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k` ■ KLEINFELDER <br /> B-2.3 Collection of Soil Samples <br /> Soil samples are collected approximately every 5 to 10 feet for field screening and logging. <br /> Samples are collected by advancing the boring to a point immediately above the desired <br /> sampling depth and then driving (vertical borings) or pushing (slant borings) a 2-inch diameter <br /> Modified California Split-Spoon Sampler, lined with three 6-inch long brass tubes, into the <br /> undisturbed soil. The sampler is then removed from the bottom of the boring. The ends of the <br /> bottom (third) tube are covered with Teflon and sealed with tight fitting plastic caps. <br /> Each sample is individually labeled. The label includes Kleinfelder's name,job number, the date <br /> and time the sample was collected, the employee number of the individual who performed the <br /> sampling, and a unique five-digit sample identification number. <br /> B-2.4 Sample Handling <br /> After labeling, the sample is immediately stored in an iced cooler for transport to Kleinfelder's <br /> office sample control or to the analytical laboratory. A Kleinfelder chain-of-custody form <br /> accompanies the cooler. The chain-of-custody form includes Kleinfelder's name, address and <br /> telephone number, the employee number of the individual who performed the sampling, the <br /> sample numbers, the date and time the samples were collected, the number of containers each <br /> sample occupies, the sample matrix (soil or water) and the analyses for which the samples are <br /> being submitted, if any. The chain-of-custody form is signed by each person who handles the <br /> samples, including all Kleinfelder employees and the receiving employee of office sample <br /> control or the analytical laboratory when the samples are delivered. <br /> B-2.5 Decontamination of Equipment <br /> To reduce the potential for cross-contamination, augers and associated equipment are steam <br /> cleaned prior to drilling each boring. In addition, sampling equipment is cleaned with a <br /> trisodiu►n phosphate or non-phosphate detergent wash and rinsed with distilled water prior to <br /> collecting each soil sample. <br /> B-2.6 Soil Boring Closure and Cutting Disposal <br /> Soil borings are closed immediately after the collection and logging of soil samples. Closure is <br /> accomplished by grouting the boring with a cement/bentonite slurry or as otherwise required. <br /> Drill cuttings will be placed in 55-gallon drums wrapped in plastic or spread around the boring <br /> and left on site for disposal by the site owner. If requested, Kleinfelder can coordinate disposal <br /> of soil and water after analytical results are available. <br /> 20-3712-08.E01/2018P098 Page B-2 <br /> © 1998 Kleinfelder, Inc. April 8, 1998 <br />