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I 3. 0 EFFLUENT HANDLING All effluent generated during assessment activities was sealed in labeled 55-gallon drums. The drums were stored ' on-site, pending the results of the analytical testing, at which time the appropriate disposal method was determined. i 4. 0 SUBSURFACE CONDITIONS The subsurface conditions encountered In the soil borings are presented on the boring logs (see Appendix A) . The following is a generalized summary of the soil stratigraphy ' encountered. 4 . 1 FILL ' The fill at the Site generally occurs as gravel base material below the asphalt and concrete surface, and as fill material in the vicinity of the former location of the USTs, underground pipelines and sewer lines. 4 . 2 NATURAL GROUND The material encountered in the borings consisted generally of interbedded brown to light reddish brown, mottled dark brown clayey silt and sandy to silty clay to the depths explored (30 feet bgs) . The soil materials encountered were thinly layered and slightly porous in a moist and stiff condition. A solvent odor was noted in soil samples collected from boring B-9 from a ' depth of 4 feet bgs to the termination depth of the boring. 4 . 3 GROUND WATER ' No ground water was encountered during drilling. The depth to ground water at the Site is reported to be approximately 61 feet bgs. This depth is based on the water depth obtained from ' Observation Well Station No. 11 measured sometime in 1984 . The well is located in the vicinity of the intersection of Inglewood Avenue and Lincoln Road (personal communication with Ed Formosa, City of Stockton Municipal Utilities Department, July 6, 1992) . 5. 0 ANALYTICAL TESTING 5 . 1 SOIL SAMPLES All soil samples were delivered for analytical testing to Calscience Environmental Laboratories, Inc. , a California ' Project No. 1232 -5- E1VVIRONMENTAL AUDIT,INC®