via facsimile and first class mail chevron mining inc

0 '̂' _ ^% UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

T i

- ^^Siswv. m REGIONS I ^^^Z. " ^^^^ ^ ^ ^ ^ AVENUE, SUITE 1200 V * * ' * * ^ ? DALLAS.TX 75202-2733

9124937 via Facsimile and First Class Mail

Anne Wagner, Ph.D. Manager, Environmental & Public Policy Chevron Mining Inc. - Questa Mine P.O. Box 469 Questa, New Mexico 87556

Re: Request for Inclusion of Documents in Proposed Plan Administrative Record Administrative Record on Consent - CERCLA Docket No. 6-09-01

Dear Ms. Wagner:

The EPA has reviewed Chevron Mining Inc. - Questa Mine's (CMI's) February 24, 2010 letter and attached Table 1 requesting the inclusion of sixty-two (62) documents to the EPA's Administrative Record for the Proposed Plan. After considering CMI's request, EPA has decided not to reopen the Proposed Plan Administrative Record to include the listed documents. The basis for such decision is provided in the attached table and summarized as follows:

• Ofthe 62 documents identified by Chevron, several were already found to be part ofthe Administrative Record.

• Several others were not included because they were not used in forming the basis of EPA's preference for remedial action. Several of these documents were Molycorp, Inc. or Chevron Mining Inc. response to EPA comments on draft RI/FS documents. Most draft RI/FS documents were not included in the Administrative Record, as well as the responses to EPA comments on those draft documents.̂ The approved fmal RI/FS documents and the EPA comments requiring revision to complete such documents form the basis for EPA's preference for remedial action and are part of the Administrative Record.

It is noted that most draft fmal documents submitted to stakeholders fof review and comment are included, as well as draft documents on risk assessment. EPA has included draft EPA documents on risk assessment because ofthe role Chevron Mining Inc. and its consultants had in participating in the Technical Coordination Group process outlined in the AOC and the Statement of Work attached thereto.

Internet Address (URL) • http:/Awvw.epa.gov Recycled/Recyclable • Printed with Vegetable Oil Based Inks on Recycled Paper (Minimum 25% Postconsumer)

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• Other documents were not included because EPA did not actually have a copy and,, therefore, the documents could hot be used in forming the basis for EPA's preference. Some of these are historic documents that were apparently not obtained by EPA or just misplaced. Others prepared by Molycorp, Inc. pursuant to state permitting requirements for reclamation were never provided to EPA, In 2003 and 2004, copies of such documents were not being distributed to EPA and its oversight contractor on a consistent basis, resulting in a written request to the New Mexico ^ Energy, Minerals, and Natural Resources Department's Mining and Minerals Division (MMD) for documents in 2004. The EPA letter requesting such documents is part of the Administrative Record.

• One document listed by CMI was actually prepared after EPA closed the Administrative Record for the Proposed Plan.^Therefore, it cannot be used in forming the basis for the preferred remedy.

Although EPA has elected not to reopen the Administrative Record for the Proposed Plan to include these documents, CMI has submitted them during the public comment period and, therefore, they will be added to the final Administrative Record file for the Record of Decision (ROD), as will Chevron's February 24, 2010 transmittal letter. As part ofthe ROD Administrative Record, they will help form the basis for final decision-making by EPA.

If you have any questions regarding this matter please contact Mark Purcell with EPA at 214.665.6707 or via e-mail at purcell.mark(a>epa.gov

Sincerely

Mark D. Purcell Remedial Project Manager Superfiind Division U.S. Envirormiental Protection Agency - Region 6

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March 22, 2010

TABLE 1

LIST OF DOCUMENTS IDENTIFIED BY CHEVRON MINING INC. AND EVALUATED BY EPA FOR INCLUSION TO THE ADMINISTRATIVE

RECORD FOR THE PROPOSED PLAN

Date Title EPA Evaluation 1

MineSite

11-2003

11-2003

08-11-2004

12-23-2005

02-04-2009

02-04-2009

03-2009

07-14-2009

Goathill North Slide Investigation, Evaluation and Mitigation Report, November 2003, Volume II - Appendices A to G, Norwest Corporation, URS Corporation, Molycorp Goathill North Slide Investigation, Evaluation and Mitigation Report, November 2003, Volume III - Appendices H to J, Norwest Corporation, URS Corporation, Molycorp Goathill North Final Mitigation Design Report - Part 1, August 2004, including Appendix A - G , Norwest Corporation, URS Corporation, Molycorp

