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• 1.2 Monitoring <br />The hydrologic monitoring parameters and the schedules for the hydrologic <br />monitoring programs are presented in section 2. The parameters and schedule were changed <br />in 1994 by 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 the field parameters include: <br />Depth to water level - A cable mazked in increments is lowered into the groundwater <br />monitoring well until electrical continuity is reached at the water surface. A tape measure is <br />used to determine distances between marked increments. <br />pH - A Cole Pazmer 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 ] 5.0, 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 <br />method. The expected pH was bracketed by the pH of the calibration solutions. In most <br />cases the pH tester was calibrated to 7 and 10 which brackets all of the current monitoring <br />results. If an 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 <br />TDSTestr 20 are range 0 to 1990uS with resolution 10 uS and 2.0 to 19.90 mS with <br />resolution 0.1 mS, accuracy: +\- 2% full scale, automatic temperature compensation: 0 to 50 <br />degrees C, calibration with standard solutions. The conductivity tester was calibrated prior to <br />sampling events with calibration solutions in the expected range. The TDSTestr 3 and the <br />TDSTestr 4 are used as a back up to the TDSTestr 20. Published specifications for the <br />TDSTestr 3 are range: 0 to 1990 uS, resolution ] 0 uS, accuracy: +\- 2% full scale, automatic <br />temperature compensation: 0 to 50 degrees C, calibration with standard solution. Published <br />specifications for the TDSTestr 4 are range: 0 to 19.90 mS, resolution:0.1 mS, accuracy: +\- <br />2% full scale, automatic temperature compensation: 0 to 50 degrees C, calibration with <br />standard solution. <br />Temperature - A standard mercury thermometer which measures temperature in <br />degrees 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 <br />flow into a bucket of known size. The third is to measure the length, width, depth, and the <br />velocity of a stream of water. The fourth way, used to find the flow of the North Fork of the <br />Gunnison, is 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. <br />The water flows into the bailer slowly so a sample of the water from the bottom of the well is <br />obtained. It is not possible to purge wells H-10 and B-6 because they are connected to the <br />