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KLEINFELDER A-2.3 Collection of Soil Samples '- Soil samples are collected approximately every 5 or 10 feet for field screening, lithologic logging, and potential chemical analysis. Samples are collected by advancing the boring to �. a point immediately above the desired sampling depth and then driving (vertical borings) or pushing (slant borings) a Modified California Sampler, lined with three brass tubes, into the undisturbed soil. The sampler is then removed from the bottom of the boring. The ends of the bottom (third) tube are covered with Teflon and sealed with tight-fitting plastic caps. V After the samples are collected they are individually labelled. The label includes Kleinfelder's name,job number, the date and time the sample was collected, the employee number of the individual who performed the sampling, and a unique five-digit sample ,r identification number. A custody seal is also placed on the sample in such a way that any attempt to tamper with the sample is easily visible. An example of a sample label and custody seal are attached at the end of this appendix. A-2.4 Sample Handling After labeling, the sample is immediately stored in an iced cooler for transport to +r Kleinfelder's office sample control or to the analytical laboratory. A Kleinfelder chain-of- custody form is attached to the cooler. The chain-of-custody form includes Kleinfelder's name, address and telephone number, the employee number of the individual who performed the sampling, the sample numbers, the date and time the samples were collected, the number of containers each sample occupies, and the analyses for which the �. samples are being submitted, if any. The chain-of-custody form is signed by each person who handles the samples, including all Kleinfelder employees and the receiving employee of the analytical laboratory when the samples are delivered. An example of the chain-of- custody form is attached to this appendix. A-2.5 Soil Boring Closure and Soil Cutting Disposal Soil borings are closed immediately after the collection and logging of soil samples. Closure is accomplished by grouting the boring with a cement/bentonite slurry or as otherwise required. FR25-91-22 Page A-2 Copyright 1991 Kleinfelder,Inc.