Questa Roadside Rockpiles: 2005 Operational Geotechnical Stability Evaluation, Final Report, December 23, 2005, Appendices A - J, Norwest Corporation, Molycorp

Transmittal letter to New Mexico Environment Department (NMED) and Energy, Minerals and Natural Resources Department (EMNRD) Mining and Minerals Division (MMD) from Chevron Mining Inc. Re: Goathill Reclamafion Plan to Mary Ann Menetrey and Charles Thomas from Anne Wager Goathill North Reclamation Plan; prepared by URS for Chevron Mining Inc., Questa, New Mexico, February 4, 2009

2008 Test Plot Tree Survival Monitoring Report; prepared by Buchanan Consultants, Ltd. For Chevron Mining Inc, March 2009

2007 Annual Report on the Storage Cover Lysimeter Study, . Questa Mine, New Mexico; including Appendices A - G ; prepared by Golder Associates Inc. on behalf of Chevron

EPA did not receive a copy of these documents. The Goathill North SHde Investigation, Evaluation arid Mitigation Report -Volume I (Main Report), along with the Goathill North Slide Mitigation As-Built Stability Evaluation Report, dated 2006 (DocID: 9113624), are part of the Administrative Record. Document was not used 1 in forming basis of EPA's preference for remedial action. See evaluation of Goathill North Reclamation Plan, below.

Document was not used in foiiiiing basis of -EPA's preference for remedial action; Plan was disapproved by NMED/MMD.

1 Document was not used in forming basis of EPA's preference for remedial action. Document is part of the Administrative Record (DocID: 9115221)

List of documents identified by Chevron and evaluated by EPA for inclusion to the Administrative Record for the Proposed Plan.

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Mining Inc. 07-20-2009 2008 Annual Report on the Storage Cover Lysimeter Study,

Questa Mine,.New Mexico; including Appendices A - G; prepared by Golder Associates Inc. on behalf of Chevron Mining Inc. .

Document is part ofthe Administrative Record (Doc ID: 9115222)

Permits

12-30-1998 Permit No. TAOOIRE Questa Mine and Mill Existing Mining Operations, MMD - EMNRD

Permit Revision 96-2 TAOOIRE (May 24, 2002) and Permit Revision 96-1 TAOOIRE are part of the Administrafive Record, as well as Permit Modificafions 06-1 and 05-1. The more recent revisions and modifications to original permit were deemed sufficient in helping form the basis of EPA's preference for remedial action.

09-03-2009 Transmittal and Response to Request for Additional Information, DP-1055 and DP-1734, Chevron Mining Inc. August 4, 2009; prepared for Chevron Mining Inc., Questa, New Mexico, September 3, 2009. Includes: Sept. 07 - May 09 Goathill Gulch Seep Flow Data; Attachment 19-2 Technical Memorandum Hydrogeologic Evaluation of the Goathill North Rock Pile, SRK, July 2004; and Attachment 19-3 Hydogeologic Characerization of the Caving Induced Subsidence Areas, SRK, July 2007.

EPA did not have a copy of this document and its attachments. Therefore, it was not used in forming basis of EPA's preference fof remedial action.

09-22-2009 Response to Additional Information Requested on Golder Models E-mail Request, dated September 22, 2009. Includes: Appendix D Areas, Areas Version 2, Delineations, JEO, and Modeling Results Summary Table

The Modeling Results Summary Table was used in forming basis of EPA's preference for remedial action and, therefore, is part of the Administrative Record (Doc ID: 9115498).

Abatement Memo

10-13-2008 Evaluation of Background Concentrations and Proposal of Abatement Standards for the Chevron Mining Inc. Questa Mine, Questa, New Mexico; Memorandum to Anne Wagner

The information contained in the Memorandum is part of


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and Jay Gear from Arcadis the iFinal RI Report (background concentrations for Red River Alluvial Aquifer) as well as the key section of the USGS Summary Report (Report No. 25; colluvial and bedrock background concentrations), which is included as an appendix to the Final RI Report. The Final RI Report is part of the Administrative Record

CMI Response to Agency Comments

07-11-2002 Response to EPA Comment Letter Received by Molycorp, Inc. on June 18, 2002, on Remedial Investigation/Feasibility Study Work Plan, Questa, New Mexico, March 26, 2002

In general, Molycorp, Inc. or Chevron Mining Inc.responses to comments on draft RI/FS documents were not used in forming the basis of EPA's preference for remedial action. The final approved RI/FS docurrients (for which EPA comments required revision to complete) formed the basis for EPA's preference.

