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• Analytical procedures <br /> • Chain-of-custody control <br /> sample Collection <br /> Sample collection procedures include equipment cleaning, water-level <br /> and total well depth measurement, well purging and sampling, and sam- <br /> ple preservation. <br /> Equipment Cleaning <br /> Prior to sample collection, all sample bottles, bottle caps, and septa <br /> for use in sampling of organics were thoroughly washed with detergent, <br /> rinsed extensively with tap water, and then rinsed again with high- <br /> purity deionized water. After washing and rinsing, the sample bottles <br /> and components were dried overnight at a temperature of 120•C. Sample <br /> bottles, bottle caps, and septa were protected from all forms of sol - <br /> vent contact between drying time and actual usage at the sample site. <br /> Plastic containers constructed of linear polyethylene were used for <br /> sampling inorganic parameters, including heavy metals. The plastic <br /> containers were sealed with polyethylene-lined polypropylene caps. <br /> The sample containers and components were used only once. <br /> Water-Level and Total Well Depth Measurements <br /> Immediately prior to well purging, the water level and total depth of <br /> the wells installed by EMCON were measured using an electric sounder. <br /> The electric sounder is a transistorized instrument that uses a reel- <br /> mounted, two conductor, coaxial cable that connects the control panel <br /> to the sensor. A low-current circuit is completed when the sensor <br /> makes contact with the water, which serves as an electrolyte. The <br /> current is amplified and fed into an indicator light and audible <br /> buzzer, thus signaling when water has been contacted. Cable markings <br /> are stamped at 1-foot, increments to facilitate depth control . Water <br /> PJ9 9390102.00D C-2 <br />