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3.0 — Rest Management Practices for Stormwater Pollution Prevention <br />The only potential pollutant sources would be stormwater and associated sediments from the active <br />mine area and topsoil;temporary material stockpiles. Excavation and haul equipment left onsite w ill be <br />located (parked) in active arras of the site where ditches, berms, and silt fences will he used as 13MPs. <br />These l3MPs will be modified as mining activities progress across the site. The primary site RMP will be <br />berm/silt fence combination which extends along the road ditch and across the entire base of the active <br />site/working areas. The berm is extended as activity moves across the site. The berm/silt fence provides <br />I00%stormwater containment of the site to the site outfall A series of bermrfiberrhale catchments in road <br />the drainage ditch may be used as necessary. <br />"1 here are plans to provide for a portable crusher or screening plant and to process asphalt material at this <br />site. An material will be handled onsite using dragline, bulldozers and front-end loaders to temporarily <br />stockpile and load to the relevant process equipment. Process/asphalt equipment will he mobile and <br />sufficiently hermed when onsite. Material stockpiles may he produced and reduced on a daily basis or for <br />longer term stockpiling and will be conveniently located adjacent to active mine pit areas as excavation <br />activities progress or lower along the haul road. No refuse and acid forming or toxic materials will be <br />involved in this operation. The operation will produce sand, gravel, and soil materials with no chemicals <br />required for processing and refuse will not be generated. Sand and gravel are basically inert materials. <br />Only by direct precipitation will stormwater enter the site. CDPHE Stormwater Permit requires 140% site <br />containment. <br />3.1 - Structural Practices <br />Stormwaters (precipitation) and associated sediments entering active pit and haulrloading areas will be <br />contaiaed by using a combination of sediment retention beans, haul road ditches and silt fences (where <br />necessary). As there will be no waste rock or disposal area stockpiles at this site it will only be necessary <br />to install BMPs adjacent to the active areas of the site. along haul roads and at site access points <br />WestWater Engineering APPENDIX C - 42 July 2012 <br />