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800 W.8th Street <br /> ��� Pueblo,Colorado 81003 <br /> (719)582-5588 <br /> www.jesik.us <br /> Contents <br /> INTRODUCTION............................................................................................................................................1 <br /> EXECUTIVE SUMMARY.................................................................................................................................1 <br /> Location & Description.................................................................................................................................2 <br /> Description...............................................................................................................................................3 <br /> HydrologicSoil Groups.................................................................................................................................3 <br /> Climate.........................................................................................................................................................4 <br /> SiteImpacts..................................................................................................................................................4 <br /> Offsite Stormwater Impacts (Basins Al,A2, D1, D2, D3, D4, and E)........................................................4 <br /> Operations Area Site Impacts (Basin B)....................................................................................................5 <br /> Onsite Stormwater Impacts (Basin B, C and F).........................................................................................6 <br /> DrainageBasins............................................................................................................................................7 <br /> MajorDrainage Basin...............................................................................................................................7 <br /> MinorDrainage Basins.............................................................................................................................7 <br /> Basin A—South Offsite Stormwater.....................................................................................................8 <br /> BasinB—Operations Area....................................................................................................................8 <br /> Basin C—Laydown and Stockpile Areas...............................................................................................8 <br /> Basin D— East Offsite Stormwater.......................................................................................................9 <br /> Basin E—Offsite Natural Drainage.......................................................................................................9 <br /> Basin F—Access Road Improvements..................................................................................................9 <br /> STORMWATER MANAGEMENT..................................................................................................................10 <br /> HydrologicCriteria .................................................................................................................................10 <br /> Run-on Water from the South (Basin A) ............................................................................................11 <br /> OperationsArea (Basin B)..................................................................................................................11 <br /> Laydown, Stockpile Area (Basin C) and Detention Pond....................................................................11 <br /> Surface Water Diversion Channels.........................................................................................................12 <br /> Conclusion..................................................................................................................................................13 <br /> APPENDIX A- EXISTING CONDITIONS.........................................................................................................15 <br /> APPENDIX B- HYDROLOGIC CALCULATIONS..............................................................................................16 <br /> APPENDIX C-CHANNEL CALCULATIONS....................................................................................................17 N <br /> 0 <br /> N <br /> 00 <br /> N <br /> c-I <br /> Dawson Mine Surface Water <br />