/97

NM

 7.55

439

77

2 U

56.3

1.8 J

0.1 U o20. n A4

0.01 U

0.09 J

0.09 J 4.4

2.7

14f I**)U

0.026

0.005 UJ

0.002 U

0.0004 U

0.01 U

0.1

0.0007 J

0.096

0.05

0.005 U

0.001 J

0.01 U

3.37

0.027

0.14

0.22

77

2.1

1 J

225

2 U

290

8 J

None N ot MmHorad

NMNMNM

NMNM NMNM NMNMNM NMNMNM NMNMNMNM

NMNMNMNMNMNMNM

NMNMNMNMNMNM NM

NMNM NM NMNMNMNM

None

6/98

NMNMNM

NM NMNMNMNMNMNMNM NMNMNMNMNMNM

NMNMNM NMNMNMNM

NMNMNMNMNMNMNM

NMNMNM NMNMNMNM

eft - cubic feet per second. NM * Not measured.

(0.002) » Values In parentheses Indicate an estimated value. U - Not detected at the indicated method detection limit (MDL).

) - Estimated. I- - Estimated, biased low. UJ • Undetected at estimated MDL.

.5344\98SAMP\MFGSW.WB 2 Page 7 of IS 09/23/98
Table 2 SURFACE WATER QUALITY DATA (11/96, 6/97,11/97, AND 6/98) O U7 - APACHE TAILINGS

eft - cubic feet per second. NM - Not measured.

(0.002) - Values in parentheses Indicate in estimated value. U - NM detected at the Indicated method detection Ibnft (MDL). J * Estimated. J- - Estimated, bbsed low. UJ - Undetected at estimated MOL.

SAMPLE LOCATION SOURCE L AB NUMBER

SAMPLE NUMBER SAMPLE DATE Field Parameters Row (cfs)

pH (units) Conductivity @25C (umhos/cm) Major Constituents and Inorganics Bicarbonate (mg/L ) Carbonate (mg/L) Calcium (mg/L) Chloride (mg/L) Fluoride (mg/L) Magnesium (mg/L) Nitrite as N (mg/L) Nitrate as N (mg/L) Nitrate/Nitrite as N (mg/L) Potassium (mg/L) Sodium (mg/L) Sulfate (mg/L) Phosphorus, dissolved .(mg/L) Phosphorus, ortho dissolved (mg/L) Metals, Dissolved Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Metals, Total Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Other Water Quality Parameters Total Alkalinity as CaCO3 (mg/L) Cation-Anion Balance (%) Dissolved Organic Carbon (mg/L) Hardness as CaC03 (mg/L) Hydroxide as CaC03 (mg/L) Residue. Filterable (TDS) (mg/L)

LI 1845-25

M-ATOMI-tlllM

11/21/96

1.77

6.90

550

98

2 U

67.8

1.4 J

0.1 U

28.8

0.01 UJ

0.17

0.17

1.1

2.5

170

0.021 J 0.007 J

0.005 U

0.031

0.01 U

0.01 U

0.005 J

0.199

5.07

0.005 U

0.029

0.01 U

0.17

0.017

0.213

5.4

98

4.1

1 U

288

2 U

360

APU1 Combined Surface Flows L14201-06

M-Artn4l4l(TT

06/10/97

iI.J iOs

6.95

353

79

2 U

45.6

1.4 J

0.1 U

19.2

0.01 U

0.03 J

0.03 J

0.9 J 1.7

101

0.027

0.005 UJ

0.005 U

0.014

0.01 J

0.06

0.003 J

0.217

2.14

0.005 U

0.013

0.01 U

0.25

0.02

0.204

2.08

79

3.8

1 J

193

2 U

270

5 U

H 6511-08 M-Ann-«i-iii»»7

11/19/97

1.45

6.23

493

98

2 U

69

1

MPiIVMl

23.2 NM

MruMnO.I

2 U

1.9

1£f t 16Q NM NM

0.001 U

0.013

0.01 U

0.01 U

0.003

0.128

2.57

0.001 U

0.014

0.01 U

Un. u JH

0.017

0.123

2.4

98

1.9 NM

268

2 U

300

6

L19036-24

M.APUHI.JW17

06/17/98

f t JCO 0.68

6.73

464

75

2 U

42.4

1 J NM

16.5 NM NM

0.04 J

0.8 J

1.5

no NMNM

0.002 U

0.0056

0.01 U

0.01 U

0.0022

0.049

0.89

0.005 U

0.005

0.01 U

0.15

0.027

0.05

u.o n ny o

75

-4.1 NM

174

2 U M f l iRM

6!

L11845-23

M-APDI-el-IlllK

11/21/96

2.09

7.50

560

97

2 U

69.2

1.7 J

0.1 U

26.5

0.01 UJ

0.15

0.15

0.9 J

2.6

175

0.017 J

0.005 UJ

0.001 U

0.0029

0.01 J

0.01 U

0.0048

0.21

5.03

0.002 U

0.0295

0.01 U

0.31

0.0321

0.232

5.4

97

2.3

1 U

282

2 V

370

6 J

_____Wo

L14201-03 M-AFDMI4IW 7

06/10/97

1.25

6.64

321

79

2 U

43.6

1.4 J

0.1 U

18.7

0.01 U

0.24

0.24

0.9 J

1.7

94

0.014 J

0.005 UJ

0.005 U

0.012

0.01 J

0.03 J

0.003 J 0.141

1.72

0.005 U

0.011

0.01 J

0.15

0.011

0.132

1.64

79

3.6

2 J

186

2 U

270

10 J

A o dBPD1

ox Culvert None

11/97

NM NMNM

NM NMNM NM NMNM NMNM NMNM NMNM NM NM

NMNMNM NM NM NMN M . NM NMNMNM NMNM NM

NMNMNMNMNMNMNM

None NMMoilWiW

6/98

NM NMNM

NM NMNM NM NMNM NMNM NM NMNM NMNM NM

NMNMNMNM NM NMNM

NMNM NMNM NMNM NM

NMNM NMNM NMNMNM

J:\5344\98SAMP\MFCSW.WB 2 Pages of 15

09/23W8
Table 2 SURFACE WATER QUALITY DATA (11/96, 6191,11/97, AND 6/98) O U7 - APACHE TAILINGS

SAMPL E LOCATION _________ SOURCE L AB NUMBER

SAMPL E NUMBER

________ SAMPL E DATE Field Parameters Flow (cfs)

pH (units) Conductivity @25C (umhos/cm) Major Constituents and Inorganics

i Bicarbonate (mg/L) Carbonate (mg/L) Calcium (mg/L) Chloride (mg/L ) Fluoride (mg/L) Magnesium (mg/L) Nitrite as N (mg/L) Nitrate as N (mg/L) Nitrate/Nitrite as N (mg/L) Potassium (mg/L) Sodium (mg/L) Sulfate (mg/L ) Phosphorus, dissolved (mg/L) Phosphorus, onho dissolved (mg/L) Metals, Dissolved Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) . Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Metals, Total Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Other Water Quality Parameters Total Alkalinity as CaC03 (mg/L) Cation-Anion Balance (%) Dissolved Organic Carbon (mg/L) Hardness as CaC03 (mg/L) Hydroxide as CaC03 (mg/L) Residue, Filterable (TDS) (mg/L) Residue. Non-Filterable (TSS) (me/U •

