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9.0 INTRODUCTION <br /> On behalf of the San Joaquin County Facilities Management Department, Ramage Environmental <br /> 1 has prepared this Preliminary Investigation and Evaluation Report for submittal to the San <br /> Joaquin County Public Health Services Environmental Health Division (PHS/EHD) and to the <br />' Central Valley Regional Water Quality Control Board (RWQCB) <br /> The project scope of work was completed according to Ramage Environmental's Work Plan, <br /> iPreliminary Investigation and Evaluation, dated July 14, 2000 On July 25, 2000, PHS/EHD <br /> approved the work plan A copy of the work plan approval letter is included in Appendix A <br /> 1 1 Site Location and Description <br /> The subject site is a government vehicle and sheriff bus parking area on the east side of the <br /> county courthouse, located at 222 E Weber Avenue in Stockton, California (Figure 1) One <br />' former 10,000-gallon gasoline underground storage tank (UST) and a single former gasoline <br /> dispenser existed at the site (Figure 2) The parking area site is approximately 12 feet below <br /> street grade <br /> 1.2 Previous Work <br /> On August 30, 1996, Fisch Environmental removed the UST system According to the PHS/EHD <br /> inspection notes, the tank appeared to be in good condition, but the underground piping was <br />' pitted, rusted, and disintegrating at the joints Gasoline odor was noted in the excavation The <br /> tank was disposed at Romic Chemical Corporation in East Palo Alto, California <br />' Two soil samples were collected from beneath the north end and one soil sample was collected <br /> from beneath the south end of the former UST, two soil samples were collected from beneath the <br />' former underground piping, and a single soil sample was collected from beneath the former <br /> dispenser (Figure 2) In addition, four discrete soil samples were collected for analysis from the <br />' waste soil stockpiles The results of these sod sample analyses are summarized in Table 1 <br /> Elevated concentrations of Total Petroleum Hydrocarbons (TPH)-as-gasoline, toluene, <br /> ethylbenzene, and xylenes were detected in the soil sample collected from beneath a <br /> disintegrating joint in the underground piping (P1), and all three soil samples collected from <br /> beneath the former UST Benzene was only detected in the soil sample collected at 13 feet from <br /> 4 <br />