ARCHIVED REPORTS XR0001304 - Laserfiche WebLink

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r The pH, specific conductance, and temperature meter were calibrated each day before field activities were begun The calibration was checked once each day to verify meter performance Field meter cahbrations were recorded on the water sample field data sheet Well Sampling A Teflon bailer was the only equipment acceptable for well sampling When samples for volatile organic analysis were being collected, the flow of groundwater from the bailer was regulated to muumize turbulence and aeration Glass bottles of at least 40-rrulliliters volume and fitted with Teflon-lined septa were used in sampling for volatile organics These bottles were filled completely to prevent air from remaining in the bottle A positive meniscus formed when the bottle was completely full A convex Teflon septum was placed over the positive meniscus to eliminate air After the bottle was capped, it was inverted and tapped to verify that it contained no aur bubbles The sample containers for other parartneters were filled, filtered as required, and capped When required, dissolved concentrations of metals were determined using appropriate field filtration techniques The sample was filtered by emptying the contents of the Teflon bailer into a pressure transfer vessel A disposable 0 45-micron acrylic copolymer filter was threaded onto the transfer vessel at the discharge point, and the vessel was sealed Pressure was applied to the vessel with a hand pump and the filtrate directed into the appropriate containers Each filter was used once and discarded Sample Preservation and Handling The following section specifies sample containers, preservation methods, and sample handhng procedures Sample Containers and Preservation Sample containers vary with each type of analytical parameter Container types and materials were selected to be nonreactive with the particular analytical parameter tested Sample Handling Sample containers were labeled immediately prior to sample collection Samples were kept cool with cold packs until received by the laboratory At the time of sampling, each sample was logged on an ARCO chain-of-custody record that accompanied the sample to the laboratory Samples that required overnight storage prior to ,hipping to the laboratory were kept cool (4°C) in a refrigerator The refrigerator was kept in a warehouse, which was locked when not occupied SAGW\PJO\0805\08051460 7CS-96\cjb 1 $-5 Rev 0, 1025/96