LI 1845-13

M-CGAM4MII1M

11/21/96

3.89

7.30

819

52

2 U

127

1.4 J

0.3 J

38.5

0.01 UJ

0.22

0.22

1.3

3.2

405

0.01 J 0.005 UJ

0.005 U

0.019

0.01 U

0.07

0.002 J

0.425

3.66

0.005 U

0.017

0.01 U

0.38

0.032

0.411

3.54

52

1.1

1 J

476

2 U

660

22

Califorr L14201-04

M-AFDN24MIW7

06/10/97

7.42

3.45

571

2 U

2 U

62.4

0.7 J

0.3 J

21.4

0.01 U

0.32

0.32

1.5

2.5

290 J 0.029

0.005 UJ

0.005 U

0.071

0.5

2.42

0.283

3.27

15.2

0.005 U

0.07

0.44

6.39

0.405

2.97

13.8

2 U

-2.3

2 J

244

2 U

550

28

ia GulchL16511-06

M-AFDN24MI1MT

11/19/97

3.5

5.54

1410

54

2 U

372

2 NM

30.8 NMNM

0.19

3 J

3.3

910 NMNM

0.001 U

0.009

0.01 U

0.12

0.001

0.484

2.48

0.002

0.011

0.01

1.08

0.05

0.458

2.39

54

2.9 NM

1060

2 U

1400

16 J

L19036-14

M-APDN2^|.»MU

06/16/98

3.16

6.74

1408

26

2 U

190

1 U NM

32.6 NMNM

0.16

2.4

3 D.6

540 NM NM

0.002 U

0.0101

0.01 J

0.08

0.006

0.509

2.07

0.005 U

0.01

0.01 U

0.31

0.0346

0.491

2.08

26

2.5 NM

609

2 U

840

5 U

IT — "~~ ~~ ' ——— ' ———— — — SPR9

L11863-11

M-SFRMI.I123M 11/23/96

NM

5.63

2610

5 J

2 U . 274

2.9

0.2 J

206

0.01 J

0.3

0.31

5.1

8.4

1630

0.045 J

0.012 1

0.01 U

0.034

0.04 J

43

0.027

55.4

71.5

0.005 U

0.032

0.02 J

43.2

0.074

54

69.8

5 J 7

2 J 1530

2 U

2540

18 J

None N ot SmipM

———— — ———————— —

0 (Dry) NMNM

NM NMNMNMNM NMNMNM NMNMNM NMNMNM

NMNMNMNM NMNMNM

NMNMNMNMNMNMNM

NM NMNMNMNM NM NM

None NMSunpM

11/19/97

O(Dry ) NMNM

NM NMNMNMNMNM NMNMNM NMNM NMNM NM

NMNMNM NMNMNMNM

NMNMNMNMNMNMNM

NMNMNM NMNM NMNM

L19036-18

M.S1TO-OI-9MK

06/16/98

(< 0.001)

3.15

5460

2 U

2 U

378

4 J NM

610 NM NM

0.02 U

10.7

12.5

4060 NMNM

0.01 J

0.106

1.1

209

0.103

262

>)O< £QJ

6.01 U

0.044

0.37

qe o JJ. O

0.157

179

252

2 U

12.1 NM

3450

2 U

6170

14 J

eft - cubic feet per second. NM - Not measured.

(0.002) » Values hi parentheses rndtotc an estimated value. U - Not detected n the Indicated method detection limit (MDL). I - Estimated. 1- - Enlnated, biased low, UJ • Undetected at estimated MDL.

.5344V98SAMPVMFGSW.WB 2 hie 9 of 15 09/23/98
Table 2 SURFACE WATER QUALITY DATA (11/96, 6/97,11/97, AND 6/98) O UT - APACHE TAILINGS

SAMPL E LOCATION SOURCE L AB NUMBER

SAMPL E NUMBER

SAMPL E DATE Field Parameters Flow (cfs)

pH (units) Conductivity @25C (umhos/cm) Major Constituents and Inorganics Bicarbonate (mg/L) Carbonate (mg/L) Calcium (mg/L) Chloride (mg/L) Fluoride (mg/L ) Magnesium (mg/L) Nitrite as N (mg/L) Nitrate as N (mg/L) Nitrate/Nitrite as N (mg/L) Potassium (mg/L) Sodium (mg/L) Sulfate (mg/L ) Phosphorus, dissolved (mg/L) Phosphorus, orlho dissolved (mg/L) Metals, Dissolved Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L ) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Metals, Total Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Other Water Quality Parameters Total Alkalinit y as CaC03 (mg/L) Cation-Anion Balance (%) Dissolved Organic Carbon (mg/L) Hardness as CaC03 (mg/L) Hydroxide as CaC03 (mg/L) Residue, Filterable (TDS) (mg/L) Residue. Non-Filterable (TSS) (me/L)

LI 1863-13

M-SFU14MI13M 11/23/96

NM

6.24

2350

15

2 U

194

2.5

0.1 U

162.0

0.04 J

0.02 U

0.03 J 7.1

8.5

1520

0.015 J

0.006 )

0.01 U

0.035

0.02 U

105.0

0.057

77.9

70.2

0.005 U

0.032

0.02 U

102.0

0.110

75.3

67.9

15

6.8

2 J

1150

2 U

2170

56

SPR21 Sprine L14220-11 M-snui4Mim

06/11/97

(0.001)

5.53

2680

2 U

2 U

266

2.1 J 0.1 J 221

0.01 U

0.2 U

0.2 U

8

10.5

1930

0.021 J

0.006 J

0.002 U

0.0699

0.08 J 130

0.282

106

89.2

0.02 J

0.076

0.13

130

1.09

104

87.3

2 U

9.9

2 J

1570

2 U

3100

304

None NxSmpM 11/19/97

0(Dry) NMNM

NMNM NJlIVMI NM NM NMNI NMM NMNM NMNMNMNM NM

NMNM NMNMNMNMNM

NMNMNMNMNMNMNM

NMNM NMNMNMNM — — — NM

L19036-17

M-SPMI414MU

06/16/98

« 0.001)

6.09

1880

10

2 U

167

2 J NM

114 NM NM

0.06)

5.1

6

1020 NM NM

0.005 U

0.0472

0.05

33.1

0.12

39.6

41.4

0.005 U

0.0472

0.05

33.1

0.204

38.6 4t\/tj n •;

10

5 NM

886

2 U

1630

None KMSMipM 11/11/96

0<Dry) NMNM

NMNM NM NMNM NM NMNMNMNM NM NMNMNM

NM NM NMNMNMNM NM

NMNM NMNMNMNINIMW

NP IMM

NMNMNMNMNMNM

L14220-15

M-SPIU7^Mtl»

06/11/97

0.004

4.74

4110

2 U

2 U

270

7.7

0.1 U

265

0.01 )

0.4 J 0.4 )

8 J

15

4500 J

0.028

0.014 J

0.003 J

0.516

0.16 J

648

0.584

274

162

0.02 J

0.51

0.21

608

0.756

271

165

2 U

0.4

2 J

1760

2 U

5590

SPR27 Sprine None NMSmpkd

11/97

« 0.001)

4.62

6540

NMNM NMNMNMNM NMNM NM NMNMNMNM NM

NMNM NMNMNMNM NM

NM NMNM NMNMNMNM

NMNMNMNMNMNMNM

L19036-13 M-snU7-ti.f«i«

06/16/98

(< 0.001)

4.25

9140

2 U

2 U

381

4 J NM

1230 NMNM

1.38

66.6

27.5

7190 NM NM

0.02 U

0.174

0.04 J

261

0.024

85.2

115

0.04 J

0.163

0.05 U

329

0.189

80.5

112

2 U

-1.7 NM

6010

2 U

9970

374

eft « cubic feet per second. NM • Not measured.

