Kensington Gold Project Final Supplemental Environmental Impact ...

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Appendix A: Water Quality Analysis A-1 Kensington Gold Project Final SEIS Appendix A Attachments A-1 through A-3 provide the basis for the predicted National Pollutant Discharge Elimination System (NPDES) permit limits and compliance evaluation that have been included in the Final Supplemental Environmental Impact Statement (SEIS) for Alternatives B and D. Attachment A-1 summarizes the rationale for the permit limits applicable to outfalls 001 (treated mine water) and 002 (tailings storage facility [TSF] discharge). Attachment A-2 provides additional details on the determination of water quality-based effluent limits (WQBELs). Attachment A-3 summarizes the water quality modeling that was performed to determine the TSF discharge quality. The approach of using expected NPDES permit limits as a tool to assess potential downstream water quality impacts is consistent with the 1997 Final SEIS. That document also showed that the dry tailings facility (DTF) discharge, outfall 002 under Alternative A, would meet NPDES permit limits. Outfall 001, the discharge of treated mine water, is the same under all alternatives. The results of this analysis, along with the Ecological Risk Assessment provided in Appendix C, form the basis for the evaluation of the predicted impacts on surface water quality and freshwater aquatic resources included in the Final SEIS.
Attachment A-1 – Basis for NPDES Permit Effluent Limitations A. Statutory and Regulatory Basis for Limits A-2 Kensington Gold Project Final SEIS Appendix A Sections 101, 301(b), 304, 308, 401, 402, and 405 of the Clean Water Act (CWA) provide the basis for effluent limitations and other conditions in the draft permit. USEPA evaluates the discharges with respect to these sections of the CWA and the relevant NPDES regulations to determine which conditions to include in an NPDES permit. USEPA first determines which technology-based limits must be incorporated into the permit. USEPA then evaluates the effluent quality expected to result from these controls to see whether water quality standards for the receiving waters might still be exceeded. If exceedances would occur, USEPA must include Water Quality-based Effluent Limitations (WQBELs) in the permit. The permit limits reflect whichever requirements (technology-based or water quality-based) limits are more stringent. B. Technology-Based Evaluation Section 301(b) of the CWA requires industrial dischargers to meet technology-based effluent guidelines established by USEPA, which are enforceable through their incorporation into an NPDES permit. For dischargers in industrial categories for which USEPA has not yet issued effluent guidelines, and for types of discharges not covered by an applicable effluent guideline, best professional judgment (BPJ) is used to establish technology-based permit limitations. The 1972 amendments to the CWA established a two-step approach for imposing technology-based controls. In the first phase, industrial dischargers were required to meet a level of pollutant control based on the best practicable control technology currently available (BPT). The second level of pollutant control was based on the best available technology economically achievable (BAT). And in 1977, enactment of section 301(b)(2)(E) of the CWA allowed the application of best conventional pollutant control technology (BCT) to supplement BPT standards for conventional pollutants with cost-effectiveness constraints on incremental technology requirements that exceed BPT. The BPT/BAT/BCT system of standards does not apply to a new source, which is defined by USEPA as a source, the construction of which is commenced after the publication of proposed regulations prescribing a standard of performance, which will be applicable to the source. Direct dischargers that are new sources must meet new source performance standards (NSPS), which are based on the best available demonstrated control technology. At 40 CFR 440, USEPA has established technology-based effluent guidelines for the Ore Mining and Dressing Point Source Category. Subpart J of these guidelines, which became effective on December 3, 1982, is applicable to mines that produce gold-bearing ores from open-pit or underground operations and to mills that use the froth-flotation process, alone or in conjunction with other processes, for the beneficiation of gold. At the Kensington Mine, discharge of mine drainage through outfall 001 to Sherman Creek was previously permitted based on the NSPS. In addition, discharges to East Fork Slate Creek through outfall 002 will also be subject to the NSPS of 40 CFR 440. Technology-based NSPS of 40 CFR 440 applicable to mine drainage are presented in Table 1.
