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1 MINREC, INC. ANNUAL HYDROLOGIC REPORT PAGE 2 Conductivity - Two Cole Parmer pocket size testers with different range capabilities. Accuracy: +/- 2$ FS. Temperature compensation: ' automatic 0 to 50 °C. Operating temperature: 0 to 50 °C. Range: 0 to 1990 and 0 to 19,900 umhos/cm. ' Depth to Water - A Water Level Indicator (M-Scope) is used to measure depth to water. The cable is marked in 5-foot increments. ' A tape marked measure is used increments. The to determine accurate water level in the No. distances between 3 Mine is measured through a pipe that was used to discharge water from the mine when the mine was in operation. Temperature - A standard mercury thermometer which measures temperature in degrees Celsius or a Cole Parmer microprocessor based pocket sized temperature tester is used. ' Other parameters - Samples are submitted in bottles to either Grand Junction Laboratories or SOLTESCO. ' 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-lA and D-2A which are located ' near the toe of the refuse pile are presented in Appendix II. D-lA is directly below the refuse pile and D-2A is 200 feet to the west of D-lA. 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 1