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polyethylene. All sampling containers will be used only once and <br /> discarded after analysis is complete. <br /> When use of a positive displacement Teflon and stainless steel bladder <br /> pump is required, the pump is cleaned as described above and reassem- <br /> bled. Organic-free water is then pumped through to obtain a pump <br /> blank. The pump effluent is sampled and analyzed for the indicator <br /> compounds trichloroethylene, tetrachlorothylene, benzene, toluene, <br /> xylenes, and ethybenzenes; the results of the analysis must be below <br /> the instrument detection limit for each parameter before the pump is <br /> taken to the site for use. <br /> During field sampling, all equipment surfaces that have been placed in <br /> a well are cleaned before sampling subsequent wells. This cleaning is <br /> performed by steam cleaning the equipment with deionized water. <br /> ter-Lpyal and Well Total Dep b eas1rements <br /> Prior to purging and sampling, the water level in the well will be <br /> measured with an electric sounder. A reel-mounted, two-conductor, <br /> coaxial cable connects the control panel to the sensor. The water <br /> level is measured by lowering the sensor into the well . A low-current <br /> circuit is completed when the sensor makes contact with the water, <br /> which serves as an electrolyte. The current is amplified and fed into <br /> an indicator light and audible buzzer, thus signaling when water has <br /> been contacted. A sensitivity control compensates for very saline or <br /> conductive water. Cable markings are stamped at 1-foot increments for <br /> depth control . Depth to water measurements are recorded to the <br /> nearest 0.01 foot. Well total depth is measured by lower the probe to <br /> the bottom of the well . Well total depths are recorded to the nearest <br /> 0.5 foot. Before and after each use, the sounder will be decontami- <br /> nated by steam cleaning. <br /> PJ9 9390313.000 B-4 <br />