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SUPPLEMENTAL ENVIRONMENTAL
IMPACT STATEMENT
SMOKY CANYON MINE, PANELS B & C
LEAD AGENCY: U.S. Department of the Interior
Bureau of Land Management
Upper Snake River Districts
Pocatello Field Office
JOINT LEAD AGENCY: U.S. Department of Agriculture
Forest Service
Caribou-Targhee National Forest
PROJECT LOCATION: Caribou County, Idaho
DATE Draft SEIS Filed with EPA: July, 2001
DATE Final SEIS Filed with EPA: April, 2002
MAILING ADDRESS FOR FURTHER
INFORMATION AND COPIES OF THE Final Jeffrey Cundick
SEIS: SEIS Project Manager
BLM Pocatello Field Office
1111 N. 8th Ave.
Pocatello, ID 83201
(208) 478-6354
ABSTRACT
This Final Supplemental Environmental Impact Statement analyzes impacts related to the development of Panels B and C at
the J. R. Simplot Smoky Canyon Mine in southeast Idaho. The Proposed Action includes developing two mine pits, haul roads
and overburden disposal areas. Use of existing support and mill facilities would continue. These actions are included in a 1983
Record of Decision for the entire mine. This supplemental analysis reviews potential impacts from selenium and newly listed
threatened, endangered and sensitive species and updates the previous impact analyses for other resources. Alternatives to
the Proposed Action are also analyzed and site specific mitigation measures developed. The agency preferred Alternative is
the Proposed Action as proposed in this FSEIS.
RESPONSIBLE OFFICIAL FOR SEIS: Idaho State Director
Bureau of Land Management
ITEM HAS BEEN DIGITIZED
United States Department of the Interior
BUREAU OF LAND MANAGEMENT
Upper Snake River Districts
Pocatello Field Office
1111 North 8th Avenue
Pocatello, Idaho 83201-5789
In Reply
Refer To:
3500 APR 1 8 ZiiUZ
(1-012890)
Dear Reader:
Enclosed is the Final Supplemental Environmental Impact Statement (SEIS) for the Simplot Smoky
Canyon Mine, Panels B and C, prepared by the Bureau of Land Management (BLM) Pocatello Field
Office and the U. S. Forest Service (USFS) Caribou-Targhee National Forest.
This SEIS analyzes the direct, indirect and cumulative impacts associated with development of open pits,
haul roads, overburden disposal areas, and related facilities that would be utilized during operation of the
B and C Panels. In particular, mitigation and monitoring related to potential mobilization of selenium
contained in overburden produced by these operations is addressed herein.
This Final SEIS has been prepared as a full-text version equivalent to the Draft SEIS that was distributed
to the public in July, 2001, with the exception that comments received during review of the draft
document have been addressed with added or modified text in this Final SEIS. The Final SEIS is being
distributed in a three-hole punched format with binder spine and cover inserts that you can file or install
in your own binder. This document constitutes the complete SEIS for this project.
The BLM will file the Final SEIS with the U.S. Environmental Protection Agency (EPA). EPA will then
publish a Notice of Availability in the Federal Register. Beginning on the publication date of EPA’s
Notice of Availability in the Federal Register, a 30-day availability period will commence. In addition to
EPA’s Notice of Availability, BLM will publish a separate Notice of Availability with additional project
information in the Federal Register.
Following the close of the Final SEIS availability period, a Record of Decision on this project will be
issued by the BLM, with input from the USFS. A 30-day period for potential appeals on the Record of
Decision will follow public release of that document.
If you would like further information on this project or the above-described process, contact Jeff Cundick,
SEIS Project Manager, at 208-478-6354 or at the address shown on the cover page of the SEIS.
