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zTr <br />f -I <br />•0 <br />ATTACHMENT I <br />SOILS SAMPLING AND ANALYSES PROCEDURE <br />Two-inch diameter by six-inch long brass tubes in a split -barrel sampler <br />are used for all soils sampling. Soils descriptions and field analyses <br />are conducted using the middle tube from the sampler. If there is no <br />indication of contamination, the soils from the deepest tube are trans- <br />ferred to a plastic snap cap jar and stored as a record of the soils <br />present at the site. Unless otherwise requested, soils samples are dis- <br />carded after 60 days. <br />IT uses a combustible gas detector to determine in the field if the <br />Soils are contaminated. A Gastech, Inc., Model GX-3A, calibrated using <br />toluene, is the instrument used in this test. Soil samples from the <br />middle brass tube are placed in a glass jar and shaken to loosen the <br />soil. The cap on the jar is fitted with two tubes to allow air to pass <br />through the soil and into the GX-3A meter. Any sample that exceeds 10 <br />percent of the lower explosive limit (LEL) is sent to the laboratory for <br />analyses by EPA Method 8020. If it is determined that a sample is to be <br />sent to the laboratory, the undisturbed deepest brass tube is sealed and <br />shipped in a glass jar sealed with a teflon lid under refrigeration to <br />minimize the loss of volatiles. <br />Chain -of -custody farms and labels are used throughout the program to <br />assure that proper sample handling and tracking is maintained. <br />1 <br />