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KLEINFELDER <br /> A-3 3 COLLECTION OF SOIL SAMPLES <br /> Soil samples are collected approximately every 5 feet for field screening and logging Samples <br /> are collected by advancing the boring to a point immediately above the desired sampling depth <br /> and then driving (vertical borings) or pushing (slant borings) a Modified California Sampler, <br /> lined with three brass tubes, into the undisturbed soil The sampler is then removed from the <br /> bottom of the boring The ends of the bottom (third) tube are covered with Teflon and sealed <br /> with tight fitting plastic caps <br /> Each sample is individually labeled The label includes Klemfelder's name,fob 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 A custody seal may be placed <br /> on the sample in such a way that any attempt to tamper with the sample is easily visible <br /> A-3 4 SAMPLE HANDLING <br />■ After labeling, the sample is immediately stored in an iced cooler for transport to KIeinfelder' <br /> p s <br /> office sample control or to the analytical laboratory A Kleinfelder chain-of-custody form <br /> accompanies the cooler The cham-of custod form includes Klein <br /> y fielders 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, and the analyses for which the samples are being submitted, if any The chain- <br /> of-custody form is signed by each person who handles the samples, including all Kleinfelder <br /> employees and the receiving employee of office sample control or the analytical laboratory when <br /> the samples are delivered <br /> A-3 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 /> trisodium-phosphate wash and rinsed with distilled water prior to collecting each soil sample <br /> 23-482276-BOO/CR96S276 A -4 October 17, 1996 <br /> Copyright 1996 Kleinfelder,Inc <br />