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3.0 — Best Management Practices for Stormwater Pollution Prevention <br />'i he only potential pollutant sources would be stormwater and associated sediments from the active <br />mine arca and topsoilltemporary material stockpiles. Excavation and haul equipment left orsite will be <br />located (parked) in active areas of the site where ditches, berms, and silt fences will be used as i3MPs. <br />These 13MPs will he modified as mining activities progress across the site. The primary site BMP will he <br />perm/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 />100%stonnwater containment of the site to the site outfall. A series of berm/fiber,hale catchments in road <br />the drainage ditch ma} be used as necessary. <br />There are pians to provide for a portable crusher or screening plant and to process asphalt material at this <br />site. All 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 be mobile and <br />sufficiently permed 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. i'he 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. CDPIIE Stormwater Permit requires 100% si:e <br />containment. <br />3.1 - Structural Practices <br />Stormwaters (precipitation) and associated sediments entering active pit and hauli-loading areas will be <br />contained b} using a combination of sediment retention berms, haul road ditches and silt fences (where <br />necessary) As there will he no waste rock or disposal area stockpiles at this site it will only be necessary <br />to install 13MPs adjacent to the active areas of the site. along haul roads and at site access points <br />WestWater Engineering APPENDIX C - 27 July 2012 <br />