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Sanborn Creek Mine 1995 Annual Hydrologic Report Monitoring The hydrologic monitoring parameters and the schedules for the hydrologic monitoring program are presented in Appendix 1. The parameters and schedule were changed during 1994 by Technical Revision No. 20. Field parameters for groundwater are depth to water level, pH, conductivity, and temperature. Field parameters for surface water are flow, pH, conductivity, and temperature. Equipment and methods used to measure the field parameters include: Depth to water level - A cable marked in increments is lowered into the groundwater monitoring well until electrical continuity is reached at the water surface. A tape measure is used to determine distances between marked increments. pH - A Cole Parmer pHTestr 2 pocket-size tester is used to measure the pH of a water sample. Published specifications for the pHTestr 2 are range: pH -1.0 to 15.0, resolution: 0.1 pH, accuracy: +/- 0.1 pH, automatic temperature compensation: 0 to 50 degrees C, calibration points: 1, 2, or 3. The pH tester was calibrated prior to sampling events using the 2 point method. The expected pH was bracketed by the pH of the calibration solutions. In most cases the pH tester was calibrated at 7 and 10 which brackets all of the • current monitoring results. If an expected pH is less than 7, the pH tester will be calibrated at 4 and 7. Conductivity - Two Cole Parmer pocket-size testers with different range capabilities are used to measure the conductivity of a water sample. Published specifications for the TDSTestr 3 are range: 0 to 1990 u5, resolution: 10 uS, accuracy: +/- 2$ full scale, automatic temperature compensation: 0 to 50 degrees C, calibration with standard solution. Published specifications for the TDSTestr 4 are range: 0 to 19.90 mS, resolution: 0.1 mS, accuracy: +/- 2$ full scale, automatic temperature compensation: 0 to 50 degrees C, calibration with standard solution. A single Cole Parmer TDSTestr 20 pocket-size tester with dual range capabilities may be substituted for the TDSTestr 3 and/or the TDSTestr 4. Published specifications for the TDSTestr 20 are range: 0 to 1990 uS with resolution 10 u5 and 2.0 to 19.90 m5 with resolution 0.1 mS, accuracy: +/- 2$ full scale, automatic temperature compensation: 0 to 50 degrees C, calibration with standard solutions. The conductivity testers were calibrated prior to sampling events with calibration solutions in the expected range. Temperature - A standard mercury thermometer which measures temperature in degrees Celsius is used. Flow - One of two methods is used to determine the flow at the 2 C~