Nonetheless, the responses provided by Molycorp on July 11, 2002 to comments on the RI/FS Work Plan are part ofthe Administrative Record as they are included in an evaluation for compliance by EPA's contractor, CDM Federal Programs (see Doc ID: 874982)

11-10-2008 Response to EPA and NMED Conmients dated August 19, 2008 on the Draft Molycorp Remedial Investigation Report,

This document was not used to help form the


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11-19-2008

05-28-2009

05-28-2009

06-09-2009

08-28-2009

Revision 0, Questa, New Mexico, June 21, 2007

Root Zone Evaluation Summary Report, Questa Mine, Questa, NM; prepared for Chevron Mining Inc. and submitted to NMED Response to EPA and NMED Comments Dated February 3, 2009 on the Chevron Mining Inc. Draft Feasibility Study, Revision 0, August 12, 2008 Attachments to Response to EPA and NMED Comments Dated February 3,2009 on the Chevron Mining Inc. Draft Feasibility Study, Revision 0, August 12, 2008

Response to EPA Comments on the Chevron Mining Inc. Draft Final Remedial Investigation Report, dated November 10, 2008; Administrative Order on Consent for RI/FS (CERCLA Docket 06-09-1) Response to EPA Comments on the Chevron Mining Inc. Draft Final Feasibility Study Report, dated May 28,2009

basis of EPA's preference for remedial action. This document is part of the Administrative Record (Doc ID: 873843) These documents were not used to help form the basis of EPA's preference for remedial action. See also evaluation on 07-11-2002 response to comments, above. This document is part of the Administrative Record (Doc ID: 878747)

This document was not used to help form the basis of EPA's preference for remedial action. See also evaluation on 07-11-2002 response to comments, above.

Weathering Study

03-06-2009 Publications of the Questa Rock Pile Weathering and Stability Project, Questa, NM as posted on the FTP Site of Professor Edward TrujiUo, University of Utah on January 19, 2009. Includes table of contents and subfolders for: Abstracts, Papers, Posters, and Thesis.

This document was not used by EPA in forming the basis for its preference for remedial action.

Tailing Facility

04-1996

11-04-1997

08-31-2004

Questa Tailings Disposal Facility Assessment of Acid Generating Potential; prepared by SRK and RGC for Molycorp, Inc., SRK Report No. 09208.04

Questa Tailings Disposal Facility Geochemical Testing, Final Report, prepared by SRK and RGC for Molycorp, Inc., SRK Report No. 09211/2; includes Appendices A - F

Reclamation of the Questa Tailings Facility; prepared by MFG, Inc and Buchanan Consultants for Molycorp, Inc.

This document was not used by EPA in forming the basis for its preference for remedial action. This document was not used by EPA in forming the basis for its preference for remedial action. This document is part of the Administrative


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Record (Doc ID: 9103709)

03-2005 Questa Tailings Facility Reclamation Vegetation Sampling Report; prepared by Buchanan Consiiltants for Molycorp, Inc.

This document was not used by EPA in forming the basis for its preference for remedial action.

04-2007 Questa Tailing Facility Interim Reclamation Plant Community Sampling Report; prepared by Buchanan Consultants for Molycorp, Inc.

This document (2006 Interim Report) was not used by EPA in forming the basis for its preference for remedial action. The subsequent 2007 and 2008 Interim Reports of the same title, dated April 2008 and April 2009, were used by EPA and are part of the Administrative Record (Doc IDs: 874279 and 874334).

04-2008 2007 Vegetation Monitoring Report, prepared by Buchanan Consultants for Molycorp, Inc., dated April 2008. Includes Appendices A - C, Mine Site Test Plot Construction and ~ Treatments; 2007 Tree Survival Test Plot Erosion Report; Test Plot Planting Results.

This document is part of the Administrative Record (Doc ID: 874272). .

