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Site Drainage: Surface drainage flows north and northwest over the topsoil stockpile and waste <br />rock area to an earthen berm, which works as a temporary sediment trap for the site. The <br />drainage from the berm discharges to the north into a tributary of Big Gypsum Creek, an <br />intermittent creek located approximately 3/4 mile north of the mine workings area. Big Gypsum <br />Creek ultimately discharges west to the Dolores River, which ultimately discharges northwest to <br />the Colorado River. The topographic lines on Figure 2D in Appendix A depict the site flow <br />pattern, and Figure 1 shows the regional topography. <br />Table 3-4. West Sunday Mine Bulk Storage Inventorv <br /> <br />- SoCG Unrt° <br />Contents ` <br />Volume y, <br />Containment , . <br />OverffllxPrevention _ <br /> _: al <br />Diesel Fuel Tank Diesel Fuel 1000 Lined Earthen Automatic Shutoff <br /> Berm, 1297 gal Sensor, Attended <br /> Capacity Loading <br />Oil Drums Engine 3-55 Containment Unit, Visual Inspection <br />On Rack Lubricating > 61 gal Capacity <br /> Oil, Hydraulic <br /> Oil, and/or <br /> Rock Drill Oil <br />Oil Drums Engine 4-55 Containment Unit, Visual Inspection <br /> Lubricating > 61 gal Capacity <br /> Oil, Hydraulic <br /> Oil, and/or <br /> Rock Drill Oil <br />Potential spill volumes that could occur due to overfilling or a ruptured hose during fueling: <br />Potential spill volume: >0 to 1,000 gallons <br />Estimated rate: 80 gallons per minute <br />(based on a maximum pumping rate of 80 gallons per <br />minute from the fill truck and a maximum of 30 seconds to <br />turn off the pump) <br />Direction of spill flow: Northeast to Big Gypsum Creek, which drains west to the <br />Dolores River <br />C1 <br />Denison Mines (USA) Corp. 16 SPCC Plan <br />Sunday Mines December 2007