(0.002) - Values hi parentheses Indicate an estimated value. U - Not detected at the Indicated method detection limit (MDL).

•J - Estimated. I- - Estimated, biased tow. UJ - Undetected at estimated MOL.

J:\5344\98SAMP\MFGSW.WB 2 PjftlOofl S 09/23/98
Table 2 SURFACE WATER QUALITY DATA (11/96, 6/97,11/97, AND 6/98) O U7 - APACHE TAILINGS

SAMPL E LOCATION SOURCE L AB NUMBER SAMPL E NUMBER

_^_^ SAMPLE DATE Field Parameters Flow (cfs)

pH (units) Conductivity @25C (umhos/cm) Major Constituent-! and Inorganics Bicarbonate (mg/L) Carbonate (mg/L) Calcium (mg/L) Chloride (mg/L) Fluoride (mg/L ) Magnesium (mg/L) Nitrite as N (mg/L) Nitrate as N (mg/L) Nitrate/Nitrite as N (mg/L) Potassium (mg/L) Sodium (mg/L) Sulfate (mg/L ) Phosphorus, dissolved (mg/L) Phosphorus, ortho dissolved (mg/L) Metals, Dissolved Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Uetals, Total Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L)

3ther Water Quality Parameters Tout Alkalinity as CaCO3 (mg/L) Cation-Anion Balance (%) Dissolved Organic Carbon (mg/L) Hardness as CaC03 (mg/L) Hydroxide as CaC03 (mg/L) Residue, Filterable (TDS) (mg/L) Residue, Non-Filterable (TSS) (me/L) '

None NMSimplr f

11/11/96

0 (Dry) NMNM

NM NMNM NMNM NMNMNM NMNM NMNM NMNM

NMNMNM NMNM NMNM

NM NM NMNMNMNM NM

NMNMNMNM NMNMNM

SPR19 Sorlne L14220-12

M-SPRIMMIW

06/11/97

(0.0015)

3.27

3820

2 U

2 U

4jUJVf*

3.3O.I U

310

0.01 U

0.2 U

0.2 U

7

12.7

4740 J

0.029

0.012 J

0.002 1

0.15

0.25

352

0.649

173

123

0.01 U

0.163

0.29

309

0.705

166

121

2 U

-11.3

2 J

2180

2 U

4760

40

None NM Smipl.J

11/19/97

0(Dry) NMNM

NM NMNMNM NMNM NMNM NMNM NMNMNMNM

NMNM NMNMNMNMNM

NMNM NMNMNMNM NM

NMNMNMNM NMNMNM

H 9036-16

M-SFRIMl-NtM

06/16/98

(< 0.001)

3.66

1443

2 U

2 U | jfn

lOO

1 J NM

44.7 NMNM

0.02 U

2.1

6.8

660 NM NM

0.02 U

0.0314

0.16

4.19

1.3

9.61

8.32

0.02 U

0.0318

0.14

4.18

1.17

9.75

8.73

2 U

-2.6 NM

584

2 U

990

••^ ———

LI 1845-12

M-CGM-IM1I1M 11/21/96

2.27

7.28

826

50

2 U

131

1.4 J

0.3 J

40.3

0.01 UI

0.19

0.19

1.6

3 . 3 •

424

0.013 )

0.005 UJ

0.005 U

0.019

0.01 U

0.61

0.001 U

0.975

4.23

0.005 U

0.018

0.01 U

1

0.027

0.931

4.11

50

1.5

1 J

493

2 U

640

—— •—— —— , C<

_________ Callforr L14201-01

M-CCtMUltn

06/10/97

6.91

4.16

771

2 U

2 U

127

0.8 J 0.4 J

24.6

0.01 U

0.15

0.15

1.8

2.8

480

0.016 J

0.005 UJ

0.005 U

0.054

0.33

0.9

0.159

2.58

10.7

0.005 U

0.051

0.32

4.5

0.275

2.45

10.2

2 U

-5.3

1 1

419

2 U

740

103

ia GulchL16511-OS

M-CCU4MI1W7

11/19/97

3.52

5.33

1510

51

2 U

389

2 NM

31.5 NMNM

0.19

2

3.6

950 NMNM

0.001 U

0.006

0.01 U

0.19

0.001

0.594

2.55

0.003

0.014

0.01

1.33

0.085

0.593

2.59

51

3.2 NM

1100

2 U

1440

L19036-08

M-CG0341-MC15

06/15/98

2.97

6.48

1075

27

2 U

162I U NM

30.6 NMNM

0.15

2.1

3.3

540 NMNM

0.002 U

0.0106

0.01 U

0.18

0.0074

0.643

2.22

0.005 U

0.0103

0.01 U

0.21

0.0064

0.678

2.26

27

-4.4

MrimM

531

2 U

790

eft - cubic feet per second. NM - Not measured.

(0.002) - VihMS In parentheses Indicate an estimated value. U - Not detected «the Indicated method detection Ifmh (MDL). J-Estimated. I- - Estimated, biased tow. UJ « Undetected at estimated MDL.

5344\98SAMP\MFGSW.WB 2 Page 11 of IS 09/23/98
Table 2 SURFACE WATER QUALITY DATA (11/96, 6/97,11/97, AND 6/98) O U7 - APACHE TAILINGS

eft " cubic feet per second. NM • Not ntejsured.

(0.002) » Vihies In piremheses Indicate tn entmncd nhie. U - Not detected »the hxtattd method detection Ibnk (MDL). J » Estimated. )• - Esilimted, bbttd low. UJ » Undetected at estimated MDL.

SAMPI.F.IOCATIO N —— _________ SOURCE L AB NUMBER

SAMPI.F . NUMBER

SAMP1.R DATE Field Parameters ~ ————————— — Flow (cfs)

pH (units) Conductivity @2SC (umhos/cm) Major Constituents and Inorganics Bicarbonate (mg/L) Carbonate (mg/L) Calcium (mg/L) Chloride (mg/L) Fluoride (mg/L) Magnesium (mg/L) Nitrite as N (mg/L) Nitrate as N (mg/L) Nitrate/Niirite as N (mg/L) Potassium (mg/L) Sodium (mg/L) Sulfate (mg/L ) Phosphorus, dissolved (mg/L) Phosphorus, ortho dissolved (me/L) Metals, Dissolved Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L). Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Metals, Total Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Other Water Quality Parameters Total Alkalinit y as CaCO3 (mg/L) Cation-Anion Balance (*) Dissolved Organic Carbon (mg/L) Hardness as CaC03 (mg/L) Hydroxide as CaC03 (mg/L) Residue. Filierable (TDS) (mg/U) Residue. Non-Fllterable (TSS) (ms/U

None

11/96

NMNM NM

NMNM NM NM NMNM NM NMNM NM NMNM N M NM

NMNM NM NMNM NMNM

NMNM NM NMNM NM NM

NM NM NMNMNMNM NM

Starr Ditch L14220-14 M-soMi-nm

06/11/97

1.27

3.14

638

2 U

2 U

32.4

0.5 U

0.2 /

in ^

0.01 U

0.2 U

0.2 U

1.5

2.1

*)«£/!

