Imperial EIS - Table of Contents

UNITED STATES DEPARTMENT OF THE INTERIOR
BUREAU OF LAND MANAGEMENT
EL CENTRO FIELD OFFICE

IMPERIAL ENVIRONMENTAL IMPACT STATEMENT

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TABLE OF CONTENTS

LIST OF FIGURES

Figure S.1: Imperial Project General Location Map
Figure S.2: Imperial Project Vicinity Map
Figure S.3: Imperial Project Mine and Process Area Facilities
Figure S.4: Imperial Project Mine and Process Area - Projected Final Contours
Figure S.5: West Pit Alternative - Mine and Process Area Facility Details
Figure S.6: West Pit Alternative - Mine and Process Area Projected Final Contours
Figure S.7: East Pit Alternative - Mine and Process Area Facility Details
Figure S.8: East Pit Alternative - Mine and Process Area Projected Final Contours
Figure S.9: Complete Pit Backfill Alternative - Mine and Process Area Projected Final Contours
Figure 1.1: Imperial Project General Location Map
Figure 1.2: Imperial Project Vicinity Map
Figure 2.1: Imperial Project Facility Locations
Figure 2.2: Imperial Project Mine and Process Area Facilities
Figure 2.3: Imperial Project Mine and Process Area - Projected West Pit Contours
Figure 2.4: Imperial Project Mine and Process Area - Projected Final Contours
Figure 2.5: Imperial Project Mine and Process Area and Vicinity - Projected Final Contours
Figure 2.6: Typical Cross Section of Heap Leach Containment System
Figure 2.7: Existing and Proposed Transmission Lines
Figure 2.8: Access Roads and Open Routes of Travel
Figure 2.9: Diversions of Washes Within the Project Mine and Process Area
Figure 2.10: Cross-Section of West Pit West Diversion Channel
Figure 2.11: Reclamation Methods Applied Within the Mine and Process Area for Major Project Components
Figure 2.12: West Pit Alternative - Mine and Process Area Facility Details
Figure 2.13: West Pit Alternative - Mine and Process Area Projected Final Contours
Figure 2.14: East Pit Alternative - Mine and Process Area Facility Details
Figure 2.15: East Pit Alternative - Mine and Process Area Projected Final Contours
Figure 2.16: Complete Pit Backfill Alternative - Mine and Process Area Projected Final Contours
Figure 3.1: Generalized Regional Geologic Map
Figure 3.2: Simplified Geologic Cross Section through the West Pit
Figure 3.3: Regional Holocene Fault Map
Figure 3.4: Historic Epicenter Map
Figure 3.5: Historic Mining Districts in the Vicinity of the Imperial Project
Figure 3.6: Principal Washes Within the Project Mine and Process Area
Figure 3.7: Watersheds Upstream of Project Mine and Process Area
Figure 3.8: FEMA Floodplain Zones in the Vicinity of the Project Area
Figure 3.9: Delineated "Waters of the United States" Within the Project Mine and Process Area
Figure 3.10: Amos-Ogilby-East Mesa Ground Water Basin and Ground Water Production Wells Near the Project Area
Figure 3.11: Simplified Cross Section A-A= (Northeast-Southwest) Through the Project Area Showing Hydrologic Units.
Figure 3.12: Simplified Cross Section B-B= (Northwest-Southeast) Through the Project Area Showing Hydrologic Units
Figure 3.13: Location Map of Imperial Project Area Piezometer Holes, Monitor and Test Production Wells and Ground Water Potentiometric Map
Figure 3.14: Special Biological Resource Management Areas Located in the Vicinity of the Project Area
Figure 3.15: Vegetation and Habitat Associations Within the Imperial Project Mine and Process Area
Figure 3.16: Composite Aerial Photograph Showing the Boundary of the Imperial Project Mine and Process Area
Figure 3.17: Selected Topographic and Biological Landmark Features in the Vicinity of the Project Area
Figure 3.18: Location of Key Observation Points for Visual Evaluations
Figure 4.1: Delineated "Waters of the United States" Dredged or Filled Within the Project Mine and Process Area
Figure 4.2: Current View of the Project Mine and Process Area from Ogilby Road (KOP #1)
Figure 4.3: Proposed Action - Projected View of the Project Mine and Process Area After Final Reclamation from Ogilby Road (KOP #1)
Figure 4.4: Current View of the Project Mine and Process Area from Black Mountain (KOP #2)
Figure 4.5: Proposed Action - Projected View of the Project Mine and Process Area After Final Reclamation from Black Mountain (KOP #2)
Figure 4.6: Current View of the Project Mine and Process Area from a Hilltop Near Indian Pass in Picacho Peak Wilderness (KOP #3)
Figure 4.7: Proposed Action - Projected View of the Project Mine and Process Area After Final Reclamation from a Hilltop Near Indian Pass in Picacho Peak Wilderness (KOP #3)
Figure 4.8: Current View of the Project Mine and Process Area from an Informal Camping Area on Indian Pass Road (KOP #4)
Figure 4.9: Proposed Action - Projected View of the Project Mine and Process Area After Final Reclamation from an Informal Camping Area on Indian Pass Road (KOP #4)
Figure 4.10: Proposed Action (Post-Mining/Pre-Final Reclamation) - Projected View of the Project Mine and Process Area from Ogilby Road (KOP #1)
Figure 4.11: Proposed Action (Post-Mining/Pre-Final Reclamation) - Projected View of the Project Mine and Process Area from Black Mountain (KOP #2)
Figure 4.12: Proposed Action (Post-Mining/Pre-Final Reclamation) - Projected View of the Project Mine and Process Area from a Hilltop Near Indian Pass in Picacho Peak Wilderness (KOP #3)
Figure 4.13: Proposed Action (Post-Mining/Pre-Final Reclamation) - Projected View of the Project Mine and Process Area from an Informal Camping Area on Indian Pass Road (KOP #4)
Figure 4.14: Complete Pit Backfill Alternative - Projected View of the Project Mine and Process Area from Black Mountain (KOP #2)
Figure 4.15: Complete Pit Backfill Alternative - Projected View of the Project Mine and Process Area from a Hilltop Near Indian Pass in Picacho Peak Wilderness (KOP #3)
Figure 5.1: Locations of the Projects Considered in the Cumulative Impacts Analysis
Figure 5.2: Cumulative Ground Water Consumption and Recharge from the Amos-Ogilby-East Mesa Basin

