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n i — <br /> 1 .0 INTRODUCTION <br /> Environeering , Inc. (EI) has been contracted by California Tank Lines (Cal Tk) to prepare a <br /> Work Plan to define the vertical and horizontal extent of contamination at their site at 3105 <br /> South EI Dorado Street, Stockton , California from Underground Storage Tanks (USTs) <br /> removed in 1990 and 1998. The site location is shown in Figure 1 . <br /> Two waste oil USTs were removed from Cal Tk's South EI Dorado Street site in 1990. An <br /> investigation of the extent of contamination from this source was conducted by Sierra. <br /> Pacific Groundwater Consultants, Inc. (S-P) and reported in a Report of Investigation dated <br /> 4 February 1997. This involved installation of four bore holes, one of which was converted <br /> to a groundwater monitoring well. Analytical results from the soil and groundwater samples <br /> are located in Appendix A, Table 1 . A recent (September 1998) sample of the groundwater <br /> monitoring well found black, floating oil that appeared to be typical of used motor oil. <br /> Two diesel USTs were removed from Cal Tk's South EI Dorado Street site in September <br /> 1998. Analytical results from soil samples taken beneath the tanks can also be found in <br /> Section 3. 2 Diesel USTs. <br /> This Work Plan was prepared to meet the requirements outlined in a letter from the San <br /> Joaquin County Public Health Services, Environmental Health Division dated 9 October <br /> 1998, <br /> 2.0 SITE DESCRIPTION <br /> The subject site is located in the southern part of the City of Stockton, California. The site is <br /> an essentially level commercial trucking facility, which contains an office building, two truck <br /> maintenance shops, a truck-washing rack, a small above-ground storage tank compound, a <br /> vehicle fueling facility and a large parking area for tank trailers (Figure 2). <br /> 2. 1 Geologic Conditions <br /> The site is situated in the northern part of the San Joaquin Valley, in an area underlain by <br /> several thousand feet of terrestrial and marine sedimentary rocks. The northern San <br /> Joaquin Valley has been a lowland area subject to marine intrusion , flooding and <br /> incremental sedimentation for millions of years. The uppermost 1000 feet of sedimentary <br /> Environeering, Inc. Project No. 98-012.01 1 <br />