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WATER-LEVEL, PHASE SEPARATED HYDROCARBON, AND TOTAL <br /> WELL-DEPTH MEASUREMENTS <br />' Before purging and sampling, the depth to water, phase separated hydrocarbon (PSH) <br /> thickness, and the total well depth were measured using an electric sounder, a <br /> bottom-filling clear LuciteTM bailer, and/or an oil/water interface probe The electric <br /> sounder, manufactured by Slope-Indicator, Inc , is a transistonzed instrument that uses a <br /> reel-mounted, two conductor, coaxial cable that connects the control panel to the sensor <br /> Cable markings are stamped at one-foot intervals An engineer's rule is used to measure <br /> the depths to the nearest 0 01 foot The water level is measured by lowering the sensor <br /> into the monitoring well A low current circuit is completed when the sensor contacts the <br /> water, which serves as a conductor The current is amplified and fed across an indicator <br />' light and audible buzzer, signaling contact with water A sensitivity control compensates <br /> for very saline or conductive water After the water level is determined, a bailer is <br />' lowered to a point just below the liquid level, retrieved, and inspected for PSH <br /> If PSH is encountered, its thickness is measured with an oil/water interface probe This <br /> instrument's dual-sensing probe utilizes an optical liquid sensor and electrical <br /> conductivity probe The instrument emits a steady tone when immersed in oil, and a <br /> broken tone when immersed in water If PSH greater than 1/32-inch in thickness is <br /> detected, a sample is not collected from that well <br />' All liquid measurements were recorded to the nearest 0 01 foot in the field logbook The <br /> q g <br />' groundwater elevation at each monitoring well was calculated by subtracting the <br /> measured depth to water from the surveyed well-casing elevation Total well depth was <br /> measured by lowering the sensor to the bottom of the well Total well depth, used to <br />'1 calculate purge volumes and to determine whether the well screen is partially obstructed <br /> by silt, was recorded to the nearest 0 1 foot in the field logbook <br /> 1 <br /> A-2 <br /> B ICTI1021102QR02 DOC <br /> 1 <br />