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0 1.2 Monitoring Information <br />The hydrologic monitoring parameters and the schedules for the hydrologic monitoring programs <br />are presented in Section 2. The monitoring sites, parameters and schedules have evolved over <br />time as the facility has evolved and changed. The current monitoring program was substantially <br />modified in 2001 per Permit Revision PR-04 and further modified in TR-47 in 2004. The <br />current monitoring program can be found in Exhibit 2.05-E7 - Hydrologic Monitoring Plan of <br />the CDRMS permit. <br />Field parameters for groundwater are depth to water level, pH, conductivity, and temperature. <br />Field parameters for surface water are flow, pH, conductivity, and temperature. Equipment and <br />methods used to measure the 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 Eutech Instruments pH Testr basic pocket-size tester is used to measure the pH of <br />a water sample. Published specifications for the pH Testr are range: pH - 0.0 to 14.0, <br />resolution: 0.1 pH, accuracy: +\- 0.1 pH, automatic temperature compensation, 3 point <br />calibration. The pH tester is calibrated prior to sampling events using the 2 point method. <br />The expected pH is bracketed by the pH of the calibration solutions. In most cases the <br />pH tester is calibrated to 7 and 10 which brackets all of the current monitoring results. If <br />an expected pH is less than 7, the pH tester can be calibrated at 4 and 7. <br />• • Conductivity - A Cole Parmer pocket-size TDS Testr 3 or TDS Testr 4 is used to measure <br />the conductivity of a water sample. Published specifications for the TDS Testr 3 are <br />range: 0 to 1990 uS, resolution 10 uS, accuracy: +\- 2% full scale, automatic temperature <br />compensation: 0 to 50 degrees C, calibration with standard solution. Published <br />specifications for the TDS Testr 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 <br />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 one of four different ways. The first method is to utilize <br />a known culvert size combined with the depth of flow and the velocity determined by <br />measuring the time it takes a floating object to travel a known distance or a flow meter. <br />The second method is to time flow into a bucket of known size. The third is to measure <br />the length, width, depth, and the velocity of a stream of water or sum the flows measured <br />in segments of a larger stream of water. The fourth way, used to find the flow of the <br />North Fork of the Gunnison and Hubbard Creek, is obtained from the nearby USGS <br />gauging station. <br />• Dissolved Oxygen - An EXTECH Model 407510 Dissolved Oxygen Meter is used to <br />measure dissolved oxygen with a remote sensor also containing a thermister for <br />measuring temperature. The DO range is 0.0 -19.9 mg/1 f 0.4 mg/1 with 0.1 mg/1 <br />resolution. Before use, the meter is calibrated according to the meter calibration <br />procedure. <br />Historically, water samples from groundwater wells H-10 and B-6 had been taken with a bailer <br />that had a restricted inlet. The bailer is weighted so it sinks to the bottom of the well when it is <br />2