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Foidel Creek, as the receiving drainage, is an intermittent stream and downstream use of surface water flows is <br />limited to irrigation. The change in streamFlow patterns is expected to extend the period of effective flow, thereby <br />'increasing rather than decreasing the potential for beneficial downstream use of surface water. <br />Summary of Probable Surface Water Hvdroloeic Consequences <br />The Eckman Park mining operations have resulted in increased dissolved solids concentrations in surface waters <br />adjacent to the disturbed areas, a shift in the surface water ion balance, and changes in the timing and volume of <br />surface water discharges. Suspended solids concentrations are not expected to increase. Witlt the exception of <br />increased dissolved solids concentrations, all potential surface water impact are either insignificant with respect to <br />[Ite surface hydrologic environment or will be effectively mitigated. The elevated dissolved solids concentrations <br />in the surface drainage system will only be significant during low-Flow periods. During these periods, the <br />contribution to stream Flows that are presently used or could potentially be used for irrigation is relatively small <br />and does not constitute a potential for material damage. <br />Colorado Yampa/Twentymile Coal Company is the only water user with registered surface water rights in [Ite <br />permit and adjacent areas. The potential localized hydrologic impacts will not adversely affect surface water use <br />•in these areas. As discussed in Section 779.16, surface water use is limited by relatively poor baseline water <br />quality. Potential mining-related surface water impacts will not result in any additional limitations on downstream <br />water users. <br />• <br />1946 Permit Ren. Permit Renewal 780-144-28 Revised 3118/97 <br />