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1.0 INTRODUCTION <br /> V <br /> On behalf of the San Joaquin County Facilities Management Department, Ramage Environmental <br /> �. has prepared this Work Plan, Monitoring Well Installations for submittal to the San Joaquin <br /> County Public Health Services Environmental Health Division (PHS/EHD) and to the Central <br /> Valley Regional Water Quality Control Board (RWQCB). PHS/EHD requested this work plan on <br /> L. May 29, 2001. <br /> A.. 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 /> 1.2.1 UST System Removal <br /> On August 30, 1995, 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. <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). The results of these soil sample analyses are summarized in Table 1. <br /> Total Petroleum Hydrocarbons (TPH)-as-gasoline, toluene, ethylbenzene, and xylenes were <br /> _ detected in the soil sample collected from beneath a disintegrating joint in the underground piping <br /> (P1), and all three soil samples collected from beneath the former UST. Benzene was only <br /> detected in the soil sample collected at 13 feet from beneath the north end of the former UST, and <br /> methyl tertiary butyl ether(MTBE) was only detected in the soil sample collected at P1. The other <br /> soil sample collected along the former underground piping, and the soil sample collected from <br /> beneath the former dispenser did not contain detectable concentrations gasoline hydrocarbons. <br /> 4 <br />