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• kn KLEINFELDER A-3.3 COLLECTION OF SOIL SAMPLES Soil samples are collected approximately every 5 feet for field screening and logging. 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. Each sample is individually labeled. 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 identification number. A custody seal may be placed on the sample in such a way that any attempt to tamper with the sample is easily visible. ' A-3.4 SAMPLE HANDLING After labeling, the sample is immediately stored in an iced cooler for transport to Kleinfelder's ' office sample control or to the analytical laboratory. A Kleinfelder chain-of-custody form accompanies 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 office sample control or the analytical laboratory when ' the samples are delivered. A-3.5 DECONTAMINATION OF EQUIPMENT To reduce the potential for cross-contamination, augers and associated equipment are steam cleaned prior to drilling each boring. In addition, sampling equipment is cleaned with a ' trisodium-phosphate wash and rinsed with distilled water prior to collecting each soil sample. 23-482276-B00/CR96S070 A-4 June 26 1996 Copyright 1996 Kleinfelder,Inc.