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E� <br /> • <br /> Equipment Cleaning <br /> Sample bottles, caps, and septa used in sampling for volatile and semivolatile organics were <br /> triple rinsed with high-purity deionized water. After being rinsed, sample bottles were dried <br /> overnight at a temperature of 200°C. Sample caps and septa were dried overnight at a <br /> temperature of.60°C. Sample bottles, caps, and septa were protected from solvent contact <br /> between drying and actual use at the sapling site. Sampling containers were used only once <br /> and discarded after analysis was complete. <br /> Plastic bottles and caps used in sampling for metals were soaked overnight in a 1 percent <br /> nitric acid solution. Next, the bottles and caps were triple rinsed with deionized water. <br /> Finally, the bottles and caps were air dried before being used at the site. Plastic bottles and <br /> caps were constructed of linear polyethylene or polypropylene. Sampling containers were <br /> used only once and discarded after analysis was complete. <br /> Before the sampling event was begun, equipment that was to be placed in the well or <br /> would come in contact with groundwater was disassembled and cleaned thoroughly with <br /> detergent water, and then steam cleaned with deionized water. Any parts that could have <br /> absorbed contaminants, such as plastic pump valves, etc., were cleaned as described above, <br /> or replaced. if a positive displacement (bladder) pump is used the inside surfaces of the <br /> pump tubing were cleaned by heating the tubing overnight at 120°C with a low-flow, inert <br /> air source. <br /> Once the bladder pump was cleaned and reassembled, a pump blank was obtained by <br /> pumping organic-free water through the bladder pump assembly. The pump effluent was <br /> sampled and analyzed by EPA Method 601 or EPA Method 602. The pump effluent <br /> analysis results had to have registered below the method reporting limit for each parameter <br /> before the pump was taken to the site for use. <br /> During field sampling, equipment surfaces that were placed in the well or contacted <br /> groundwater were steam cleaned with deionized water before the next well was purged or <br /> sampled. <br /> Water Level, Floating Hydrocarbon, and Total Well Depth Measurements <br /> Before purging and sampling occurred, the depth to water, floating hydrocarbon thickness, and <br /> the total well depth were measured using an interface measuring system. The oil/water interface <br /> measuring system consisted of a probe that emitted a continuous audible tone when immersed in <br /> . a nonconductive fluid, such as oil or gasoline, and an inteffnittent tone when immersed in a <br /> SA(WNPJn52{n2520I(W.I PS-94\pas:I A-2 Rev.0,4/11/95 <br />