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2.05.3(4) <br />. (4) Ponds, Impoundment and Diversions <br />(a) A general plan and detailed design plan for each sediment <br />pond, water impoundment and diversion proposed to be constructed <br />within the permit area. <br />Figure 2.05.3(4)(a)-1 and Map 2.05(4)-2 are taken from the <br />prior Operator's former permit #77-232 to identify the present <br />drainage system for the mine site. <br />2.05.3(4)(a)(i) <br />(i) General Plan <br />On August 18 & 19, 1992 a vegetation survey was performed at the <br />Red Canyon Mine Site. The vegetation monitoring report is included <br />in the Permit Document as Appendix H. <br />Run-off from the mine site (if any) initially flows into an <br />agricultural irrigation system, the Carbon Ditch. The Carbon Ditch <br />flows into Ward Creek about one mile downstream of the mine site. <br />The drainage area of Ward Creek is about 20.2 square miles near <br />Cedaredqe according to the local USGS office. The areal extent of <br />the reclaimed area at the mine site amounts to 23 acres. Therefore <br />the reclaimed mine site only contributes about 0.18$ of the <br />• drainage area of Ward Creek. <br />Run-off from the mine site should not have a measurable effect on <br />the downstream receiving stream standards for the following <br />reasons: <br />1) The sediment pond has not discharged nor has it had a <br />significant amount of water in it since the mine was <br />reclaimed. This indicates that the mine site may seldom <br />if ever contribute overland surface flow to the <br />downstream receiving waters. <br />2) The following soil loss comparison demonstrates that the <br />untreated drainage from the reclaimed mine site does not <br />contribute additional suspended solids above natural <br />conditions because the vegetation on the reclaimed areas <br />is better than adjacent areas. <br />3) The reclaimed mine site only contributes 0.18$ of the <br />total Ward Creek drainage area. Therefore, the potential <br />volume of surface run-off from the mine site is <br />insignificant compared to the volume of run-off generated <br />from the entire Ward Creek drainage area. <br /> <br />-96a- <br />Rev. 11-25-92 <br />~~10 <br />