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include impacts from domestic water use, possible leakage from sanitary sewers, the Bear Mine <br />discharges, and other factors that are not related to the Sanborn Creek or Elk Creek Mines. <br />Similarly, both sample locations are located downstream of the adjacent Mountain Coal <br />Company, West Elk Mine discharge points and potentially other less distinct historic mine <br />discharges scattered along the river. <br />Flow in the river reflects natural seasonal flows from upland drainages plus regulated flows from <br />Paonia Reservoir and significant other upland irrigation water storage facilities. During 2010, the <br />typical spring flow in the river was substantially increased and contained significant amounts of <br />sediment from the routine annual scouring of the Paonia Reservoir. Summer and early fall flows <br />reflect discharges from upland storage reservoirs used downstream by the water rights holders. <br />No significant changes were noted, however, in the analytical data with nothing to suggest <br />adverse impact by the Elk Creek Mine or Sanborn Creek Mine to the River. <br />HN-1 - Lower Hawk's Nest Creek <br />Surface water monitoring site HN-1 Lower Hawk's Nest Creek, is monitored to verify that the <br />Sanborn Creek Mine does not have an adverse effect on the quality or quantity of runoff from <br />this ephemeral drainage. During 2010 there was, again, minimal flow in Hawk's Nest Creek <br />during spring snowmelt, and no flow after snowmelt was completed. An analysis of the limited <br />data suggests there is no adverse impact of the Sanborn Creek Mine to Lower Hawk's Nest <br />Creek. <br />• <br />11 <br />9