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r u 3.3 Stockpile Soil Sampling On June 1G, 1992, as directed by Mr. Harlin Knoll, the excavation on stockpile located an site containing petroleum by rb constituents, designated SP1) was sampled by a TPE registered geologist. The excavation soil stockpile considered previouslyclean (based on PIU measurements, designated SP2) also transported off site for use as land fill. This material was sampled by a TPE geologist. A total of five samples were collected from each stockpile area. The on sample present locations d by Mr. orientationof the Knoll) were randomly based a drive tuba core sampler stockpiles. The samples were taker, with containing a 2-inch X 6-inch brass tube Thlast cs endreapsa were covered with a tefIon liner, capped with p sealed with duct tape, and placed on ice. Accompanied by a chain- of-custody form, the samples were transported to Applied P & Ch Laboratory (a California Department of Health Services certified laboratory) for chemical analysis. Prior to analysis, the five discrete soil samples collected from each stockpile site were omposite sample from each composited by the laboratory into one c area_ 3.3.1 Chemical Analytical Results composited stockpile sample sp--1 was nondetectable for TPHG and al aromatic constituents. showed only low concentrations of sever i Composited stockpile sample SP-2 was nondetectable for all of the constituents tested. A summary of the analytical results are presented in Table 2 and laboratory data sheets are included in Appendix A. 4,0 REGIONAL AND SITE GEOLOGY The site is located in the San Joaquin Valley of the Central Valley physiographic province. The central Valley Province is a northwest - southeast structural trough filled by streamborn detritus derived from the Sierra Nevada. This detritus includes up to 25,000 feet of alluvial, lacustrine, and marine deposits of Cretaceous to - Holocene age. 8