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was calibrated each day prior to initiating field activities. The calibration was checked once during each day of sampling to verify meter performance. After the calculated purge volume had been removed and the tempera- ture, pH, and electrical conductivity had stabilized, samples were collected. With as little interruption as possible, the bladder pump was activated and effluent was directed into the appropriate contain- ers. When collecting samples to be analyzed for volatile organics, care was taken to prevent the force of the sample stream from intro- ducing air bubbles into the sample. After capping, the bottle was inverted and tapped to confirm that no air was present in the bottle. All samples for organics analysis were collected in duplicate. The sample containers for other parameters were filled, filtered and/or preserved as required, and capped. 9 Appropriate field filtration techniques were implemented when collect- ing samples intended for dissolved compound analyses. The samples were filtered by attaching a high volume, 0.45-micron filter to the pump effluent line with a pressure fitting. As the bladder pump cycled, the effluent was passed through the filter and directed into appropriate containers. Filters were discarded after each use. The ground-water parameters that were filtered are presented below: Arsenic Copper Sodium Barium Iron Selenium Cadmium Lead Silver Calcium Magnesium Zinc Chromium Manganese All samples were labeled upon sampling and then immediately placed on ice. Samples were cooled to 4°C with cold packs until received by the laboratory. At the time of sampling, the sample was logged onto a chain-of-custody form, which accompanied the sample to the laboratory. PJ9 9390102.000 - C4