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6.3.3(2)(c) <br />Drainage control within the Affected Area has been considered using the U.S. Soil Conservation Service, Technical <br />Release 55: Urban Hydrology, for Small Watersheds, USDA (U.S. Department of Agriculture), June 1986 and the <br />Federal Higinvay Administration Hydraulic Engineering Circulars HEC-11 & HEC-15 for design guidance. <br />Due to the short time of project duration, it has been determined sufficient to control sediment run-off with a <br />perimeter silt fence during the excavation operations. Once the dump is removed, Venture Resources will grade the <br />site to match the underlying natural topography. Reclamation will commence as prescribed in Exhibit D. <br />If any steep, narrow channels of natural run-off corridors present themselves they shall be rip-rapped on an "as- <br />needed" basis after inspection by Venture Resources' professional engineering staff. In this event, Type L riprap, <br />sized nominally with a median diameter of DSO=9 inches, shall be hand placed at a depth of 12-18 inches. Rubble <br />and/or slightly weathered stone sorted on-site from available material that meets this size specification shall be <br />acceptable for use. <br />Appendix to Exhibit C <br />1, Waste Stream Characterization: SPLP lab analysis of in-situ waste rock dump solids <br />2. Well Map Locations, CO Division of Water Resources (w/ associated permit documents) <br />3. Old Town Mine map, USGS Professional Paper 359, ECONOMIC GEOLOGY OF THF, CENTRAL CITY <br />DISTRICT, GILPIN COUNTY, COLORADO, Sims, P. K.,, Drake, A. A., and Tooker, E. W., 1963 <br />4. CO WCQD Stormwater Management Plan <br />5. US EPA Record of Decision, ROD R08-88/019,1988 <br />6. CO DMG "Reclamation Feasibility Report - Virginia Canyon", December 2001 <br />7. Wildeman's Water Handbook for Metal Mining <br />8. FEMA Flood Plain Map (Map #08-335A-080075-Pg. 12) <br />Page 8 of 8