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t <br />TABLE OF CONTENTS <br /> A. INTRODUCTION. 7 <br /> B. REGIONAL HYDROLOGY. 2 <br />'~ ~ 1 . Climate 2 <br /> 2. Streamflow 3 <br />~ 3. Surface Water Inventory 5 <br /> 4. Groundwater 7 <br /> a. Geology 7 <br /> b. Occurrence and Qaulity of Groundwater 7 <br /> C. FLOOD HYDROLOGY 11 <br /> 1. Probable Maximum Thunderstorm 11 <br /> 2. PMTS Flood Potential in the Vicinity of Rienau Mine 12 <br /> 3. 100-, 50-, and 25-Year Floods 17 <br /> D. SITE-SPECIFIC HYDROLOGY 21 <br /> 1. Watersheds Impacted by Mining 21 <br /> 2. Annual Water Balance of Curtis Creek 21 <br /> E. REFUSE DISPOSAL 22 <br /> F. IMPACTS ON WATER QUALITY. 22 <br /> 1. Sediment yield 22 <br /> 2. Criteria for Sizing Settling Ponds and Drainage Plan 26 <br /> a. Predicted Erosion from Mine Site 26 <br /> 3. Chemical and Geological Considerations 31 <br /> 4. Mine Drainage 32 <br /> G. OPERATIONAL HYDROLOGY 33 <br /> 1. Water Resource 33 <br /> a. Additional Data 34 <br /> 'H. DISCUSSION 36 <br /> I. REFERENCES 37 <br /> J. APPENDICES I-V <br />