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COR-040000 Stormwater Management Plan <br />The approximate areas that are disturbed during the mining process, including portal, vent holes, <br />DRAs, stockpiles, and access roads are as follows: <br />Van 4 Shaft: 7.9 acres <br />Total permitted area: 8.4 acres <br />The total impervious area from support facilities such as the shop and hoist house will remain as <br />it exists. No additional new facilities are planned to be built at this time. <br />a) Area Subject to Effluent Limitation Guidelines (COR-040000, §I.B.2) <br />Discharges that are determined to be considered process water, and therefore subject to numeric <br />effluent limitations, are waters discharged from the mine or water flowing through ore rock <br />stockpiles. No process waters will be discharged from the underground mining activities. Water <br />encountered will be used for drilling and dust suppression activities within the mine. It is not <br />anticipated that waters will be processed flowing through the ore rock stockpiles. Ore rock <br />stockpiles will be hauled to the processing plant in Utah frequently, and will not remain at the <br />site for extended periods of time. Ore rock stockpiles that are located at the site will be <br />contained with best management practices, such as berms, designed to contain a 100-year, 24 <br />hour storm event. Due to the efforts to manage stormwater, no areas of the site are subject to <br />numeric effluent limitations contained in 40 CFR subchapter N. <br /> <br />Van 4 Shaft SWMP 3 Denison Mines (USA) Corp.