0.032

0.005 UJ

0.002 U

0.145

0.38

12.9

0.108

7.59

23.4 ' 0.004 J

0.142

0.39

15.7

0.162

7.51

22.1

2 U

-0.4

2 J

166

2 U

450

24

None NxSMifM 11/97

O(Dry)

I N M NM

NM NM NMNM NMNM NM NM NM

N T M

NM

NM NM

NMNM NMNM NM NMnm

NMNMNM NMNMNMNM

NMNM NMNMNMNMNM

L19036-04

M-SDM14K1S

06/15/98

0.163

3.38

1006

2 U

2 U

63.3

3 J NM

43.4 NM NM

0.19

2

2.7

510 NMNM

0.002 U

0.328

0.65

8.53

0.307

15

51.5

0.003 J

0.308

0.61

10.7

0.329

14.5

48.8

2 U

-3.3 NM

337 I

2 U 1

790 I

14 J 1

— — None NMMMfon d _ ___ n/yo __

NM NMNM

NMNM NM NMNMNM NM NM NMNMNM NM NM ' NM

NMNM NMNM NMNM NM

NMNMNMNMNMNMNM

NM NMNMNM

NM NM

SD1A Starr Ditch None NotSMipM 06/11/97

1.23 NMNM

NMNM NM NM NM NMNM NM NMNM NM NMNMNM

NMNM NMNMNM NM NM

NM NMNM NMNMNMNM

NMNMMMMMMMMMMM

None Nft l Mwritorarf

11/97

NMNMNM

NM NM NMNM NM NMNMNMNM NMNM NMNM NM

NM NM NMNMNMNM NM

NM NMNMNM NM NMNM

NMNMNMNM NM NMNM

None NraMn *TinnJii t aimpiM

6/98

0.125

3.49

929

NMNM NM NMNM NMNMNMNM NM NM NMNMNM

NM NMNMNM NMNM NM

NM NMNMNMNMNMNM

NMNMNMNMNM . NMNM

J:\5344\98SAMP\MFGSW.WB 2 Page 12 of 15

09/23/98
Table 2 SURFACE WATER QUALITY DATA (11/96, 6/97,11/97, AND 6/98) O U7 . APACHE TAILINGS

eft - cubic feet per second. MM » Not measured.

(0.002) - Values In parentheses Indlote in esiiiraio) value.

0 - Not detected at the indicated method detection Ibnh (MDL). J - Estimated. I- - Estimated, biased low. UJ • Undetected at estimated MDL.

SAMPLE LOCATION SOURCE L AB NUMBER

SAMPLE NUMBER _ SAMPLE DATE ______

Flow (cfs)

Conductivity @25C (umhos/cm) Major Constituents and Inorganics

Carbonate (mg/L) Calcium (mg/L) Chloride (mg/L) Fluoride (mg/L)

Nitrite as N (mg/L) Nitrate as N (mg/L) Nitrate/Nitrite as N (mg/L)

Phosphorus, dissolved (mg/L) Phosphorus, ortho dissolved (mg/L) Hetals, Dissolved Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L)

Zinc (mg/L)

Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L)

Total Alkalinity as CaC03 (mg/L) Cation- A nion Balance (%) Dissolved Organic Carbon (mg/L) Hardness as CaC03 (mg/L)

. Hydroxide as CaC03 (mg/L) Residue, Filterable (IDS) (mg/L)

None NolSimpM

11/96

0 (Dry) NMNM

NM NM NMNMNMNMNM NMNMNMNMNMNMNM

NMNMNMNM NMNMNM

NMNM NMNMNMNMNM

NMNMNMNMNM NMNM

SUrr Ditch L14220-13

M-SDI-M-fll*?

06/11/97

1.52

3.35

656

2 U

2 U

33.5

0.5 U

0.2 J 21.9

0.01 U

0.2 U

0.2 U

1.5

2.1

0.032

0.005 UJ

0.002 J

0.156

0.41

15

0.139

8.23

25.5

0.006 J

0.159

0.4

17.9

0.24

23.1

2 U

1.1

2 J 174

2 U

490

None NMSmpM 11/97

0(Dry) NM NM

NMNMNMNM NMNMNMNMNMNM NMNMNMNM

NM NM • NM

NMNMNM

NMNMNMNM NMNMNM

NMNM NMNMNMNMNM

L19036-05

M-SDMMM1J

06/15/98 I1/Z3/96

L11863-02

M-SFRT4MU3M

0.086 0.05

3.64

886

2 U

2 U

62.7

3 J NM

42.2 NMNM

0.27

2.1

2.9

470 NMNM

0.002 U

0.318

0.59

7.84

0.373

14.1

45.8

0.02 U

0.305

0.57

9.46

0.442

14.1

47

2 U

-1.5 NM

330

2 U

810 J24

3.24

6360

2 U

2 U

406

11.6

0.1 U

398

0.01 UJ 0.03 J

0.03 J

5

13

7140

0.052.1

0.055 J

0.02 U

0.207

0.28 J

1190

0.776

371

247

0.01 U

0.171

0.1 U

1110

0.718

323

230

2 U

0.4

3 J 2650

2 U

8950

62

L14220-10

(0.01)

2.54

6420

2 U

2 U

395

14.3

0.1 U

381

0.01 U

0.02 U

0.02 U

5

13

7080

0.052

0.035 J

0.003 J

0.248

0.15 J

1000

0.15

341

233

0.01 J ,

0.236

0.25 J

947

0.203

327

224

2 U

-4.3

2 J

2550

2 U

8530

5

SPR7

~ ring L16511-03

M.SFR74I-11IM7

11/19/97

(0.03)

1.76

4010

2 U

2 V

328

12 NM

271 NMNM

0.02 U

6

13

3550 NMNM

0.001 U

0.27

0.05 U

465

0.141

247

152

0.001 U

0.26

0.05 U

426

0.131

230

141

2 U

7.3 NM

1930

2 U

5610

20

L19036-07

M-SF1l7-«l-Mfl5

06/15/98

0.0025

3.23

4280

2 U

2 U

304

9 NM

251 NMNM

0.06 J

6.3

13.4

3100 NMNM

0.005 U

0.192

0.09

325

0.286

238

147

0.02 J

0.187

0.14

350

0.486

232

143

2 U

7.3 NM

1790

2 U

5180 J12 J

• The location of sprint TPD b shown on Figure 1.

