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Sample Containers <br />Sample containers vary with each type of analytical parameter. Selected <br />container types and materials are non-reactive with the sample and the <br />particular analytical parameter being tested. Appropriate containers for <br />volatile organics are glass_ bottles of at least 40 milliliters in size fitted with <br />teflon -faced silicon septa. Sample containers are properly cleaned and <br />sterilized by the certified laboratory according to the EPA protocol for the <br />individual analysis. <br />Sample Preservation and Shipment <br />Various preservatives are used by the certified laboratory to retard changes in <br />samples. Sample shipment from Ensco Environmental Services to laboratories <br />performing the selected analyses routinely occurs within 24 hours of sample <br />collection. <br />Analytical Procedures <br />The analysis of ground water samples is conducted in accordance with accepted <br />quantitative analytical procedures. The following four publications are <br />considered the primary references for ground water sample analysis, and the <br />contracts with the laboratories analyzing the samples stipulate that the <br />methods set out in these publications be used. Please note that procedures <br />used are periodically updated by federal and state agencies, and the certified <br />laboratories amend analysis as required by the update. <br />• Standard Methods for the Examination of Water and Wastewater. 16th <br />Ed., American Public Health Association, et al., 1985. <br />• Methods for Chemical Analysis of Water and Wastes, U.S. EPA, 600/4- <br />79-020, March 1979. <br />ENSCO ENVIRONMENTAL SERVICES, INC. <br />Laboratory Procedures <br />Latest Revision: April 5, 1988 <br />