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L . k4KLEIfVF1= LIBER A-2.3 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 tribes, into the undisturbed soil. The sampler is then removed from the bottom of the boring. "I-lie ends of the bottom (third) t6be erre covered with 7'ellon and sealed with tight fitting plastic caps. Each sample is individually labeled. ]'lie 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 sea] may be placed on the sample in such a way that any attempt to tamper with the sample is easily visible. 1 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 K.lein:felder's :name, address, and telephone number, the employee number of the individual who performed the sampling, the sarrnple numbers, the date and time the samples were collected, the number of containers each sarriple occupies, and the analyses for which the samples are being submitted, if any. When the samples are delivered, the chain-ot'custody form is signed by each pc-.rsorr who handles the samples, including all K'lei nfclder employees and the receiving employee of office sample control or the analytical laboratory. A-2.5 Decontamination of IJquilMICIlt To reduce the potential ,For cross-contanninati 011, augers and associated equipment are steam cleaned prior to drilling each boring. In addition, sampling equipment is cleaned with a trisodium-phosphate or laboratory detergent wash and rinsed with distilled water prior to collecting each soil sample. A-2.6 Soil Cutting Disposal Drill cuttings are placed in 55-2gallon dnlms 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. 20-Y P8-124/201 SP 141/20 1 SC270 Page A-2 © 1998. hleinickla. inc. .fuue Ih. 1998