344\98SAMPVMFGSW.WB 2 File 13 of 15

09/23/98
Table 2 SURFACE WATER QUALITY DATA (11/96, 6/97,11/97, AND 6/98) O U7 - APACHE TAILINGS

SAMPLE LOCATION TPD* SOURCE SDI n« L AB NUMBER

SAMPLE NUMBER SAMPL E DATE Held Parameters Flow (cfs) pH (units) Conductivity @2SC (umhos/cm) Major Constituents and Inorganics Bicarbonate (mg/L) Carbonate (mg/L) Calcium (mg/L) Chloride (mg/L) Fluoride (mg/L) Magnesium (mg/L) Nitrite as N (mg/L) Nitrate as N (mg/L) Nitrate/Nitrite as N (mg/L) Potassium (mg/L) Sodium (mg/L) Sulfate (mg/L) Phosphorus, dissolved (mg/L) Phosphorus, ortho dissolved (mg/L) Metals, Dissolved Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Metals, Total Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Other Water Quality Parameters Total Alkalinity as CaCO3 (mg/L) Cation-Anion Balance (%) Dissolved Organic Carbon (mg/L) Hardness as CaC03 (mg/L) Hydroxide as CaCO3 (mg/L) Residue. Filterable (TDS) (mg/L)

L16511-4M

M-TPMM11W

11/19/97

(0.03)

3.48

30702 U 2 U

266g NM

246 NMNM

0.03

9

12

2630 NMNM

0.001

0.18

0.05 U

269

0.127

158

108

0.001

0.19

0.05 U

272

0.177

160

1092 U

6.6

NM

1680

2 U

4120 Residue Non-Filterable (TSS) (mg/L) ' 50

L19036-02

M.TFD4I-MCI5

06/15/98

« 0.001)

3.37

44602 U 2 U

3049 NM

258 NM NM

0.05 J

8.7

14.1

3240 NM NM

0.005 U

0.289

0.1

354

0.152

229

142

0.002 U

0.254

0.08 J

372

0.13

222

1342 U

6.1

NM

1820

2 U

4950 J- 5 U

CGA01U California Gnlr

h

LI 1845-11

M-CCA«IU4|.111IK

11/21/96

3.32

7.33

954182 U

137

1.5 J

0.3 J 45.9

0.01 J

0.21

0.22

1.5

3.4

516

0.011 J

0.005 UJ

0.005 U

0.02

0.01 U

16.9

0.001 U

6.17

7.74

0.005 U

0.02

0.01 U

17.1

0.053

5.76

7.4618

4.71 J

5312 U

76036

L14201-09

M-CGA«IM1-«W7

06/09/97

8.5

4.22

7532 U 2 U

113

0.7 J

0.3 J

24.8

0.01 U

0.1O.I

1.8

2.6

4001

0.027

0.005 UJ

0.005 U

0.06

0.29

6.58

0.223

4.4

12.3

0.005 U

0.055

0.26Q 7 0. /

0.365

4.04

11.4

2 U

2.71 J

3842 U

70016 J

None NofMMta

11/97

NMNM NMNMNMNMNMNM NMNMNM NMNM NM NMNMNMNMNMNMNMNM NMNM NMNMNM NMNMNMNMNM MP«MMNMNMNM Mk NMl NM

eft M cubic feet per second. NM • Not measured.

(0.002) « VrtM hi parentheses indtate in esthmed vrtie. U - Not detected it the Mlcaled method detection llmk (MDL). J - Estimated. J- - Estimated, blued low. UJ • Undetected at estimated MDL. NM NMNMNM NMNM NM NMNM NM NM NMNMNM NMNM NM NM NMNM NMNM NMNMNM NMNM NMNMNMNM NM NMNMNMNMNM

J:\5344\98SAMP\MFGSW.WB2 Pag

e U ofl 5 09/23/9

*
Table! SURFACE WATER QUALITY DATA (11/96, 6/97,11/97, AND 6/98) O U7 - APACHE TAILINGS

SAMPLE i OCATION __________ SOURCE L A B NUMBER ———————— — SAMPLE NUMBER —— . ______ SAMPL E DATE _______ Field Parameters Flow (cfs)

pH (units) Conductivity @2SC (umhos/cm) Major Constituents and Inorganics Bicarbonate (mg/L) Carbonate (mg/L) Calcium (mg/L) Chloride (mg/L) Fluoride (mg/L) Magnesium (mg/L) Nitrite as N (mg/L) Nitrate as N (mg/L) Nitrate/Nitrite as N (mg/L) Potassium (mg/L) Sodium (mg/L) Sulfate (mg/L ) Phosphorus, dissolved (mg/L) Phosphorus, orlho dissolved (mg/L) Metals, Dissolved Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Metals, Total Arsenic (mg/L) Cadmium (mg/L) Copper (mg/L) Iron (mg/L) Lead (mg/L) Manganese (mg/L) Zinc (mg/L) Other Water Quality Parameters Total Alkalinity as CaC03 (mg/L) Cation-Anion Balance (%) Dissolved Organic Carbon (mg/L) Hardness as CaC03 (mg/L) . Hydroxide as CaC03 (mg/L) Residue, Filterable (TDS) (mg/L) Residue. Non-Filterable (TSS) (me/L)

L11845-10

M-CCA01L4MI21M

11/21/96

3.32

7.02

862

34

2 U

129

1.5 J

0.2 J

43

0.01 J

0.23

0.24

1.6

3.1

437

0.015 J

0.005 UJ

0.005 U

0.024

0.01 U

12.5

0.001 U

5.25

7.79

0.005 U

0.024

0.01 J 14.4

0.105

5.07

7.89

34

7.1

1 J

499

2 U

680

CG

Callfon L1420I-11

M-CGABIHHW ?

06/09/97

« M

4.09

748

2 U

2 U

109

0.7 J

0.3 J

24.3

0.01 U

0.11

0.11

1.9

2.8

390

0.021 J

0.005 UJ

0.005 U

0.064

0.29

6.19

0.222

4.08

12.4

0.005 U

0.06

0.27

8.03

0.331

3.89

11.8

2 U

2.4

1 J

372

2 U

690

A01L

i la GulchL16S11-01

M-CGAHL4M11W7

11/19/97

.10

5.52

1390

49

2 U

322

2 NM

34.5 NM NM

0.16

2.4

3.6

890 NMNM

0.001 U

0.012

0.01 U

3.34

0.001

2.53

3.92

0.002

0.013

0.01

4.47

0.064

2.46

3.98

49

0.3 U

947

2 U

1340

L190364I

M-CGA«L41-MC1S

06/15/98

3.48

6.62

1112

15

2 U

167

1 J NM

34.6 NMNM

0.18

2.3

J .O

570 NMNM

0.002 U

0.0239

0.02 J

2.34

0.0052

3.05

4.91

0.002 U

0.0216

0.04 J

3.42

0.0766

29

4.97

15

-1.7 NM

560

2 U

850 JLI 1863-05 ——— M-SPHMl-llO *

11/23/96

0.01

3.17

1705

2 U

2 U

227 J

3

0.2 J 97.1

0.01 UJ

0.02 U

0.02 U

2.5

5.4

1350

0.005 U

0.006 J

0.005 U

0.058

0.1

56.2

0.394

60.8

46.5

0.005 U

0.056

0.07

53

0.391

52.5

42.8

2 U

0.1

2 J 967

2 U

1740

SPR8

— — — Spri,.

