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• <br /> inverted and tapped to verify that it contained no air bubbles The sample containers for <br /> other parameters were filled, filtered as required, and capped <br /> When required, dissolved concentrations of metals were determined using appropriate <br /> field filtration techniques The sample was filtered by emptying the contents of the Teflon <br /> bailer into a pressure transfer vessel. A disposable 0 45-micron acrylic copolymer filter <br /> was threaded onto the transfer vessel at the discharge point, and the vessel was sealed <br /> 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 /> Sample Preservation and Handling <br /> The following section specifies sample containers, preservation methods, and sample <br /> handling procedures <br /> Sample Containers and Preservation <br /> Sample containers vary with each type of analytical parameter Container types and <br /> materials were selected to be nonreactive with the particular analytical parameter tested <br />• <br /> Sample Handling <br /> Sample containers were labeled immediately prior to sample collection Samples were <br /> kept cool with cold packs until received by the laboratory At the time of sampling, each <br /> sample was logged on an ARCO chain-of-custody record that accompanied the sample to <br /> the laboratory <br /> Samples that required overnight storage prior to shipping to the laboratory were kept cool <br /> (4'C) 1n a refrigerator The refrigerator was kept 1n a warehouse, which was locked when <br /> not occupied by an IT employee A sample/refrigerator log was kept to record the date and <br /> time that samples were placed into and removed from the refrigerator <br /> Samples were transferred from IT to an ARCO-approved laboratory by courier or taken <br /> directly to the laboratory by the environmental sampler Sample shipments from IT to <br /> laboratories performing the selected analyses routinely occurred within 24 hours of sample <br /> collection <br />• <br /> CP'W 1CamPk\DataWrcluvelgrco105481Qtrly10548Q10o DOC-981st 1 A-4 IT Corporation <br /> 05/05/00 <br />