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operations. Zone IV lies up gradient of the disturbed <br />• area and drains toward the mine workings. Waters in <br />this 0.9 sq.mi, drainage will be collected in a diversion <br />ditch on the northwest boundary of the disturbed area and <br />channeled southward into the bottom of the draw. <br />Within the disturbed area, Zone V, a1I runoff waters will <br />be channeled into a 15-acre foot sediment control pond. <br />Although no discharges from this pond are planned, an <br />NPDES permit, No. CO-0031925, has been secured for this <br />facility. <br /> Quantities of Water <br /> No gauging stations exist on the ephemeral stream in Bolton <br />• Draw. However, diversion re cords of a ditch right l ocated. <br /> in the NW 1/4 of the NE 1/4 of Sec.ll, T8N, R78[d give some <br /> indication of historic flows at this midpoint in the drainage <br /> near the proposed mine. Div ersion records for this right are <br /> presented in Table II. <br /> Table II <br /> Records of Diversions o f the Bolton Ditch <br /> Dates of Use Estimated Average Flow <br /> 6/1/76 - 7/1/76 2.9 CFS <br /> 6/20/75 - 7/10/75 2.0 CFS <br /> 5/10/74 - 6/10/74 5.0 CFS <br /> 7/9/73 - 8/10/73 7.0 CFS <br />. 4/23/72 - 2/7/72 10.0 CFS <br />14 <br />