05-31-2007 Molycorp, Inc. submittal of documents requested in the March 20, 2007 MMD letter: Status of permit submittal dates -Questa Mine and Mill, and Tailings sites; Response to Molycorp letter dated January 22,2007 and issues identified at the January 18,2007 meeting; Pennit TAOOIRE 96-1. Cover letter from Jeff Sanders, Molycorp Inc., to Steve Lucero, MMD-EMNRD. Documents include: • Revised Questa Tailings Facility Revegetation Test Plot

Program Work Plan, prepared by Buchanan Consultants, May 31, 2007;

• Schedule for the Questa Tailing Facility Surface Erosion and Stabihty Study;

• Questa Tailing Facility (Unit 3) and Pipeline (Unit 2) Seed Mix (seed mixtures and planting rates);

• Questa Tailing Facility Interim Fertilizer and Organic Amendment Application Rates, prepared by Buchanan Consultants, May 31,2007;

• Borrow Materials Investigation Summary Sheet, Tailing Facility, Questa, NM, May 31,2007;

• Molycorp Mine Site Erosion Monitoring Method,

EPA did not receive a copy of these documents. Therefore, they were not used in forming the basis for EPA's preference for remedial action.


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07-27-2009

02-24-2010

prepared by Buchanan Consultants, May 31,2007 Monitoring Report for the Storage Cover Lysimeter Study, 2008, Questa Tailing Facility, New Mexico, including Appendices A - D, prepared by Golder Associates Inc. for Chevron Mining Inc.

Report on Tailing Bioaccessibility Study Results, Questa Mine, NM; prepared by URS and McDaniel Lambert, Inc. for Chevron Mining Inc.

This document is part of the Administrative Record (Doc ID: 9114345).

The date df this document is after the Administrative Record for the Proposed Plan was completed and the Proposed Plan issued. It will not be added to the Proposed Plan Administrative Record

Durations/Timeline

09-11-2008 Major Remedial Components Schedule, prepared by URS Corporation

Although this document was requested by EPA, it was not used in helping form the basis of EPA's preference for remedial action.

Other Federal/State Documents

07-2007

07-19-2006

02-04-2009

04-06-2009

State of New Mexico, Water Quality Control Commission; In the Matter of: Appeal of Supplemental Discharge, Peimit for Closure (DP-134) for Phelps Dodge Tyrone, Inc., Docket No. WQCC 03-12(A); Docket No. WQCC 03-13(A); (Consolidated) Court of Appeals of New Mexico; Phelps Dodge Tyrone, Inc., Plaintiff-Appellant v. New Mexico Water Quality Control Commission and New Mexico Environment Department, Defendants-Appellees, No. 25,027 State of New Mexico, Water Qualiity Control Ccommission; In the Matter of: Appeal of Supplemental Discharge Permit for Closure (DP-134) for Phelps Dodge Tyrone, Inc., Docket ^^o. WQCC 03-12(A); Docket No. WQCC 03-13(A); (Consolidated); Order Denying NMF.D's and GRIP'S Respective Motions In the Court of Appeals for the State of New Mexico; Phelps Dodge Tyrone, Inc., Appellant v. New Mexico Water Quality Control Commission, Appellee; Docketing Statement of Phelps Dodge Tyrone, Inc., Appeal from New Mexico Water Quality Control Commission WQCC No. 03-12(A) and 03-13(A) (Consolidated), Ct. App. No. 29321, filed April 6, 2009

EPA did not use these documents in helping form the basis of its preference for remedial action. Therefore, they will not be included in the Administrative Record.


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04-22-2009 In the Court of Appeals for the State of New Mexico; Watermatters, LLC, Appellant v. New Mexico Water Quality Control Commission, Appellee; Docketing Statement'of Watermatters, LLC, Appeal from New Mexico Water Quality Control Commission WQCC No. 03-12(A) and 03-13(A) (Connsolidated), Ct. App. No. 29321, filed April 22, 2009