Sincerely,
Joe Kraayenbrir
Acting Manager"
Pocatello Field Office
ITEM HAS BEEN DIGITIZED
m\mL
SMOKY CANYON MINE SUPPLEMENTAL EIS
TABLE OF CONTENTS
SUMMARY . x
CHAPTER 1 - INTRODUCTION/ PURPOSE & NEED .1-1
1.0 Introduction . 1-1
1.1 Background.1-2
1.2 Purpose And Need.. . 1-5
1.3 Authorizing Actions .1-5
1.4 Relationship to Agency and Other Policies and Plans .1-7
1.5 Public Scoping.1-8
1.5.1 Comment Letters .1-9
1.5.2 Issues.1-10
1.6 Project History.1-16
1.6.1 Background .1-16
1.6.2 Past Environmental Impact Reviews. 1-17
1.6.3 Selenium Issue History.1-17
CHAPTER 2 - DESCRIPTION OF THE PROPOSED ACTION AND ALTERNATIVES.2-1
2.0 Introduction .2-1
2.1 Existing Operations .2-1
2.1.1 Location .2-1
2.1.2 Land Ownership.2-2
2.1.3 Facilities Description.2-4
2.1.4 Mining Operations.2-5
2.1.5 Water Management .2-9
2.1.6 Mill and Tailings Operations.2-10
2.1.7 Existing Environmental Monitoring Program.2-11
2.1.8 Reclamation.2-11
2.1.9 Hazardous Materials.2-13
2.1.10 Petroleum Management.2-13
2.1.11 Hazardous Waste.2-15
2.1.12 Safety.2-15
2.2 Proposed Action.2-15
2.2.1 Disturbance .2-17
2.2.2 Panels .2-17
2.2.3 Overburden Handling .2-18
2.2.4 Related Actions .2-25
2.2.5 Reclamation .2-26
2.3 Alternatives to the Proposed Action.2-30
2.3.1 Alternative A - Handling of Wasterock to Eliminate External Disposal of
Seleniferous Waste .2-31
2.3.2 Alternative B - No External Wasterock Disposal.2-32
2.3.3 No Action Alternative . 2-33
2.4 Features Common to the Proposed Action and Alternatives .2-33
2.4.1 Common Features .2-33
2.4.2 Overburden Cap.2-36
2.4.3 Best Management Practices. 2-37
Smoky Canyon Mine , Panels B & C FSEIS i
2.5 Environmental Monitoring .2-41
2.6 Summary Comparison of Alternatives .2-42
2.7 Alternatives Considered but Eliminated from Detailed Analysis.2-55
2.7.1 Underground Mining.2-55
2.7.2 No Pit Backfill.2-55
2.7.3 No Tailings Disposal Onsite .2-56
2.7.4 Purchasing Ore Elsewhere.2-56
2.7.5 Overburden Area Infiltration Barrier .2-57
2.8 Historic Mining Environmental Impact Investigation Report.2-59
2.9 Monitoring and Mitigation.2-60
2.9.1 Required Monitoring and Mitigation .2-60
2.9.2 Agency Preferred Alternative .2-65
CHAPTER 3 - AFFECTED ENVIRONMENT.3-1
3.1 Geology, Minerals, and Topography .3-1
3.1.1 Regional Geologic Setting .3-1
3.1.2 Stratigraphy .3-1
3.1.3 Structural Setting .3-2
3.1.4 Seismicity and Geotechnical Stability.3-2
3.1.5 Overburden Characterization .3-9
3.1.6 Mineral Resources .3-17
3.1.7 Topographic Resources.3-18
3.1.8 Paleontological Resources.3-19
3.2 Air Resources and Noise.3-19
3.2.1 Climate and Meteorology .3-19
3.2.2 Air Resources.3-20
3.2.3 Noise .3-23
3.3 Water Resources.3-23
3.3.1 Surface Water Resources .3-24
3.3.2 Surface Water Quality .3-34
3.3.3 Surface Water Uses.3-40
3.3.4 Groundwater Resources.3-41
3.3.5 Groundwater Quality.3-51
3.3.6 Groundwater Rights and Use.3-58
3.3.7 Springs and Seeps.3-58
3.4 Soils and Watershed .3-61
3.4.1 Soil Survey.3-62
3.4.2 Field Procedures .3-63
3.4.3 Laboratory Procedures and Analysis .3-63
3.4.4 Soil Characteristics.3-63
3.4.5 Selenium and Trace Elements .3-79
3.5 Vegetation .3-84
3.6 Wetlands.3-90
