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100 years. This operation will be removing pollutant point sources and processing it of-site <br /> in a carefully regulated manner. <br /> As part of newly proposed operations,BMP's have been developed to minimize impacts <br /> from the historic waste pile as it is disturbed. For a complete understanding of the mining <br /> operation,please refer to our DRMS permit work(permit#to be determined later by <br /> DRMS). All SWMP components are illustrated on the maps included in Section 3. <br /> • Stormwater Diversion: <br /> o Pre-Existing Waste Rock: <br /> • Drainage control within the Affected Area has been considered using <br /> the U.S. Soil Conservation Service,Technical Release 55: urban <br /> Hydrology for Small Watersheds, USDA(U.S. Department of <br /> Agriculture), June 1986 and the Federal Highway Administration <br /> Hydraulic Engineering Circulars HEC-11 & HEC-15 for design <br /> guidance. <br /> • Due to the short time of project duration,it has been determined <br /> sufficient to control sediment run-off with a perimeter silt fence and <br /> hay bales during the excavation operations. Once the dump is <br /> removed,Venture Resources will grade the site to match the <br /> underlying natural topography. Reclamation will commence as <br /> prescribed in Exhibit D of the DRMS permit. <br /> • if any steep,narrow channels of natural run-off corridors present <br /> themselves they shall be rip-rapped on an-'as-needed"basis after <br /> inspection by Venture Resources' professional engineering staff. In <br /> this event,Type L riprap,sized nominally with a median diameter of <br /> D;o=9 inches,shall be hand placed at a depth of l 2-18 inches. <br /> Rubble and/or slightly weathered stone sorted on-site from available <br /> material that meets this size specification shall be acceptable for use. <br /> • Materials Handling and Spill Prevention: There will be several structural BMP's <br /> employed to manage waste rock removal. Additionally,several non-structural <br /> techniques will also be implemented_ <br /> o Truck Loading: Operators will be instructed on how to avoid spills of <br /> waste rock. They will be instructed to continually monitor this and scoop up <br /> spills that may happen around the equipment and return the rock to the <br /> appropriate place. <br /> o Chemical Storage:No chemicals on site. <br /> o Mobile Construction Equipment: Any loaders,excavators.dump trucks, <br /> etc.shall be well maintained and in proper working order to avoid <br /> unnecessary leaks of oil,coolant,or any other fluids. Operators will be <br /> instructed to do a walk-around safety inspection to identify problems at the <br /> start of each shift. Any maintenance may only be performed offsite. Re- <br /> fueling is done via a mobile servicing contract. There are no equipment <br /> washing facilities on site. <br /> o Housekeeping Trash: There will be rather insignificant generation of <br /> rubbish waste associated with routine work habits of up to 3 part-time <br /> 87 <br />