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<br />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 temperature. <br />Equipment and methods used to measure the field parameters include: <br />pH - A Cole Parmer pocket-size tester (pH Tester II). Range: -I.0 to 15.0 pH. <br />Resolution: 0.1 pH. Accuracy: t 0.1 pH. Temperature compensation: automatic 0 to 50 °C. <br />Calibration: 1, 2 or 3 point. <br />Conductivity -Two Cole Parmer pocket-size microprocessor-controlled testers with <br />different range capabilities (TDS Tester 10 and TDS Tester 20). Accuracy: t 2% FS. <br />Temperature compensation: automatic 0 to 50 °C. Operating temperature: 0 to 50 °C. Range: 0 <br />to 1990 and 2,000 to 19,900 umhos/cm. <br />Salinity - A Yellow Springs Insturment (YSI) Model No. 33 is used to measure salinity. <br />Depth to Water - A Water Level Indicator (M-Scope) is used to measure depth to water. <br />The cable is marked in 5-foot increments. A tape measure is used to determine accurate distances <br />between marked increments. <br />Temperature - A standard mercury thermometer which measures temperature in degrees <br />Celsius and a Cole Parmer microprocessor-controlled tester (Temptester). Range: -28 to 150°C. <br />Resolution: 1°C. Accuracy: f 1%FS. <br />Dissolved oxygen - Horiba Model U-7, membrane type with automatic temperature <br />compensation 0 to 40 °C, galvanic cell 0 to 20 ppm f 1.0 ppm. <br />The electronic water monitoring instruments may vary. However, the stated accuracy of <br />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 events. The <br />pH meter is calibrated using the 2 point method. The expected pH is bracketed by the pH of the <br />calibration solution. In most cases the pH meter will be calibrated at 7 and ]0 which will bracket <br />all of the current 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 2) utilize a <br />portable 60° V-Notch weir. <br />Water samples are typically analyzed by ACZ Laboratories, Inc. of Steamboat Springs, <br />Colorado. <br />• <br />_12_ <br />