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As part of newly proposed operations, BMP's have been developed to minimize impacts from the historic <br />waste pile as it is disturbed. For a complete understanding of the mining operation, please refer to our <br />DRMS permit work (pen-nit # to be determined later by DRMS). All SWMP components are illustrated on <br />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 the US. <br />Soil Conservation Service, Technical Release 55: Urban Hydrology for Small <br />Fhatersheds, USDA (U.S Department ofAgriculture), June 1986 and the <br />Federal Highway Administration Hydraulic Engineering Circulars HEC-11 & <br />HEC-15 for design guidance. <br />Due to the short time of project duration, it has been detennined sufficient to <br />control sediment run-off with a perimeter silt fence during the excavation <br />operations. Once the dump is removed, Venture Resources will grade the site to <br />match the 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 themselves <br />they shall be rip-rapped on an "as-needed" basis after inspection by Venture <br />Resources' professional engineering staff. In this event, Type L riprap, sized <br />nominally with a median diameter of D50=9 inches, shall be hand placed at a <br />depth of 12-18 inches. Rubble and/or slightly weathered stone sorted on-site <br />from available material that meets this size specification shall be acceptable for <br />use. <br />Materials Handling and Spill Prevention: There will be several structural BMP's employed to <br />manage waste rock removal. Additionally, several non-structural techniques will also be <br />implemented. <br />o Truck Loading: Operators will be instructed on how to avoid spills of waste rock. <br />They will be instructed to continually monitor this and scoop up spills that may happen <br />around the equipment and return the rock to the appropriate place. <br />o Chemical Storage: No chemicals on site. <br />o Mobile Construction Equipment: Any loaders, excavators, dump trucks, etc. shall be <br />well maintained and in proper working order to avoid unnecessary leaks of oil, coolant, <br />or any other fluids. Operators will be instructed to do a walk-around safety inspection to <br />identify problems at the start of each shift. Any maintenance may only be performed <br />offsite. Re-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 rubbish waste <br />associated with routine work habits of upto 3 part-time employees. A 55 gal. drum fitted <br />with a lid and trash bag liner will be located outside for trash collection. This will be <br />emptied as necessary and taken to the municipal trash disposal facility at the Clear Creek <br />County Transfer Station. <br />Sediment and Erosion Prevention: "There will be several structural BMP's employed to collect <br />and contain sediment and prevent erosion. Additionally, several non-structural techniques will <br />also be implemented. <br />o Pre-Existing Waste Rock: Downgradient from the pre-existing waste rock pile and <br />related load-out site silt fence shall be installed to prevent sediment and erosion. <br />Operators will be trained to monitor this silt fence and repair as needed. As part of <br />rigorous reclamation measures prescribed in the DRMS permit, final grading and re- <br />vegetation of the Affected Area will be performed in once the pile is removed. Seeding <br />will occur to coincide with the appropriate time of year for proper germination, whether <br />it is closer to spring or fall season. <br />Page 4 of 9