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1 i <br /> Water-level, Floating Hydrocarbon, and Total Well-depth Measurements <br /> Floating hydrocarbon is not expected as it has not been reported in upgradient test <br /> wells Before purging and sampling occurs, liquid levels will be recorded relative to <br /> the groundwater surface A bottom-filling, clear Teflon® bailer may r-:� used to <br /> record floating hydrocarbon thickness and depth to water <br /> The electric sounder is a transistonzed instrument that uses a reel-mounted, two- <br /> conductor, coaxial cable that connects the control panel to the sensor Cable <br /> ' markings are stamped at 1-foot intervals The water level will be measured by <br /> lowering the sensor into the monitoring well A low-current circuit is completed <br /> when the sensor contacts the water, which serves as an electrolyte The current is <br /> ' amplified and fed into an indicator light and audible buzzer, signaling v.'h :n water <br /> has been contacted A sensitivity control compensates for highly saline or <br /> conductive water The electric sounder will be decontaminated by being j-)l lsed with <br /> deionized water after each use The bailer will be lowered to a point just below the <br /> liquid level, retrieved, and observed for floating hydrocarbon <br /> Liquid measurements will be recorded to the nearest 0 01 foot in the lied logbook <br /> The groundwater elevation at each monitoring well will be calculated by su,otracting <br /> the measured depth to water from the surveyed elevation of the top w Ene well <br /> casing (Every attempt will be made to measure depth to water for all _pis on the <br /> same day ) <br /> ' In the event of shallow wells where water surface is visibie, direct mec asuremerit <br /> using a clean tape measure may be employed Well purging will be carried out <br /> prior to sampling for contamination <br /> 1 <br /> C- 3 <br />