L14220-09 M-SPBMUlItT

06/11/97

(0.01)

2.65

1586

2 U

2 U

117

1.6 J

0.2 J

64.3

0.01 U

0.06 J

0.06 J

2.5

4.5

710

0.473

0.005 UJ

0.002 U

0.107

0.2

7.69

0.581

30.6

36.7

0.01 J

0.108

0.2

11.9

0.745

30.4

35.2

2 U

0.7

1 J 557

2 U

1150

L16511-02

M.SPRMT-111W7

11/19/97

(0.01)

1.71

1980

2 U

2 U •?fii

5 NM

106 NM NM

0.02 U

2.8

8

1390 NMNM

0.001 U

0.06

0.09

33.7

0.25

56.8

41.4

0.001 U

0.056

0.08

30.3

0.23

52

38.4

2 U

1.8

1140

2 U

2060

L19036-06

M.SPRM1.»M15

06/15/98

0.002

3.28

1970

2 U

2 U

211

5 NM

101 NM NM

0.05 J

3.4

6.9

1240 NMNM

0.01 U

0.096

0.12

15.1

0.614

 60.2

47

0.02 U

0.091

0.12 J

13.6

0.567

58.3

46.3

2 U

-0.6 NM

943

2 U

1870 Jeft " cubic feet per second. NM » Not measured.

(0.002) - Values In parentheses indicate in estimated value. U - Not detected at the indicated method detection limit (MDL). J - Estimated. J- - Estimated, biased tow. UJ * Undetected at estimated MDL.

:\53«\98SAMP\MFGSW.WB 2 Page 15 of 15 09/23/98
UNITE D STATE S ENVIRONMENTA L PROTECTIO N AGENC Y

REGIO N VII I

9 99 18th STREE T - SUITE 500

DENVER , COLORADO 80202-2466

Ref: 8EPR-SR

ACTION MEMORANDUM

CONCURRENC E COPY

DATE :

SUBJECT :

FROM:

T O:

January 26, 2000

Request for Removal (Response) Action at the California Gulch National Priorities List Site, Leadville , Colorado: ACTION MEMORANDUM for a Time- Critical Removal Action for at the Apache Tailings Impoundmen t (Operable Unit 7)

Rebecca Thomas Remedial Project Manager

M ax H. Dodson Assistant Regional Administrator Offic e of Ecosystems Protection

and Remediation

Final NPL Site ID # 29

CERCLIS ID # COD980717938

Category of Removal: Time-Critical

I . Purpose

Thi s Action Memorandum documents the Agency' s selection an d implementatio n

of the time critical removal (response) action described herein for the Apache Tailing s Impoundments , an area contaminated with metal-laden tailings from

historic mining and milling operations. The Apache Tailings Impoundmen t area

comprises a small portion of the Superfun d RI/FS Stud y Area of the California Gulch Superfun d Site, located in the Leadville mining district of Lake County, Colorado.

T he Time Critical Removal Action at the Apache Tailings Impoundment s is

consistent with the remedial activities which will be undertaken by EPA at OU 7. Final remedial alternatives for all areas of OU 7 will be evaluated in the Focused Feasibilit y Stud y (FS) and Record of Decision (ROD) for OU7. The ROD for OU 7 will ultimatel y specif y those remedial actions beyond those response actions

implemented pursuant to thi s Action Memorandum that are required.

Printed on Recycled Paper
Thi s Removal Action wil l involve the Main Tailings Impoundmen t and the North Impoundment . These are shown on Drawing No. 5344-C1 attached. The primary

goals of the response action at the Main Tailings Impoundment are to eliminate the

accumulation of water in these areas and prepare^ the tailin g under the fill

placement footprint , through consolidation and dewatering, for future excavation

activities. The primary goal of the response action at the North Impoundmen t is to

reduce infiltratio n of surface water in the area which has been identified as a source

of metals loadin g to groundwater.

Remedial action objectives were identified in the Final Screening Feasibility Study for Remediation Alternatives at the California Gulch A/PL Site, Leadville, Colorado (SFS), (ERA, 1993a). Consistent with the SFS, removal action objectives for the Apache Tailings Impoundment s are:

O Control water erosion of tailings material from the source locations

O Control leaching and migration of metals from tailings into surface

water

Q Control leaching and migration of metals from tailings into

groundwater

Removal alternatives to directly remediate surface water or ground water in the

vicinity of the Apache Tailing s Impoundment s have not been evaluated, and wil l be

addressed under Operable Uni t 12.

I I . California Gulch - Sit e Condition s an d Background

T he California Gulch Site was listed on the National Priorities List on September 8,

1983. The Site is in a minin g area covering 16 Vz square miles of a watershed that

drains along California Gulch to the Arkansas River. Startin g in 1859, the area was

mined extensively for gold, lead, silver, copper, zinc, and manganese. California Gulch collects runof f that drains numerous abandoned mines and wastes from

mining, milling and smelting. Miners buil t the Yak Tunnel to drain water from the

mine workings and to make mineral exploration and development easier. Thi s

tunnel drains hundreds of miles of mine workings in its 4-mile underground course

a nd prior to the construction of the Yak Tunnel Water Treatment Plant , discharged

approximately 210 tons of metals each year into California Gulch. Seventy-five

known mill s dumped tailings into 5-6 miles of drainages. Six impounded tailings

dumps surround the City of Leadville . Many smelters, which are located around the

Printed on Recycled Paper
city, processed silver, lead and zinc at various times. Heavy metal residues are

present in much of the City . The Arkansas River which receives water from the California Gulch, has been classified as a recreational resource, and is used

heavily for irrigation , livestock watering, public water supplie s and fisheries . Approximatel y 7,400 live in nearby Leadvill e and Lake County (See Exhibi t 1 -Site Location Map and Exhibit 2 - Operable Uni t Map)

Apache Tailing s Impoundment s

A. Background

T he Apache Tailing s Impoundment s now consist of the Main Tailings Impoundmen t an d the North Tailing s Impoundment . The smaller

impoundments , TP2 an d TP3, which were located alon g California Gulch,

approximatel y 1,500 feet downstream of the Yak Tunnel Water Treatmen t Plan t Surge Pond were removed in 1997. The material removed was taken

to the Main Tailing Impoundment . The main impoundment encompasses

approximatel y 11.3 acres and contains an estimated 630,000 cubic yards of

tailin g material. The embankment slopes on the north and east side of the

main impoundmen t range from 1.5:1 (H:V) to 1.75:1 and reach height s up to

15 feet . The embankment slope on the southwest side of the main

impoundment approaches 1:1 and is up to 50 feet in height. A field investigation was conducted in November and December 1996 to

supplemen t the existin g data presented in the Remedial Investigatio n and Feasibilit y Stud y for the site. The purpose of thi s investigatio n was to gather

data to enhance the evaluation of the interaction of surface water and

groundwater in the immediate vicinity of the Apache Tailings Impoundments . As part of thi s supplemental field investigation , 11 new groundwater

monitorin g well s were installed at the site. Two rounds of groundwater and

surface water samplin g were planned at the site as part of the supplemental

investigation ; one samplin g event was performed in November 1996 to

coincide with low-flow conditions at the site involved the samplin g of 18

groundwater wells, and surface water samplin g at 22 locations. Additional

detail s are provided in the Interim Removal Action Plan, Operable Unit 7, Cal Gulch Superfund Site, dated April 3,1997 and a letter dated March 13,1997

which transmits the monitoring data for the samplin g event described above. Both these documents are attached to the April 7, 1997 Action Memorandum.