3.7 Wildlife Resources.3-94
3.7.1 Mammals .3-94
3.7.2 Birds.3-98
3.7.3 Reptiles and Amphibians .3-100
3.8 Fisheries and Aquatic Resources.3-100
3.9 Threatened, Endangered, and Sensitive Species .3-108
3.9.1 Threatened, Endangered, Candidate and Sensitive Species Lists.3-108
3.9.2 Threatened, Endangered and Candidate Species - Plants.3-109
3.9.3 Threatened, Endangered and Candidate Species - Wildlife.3-110
Smoky Canyon Mine , Panels B & C FSEIS
3.9.4 Sensitive Species - Plants .3-113
3.9.5 Sensitive Species - Wildlife.3-114
3.10 Grazing Management .3-127
3.11 Recreation and Wilderness .3-128
3.12 Visual Resources.3-130
3.12.1 Overview.3-130
3.12.2 Visual Resource Management .3-130
3.12.3 Key Observation Points . 3-131
3.13 Cultural Resources and Native American Concerns.3-138
3.13.1 Prehistoric and Historic Inhabitants in Southeastern Idaho.3-138
3.13.2 Previous Research.3-143
3.14 Social and Economic Resources .3-145
3.14.1 Social Resources .3-145
3.14.2 Economic Resources . 3-149
3.15 Transportation .3-155
3.16 Environmental Justice .3-157
CHAPTER 4 - ENVIRONMENTAL CONSEQUENCES.4-1
4.1 Geology, Minerals, and Topography .4-1
4.2 Air Resources and Noise. 4-15
4.3 Water Resources.4-21
4.4 Soils and Watershed .4-70
4.5 Vegetation .4-79
4.6 Wetlands.4-82
4.7 Wildlife Resources.4-86
4.8 Fisheries and Aquatic Resources.4-92
4.9 Threatened, Endangered, and Sensitive Species .4-96
4.10 Grazing Management .4-105
4.11 Recreation and Wilderness .4-107
4.12 Visual Resources.4-110
4.13 Cultural Resources and Native American Concerns.4-116
4.14 Social and Economic Resources .4-117
4.15 Transportation .4-122
4.16 Cumulative Effects.4-125
4.16.1 Geology, Minerals and Topography .4-128
4.16.2 Air and Noise .4-130
4.16.3 Water.4-131
4.16.4 Soil and Watershed .4-141
4.16.5 Vegetation .4-145
4.16.6 Grazing Management.4-148
4.16.7 Wetlands .4-151
4.16.8 Wildlife .4-153
4.16.9 Fisheries and Aquatic Resources.4-155
4.16.10 Threatened, Endangered, and Sensitive Species.4-157
4.16.11 Recreation & Wilderness .4-159
4.16.12 Cultural Resources and Native American Concerns.4-159
4.16.13 Social and Economic Resources .4-159
4.16.14 Visual Resources .4-160
Smoky Canyon Mine , Panels B & C FSEIS iii
CHAPTER 5 - CONSULTATION and COORDINATION.5-1
5.1 Public Participation Summary .5-1
5.1.1 Public Scoping Period and Meetings .5-1
5.1.2 EIS Mailing List.5-2
5.1.3 Distribution of the Draft SEIS .5-2
5.1.4 Final SEIS Distribution .5-2
5.1.5 Record of Decision.5-3
5.2 Methods by Which Public Input Is Evaluated.5-3
5.2.1 Consultation With Others .5-3
5.2.2 Consultation with Idaho Department of Environmental Quality.5-3
5.3 List of Preparers And Reviewers .5-4
5.4 Updated Mailing List: Smoky Canyon Mine Panels B and C SEIS.5-8
CHAPTER 6 - REFERENCES AND GLOSSARIES
References .6-1
Index.6-32
Acronyms .6-40
Units of Measure.6-46
Glossary .6-47
CHAPTER 7 - PUBLIC COMMENTS AND RESPONSES
Letter #1 (USEPA Region 10) .7-2
Letter #2 (US Geological Survey).7-25
Letter #3 (National Park Service).7-27
Letter #4 (Idaho Dept. Of Environmental Quality).7-29
Letter #5 (Idaho Dept. Of Lands) .7-31
Letter #6 (Simplot) .7-32
