SITE INFORMATION AND CORRESPONDENCE

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LK EWFELDER �Mlhl..,I..61h'Salutioni • TYPICAL KLEINFELDER FIELD PROTOCOL A-1 FIELD PREPARATION Before performing work in the field, environmental staffs review the scope of work, prepare a health and safety plan, coordinate the work to be done with their supervisor, assemble the necessary sample containers, and check, calibrate and clean equipment to be used in the field. When underground utilities may exist at a site where subsurface soil samples are being collected, USA Underground is contacted with the boring locations and the scheduled date of drilling, or a utility locating firm is employed to check the boring locations. A-2 SUBSURFACE SOIL SAMPLING A-2.1 Drilling Subsurface soil samples are collected from soil borings. Soil borings are advanced using a truck-mounted drill rig, equipped with 8-inch hollow stem augers. The borings • can be advanced vertically, or at an angle up to 45 degrees from vertical. During drilling, an experienced environmental geologist classifies the soil, logs the lithology and collects soil samples for laboratory analysis. A sample boring log form is attached at the end of this appendix. A-2.2 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. A-2.3 Collection of Soil Samples Soil samples are collected approximately every 5 feet for field screening, lithologic logging, and potential chemical analysis. 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 • 117226.E02/ST012RO696 Page A-1 September 14, 2012 Copyright 2012 Kleinfelder