Printed on Recycled Paper
B. Site Characterization - Apache Tailings Impoundmen t

T he results of previous investigations related to the Apache Tailings Impoundmen t are presented in various reports includin g the Tailings Disposal Area Remedial Investigation Report, California Gulch Site, Leadville, Colorado, January 1994, the Hydrogeologic Remedial Investigation Report (1995) , and the Surface Water Remedial Investigation Report (1995). In January 1996, a Draft Feasibility Study (PS) was submitted for the Apache Tailings Impoundments . Subsequent to the submittal of the draf t FS,

additional site investigation activities have been initiated to supplemen t the

previous investigation s and to support completion of the FS. T he principal concerns specificall y addressed by this Removal Action are:

• Impact s the tailings impoundment s may have on surface water and

groundwater qualit y in California Gulch; and

• Preparation of the tailings material, primaril y through consolidatio n

a nd dewatering, to facilitat e the timel y implementatio n of future, final

response actions.

B. 1 A letter report dated September 23, 1998 which summarizes surface

water and groundwater quality data from samplin g events performed

in the area of the Apache Tailings Impoundments , durin g November

a nd December 1996; Jun e 1997; November 1997 and Jun e 1998 is

attached.

C. Other Actions to Date

• A Tim e Critical Removal Action was performed by ERA on the Apache Energy and Minerals Property which is included in Operable Unit 7. T he action involved removal of drums and bags of pyrite and

decontamination and demolitio n of buildings and equipment. This Removal Action was addressed in a separate Action Memorandum

dated August 6, 1996.

• During the summer and fall of 1995, ASARCO installed approximatel y

6 horizontal drain pipe s to passively drain water from the main

impoundment . The demonstration project proved ineffective in

drainin g the tailings and was abandoned. Over the past several

years ASARCO has monitored water level s on top of the main

impoundmen t and TPs 2 and 3 and as needed, the ponded water has

been transferred to the Yak Treatment plan t to prevent catastrophic

release of the metal-laden water into California gulch.

Printed on Recycled Paper
: CALIFORNIA SUPERFUND SITE

Source: SMI/TerraMalrlx. 1996a

EXHIBIT 1

California Qulch Superfun d Site General Location Map Leadvllle, Colorado
vt&xmiTsx^—T .-

« — • «•--: : OULCH TAIUNG S IMPOUNDMENT . ____ ... *LFJ3 « "VT'MtSIFtJ l

PSJ^»'

3

^

s < '^*1

**'

!

"

!

*

a5HI!f

'''

I <B

 ' MALTA TAILING S IMPOUNDMEN T

[LOWER MALTA GULCH / • • -*5v

* s •••;<!t'ii

/?^l,., .&;.. :ff|fpi ". "•'" •.>;'•• '

; .l j

 .

Op6«We Unite and AfwwofRssponstbilitV
A Removal Action which was performed from April 21, 1997 thru August 27,1997 involved removal of Tailings Ponds # 2 and #3. The

material from the ponds was transported to and distributed on the

surface of the Main Tailing s Impoundmen t as shown on Drawing No.

5344-C2 (Copy attached). Additional information concerning this

response action is available in the Final Pollutio n Report, Jun e 30, 1998.

D. State and Local Authorities Roles

A cultural resource investigation of the Apache Tailings Area was conducted

in 1995. All of the activities involved with thi s response action involve

previously disturbed material s or material s which have been generated at OU 9 as a results of removal actions performed under the Min e Waste Pile Removal Action.

I V. Threats to Public Health or Welfare or the Environment

A Final Baseline Aquatic Ecology Risk Assessment (FBAERA), California Gulch, Leadville , Colorado (Roy F. Weston, Inc.) identifie s the Site-wide impact of mine

waste contamination on the terrestrial and aquatic ecosystems at the Site. The FBAERA provides a conceptual model of Site-wide exposure for aquatic receptors.

Thi s Time-Critical Removal Action is necessitated by the threat to publi c health, welfare and/or the environment posed by the direct contact, inhalation , and

ingestion exposure routes to hazardous substances. The response action at the Main Tailing s Impoundmen t is being performed as a preparatory step to subsequent

remedial action. The response action at the North Impoundmen t will eliminat e

pondin g of water in an area that has been identified as a source of metal s loading. T he actions will also reduce releases of metal s to the surface and groundwater.

Printed on Recycled Paper
V. Endanaerment Determination

Actual and/or threatened releases of hazardous substances from the Apache Tailing s Impoundments , if not addressed by implementin g the removal action

selected in this Action Memorandum, presents endangerment to public health, or

welfare, or the environment. The public and environment will continued to be

exposed to the release of significan t quantities of contaminated materials.

V I . Proposed Actions/Schedul e

A. Proposed Action s

1. The proposed interim actions are described in the Interim Removal Action Plan, Operable Unit 7, Apache Tailings Impoundments, California Gulch Superfund Site, dated September 9, 1999. The proposed interim actions

include the following:

MAI N TAILING S IMPOUNDMEN T

1 .1 A total of approximatel y 11,000 cubic yards of fill material will be

needed to achieve the grades required to eliminate surface water

pondin g and to accelerate the consolidation and dewatering of the

tailings material. The fil l material required wil l be generated from:

• Excavation of material placed on the Main Impoundmen t

durin g the removal of TP2 and TP3 in 1997 (approximatel y

1,000 cubic yards);

• Regrading the eastern embankment of the Main Impoundmen t

to a 3(H):1(V) slope (approximatel y 2,000 cubic yards);

Regradin g the southwest embankment in the vicinity of the

wooden box culvert, (approximatel y 1,500 cubic yards); and

• Excavation of tailin g material overlyin g the clay-tile culvert at

t he southern edge of the Main Impoundmen t (approximatel y

7,000 cubic yards).

T he tailin g excavation areas identified on the Main Impoundmen t are

considered to be consistent with activities that may be required under any

of the action alternatives considered in the OU 7 FFS.

Printed on Recycled Paper
1. TAUNB FOMU MM. X MO 3 «B

C «M9 OtMM JUY AND MMUST 1MT

•©• i iAiMmw m mna mmz (Mun mo > « r ux t AUW/MJMUOHATDU C HATDU L not wt L nor TM/TT t wtr T S MDIQVAL o

n IME mure HAICHM. flMH OM fOH PM1AN) fit MATEftM.

APACHE TAIUNQ IMPOUNDMENT S

PLACEMENT OF PRELOAD FILL AT APACHE

nil HMIC! a\M44\M«4-lM.Q«C IM»|O«B. no. 5344-C2
As part of the excavation/construction activities outlined above, a berm will

be maintained at the top of the regraded slopes to direct runof f from the top

surface of the Main Impoundmen t to the remainin g ponded area to prevent

flow from overtoppin g and eroding the regraded slopes . Positive drainage

wil l also be maintained toward the pond from the area(s) from which the TP2/TP3 material is excavated. Excavation in the area over the clay-tile

culverts will be maintained such that water will not pool and

will drain to California Gulch. Tailings that are exposed on the north side of

t he excavation over the clay tile culverts will be covered with 1 ft. minimum

of clean fil l material.

Prior to the installatio n of preload fil l placement regradin g activities , rock fil l will be placed alon g the toe of a portion of the southwest embankment of the Mai n Impoundmen t to buttress and improve the slope stabilit y in thi s area. The portion of the embankment to be buttressed is located between the

outlet of the wood box culvert and the tailing s knob which extends out into

the channel as shown on Drawing No. 5344-C2 attached.

