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other surface features. Permanent roads, reclaimed roads, existing roads, and roads to be included <br />in the Topaz permit boundary are shown in Figure C-3. <br />D.5.6 Surface Water Diversions and Drainage Control <br />Two natural ephemeral drainages run from the south to the north of the east and west sides of the <br />surface facilities area. Surface water diversion ditches currently exist to the south, and <br />upgradient, of the surface facilities to divert stormwater away from the surface facilities. A ] 00- <br />year, 6-hour storm event was used to evaluate the sizing of these existing channels and ensure <br />that they will be of sufficient size to permanently divert water around the mining area following <br />mining activities and reclamation. These diversion ditches are large enough to contain a 100- <br />year, 6-hour storm event; however, minor slope and alignment modifications will be made. <br />Additionally, an earthen berm and catchment will be re-constructed along the toe of the expanded <br />WRA. Another berm will be located at the top of the WRA to prevent surface water from <br />running off of the surface facilities over the WRA. The catchment and berms are designed <br />discharge a 100-year, 24-hour storm event via an emergency overflow spillway located to the <br />west of the catchment basin. The emergency overflow spillway for the 100-year storm discharges <br />to the ephemeral channel to the west of the catchment basin. <br />D.5.7 Sanitary and Solid Waste Disposal <br />A septic system is located west of the maintenance shop; however, this system will not be used <br />during future mining operations. A portable toilet will be provided for use during mining <br />activities and will be maintained by a mine contractor. Small quantities of inert solid waste <br />(rubble and debris), as defined by the Colorado Mined Land Reclamation Act, will be disposed of <br />in the WRA during mine operations. All other solid waste (including, but not limited to, tires, <br />hoses, and plastic sheeting) will be disposed of in a roll-off container. The container will be <br />emptied and contents disposed of on a regular basis by a mine contractor. All solid waste will be <br />properly disposed of in accordance to state and local regulations. <br />D.5.8 Fuel Storage and Use <br />Diesel fuel will be stored in a 1,000-gallon steel above-ground storage tank, located south of the <br />maintenance shop. The fuel tank will supply diesel fuel for the heavy equipment used in mining <br />operations. The tank is placed in a bermed and plastic lined secondary containment area. Fuel is <br />5-I 5-2007 Exhibit D Mining Plan D-1$ <br />