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<br />Somerset Mining Company <br />1993 AHR <br />' Page 4 <br />data for Springs 9 and 10 also show the elevated conductivity <br />' measurements. <br />Spring 11 was covered during the reclamation of the Hawksnest east <br />mine. Therefore, no flow was recorded for Spring 11 during the <br />' year. <br />Monitoring data for the Sanborn Creek Mine Discharge, outfall 011, <br />' is presented in Appendix 2. The mine water discharge has had two <br />problems during the year. One problem is non-compliance discharge <br />because the water contained suspended solids in excess of discharge <br />' permit limits. This problem has been addressed by constructing a <br />sump in the idle C-Seam workings. This sump will provide <br />additional settling time for the water and should therefore allow <br />the water to be discharged in compliance with applicable discharge <br />' limits. <br />The second problem is that the mine discharge water has not passed <br />' the whole effluent toxicity tests required by the Colorado <br />Department of Health discharge permit. The mine water is toxic to <br />Ceriodanhnia dubia (water fleas). In response to this problem, the <br />Colorado Department of Health has directed Somerset Mining Company <br />to perform an aquatic impairment study to determine if the mine <br />water discharge is having an adverse effect on the North Fork of <br />the Gunnison River. This study is to be performed during 1994. <br />' The results of the study will influence future monitoring <br />requirements for the mine water. <br />' The annual mine inflow study is presented on the Sanborn Creek <br />Mine, Mine Inflow Map, Map 50. The study was performed on January <br />4, 1994. The estimated mine inflow, based on the study is 175 gpm. <br />This figure is about 258 higher than the measured flow pumped from <br />the mine. The discrepancy could be attributed to the accuracy of <br />measuring the mine inflows or the fact that the flow into the mine <br />was greater on January 4th than the average inflow for 1993. <br />Groundwater Information <br />t Results: <br />Results of the groundwater monitoring data collected during 1993 <br />' are presented in Appendix 3. <br />Graphs are included to present flow, conductivity, iron, total <br />' dissolved solids and Manganese for monitoring wells H-10, B-6, SC- <br />1, SC-2 and SC-3. The graphs compare monitoring data from 1991 <br />through 1993. <br />1 <br />t <br />