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BURLINGTON <br /> L ENVIRONMENTAL ' <br /> A Phthp Environmental Company <br /> 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 transistorized instrument that uses a <br /> reel-mounted, two conductor, coaxial cable that connects the control panel to the sensor <br /> s An s rule is used r ' <br /> Cable markings are stamped at one-foot interval engineer 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, retneved, and inspected for PSH ' <br /> If PSH is encountered, its thickness is measured with an oillwater interface probe This <br /> instrument's dual-sensing probe utilizes an optical liquid sensor and electrical conductivity <br /> probe The instrument emits a steady tone when immersed in oil, and a broken tone when <br /> immersed in water If PSH greater than 1/32-inch in thickness is detected, a sample is not <br /> collected from that well <br /> All liquid measurements were recorded to the nearest 0 01 foot in the field logbook The <br /> groundwater elevation at each monitoring well was calculated by subtracting the measured ' <br /> depth to water from the surveyed well-casing elevation Total well depth was measured <br /> by lowering the sensor to the bottom of the well Total well depth, used to calculate ' <br /> purge volumes and to determine whether the well screen is partially obstructed by silt, was <br /> recorded to the nearest 0 1 foot in the field logbook ' <br /> I <br /> A-2 <br /> B'Crn1021102QR02 DOC <br />