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PRE-TANK REPLACEMENT Site Assessment Results <br />4315 WATERLOO RD, STOCKTON, CA <br />Aegis Project No. 89-047 <br />Page 4 <br />2.0 BACKGROUND INFORMATION <br />The site is located on the north side of Waterloo road, east of <br />Highway 99, Stockton, San Joaquin County, California, Township 3 N., <br />Range 7 E., Section 6 (Figure 1). The site lies within a commercial <br />area in eastern Stockton. Additional information regarding adjacent <br />land uses, tank storage products, spill, leak and accident history, on <br />and off-site utility locations, site and regional geology, site and <br />regional hydrogeology information is presented in section 2.0 of <br />Aegis' "Pre-Tank Replacement Site Assessment Work Plan" (Aegis, <br />January 2, 1989). <br />3.0 RESULTS <br />The following subsections present the results of investigative <br />activities conducted at the site, including soil conditions and the <br />presence of petroleum hydrocarbons at the existing and proposed <br />underground storage tank locations, as well as the fuel island. <br />3.1 SOIL CONDITIONS <br />A total of fourteen soil borings were drilled, sampled and logged, <br />according to the methods described in Appendix A, at the locations <br />presented in figure 2. Soil borings ranged in depth from 10.0 ft. to <br />20.0 ft. below the ground surface (bgs). Soil boring logs generated at <br />the time of drilling are contained in Appendix B for review. <br />The soil boring logs were used to compile generalized cross sections <br />A-A' and B-B', which are presented in figure 3. As depicted in the <br />cross sections, soil types are generally consistent across the site. <br />Silty clay (Unified Soil Classification System symbol CL) was the <br />predominant soil type encountered in the soil borings. However, a <br />sandy unit was encountered in several soil borings at depths of about <br />20 ft. The sandy unit may occur as lenses within the clay unit. <br />3.2 GROUND WATER CONDITIONS <br />Free ground water was not observed in any of the soil borings drilled <br />at the site, to the maximum depth explored of 20.0 ft. Well logs from <br />water and monitoring wells near the site indicate first ground water <br />is probably present between 55 ft. and 65 ft. bgs.