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SVRC Pit Evaluation <br /> Table of Contents <br /> BACKGROUND AND PURPOSE 1 <br /> Water Level History 1 <br /> Other Planned Pits 1 <br /> Report Structure 1 <br /> EXECUTIVE SUMMARY 2 <br /> Model Results Summary 3 <br /> SVRC Mitigation Options 3 <br /> Impacts by Other Pits 3 <br /> Mitigation Runs 4 <br /> Pit Scenario 2-Only Section 20 Pits 4 <br /> Pit Scenario 3-Only Monarch Pits 5 <br /> Pit Scenario 4-Section 20 and Monarch Pits 5 <br /> Pit Scenario 5-All Pits(Section 20,Monarch and SVRC 5 <br /> CONCLUSIONS AND RECOMMENDATIONS 5 <br /> EXECUTIVE SUMMARY TABLES(within text) <br /> Table 1-Pit Scenario 1 Impacts-Only SVRC(no Mitigation) 3 <br /> Table 2-Pit Scenario 1 Impacts-Only SVRC(with Flow to Pipeline) 3 <br /> Table 3-Pit Run Impact Summary 5 <br /> REPORT SUMMARY FIGURES 7 <br /> Figure 1-Study Area and SEO Wells 8 <br /> APPENDIX A-GROUNDWATER EVALUATION AND MODELING 9 <br /> Available Data 9 <br /> HYDROGEOLOGY 9 <br /> Surficial Geology 10 <br /> Well Depth 10 <br /> Bedrock Elevation 10 <br /> Water Levels 10 <br /> Depth to Water 11 <br /> Seasonal Fluctuations 11 <br /> Saturated Thickness 12 <br /> Well Yield 12 <br /> Aquifer Transmissivity 12 <br /> Hydraulic Conductivity(K) 12 <br /> MODELING 12 <br /> Boundary Conditions 13 <br /> Modflow"River"Package 13 <br /> Model Calibration-Pre-pit Run 14 <br /> Hydraulic Conductivity(K)Distribution 15 <br /> Mass Balance 15 <br /> Water Level Changes Caused by the SVRC 15 <br /> SVRC Mitigation Options 16 <br /> Model Error and Uncertainty 17 <br /> SOURCES 17 <br /> McGrane Water Engineering,LLC. Page ii <br />