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• 2.05.6 <br />Field parameters for groundwater are depth to water level, pH, conductivity <br />and temperature. Field parameters for surface water are flow, pH, <br />conductivity and temperature. Equipment and methods used to measure the <br />field parameters include: <br />pH - A Cole Parmer pocket-size tester (pH Tester II). Range: -1.0 to 15.0 <br />pH. Resolution: 0.1 pH. Accuracy: ± 0.1 pH. Temperature compensation: <br />automatic 0 to 50 °C. Calibration: 1, 2 or 3 point. <br />Conductivity -Two Cole Parmer pocket-sizemicroprocessor-controlled <br />testers with different range capabilities (TDS Tester 10 and TDS Tester 20). <br />Accuracy: ± 2% FS. Temperature compensation: automatic 0 to 50 °C. <br />Operating temperature: 0 to 50 °C. Range: 0 to 1990 and 2,000 to 19,900 <br />umhos/cm. <br />Depth to Water - A Water Level Indicator (M-Scope) is used to measure <br />depth to water. The cable is marked in 5-foot increments. A tape measure <br />is used to determine accurate distances between marked increments. <br />• Temperature - A standard mercury thermometer which measures <br />temperature in degrees Celsius and a Cole Parmer microprocessor- <br />controlled tester (Temptester). Range: -28 to 150°C. Resolution: 1°C. <br />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 t 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 <br />pH is bracketed by the pH of the calibration solution. In most cases the pH <br />meter will be calibrated at 7 and 10 which will bracket all of the current <br />monitoring results. If an expected pH is less than 7, the pH meter will be <br />calibrated at 4 and 7. <br />Flow -One of two methods, 1)time flow into a container of known size and <br />• 2) utilize a portable 60° V-Notch weir. <br />PR-04 2.05 - 82 - 01/01 <br />