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STORMWATER MANAGEMENT PLAN <br /> CRIPPLE CREEK AND •' GOLD MINING COMPANY <br /> Wilson Creek and Cripple Creek, can be seen on Figure 1 and various detail figures attached to this <br /> document. <br /> Cripple Creek and Wilson Creek are, in general, perennial streams below domestic wastewater treatment <br /> plants that are in both drainages for the City of Cripple Creek and the City of Victor, respectively Wilson <br /> Creek is ephemeral to intermittent in its upper reaches above the discharge from the Victor Municipal <br /> Sewage Treatment Plant. Arequa Gulch and Squaw Gulch are ephemeral Grassy Valley is intermittent <br /> before it reaches Beaver Creek. All tributaries to these drainages are ephemeral. <br /> Poverty Gulch is ephemeral in and above the area disturbed by the Site. An engineered diversion channel <br /> with capacity for flows from the 100-year 24-hour stormwater event has been constructed that reroutes <br /> stormwater around a portion of the mining activities before discharging stormwater back into the Poverty <br /> Gulch streambed. The channel is clay and riprap lined and includes energy dissipating inlet and outlet <br /> structures to reduce the potential for erosion. <br /> The Mining District is associated with a volcanic diatreme, which is highly brecciated and, as a result, <br /> relatively porous and transmissive. In addition, water drainage tunnels were constructed at various <br /> elevations above sea level during historic underground mining to drain underground mine workings. The <br /> deepest tunnel, Carlton Tunnel, facilitates downward movement of the infiltrating precipitation. Water flows <br /> perennially from the Carlton Tunnel. <br /> Mine operations do not involve discharges of process water. <br /> 1.3 Mining Activities <br /> Mining at the Site consists of the following basic steps: <br /> • Clearing and grubbing existing vegetation; <br /> • Stripping and stockpiling topsoil and other growth media; <br /> • Removing overburden; <br /> • <br /> Mining and hauling ore; <br /> • Extraction and beneficiation (processing) of ore; <br /> • Reclamation; <br /> • Various other support activities, such as security and environmental monitoring. <br /> 10 <br />