Water presently ponded on the southern portion of the Mai n Impoundmen t

surface will be removed to facilitat e the placement of the preload fill. The

northern and southern areas of the existin g pond wil l be divided by the

construction of an interim dike at the northern edge of the fill placemen t

area. Once the divider dike has been constructed, water in the southern

portion will be pumped to the northern portion . The divider dike will be

constructed by placin g woven geotextile, as necessary for subgrade support ,

across the pond and placin g two to three feet of coarse soil material

(subgrade material s removed from TP2/TP3) over the fabric. To maintain an

equivalent storage capacity of the pond followin g fil l placement , the

intersection of the access roads to monitorin g well s MW11S/D and MW12S/D (currently the low point of the ponded area) will be raised as

necessary to achieve a minimum elevation of 10,114 feet.

During excavation and regrading activities , on-site transport , and placement

of tailin g material , appropriate engineering controls will be maintained to

control storm water runof f and dust generation. Silt fence, or other

temporary sediment control devices, will be installed at the base of the

impoundmen t embankments to be regraded to intercept and retain sediment

in storm water runoff . While dust control wil l not likel y be required in the

excavation and fill placement areas, dust control on the haul route will be

maintained through water application , as necessary.

Several settlement plates will be installed in the fill placemen t area to

monitor settlement/consolidatio n of the underlyin g tailings as a result of the

loadin g from the fill .

Printed on Recycled Paper
NORT H IMPOUNDMEN T

Construction activities to be performed on the North Impoundmen t would

involve fill placement over the area indicated on Drawing No. 5344-C1

attached. It is estimated that approximatel y 4,000 cubic yards of fill material would be required to prevent the accumulation of surface water in thi s area. T he majority of the fill material (approximatel y 3,000 cubic yards would be

mine waste material from pile s currently being removed under the OU 9 Min e Waste Pile Removal Action. The upper 1 foot of the fill material would

consist of clean fill hauled from the off site source identified in the OU9 Min e Waste Pile Removal Action Work Plan . OU 9 Min e Waste Material has been

selected for use as fill because of the non acid generating potential and

material characteristics which should result in a lower permeabilit y material

d ue to the finer grain size characteristics compared to the clean borrow fill. T he final regraded surface would be sloped to the south.

B. Applicabl e or Relevant and Appropriat e Requirements (ARARs)

T he ARARs listed on TABLE F.1 AND F.2 wil l be followed to the extent

practicable. Copies of these Table s are attached.

C. Performance Standards

1. The designed and constructed response action includes provisions to ensure

that there are no visible emissions (dust) durin g removal activities at the Apache Tailing s Impoundments . Dust control on the haul route, and other

areas, wil l be maintained through water application , as necessary.

2. Durin g the excavation, on-site transport, and placement of tailings material ,

appropriate engineering controls will be maintained to control storm water

runof f and dust generation, sil t fences, hay bales and/or other sediment

control devices will be used to intercept and retain sediment in storm water

runoff . The sediment control structures will be left in place, as necessary

followin g the completion of excavation. Un-contaminated surface water will

be diverted away from the tailings to minimize contact with tailings .

Printed on Recycled Paper
REVSCNS

ay I oat I ""•

C*A

OU. oa

ASARCO

IMPOUNDMENT S SIT E M AP

H TC gPTOBEB IMS |o»q HO. 5344-C1
3. A long-term maintenance program may be implemented if required by the Final Record of Decision for Operable Uni t 7 (OU 7) to ensure the long-term

effectivenes s of the response action.

D. Project Schedule

T he response action was completed in October 1999.

E. Estimated Costs

This response action is being conducted by ASARCO, Inc.

VII. Expected Change in the Situatio n Should Action Be Delayed or N ot Taken

If this Time-Critical removal action is delayed, or not taken, exposure of the public

and environment to heavy metals contained in the mine waste located in the Apache Tailing s Impoundment s wil l continue. Without thi s time-critical response,

release of contaminated tailings into California Gulch and the Arkansas River will

continue to contaminate surface water and groundwater in the area around the Apache Tailings Impoundments .

VIII . Outstandin g Polic y Issues

A Record of Decision wil l be issued selecting the final remedial action for Operable Uni t 7 (OU 7) of thi s Site .

I X . Enforcement

Thi s Time-Critical Removal Action wil l be performed by ASARCO, Inc.

Printed on Recycled Paper
X .. Recommendation

Thi s decision document represents the selected Time-Critical removal action for the Apache Tailing s Impoundment s portion of OU 7 of the California Gulch Superfun d Site, in the City of Leadville , County of Lake, State of Colorado. It was developed

in accordance with CERCLA, as amended, and is not inconsistent with the NCR. This decision is based on the Administrative Record for the Site .

Condition s at the Apache Tailing s Impoundment s meet the NCR Sectio n

300.415(b)(2) criteria for a removal and I recommend approval of the removal

action.

APPROVA L

M ax H. Dodson Assistan t Regional Administrator Office of Ecosystems Protection

and Remediation

DISAPPROVA L

M ax H. Dodson Assistan t Regional Administrator Office of Ecosystems Protection

and Remediation

^x? Printed on Recycled Paper

10
providin g environmental 49OO Pearl East Circle Suite 3OOW consulting and Boulder. Colorado 8O3O1

engineering services 3O3/447-1823

Fax: 447-1836

rvlcCulle y Frick & Oilman, me.

September 23, 1998 M FC Project No. 5344.2

M s. Austin N. Buckingham Colorado Department of Public Health and Environment Hazardous Materials and Waste Management Division

4300 Cherry Creek Drive South Denver, CO 80246-1530

R E: TRANSMITTAL OF JUNE 1998 MONITORING DATA OPERABLE UNIT l (OU7) - APACHE TAILINGS CALIFORNIA GULCH SUPERFUND SITE , LEADVILLE , COLORAD O

Dear Austin :

McCulley , Frick & Oilman, Inc. (MFG) is pleased to provide three copies of tables summarizing

field parameter measurements and validated surface water and groundwater quality data from the November

1996, Jun e 1997, November 1997 and June 1998 monitoring events at the Apache Tailings area. The

attached surface water quality data table includes information for station TPD, a spring where groundwater

discharges to the surface in the vicinity of the southwestern corner of former Tailings Pond No.3. Also

enclosed is a table which summarizes monthly water level measurements made in monitoring well s and

piezometers within and near the Apache Tailings Impoundmen t since November 1996. If you have any

questions, please do not hesitate to call .

Sincerely, MCCULLEY, FRICK & GILMAN, INC.

t

/2^__ >. £^<-

Bence V. Close, P.E. Associate Engineer/Geohydrologist GSD/BVC/sjb

attachment

cc: Russ Alien , CDPHE Tom Hesemann. RMC Robert Litle, Asarco Paul Rosasco, EMSI Gary Slifka, Asarco Rebecca Thomas, EPA Sherm Worthington , SMI

J:\5344\COMM\ABUCKI3.LT R

Albuquerque. NM • Austin . TX • Boston. MA • Boulder. CO • Missoula. MT • Port Lavaca. TX • San Francisco, CA • Seattle. WA • Wallace. ID S