USGS Reports

2001

2002

2003

2003

2003

2004

2004

2004

Lucius, I.E., Bisdort, R.J., and Abraham, J. (2001): Results of Electrical Surveys near Red River, New Mexico: U.S. Geological Survey Opeii-File Report 01-331 Livo, K.E. and Clark, R.N. (2002): Mapped Minerals at Questa, New Mexico, Using Airbome Visible-Infrared Imaging Spectrometer (AVIRIS) Data - Preliminary Report: U.S. Geological Survey Open-File Report 02-0026 Briggs, P.H. Sutley, S.J., and Livo, K.E. (2003) Questa Baseline and Pre-Mining Ground-Water Quality Investigations. 11. Geochemistry of Composited Material from Alteration Scars and Mine-waste Piles: U.S. Geological Survey Open-File Report 03-458 ^ ' , Caine, J.S. (2003) Questa Baseline and Pre-Mining Ground-Water Quality Investigation. 6. Preliminary Brittle Structural Geological Data, Questa Mining District, southem Sangre de Cristo Mountains, New Mexico: U.S. Geological Survey Open File Report 03-280 ' McCleskey, R.B., Nordstrom, D.K., Steiger, J.I., Kimball, B.A., and Verplanck, P.L. (2003) Questa Baseline and Pre-Mining Ground-Water Quality Investigation. 2. Low-Flow (2001) and Snowmelt (2002) Snyoptic/Tracer Water Chemistry for the Red River, New Mexico: U.S. Geological Survey Open File Report 03-148 Lovetere, SH. Nordstrom, D.K., Maest, A.S., and Naus, CA. (2004) Questa Baseline and Pre-Mining Ground-Water Quahty Investigation. 3. Historical Ground-Water Quahty for the Red River Valley, New Mexico: U.S. Geological Survey Water-Resources Investigations Report 03-4186 •• Ludington, S., Plumlee, G.S., Caine, J.S., Bove, D., Holloway, J.M., and Livo, K.E. (2004) Questa Baseline and Pre-Mining Ground-Water Quality Investigation. 10. Geologic Influences on Ground and Surface Waters in the Red River Watershed, New Mexico: U.S. Geological Survey Scientific Investigations Report 2004-5245 _ _ _ _ _ ^ ^ Maest, A.S., Nordstrom, D.K., and Lovetere, S.H. (2004) Questa Baseline and Pre-Mining Ground-Water Quality Investigation. 4. Historical Surface-Water Quality for the Red River Valley, New Mexico: U.S. Geological Survey Scientific

The key section of the USGS summary report for the Questa Baseline and Pre-Mining Ground-Water Quality Investigation (Report No. 25) is included as an appendix in the Final RI Report. The Final RI Report is part of the Administrative Record.

The individual USGS reports were not used in forming the basis for EPA's preference for remedial action.

List of documents identified by Chevron and evaluated by EPA for inclusion to the Administrative Record for the Proposed Plan. • .

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2004

2004

2005

2005

2005

2005

2006

Investigations Report 2004-5063 McCleskey, R.B., Nordstrom, D.K., and Naus, CA. (2004) Questa Baseline and Pre-Mining Ground-Water Quality Investigation. 16. Quality Assurance and Quality Control for Water Analyses: U.S. Geological Survey Open-File Report 2004-1341 Powers, M.H., and Burton, B.L. (2004) Questa Baseline and Pre-Mining Ground-Water Quality Investigation. 1. Depth to Bedrock Determinations Using Shallow Seismic Data Acquired in the Straight Creek Drainage New Red River, New Mexico: U.S. Geological Survey Open-File Report 2004-1236 Ball, J.W., Runkel, R.L., and Nordstrom, D.K. (2005) Questa Baseline and Pre-Mining Ground-Water Quality Investigation. 12. Geochemical and Reactive-Transport Modeling Based on Low-How and Snowmelt Tracer Studies for the Red River, New Mexico: U.S. Geological Survey Scientific Investigations Report 2005-5149 Naus, C.A., McCleskey, R.B., Nordstrom, D.K., Donohoe, L.C, Hunt, A.G., Paillet, F., Morin, R.H., and Verplanck, P.L. (2005) Questa Baseline and Pre-Mining Ground-Water Quality Investigation. 5. Well Installation, Water-Level Data, and Surface- and Ground-Water Geochemistry in the Straight Creek Drainage Basin, Red River Valley, New Mexico, 2001-03: U.S. Geological Survey Scientific Investigations Report 2005-5088 Nordstrom, D.K., McCleskey, R.B., Hunt, A.G., and Naus, C.A., (2005) Questa Baseline and Pre-Mining Ground-Water Quality Investigation. 14. Interpretation of Ground-water Geochemistry in Catchments other than the Straight Creek Catchment, Red River Valley, Taos County, New Mexico, 2002-2003: U.S. Geological Survey Scientific Investigations Report 2005-5050 Plumlee, G-S., Lowers, H., Koenig, A., Ludington, S. (2005) Questa Baseline and Pre-Mining Ground-Water Quality Investigation. 13. Mineral Microscopy and Chemistry of Mined and Unmined Porphyry Molybdenum Mineralization along the Red River, New Mexico: Implications for Ground-and Surface-water Quality: U.S. Geological Survey Open-File Report 2005-1442 Blanchard, P.J., Bartolino, J.R., Donohoe, L.C, McAda, D.P., Naus, C.A., and Morin, R.H. (2006) Questa Baseline and Pre-Mining Ground-Water Quality Investigation. 15. Methods of Phase II and III Well Installation and Development and Results of Well Logging, Hydraulic Testing, and Water-level Measurements in the Red River Valley, New Mexico, 2002-04: U.S. Geological Survey Scientific Investigations Report

IJst of documents identified by Chevron and evaluated by EPA for inclusion to the Administrative Record for the Proposed Plan.

