2009-05-19_REVISION - M1977416 (28)

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COR-030000 Stormwater Management Plan St. Jude Mine: Surface drainage flows northeast to an earthen berm, which directs the flow to the northwest into a temporary sediment basin on the northwest side of the site. The basin discharges to the north into an unnamed tributary of Big Gypsum Creek, located approximately 3/ mile north of the mine workings area. Topaz mine: Surface drainage flows north to an earthen berm, which works as a temporary *sediment basin for the site: The drainage from the berm discharges to the north into an unnamed tributary of Big Gypsum Creek, located approximately 3/ mile north of the mine workings area. West Sunday Mine: Surface drainage flows north and northwest to an earthen berm, which works as a temporary sediment basin for the site. The drainage from the berm discharges to the north into an unnamed tributary of Big Gypsum Creek, located approximately 3/ mile north of the mine workings area. Carnation Mine: Surface drainage flows north and northwest over a series of earthen berms which act as water bars to slow the flow rate of the runoff. A portion of the south half of the site drains into a temporary sediment basin that is located in the middle of the site. The drainage from the berms and the basin discharges to the north into a tributary of Big Gypsum Creek, located approximately V2 mile north of the mine area. Big Gypsum Creek (EPA Segment ID COGULD03) is an intermittent creek that drains northwest approximately 3 to 6 miles from the mine sites to the Dolores River, which generally drains northwest and ultimately discharges to the Colorado River. There are no discharges to waters subject to Total Maximum Daily Loads (TMDLs) from the project (EPA 2007b). - -- - - i) Site Map (§I.C.2): Site maps meeting the requirements of the permit are included in Appendix B. • Denison Mines (USA) Corp. Sunday Mines SWMP 5