Letter #7 (Agrium) .7-101
Letter #8 (Peter Reide).7-106
Letter #9 (Idaho Rivers United) .7-108
Letter #10 (Greater Yellowstone Coalition) .7-110
Letter #11 (Caribou County Commission).7-128
Letter #12 (Idaho Dept. Of Lands) .7-130
Letter #13 (Idaho Dept. Of Environmental Quality).7-132
Letter #14 (Kelly Booth) .7-135
Letter #15 (Eldena Grover).7-135
LIST OF TABLES
Table 1.3-1 Major Permits, Approvals, and Consultations Potentially Required for the Smoky
Canyon Mine, Panels B & C.1-6
Table 1.5-1 Scoping Summary Smoky Canyon Mine Panels B and C.1-10
Table 2.1-1 Land and Mineral Ownership.2-2
Table 2.1-2 Smoky Canyon Mine Seed Mix .2-12
Table 2.1-3 Hazardous Materials Management, Simplot Smoky Canyon Project .2-14
Table 2.2-1 Summary of New Disturbed Acres - Proposed Action .2-17
Table 2.6-1 Effects Summary.2-43
Table 2.6-2 Comparison of Alternatives .2-51
Table 3.1-1 Average Concentration of Leachable Selenium, Cadmium and Zinc in Overburden
Stratigraphic Units and Weighted Average Concentrations for All Units .3-16
Table 3.2-1 State of Idaho and National Ambient Air Quality Standards.3-20
iv Smoky Canyon Mine , Panels B & C FSEIS
Table 3.2-2 Federal Mandatory Class I Airsheds Nearest the Smoky Canyon Mine Project . . 3-21
Table 3.2-3 Permitted Industrial Emission Sources - SE Idaho and SW Wyoming.3-22
Table 3.2-4 Sound Levels Associated with Ordinary Noise Sources.3-23
Table 3.3-1 Historic Stream Flow Measurement Summary - Tygee Creek .3-26
Table 3.3-2 Stream Flow Measurements during 2000 in the Tygee Creek Basin .3-26
Table 3.3-3 Stream Flow Measurement Data (cfs) - Smoky Creek.3-30
Table 3.3-4 Flood Flow Estimates - Smoky Canyon .3-31
Table 3.3-5 Streambed Embeddedness Data - Smoky Creek.3-33
Table 3.3-6 Streambed Substrate Particle Size Data by Maxim - Smoky Creek.3-34
Table 3.3-7 Historic Water Quality Data - Range of Values From 1979 - 1999 (mg/I .3-35
Table 3.3-8 Surface Water Sampling Locations, Project Area, Year 2000 by Maxim .3-37
Table 3.3-9 June 2000, Water Quality, Maxim Baseline Study, Selected Sites
and Parameters.3-38
Table 3.3-10 Project Area Elevated Elements, by Montgomery Watson (1997, 1999, 2000) . . . 3-39
Table 3.3-11 Well Completion and Elevation Data Smoky Canyon Mine .3-43
Table 3.3-12 Groundwater Quality in Alluvium and Bedrock, Smoky Canyon Mine Proposed
Panels B and C, First, Second and Third Quarter Sampling Results - 2000
(Maxim Technologies, Inc.).3-54
Table 3.3-13 Comparison of Mean Water Quality for Upper Pole, Upper Smoky, Lower Smoky
and Hoopes Spring Monitoring Sites (meq/l) .3-60
Table 3.4-1 Soil Mapping Unit Descriptions .3-65
Table 3.4-2 Criteria Used to Determine Topsoil Suitability .3-70
Table 3.4-3 Topsoil Suitability Parameters for Soils in the Project Area .3-72
Table 3.4-4 Suitable and Marginally Suitable Soils in the Project Area.3-75
Table 3.4-5 Erosion Potential and Hydrologic Characteristics of Soils in the Project .3-77
Table 3.4-6 Maximum Selenium and Trace Element Concentrations for Soils Within the
Project Area.3-83
Table 3.5-1 Vegetation Communities and Principal Plant Species .3-84
Table 3.5-2 Mean Concentrations of Elements for all Samples and Grasses and