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2006

2006

2006

2006

2006

2006

2006

2006

2006-5246 Caine, J.S. (2006) Questa Baseline and Pre-Mining Ground-Water Quality Investigation. 18. Characterization of Brittle Structures in the Questa Caldera and their Potential Impacts on the Bedrock Ground-water Flow, Red River Valley, New Mexico: U.S. Geological Survey Professional Paper 1729, p. 37. Kimball, B.A., Nordstrom, D.K., Runkel, R.L, and Verplanck, P.L. (2006) Questa Baseline and Pre-Mining Ground-Water Quality Investigation. 23. Quantification of Mass Loading from Mine and Unmined Areas along the Red River, New Mexico: U.S. Geological Survey Scientific Investigations Report 2006-5004 Naus, C.A., McAda, D.P., Myers, N.C. (2006) Questa Baseline and Pre-Mining Ground-Water Quality Investigation. 21. Hydrology and Water Balance of the Red River Basin, New Mexico 1930-2004: U.S. Geological Survey Scientific Investigations Report 2006-5040 Plumlee, G.S., Ludington, S., Vincent, K.R., Verplanck, P.L., Caine, J.S., and Livo, K.E. (2006) Questa Baseline and Pre-Mining Ground-Water Quality Investigation. 7. A Pictorial Record of Chemical Weathering, Erosional Processes and Potential Debris-Flow Hazards in Scar Areas Developed on Hydrothermally Altered Rocks: U.S. Geological Survey Open-File Report 2006-1205 Powers, Michael H., and Burton, Bethany L., 2006, Questa Baseline and Pre-Mining Ground-Water Quality Investigation. 24. Seismic Refraction Tomography for Volume Analysis of Saturated Alluvium in the Straight Creek Drainage and its Confluence with Red River, Taos County, New Mexico: U.S. Geological Survey Scientific Investigation Report 2006-5166 Smith, K.S. and others (2006) Questa Baseline and Pre-Mining Ground-Water Quality Investigation. 19. Leaching Characteristics of Composited Materials from Mine Waste-Rock Piles and Naturally Altered Areas near Questa, New Mexico: U.S. Geological Survey Scientific Investigation Report 2006-5165 \ ' Verplank, P.L., McCleskey, R.B., and Nordstrom, D.K. (2006) Questa Baseline and Pre-Mining Ground-Water Quality Investigation. 20. Water Chemistry of the Red River and Selected Seeps, Tributaries, and Precipitation, Taos County, New Mexico, 2000-2004: U.S. Geological Survey Scientific Investigation Report 2006-5028 Vincent, K. (2006) Questa Baseline and Pre-Mining Ground-Water Quality Investigation. 17. Geomorphology of the Red River Valley, Taos County, New Mexico, and Influence on


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2007

2008

2008

Ground-Water Flow in the Shallow Alluvial Aquifer: U.S. Geological Survey Scientific Investigations Repbrt 2006-5156 McAda, D.P. and Naus, CA. (2007) Questa Baseline and Pre-Mining Ground-Water QuaHty Investigation. 22; Ground-Water Budget for the Straight Creek Drainage Basin, Red River Valley, New Mexico: U.S. Geological Survey Scientific Investigations Report 2007-5149 Nordstrom, D.K., 2008, Questa Baseline and Pre-Mining Ground-Water Quality Investigation. 25. Summary of Results and Baseline and Pre-Mining Ground-Water Geochemistry, Red River Valley, TaOs County, New Mexico, 2001-2005: U.S. Geological Survey Professional Paper 1728 Vincent, K. (2008) Surficial Geologic Map Showing Late Quatemary Sediments Deposited by the Red River and Tributary Streams in the Middle Red River Valley, New Mexico: U.S. Geological Survey Scientific Investigations Report 2007-5156

Ust of documents identified by Chevron and evaluated by EPA for inclusion to the Administrative Record for the Proposed Plan.

10

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