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t N KLEIN FELDER File No. 20-3769-01 March 16, 1994 bottom of the boring. The ends of the bottom (third) tube are covered with Teflon and sealed with tight fitting plastic caps. 1 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 KIeinfelder'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 dnlling each boring. In addition, sampling equipment is cleaned with a tnsodium-phosphate or laboratory detergent wash and rinsed with distilled water prior to collecting each soil sample. A-2.6 Soil Cutting Disposal Dnll 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 GROUNDWATER WELL INSTALLATION A-3.1 Monitoring Well Construction Construction details for shallow groundwater monitoring wells are as follows • The monitoring wells will have casings consisting of 2-inch inside diameter, flush- threaded point, Schedule 40 PVC pipe. These wells will be constructed in 8-inch diameter borings. Copyright 1994 Klainfalder, Inc Page 2 of 3