Forbs Individually.3-87
Table 3.5.3 Generalized Concentrations of Elements in Plant Tissue that are Considered Deficient,
Sufficient, and Toxic for Plant Growth .3-87
Table 3.5-4 State of Idaho Noxious Weeds .3-89
Table 3.6-1 Summary of Existing Wetlands in the Smoky Canyon Drainage .3-90
Table 3.7-1 Vegetation Types and Current Amount (acres) in the Greater Project Area and the
Cumulative Effects Area .3-94
Table 3.9-1 USFWS and USFS Threatened, Endangered and Sensitive Plant Species
Reported to Occur in Caribou County, Idaho.3-108
Table 3.9-2 USFWS and USFS Threatened, Endangered, Candidate and Sensitive Animal
Species Reported to Occur in Caribou County, Idaho .3-109
Table 3.13-1 Previous Cultural Resource Inventories.3-143
Table 3.14-1 Labor Force and Unemployment .3-150
Table 3.14-2 Employment by Industrial Sector.3-151
Table 3.14-3 Local Government Finances .3-153
Table 3.14-4 Idaho Phosphate Sales and Royalties for Operations on Federal Lands.3-154
Table 3.14-5 Idaho Phosphate Industry Employment.3-155
Table 4.1-1 Acid Base Accounting Data Summary - Formation Specific Overburden.4-5
Table 4.1-2 Weighted Average for SPLP Data for Panels B and C Combined .4-5
Table 4.1-3 Column Test Weighted Average Results for Future Smoky Canyon Overburden . . 4-8
Table 4.1-4 Weighted Average Concentrations for COPCs in Pore Volumes.4-9
Table 4.1-5 Operational Effects to Topography .4-12
Table 4.2-1 Annual Fugitive and Mobile Air Emission Estimates.4-17
Smoky Canyon Mine , Panels B & C FSEIS v
Table 4.2-2 Noise Level Measurements at the Study Area.4-18
Table 4.3-1 Results of “t” Tests for Suspended Sediment Load Comparisons of Streams in
the Project Area.4-27
Table 4.3-2 Results of “t” Tests for Turbidity and Embeddedness Comparisons of Streams in
the Project Area.4-27
Table 4.3-3 Calculated Annual Average Seepage.4-40
Table 4.3-4 Water Chemistry of Panel D and Panel E Seeps (mg/I).4-44
Table 4.3-5 Lower Pole Canyon Creek Spring Season TRC Mariah Data 1991-2000.4-45
Table 4.3-6 Groundwater Modeling Results for the Proposed Action Below Panel B.4-48
Table 4.3-7 Groundwater Modeling Results for the Proposed Action at the Culinary Well .... 4-49
Table 4.3-8 Groundwater Modeling Results for the Proposed Action at Lower Smoky Spring . 4-49
Table 4.3-9 Comparison of Areas Containing Seleniferous Overburden.4-61
Table 4.3-10 Annual Estimated Seepage Rate Through Seleniferous Overburden.4-62
Table 4.3-11 Groundwater Modeling Results for Alternatives A and B Below Panel B.4-63
Table 4.3-12 Groundwater Modeling Results for Alternatives A and B at the Culinary Well .... 4-63
Table 4.3-13 Groundwater Modeling Results for Alternatives A and B at Lower Smoky Spring . 4-64
Table 4.4-1 Change in Existing Conditions by Alternative.4-74
Table 4.4-2 Land Disturbance Comparison by Alternative .4-78
Table 4.5-1 Acres of Impact on Existing Vegetation Communities .4-80
Table 4.6-1 Summary of Impacts in the Smoky Canyon Drainage .4-84
Table 4.6-2 Summary of Existing Wetlands and Wetland Impacts in the Smoky Canyon
Drainage, by Wetland Type.4-84
