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Well Sampling A Teflon® bailer or bladder pump will he the only equipment acceptable for well sampling. When collecting samples for volatile organic analysis with a bladder pump, the pump flow will be re<Llulated to approximately 100 milliliters per minute to minimize pump effluent turbulence and aeration. Glass bottles of at least 40 milliliters volume and fitted with Teflon@-lined septa will be used in sampling for volatile organics. These bottles will be filled completely to prevent air from remaining in the bottle. A positive meniscus forms when the bottle is completely full. A convex Teflon@ septum is placed over the positive meniscus to eliminate air. After capping, the bottle is inverted and tapped to verify that it contains no air bubbles. The sample containers for other parameters will be filled, filtered as required, and capped. Sample Containers and Preservation Sample containers vary with each type of analvtical parameter. Container types and materials will be selected to be nonreactive with the p:arlicular analytical parameter tested. Sample Handling All sample containers will be labeled immediately following collection. Samples will be kept cool with cold packs until received by the laboratory. Cold packs will be replaced each day to maintain refrigeration. At the time of sampling, each sample will be logged on a chain of custody record that will :accompany the sample to the laboratory. The sampling team transfers all samples from the site to EMCON's laboratory by the sampling team. When EMCON laboratory personnel receive the sample. they will assign a unique sample identification number will be :ussi�ulned to each sample container. This number will be recorded on the chain of custody form and Nviil be used to identifv the sample in all subsequent internal chain of custody and analytical records. Samples are routinely shipped from EMCON to laboratories performing the selected analyses within 24 hours after samples are received. EMCON's laboratory_ manager will ensure that the holding times for requested analyses are not exceeded. Sample Documentation The following procedures will be used dur-in1 ,:unpllng, :and analysis to provide chain of custody control during sample handling from collection throu(-,h storage. Sample documentation will include the use of the followin�12: v • Field logbooks to document sampling activities in the field • Labels to identify individual samples • Chain of custody record sheets for documenting possession and transfer of samples FRE/Sample.arc-93/jes:0 A-4 Rev.0,06(21/95