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1 <br />' 1.2 Monitoring Inforn~ation <br />' The hydrology monitoring parameters and [he schedules for the hydrology monitoring <br />' programs are presented in section 2. The parameters and schedule were changed in 1994 by <br />Technical Revision No. 20. <br />' Field parameters for groundwater are depth to water level, pH, conductivity, and <br />temperature. Field parameters for surface water are flow, pH, conductivity, and temperature. <br />Equipment and methods used to measure [he field parameters include: <br />' Depth to water level - A cable marked in increments is lowered into the groundwater <br />monitoring well until electrical continuity is reached at the water surface. <br />pH - A Cole Parmer pHTestr 2 pocket-size tester is used to measure the pH of a water <br />' sample. Published specifications for the pHTestr 2 are range: pH - 1.0 to 15.0, resolution: 1.0 <br />pH, accuracy: +\- 0.1 pH, automatic temperature compensation: 0 to 50 degrees C, calibration <br />points 1, 2, or 3. The pH tester was calibrated prior to sampling events using the 2 point method. <br />' The expected pH was bracketed by the pH of the calibration solutions. In most cases the pH <br />tester was calibrated to 7 and 10 which brackets all of the current monitoring results. If an <br />expected pH is less than 7, the pH tester will be calibrated at 4 and 7. <br />' Conductivity - A Cole Parmer pocket-size TDSTestr 20 with dual range capabilities is <br />used to measure the conductivity of a water sample. Published specifications for the TDSTestr <br />20 are range 0 to 1990uS with resolution 10 uS and 2.0 to 19.90 mS with resolution 0.1 mS, <br />' accuracy: +\- 2% full scale, automatic temperature compensation: 0 [0 50 degrees C, calibration <br />with standard solutions. The conductivity tester was calibrated prior to sampling events with <br />calibration solutions in [he expected range. The TDSTestr 3 and the TDSTestr 4 are used as a <br />back up to the TDSTestr 20. Published specifications for the TDSTestr 3 aze range: 0 to 1990 <br />uS, resolution 10 uS, accuracy: +\- 2% full scale, automatic temperature compensation: 0 to 50 <br />degrees C, calibration with standard solution. Published specifications for the TDSTestr 4 are <br />' range: 0 to 19.90 mS, resolution: 0.1 mS, accuracy: +\- 2% full scale, automatic temperature <br />compensation: 0 to 50 degrees C, calibration with standard solution. <br />Temperature - A standard mercury thermometer that measures temperature in degrees <br />' Celsius is used. <br />Flow -The flow is measured in four different ways. The first method is to utilize a <br />' known culvert size combined with the depth of flow and the velocity determined by measuring <br />the time it takes a floating object to travel a known distance. The second method is to time flow <br />into a bucket of known size. 'The third is to measure the length, width, depth, and the velocity of <br />' a stream of water. The fourth way, used to find the flow of the North Fork of the Gunnison, is <br />obtained from the nearby USGS gauging station. <br />' Water samples from groundwater wells H-10 and B-6 are taken with a bailer that has a <br />restricted inlet. The bailer is weighted so it sinks to the bottom of the well when it is empty. The <br />water flows into the bailer slowly so a sample of the water from the bottom of the well is <br />' obtained. It is no[ possible to purge wells H-10 and B-6 because they are connected to the <br />flooded mine workings. Water samples from groundwater wells SC-1, SG2, and SC-3 are <br />obtained with a bailer after the wells have been bailed to remove the equivalent of one volume of <br />' water from the wells. <br /> <br />