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� <br /> The pH, specific conductance, and temperature meter were calibrated each day before field <br /> activities were begun The calibration was checked once each day to verify meter performance <br /> Field meter calibrations were recorded on the Water Sample Field Data Sheet <br /> Well Sampling <br /> A Teflon bailer or bladder pump were the only equipment acceptable for well sampling When <br /> samples for volatile organic analysis were being collected, the pump flow was regulated at <br /> approximately 104 milliliters per minute to minimize pump effluent turbulence and aeration <br /> Glass bottles of at least 40 milliliters volume and fitted with Teflon-lured septa were used in <br /> sampling for volatile organics These bottles were filled completely to prevent air from <br /> remaining in the bottle A positive meniscus formed when the bottle was completely full. A <br /> convex Teflon septum was placed over the positive meniscus to ehminate air After the bottle <br /> was capped, it was inverted and tapped to verify that it contained no air bubbles The sample <br /> containers for other parameters were filled, filtered as required, and capped <br /> When required, dissolved concentrations of metals were determined using appropriate field <br /> filtration techniques When a Teflon bailer was used, the sample was filtered by emptying the <br /> contents of the bailer into a pressure transfer vessel. A disposable 0 45-micron acrylic <br /> copolymer filter was threaded onto the transfer vessel at the discharge point, and the vessel was <br /> sealed Pressure was applied to the vessel with a hand pump and the filtrate directed into the <br /> appropriate containers Each filter was used once and discarded <br /> When a bladder pump was used to collect samples for dissolved constituents, filtering was <br /> performed by attaching a disposable 0 45-micron acrylic copolymer filter directly to the pump <br /> effluent line with a pressure fitting As the pump cycled, the effluent was pressured through the <br /> filter and directed into the appropriate containers Each filter was used once and discarded <br /> SAMPLE PRESERVATION AND HANDLING <br /> The following section specifies sample containers, preservation methods, and sample handling <br /> procedures <br /> Sample Containers and Preservation _ <br /> Sample containers vary with each type of analytical parameter Container types and materials <br /> were selected to be nonreactive with the particular analytical parameter tested <br /> SA(W\P72\2520`25201000 IGS 94\pas 1 <br />