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4� <br /> h) <br /> el ' <br /> Field measurements were recorded in a waterproof field logbook. Figure A-2 shows an <br /> example of the Water Sample Field Data Sheet on which field data are recorded. Field data <br /> sheets were reviewed for completeness by the sampling coordinator after the sampling <br /> event was completed. <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 <br /> performance. Field meter calibrations were recorded on the Water Sample Field Data <br /> 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 100 milliliters per minute to minunize pump effluent turbulence and aeration. <br /> Glass bottles of at least 40 milliliters volume and fitted with Teflon-lined 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 eliminate 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«-ere 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 <br /> the 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 <br /> was sealed. Pressure was applied to the vessel with a hand pump and the filtrate directed <br /> into the 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 <br /> pump effluent line with a pressure fitting. As the pump cycled, the effluent was pressured <br /> through the filter and directed into the appropriate containers. Each filter was used once <br /> and discarded. <br /> SAC W�€'JZ,2520\25201000.1 PS-94\pas:1 A-4 Rev-0,4/11/95 <br />