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• MINREC,INC. ANNUAL HYDROLOGIC REPORT PAGE 2 <br /> SURFACE WATER QUALITY <br /> Appendix I contains the water quality information collected for North Thompson Creek. <br /> The quality information taken on North Thompson Creek, in May and September, is <br /> designed to monitor quality at the approximate high and low flow. <br /> The variation of the quality of North Thompson Creek as it passed the mines this year was <br /> similar to that which would be expected from the baseline monitoring data and the fact that <br /> the Abandoned Mined Lands peat bog watertreatment system is discharging into the creek <br /> between the upstream and downstream water monitoring points. <br /> GROUND WATER QUALITY <br /> The results of monitoring wells D-1 A and D-2A which are located near the toe of the refuse <br /> pile are presented in Appendix II. Monitoring Well D-1 A is directly below the refuse pile <br /> and well D-2A is 200 feet to the west of well D-1 A. Monitoring results for prior years are <br /> summarized by quarter to make it comparable to the current monitoring schedule. <br /> Graphs have been prepared which show quarterly water level and conductivity <br /> • measurements for both wells. The water level measurements for the year were consistent <br /> with prior years data. The conductivity measurements in well D-1A were consistent with <br /> prior years. The conductivity measurements in well D-2A were lower than historic data. <br /> The pH measurements for the wells were similar to prior years monitoring. <br /> MINE FLOWS <br /> All of the water flowing into the No. 1 Mine flows out through the 6-inch PVC pipe. <br /> The No. 3 Mine, (Outfall 007), has two separate sources of discharge. One is from a point <br /> source (spring)within the mine that is piped directly to the surface. This good quality water <br /> was the source of the discharge from the No. 3 Mine, (Outfall 007), from 1986 through <br /> 1994. The water level in the mine fluctuated from 1986 through 1994 but no water <br /> discharged directly from the mine. During the second quarter of 1995, wet spring weather <br /> caused the mine to fill and begin discharging iron laden water. <br /> In order to treat this iron laden water, a 4-inch diameter PVC pipe was installed to convey <br /> the discharge from the No. 3 mine to the long pond located at the No. 1 Mine. The <br /> discharges from the mines were combined effective August 11, 1995. The combined <br /> discharge from the mines is treated by the passive water treatment system and is <br /> discharged through Outfall 001. <br /> • <br />