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Appendix B: Essential Fish Habitat
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B-3 Kensington Gold Project Final S
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Fresh Water B-9 Kensington Gold Pro
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Sediment Quality B-11 Kensington Go
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B-13 Kensington Gold Project Final
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Literature Cited B-15 Kensington Go
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Ecological Risk Assessment of Aqueo
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FIGURES FINAL Figure 1.1 Final Exte
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TEC threshold effect concentration
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Figure 1.1 Final Extent of TSF and
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Figure 1.3 Tailings Placement and E
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2.0 PROBLEM FORMULATION FINAL This
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FINAL LSL has a surface area of 8.1
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FINAL A wide variety of benthic mac
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2.3 Conceptual Site Model FINAL Bas
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FINAL subsequent consumption of COP
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Management Goal 3: FINAL ⇒ Protec
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FINAL This assessment endpoint was
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Table 2.2 Summary of Management Goa
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Table 3.1 Comparison of Decant Wate
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FINAL Chapman et al. (2000) reporte
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FINAL Shading of cells in Table 3.2
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FINAL The bioaccumulation potential
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4.0 RISK ANALYSIS FINAL The Risk An
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4.2 Exposure Assessment 4.2.1 Recep
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FINAL ingestion rates and water ing
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4.2.3 Bioaccumulation Factors and E
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FINAL reported NOAEL and LOAEL valu
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4.3.1.2 Operational Water Table 4.6
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FINAL While both Cr +6 and Cr +3 ar
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FINAL 10 8 gallons would be orders
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4.3.4.2 Post-Closure Conditions FIN
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Table 5.1 Summary of Risk Character
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FINAL scenario. Chromium concentrat
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FINAL forage base, primarily throug
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FINAL would have sufficient light p
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Table 5.4 Data Corresponding to Fig
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FINAL Table 5.5 Summary of Risk Cha
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FINAL contain elevated levels of ar
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FINAL It is also important to note
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FINAL volume of water present and t
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FINAL DOE-SRS (Department of Energy
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FINAL Mount, D.R., D.D. Gulley, J.R
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FINAL USFS (U.S. Forest Service). 2
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Attachment A. Dietary NOAEL and LOA
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Table B.1 Safe and Toxic Water Conc
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Table B.2 Safe and Toxic Soil and W
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FINAL Havas, M., and G.E. Likens. 1
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FINAL Tetra Tech, Inc. C-86 Decembe
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Table C.1a Bioaccumulation Factors
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Table C.2 Calculated Aluminum EPC V
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Table C.3a Bioaccumulation Factors
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REFERENCES FINAL Brooks, R.R. 1972.
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FINAL Tetra Tech, Inc. C-96 Decembe
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FINAL reported that coho salmon avo
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Table D.2 Literature Values for Sed
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Table D.2b TSS Effects on Salmonid
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Table D.2d TSS Effects on Adult Sal
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Table D.4 Matrix Table for Alevin S
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Table D.2e TSS Effects on Non-Salmo
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Table D.10 Effects of Deposited Sed
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Table D.12 Matrix Table for All Rec
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Specific Examples of Subaqueous Tai
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FINAL community in the tailings are
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FINAL Goldes, S.A. 1983. Histologic
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FINAL Schubel, J.R., A.H. Auld, and
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FINAL Tetra Tech, Inc. C-126 Decemb
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Table E.1 Calculated Doses for Each
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Appendix D Preliminary Reclamation
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D-2 Kensington Gold Project Final S
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2.1 Permanent Closure and Final Rec
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Post-Mining Inspection Schedule D-1
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Attachment D-1 Preliminary Reclamat
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Appendix E Best Management Practice
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E-2 Kensington Gold Project Final S
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Kensington Gold Project Final SEIS
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Figures: Figure 1 - General Facilit
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aware that in an emergency, only th
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is to streamline the gathering and
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operating and response procedures t
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Safety and Health Administration (O
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Coeur Alaska has established the fo
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After testing of an employee for re
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employee to ensure that the employe
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A release from either vertical or h
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2.3 Receiving Environment Risk Anal
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• Nearest dwelling, water body, w
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Rapid response caches will be secur
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4. The truck driver, vessel enginee
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Appendix - 2 Initial Spill Report F
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APPENDIX 4 MATERIAL SAFETY DATA SHE
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Unalaska Skagway Haines Sitka Nome
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Purpose and Need for Policy During
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planning goal of Modified Landscape
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Other Standard Operating Procedures
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� Regular inspection of fuel line
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Appendix F Old-Growth Habitat
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F-2 Kensington Gold Project Final S
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F-4 Kensington Gold Project Final S
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Appendix G Ground Water Quality
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,; ‘) ‘. ,/”’ “5k+9B .. 0
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Table G-2. Laboratory Methods, Repo
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Table G-3. Summary of Ground Water
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TabIe G-3. Summary of Ground Water
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Appendix H Migratory Birds: Birds o
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H-4 Kensington Gold Project Final S
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I-1
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Appendix J Biological Assessment/Bi
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CONTENTS 1. INTRODUCTION 1-1 2. PRO
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Acronyms and Abbreviations µPa mic
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Kensington Gold Project BA/BE Novem
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Background Coeur Alaska Kensington
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Figure 2 3
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Associated monitoring programs woul
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SOP #5: Vessels will operate at low
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Point and Slate Creek Cove transpor
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- reducing the amount of habitat to
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Kensington Gold Project SPILL RESPO
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EMERGENCY RESPONSE FORM - INJURY an
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Kensington Gold Project - Initial S
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Appendix 3 - Contact Information a.
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APPENDIX 5 TYPICAL SOIL EROSION AND
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Appendix K USEPA and State of Alask
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K-2 Kensington Gold Project Final S
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K-4 Kensington Gold Project Final S
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Appendix L: Draft SEIS Comments and
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Section 1 Comment Summary L-1
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Comment Summary The Forest Service
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Ten commenters who supported Altern
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Mailing Location Table L-1 Demograp
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