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KEI-P91-0202 .P3 October 16, 1991 Page 2 a significant clay aquitard (less than or equal to 5 feet in thickness) is encountered first, at which time drilling will be terminated. Based on our present knowledge of the site, it is anticipated that the proposed wells will be installed to a depth of approximately 82 to 86 feet below grade. The exploratory borings will be drilled and sampled to a maximum depth of about 15 to 20 feet below grade. 2 . Soil samples will be collected at a maximum spacing of 5 foot intervals, at significant changes in lithology, at obvious areas of contamination, and at/or within the soil/ground water interface, beginning at a depth of about 4 to 5 feet below grade. Sampling for laboratory analyses and lithologic logging purposes will continue until the first water table is encountered (except for the exploratory borings, which will only be drilled and sampled to maximum depths of about 15 to 20 feet) . Sampling for lithologic logging purposes only will continue below the water table to the total depth drilled. A • representative soil sample of the saturated zone will be collected and submitted to a laboratory for a particle size analysis (sieve and hydrometer analysis) for verification of casing slot size and filter pack design. Classification of soil will be done using the Unified Soils Classification System (USCS) by KEI 's field engineer or geologist. For the proposed monitoring wells, samples will be collected in a California modified split-spoon sampler with two-inch diameter brass liners. The sampler will be advanced ahead of the drilling augers at designated depths by dropping a 140 pound hammer 30 inches. Blow counts will be recorded. Samples will be removed from the sampler and retained in brass liners. The liners will be sealed with aluminum foil, plastic caps and tape. They will be labeled and stored on crushed ice or "blue ice" for delivery to a state certified laboratory. For the two proposed exploratory borings, soil samples will be collected at approximate continuous intervals using a hydrau- lically-driven, split spoon sampler lined with approximately one-inch diameter brass liners. The liners will be sealed and stored in a cooled ice chest as discussed above. 3 . During drilling operations, all soil materials will be stored on-site in either DOT-approved 55 gallon drums or on visqueen. Each drum, if used, will be properly labeled and will include, at a minimum, the date, interval that soil materials were . obtained from, a contact individual, and a phone number at KEI.