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4. KLEINFELDER 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-2.4 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 When the samples are delivered, 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 A-2.5 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 • tnsodium-phosphate or laboratory detergent wash and rinsed with distilled water pnor to collecting each soil sample A-2.6 Soil Cutting Disposal Drill cuttings are placed in 55-gallon drums or on top of and covered by polyvisquene for storage The soil is left on site for disposal by the site owner If requested, Kleinfelder can coordinate disposal of soil and water after analytical results are available A-3 C;ROUNDWATERT L A-3.1 Monitoring Well Construction Construction details for shallow groundwater momtonng wells are as follows * The monitoring wells will have casings consisting of 2-inch inside diameter, flush- threaded joint, Schedule 40 PVC pipe These wells will be constructed in 8-inch diameter bonngs • Well screen sections will be perforated with 0 010- or 0 020-inch factory-cut slots The . perforation sieve openings are assessed (and modified if required) after the bonngs are logged, and if warranted, a sieve test has been performed and the results received ETH and WC194 Copyright 1994 Kleinfelder Inc Page 2 of 5