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Cripple Creek & Victor Gold Mining Company Squaw Gulch Valley Leach Facility Design <br />changes may require OMLR review and approval as more detailed information is <br />provided pursuant to approval of this facility. <br />6.4 Sediment Control <br />Sediment control during VLF construction activities will be the responsibility of the <br />general contractor hired by CC &V. The contractor shall incorporate Best Management <br />Practices (BMPs) and construct all necessary temporary erosion prevention and <br />control facilities in order to comply with applicable regulations. Typical erosion control <br />features are presented on Drawing A260. <br />As part of the Phase 1 and 2 surface water diversion design, temporary sediment <br />collection ponds have been incorporated, as shown on Drawings A500 and A510 for <br />Phase 1 and 2, respectively. The sediment collection ponds have been sized to <br />contain twice the 25- year /24 -hour storm event with freeboard. CC &V (or CC &V's <br />general contractor) will be required to pump the sediment collection pond level down <br />after major storm events to prevent overtopping. As the ponds are designed as <br />excavations into native ground (with no liner), some infiltration of stormwater into the <br />foundation is expected. <br />Project No.: 74201125G0 Page 35 <br />1 September 2011 <br />amec° <br />