LIST OF TABLES

Table S.1: Summary of Potential Environmental Effects and Mitigation Measures
Table 1.1: Summary of Principal Issues of Concern Identified in Comments on the November 1996 Draft EIS/EIR
Table 1.2: Summary of Issues Identified in Scoping Comment Letters Submitted in 1997
Table 1.3: Principal Revisions to the Proposed Action Including Reclamation Plan
Table 1.4: Agency Authorizing Actions Required for the Proposed Action
Table 2.1: Estimated Disturbed, Reclaimed and Undisturbed Acres for the Proposed Action
Table 2.2: Projected Surface Dimensions, Depth from Surface, and Pit Floor Elevations of the Open Pits
Table 2.3: Reclamation Methods to be Applied to Areas Disturbed Within the Mine and Process Area
Table 2.4: Anticipated Reclamation Activities Schedule
Table 2.5: Reclamation Milestone Schedule
Table 2.6: Estimated Disturbed and Undisturbed Acres for the West Pit Alternative
Table 2.7: Estimated Disturbed and Undisturbed Acres for the East Pit Alternative
Table 3.1: Summary of Soil Characteristics within the Project Mine and Process Area
Table 3.2: Estimated Peak Runoff In Washes Through the Project Mine and Process Area
Table 3.3: Summary of Physical Data From Selected Piezometer Holes, Monitoring Wells, and Test Production Well
Table 3.4: Calculated Hydraulic Conductivities of Alluvial and Bedrock Aquifers
Table 3.5: Calculated Aquifer Hydraulic Parameters From Pumping and Recovery Test
Table 3.6: Water Quality Data from Project Monitoring and Production Wells
Table 3.7: Federal and State Ambient Air Quality Standards for Criteria Pollutants
Table 3.8: Secondary Criteria Pollutants from Emissions of ROG, NO_x, and SO_x.
Table 3.9: Plant Species of Concern Known to Occur in the Vicinity of the Area of the Proposed Action
Table 3.10: Wildlife Species of Concern Known to Occur in the Vicinity of the Area of the Proposed Action
Table 3.11: USFWS Special Status Species and California Species of Concern Bat Species Which Could Roost On, or Forage Over, the Imperial Project Area
Table 3.12: Summary of Cultural Resources Identified within the Area of the Proposed Action
Table 3.13: BLM Visual Resource Management Classes
Table 3.14: Summary of Reported Deer Hunter Success Rates for Years 1990 - 1995
Table 3.15: Traffic Volume Counts on Roads in the Vicinity of the Project Area
Table 4.1: Summary of Maximum Probable Seismic Events and Effects
Table 4.2: Summary of Calculated Well Drawdown After 20 Years
Table 4.3: Calculated Drawdown of Selected Wells After 20 Years
Table 4.4: List of Potential Emission Sources and Type for the Proposed Action
Table 4.5: Summary of Total Calculated Emissions of Regulated Air Pollutants
Table 4.6: List of Project "Non-Road" Engines and Applicable Criteria
Table 4.7: List of Modeled, Non-Fenceline Discrete Receptor Points Locations
Table 5.1: List of Cultural Resources Identified Within the Area of Cumulative Analysis Summarized by Project