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