Table 4.7-1 Current Amount (acres) and Type of Vegetation and the Percent of Which
Would be Impacted Under the Proposed Action as Compared to the Greater
Project Area and the Cumulative Effects Area.4-88
Table 4.8-1 Compliance with INFISH Minerals Management RMOs.4-95
Table 4.9-1 Current Extent (Acreage) of Identified Vegetation Types Present in the Baseline
Survey Area and Cumulative Effects Analysis Area, and Acreage and Percent of
each Type that would be Impacted by the Proposed Action.4-99
Table 4.16-1 Spring 1998 Selenium and Flow Data, and Load Calculations for Sage Creek . . 4-134
Table 4.16-2 Total Selenium Analysis for the Culinary and Industrial Wells .4-138
Table 4.16-3 Water Quality in Tailings Pond No.2 Monitoring Sites (mg/I) .4-140
Table 4.16-4 Summary of Selenium Concentrations in Soil for Reclamation Sites and
Adjacent Undisturbed Locations at Smoky Canyon Mine.4-143
Table 4.16-5 Selenium Concentrations in Reclaimed Areas at Smoky Canyon Mine Compared
to Recently Developed Interim Suitability Standards for Soils .4-144
Table 4.16-6 Vegetation Impacts .4-146
Table 4.16-7 Soil/Growth Medium and Vegetation Sampling Results (mg/kg) .4-147
Table 4.16-8 Comparison of Average Vegetation Selenium Values 1998 and 2000 (mg/kg) . . 4-148
Table 4.16-9 Allotments in Cumulative Effects Area.4-149
Table 4.16-10 Selenium Content in Vegetation at Smoky Canyon Reclaimed Areas .4-151
Table 4.16-11 Previous and Proposed Disturbance to Wetlands and Waters of the U.S. in the
Smoky Canyon Mine Cumulative Assessment Area.4-153
vi Smoky Canyon Mine , Panels B & C FSEIS
LIST OF FIGURES
Figure 1.0-1 Location Map.1-3
Figure 1.0-2 Project Area.1-4
Figure 2.1-1 Surface Ownership .2-3
Figure 2.1-2 Historic and Existing Mine Operations.2-6
Figure 2.2-1 Proposed Action Mine Plan .2-19
Figure 2.2-2 Cross Section Through Proposed Action Mine Pits .2-20
Figure 2.2-3 Typical Haul Road Cross Section.2-21
Figure 2.2-4 Proposed Action Post Reclamation Plan .2-22
Figure 2.2-5 Typical Overburden Disposal Site Cross Section.2-27
Figure 2.2-6 External Overburden Margin Recharge Area Design.2-28
Figure 2.2-7 A-Panel Recharge Area Design.2-29
Figure 2.3-1 Alternative A Reclamation Plan .2-34
Figure 2.3-2 Alternative B Reclamation Plan .2-35
Figure 2.4-1 Storm Water Pollution Prevention Plan .2-38
Figure 2.4-2 Diversion Ditch Cross Section .2-39
Figure 3.1-1 General Geologic Map.3-3
Figure 3.1-2 Typical East-West Geologic Cross Section .3-4
Figure 3.1-3 Generalized Stratigraphic Column For Southeastern Idaho.3-5
Figure 3.1-4 Typical Cross Section Phosphoria Formation.3-6
Figure 3.1-5 State of Idaho Earthquake Risk Map Per Uniform Building Code.3-7
Figure 3.1-6 Epicenter Map of SE Idaho Earthquakes, Intensity > 5 .3-10
Figure 3.1-7 Contaminant Leaching & Mobilization Conceptual Model.3-15
Figure 3.3-1 Surface Water Features: Watershed Boundaries, Springs, and Streams .3-28
Figure 3.3-2 Surface Water Quality Monitoring Sites.3-29
Figure 3.3-3 Groundwater Conditions Map.3-32
Figure 3.3-4 Hydrogeologic Cross Section A-A’.3-47
Figure 3.3-5 Hydrogeologic Cross Section B-B’.3-48
Figure 3.3-6 Surface Water Quality Monitoring Sites With Stiff Diagrams .3-57
