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Geotechnical Engineering Services BSK Proposal No. 04-20-0117 Proposed Soil Management Cell February 12, 1996 Tracy Army Depot Page 2 DDRW-Tracy, California 2.1 Field Exploration Prior to mobilization, we would obtain the necessary drilling permit from San Joaquin County Environmental Health Department. We understand that Radian Corporation (Radian) will be responsible for utility clearance and the field marking of the borings. In order to assess the subsurface soil conditions, we plan to drill a total of three borings just outside of SWMU3 pond. Two 30-foot borings would be drilled at the east and west perimeters and one 15-foot boring would be advanced at the middle portion of south perimeter of the pond. We understand that Radian will provide us with existing lithologic logs of the shallow material within the pond area. Drilling would be performed using a truck-mounted drill rig equipped with hollow-stem augers. Attempts would be made to collect samples at 5-foot intervals with a split- barrel Modified California sampler housing stainless steel sample liners. The field exploration program would be performed under the technical direction of an engineer or geologist, who would also maintain a continuous log of the boring, obtain undisturbed and bulk soil samples, observe groundwater (if encountered) and other site conditions, and record sampler driving resistance. The soils would be generally classified according to the Unified Soil Classification System (ASTM D 2487). An Organic Vapor Meter (OVM) will be used for screening the soil samples and drill cuttings in the field for possible presence of hydrocarbon vapors. Measurement of groundwater level would be made during the drilling process and after drilling completion. The field operations (drilling, sampling, logging, and cleaning) would be performed by OSHA 40-Hour Hazardous Waste Operations and Emergency Response trained personnel. Prior to drilling each boring, augers would be steam cleaned. Rinse waters would be retained and transferred to a 55-gallon DOT E/H drum. Between soil-sampling attempts, soil samplers would be disassembled and washed in a solution of laboratory-grade detergent, rinsed with clean water, and reassembled with clean sample liners to minimize the potential of spreading possible contaminants among samples. Auger cuttings generated during the drilling, would be stored on- site in drums. Wastewater, including water generated during the decontamination of drill equipment, would be stored on-site in drums. Disposal of these drums is not included in the scope of our services. At the completion of drilling and sampling, the test borings would be sealed using neat cement (Portland Type Il cement and bentonite powder) 2.2 Laboratory Testing Laboratory tests would be performed on selected recovered samples to evaluate their physical and engineering characteristic d to aid in the engineering analyse; he testing program woulc .�7