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JD -7 Mine — Drainage Design Plan 27 <br />Sub -basin D -17 includes the 0.43 acre southern portion of the existing underground- waste -rock pile (Figure <br />12). Stormwater runoff from sub -basin D -6 flows to the interceptor ditch and the "OO1B -A South" <br />retention pond. A curve number of 80 was applied, representing sagebrush with grass understory in poor <br />condition. <br />4149A.140207 Whetstone Associates • <br />