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Methods <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 <br />temperature. Equipment and methods used to measure the field parameters include: <br />pH - A Cole Parmer pocket-size tester (pH Tester II). Range: -1.0 to 15.0 pH. <br />Resolution: 0.1 pH. Accuracy: ± 0.1 pH. Temperature compensation: automatic 0 to <br />50 °C. Calibration: 1, 2 or 3 point. <br />Conductivity -Two Cole Parmer pocket-size microprocessor-controlled testers <br />with different range capabilities (TDS Tester 10 and TDS Tester 20). Accuracy: ± 2% <br />FS. Temperature compensation: automatic 0 to 50 °C. Operating temperature: 0 to 50 <br />°C. Range: 0 to 1990 and 2,000 to 19,900 umhos/cm. <br />Salinity - A Yellow Springs Insturment (YSI) Model No. 33 is used to measure <br />salinity. <br />Depth to Water - A Water Level Indicator (M-Scope) is used to measure depth to <br />water. The cable is marked in 5-foot increments. A tape measure is used to determine <br />accurate distances between marked increments. <br />Temperature - A standard mercury thermometer which measures temperature in <br />degrees Celsius and a Cole Parmer microprocessor-controlled tester (Temptester). <br />Range: -28 to 150°C. Resolution: 1 °C. Accuracy: ± 1 % FS. <br />Dissolved oxygen - Horiba Model U-7, membrane type with automatic <br />temperature compensation 0 to 40 °C, galvanic cell 0 to 20 ppm ± 1.0 ppm. <br />The electronic water monitoring instruments may vary. However, the stated <br />accuracy of the instruments will be equal to or greater than that listed above. <br />The pH meter and the conductivity meter are calibrated prior to all sampling <br />events. The pH meter is calibrated using the 2 point method. The expected pH is <br />bracketed by the pH of the calibration solution. In most cases the pH meter will be <br />calibrated at 7 and 10 which will bracket all of the current monitoring results. If an <br />expected pH is less than 7, the pH meter will be calibrated at 4 and 7. <br />Flow -One of two methods, 1) time flow into a container of known size and 2) <br />utilize a portable 60° V-Notch weir. <br />Water samples are typically analyzed by ACZ Laboratories, Inc. of Steamboat <br />Springs, Colorado and Enviro-Chem of Grand Junction, CO. <br />-8- <br />