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Site Drainage: Surface drainage flows north over the topsoil stockpile and waste rock area to an <br />earthen berm, which works as a temporary sediment trap for the site. The drainage from the <br />berm discharges to the north into a tributary of Big Gypsum Creek, an intermittent creek located <br />approximately 3/4 mile north of the mine workings area. Big Gypsum Creek ultimately <br />discharges west to the Dolores River, which ultimately discharges northwest to the Colorado <br />River. The topographic lines on Figure 2C in Appendix A depict the site flow pattern, and <br />Figure 1 shows the regional topography. <br />Table 3-3. Topaz Mine Bulk Storage Inventorv <br />• <br />SPCC Contents Volume Confainrr?ent' Ovrf1 Prevention <br /> <br />Diesel Fuel Tank Diesel Fuel 1000 Lined Earthen Automatic Shutoff <br /> Berm, 1688 gal Sensor, Attended <br /> Capacity Loading <br />Oil Drums Engine 3- 55 Drum Spill Visual Inspection <br />On Rack Lubricating Containment Pallet <br /> <br />Oil, Hydraulic , <br />> 61 gal Capacity <br /> Oil, and/or <br /> Rock Drill Oil <br />Oil Drums Engine 5-55 Drum Spill Visual Inspection <br /> Lubricating Containment Pallet <br /> <br />Oil, Hydraulic , <br />> 61 gal Capacity <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 /> <br />Denison Mines (USA) Corp. <br />Sunday Mines <br />14 <br />SPCC Plan <br />December 2007