Figure 3.4-1 Soil Mapping Units of the Smoky Canyon Area .3-68
Figure 3.5-1 Vegetation Types in Project Area.3-85
Figure 3.6-1 Wetland Delineation.3-92
Figure 3.7-1 Big Game Winter Range .3-97
Figure 3.8-1 Location of Existing 1999 Aquatic Sampling Stations.3-102
Figure 3.8-2 Aquatic Biological Study Reaches and Study Sites in Smoky Creek,
August 2000 . 3-103
Figure 3.9-1 Bald Eagle Survey Area.3-116
Figure 3.9-2 Bat Survey Locations.3-117
Figure 3.9-3 Northern Goshawk and Three-toed Woodpecker Calling Stations and
Flammulated Owl Call Responses.3-124
Figure 3.9-4 Grouse Survey Area .3-125
Figure 3.9-5 Amphibians .3-126
Figure 3.10-1 Grazing Allotments in the Cumulative Effects Area .3-129
Figure 3.11-1 Inventoried Roadless Areas of Sage Creek and Stump Creek.3-132
Figure 3.11-2 USFS Road Designations and Associated Recreational Facilities.3-133
Figure 3.12-1 Visual Resources. 3-136
Figure 3.12-2 KOP Viewpoints.3-137
Figure 4.2-1 Mobile Fugitive Emissions - Haul Trucks.4-19
Figure 4.3-1 Proposed Action Mine Plan .4-32
Figure 4.3-2 Proposed Action Post Reclamation Plan .4-33
Figure 4.3-3 Best Fit Curve Weighted Average Selenium Column Test Data.4-42
Smoky Canyon Mine , Panels B & C FSEIS vii
Figure 4.3-4 Groundwater Model Results for Cadmium, Sulfate, TDS - Proposed Action .4-51
Figure 4.3-5 Groundwater Model Results for Manganese - Proposed Action.4-52
Figure 4.3-6 Groundwater Model Results for Selenium - Proposed Action.4-53
Figure 4.3-7 Best Fit Curve Weighted Average Selenium Column Test Data Using 0.72 mg/I as
Starting Point Groundwater Model Results for Cadmium, Sulfate, TDS -
Alternatives A and B .4-56
Figure 4.3-8 Groundwater Model Results for Cadmium, Sulfate, TDS - Alternatives A and B . . 4-66
Figure 4.3-9 Groundwater Model Results for Manganese - Alternatives A and B.4-67
Figure 4.3-10 Groundwater Model Results for Selenium - Alternatives A and B.4-68
Figure 4.4-1 Topsoil Suitability Ratings Within the Project Area.4-77
Figure 4.9-1 Habitat Map.4-100
Figure 4.12-1 Post-Mining Views.4-111
Figure 4.12-2 Panel A Aerial Photo .4-112
Figure 4.12-3 Post Reclamation Views .4-113
Figure 4.12-4 Proposed Action Aerial Photo .4-114
Figure 4.15-1 Transportation and Roads.4-123
Figure 4.16-1 Cumulative Effects Area .4-126
Figure 4.16-2 Phosphate Resources in Cumulative Effects Area.4-129
Figure 4.16-3 Vegetation Types in Cumulative Effects Area .4-150
Figure 4.16-4 Cumulative Effects Area with Previous Cultural Resource Inventory Areas.4-161
LIST OF APPENDICES
Appendix 1A Laws and Regulations for Mining on Public Lands
Appendix IB Native American Consultation
Appendix 2A Original 1999 Mine Plan
Appendix 2B Best Management Practices
Appendix 2C Infiltration Barriers Review of Feasibility
Appendix 2D Historic Mining Environmental Impact Investigation Report
Appendix 2E Environmental Monitoring Plan
Appendix 3A Maxim 2000 Water Quality Data
Appendix 3B Watershed Analysis
Appendix 4A Geotechnical Factors and Operational Practices
Appendix 4B Selenium Data for Southeast Idaho
Appendix 4C Infiltration Modeling
viii Smoky Canyon Mine , Panels B & C FSEIS
