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V %ftoe V 1.0 INTRODUCTION +— On behalf of the San Joaquin County Government Buildings Division, Ramage Environmental has prepared this work plan for submittal to the San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) and the Central Valley Regional Water Quality Control Board (RWQCB). PHS/EHD requested this work plan on May 16, 2000. 1.1 Site Description The subject site is a county government vehicle and sheriff bus parking area on the east side of the L county courthouse, located at 222 E. Weber Avenue in Stockton, California (Figure 1). One former 10,000-gallon gasoline underground storage tank (UST) and a single former gasoline dispenser existed at the site (Figure 2). The parking area site is approximately 12 feet below street grade. 1.2 Previous Work On August 30, 1996, Fisch Environmental removed the UST system. According to the PHS/EHD inspection notes, the tank appeared to be in good condition, but the underground piping was pitted, rusted, and disintegrating at the joints. Gasoline odor was noted in the excavation. The tank was disposed at Romic Chemical Corporation in East Palo Alto, California. Two soil samples were collected from beneath the north end and one soil sample was collected from beneath the south end of the former UST, two soil samples were collected from beneath the former underground piping, and a single soil sample was collected from beneath the former ,r dispenser (Figure 2). In addition, four discrete soil samples were collected for analysis from the waste soil stockpiles. The results of these soil sample analyses are summarized in Table 1. Elevated concentrations of Total Petroleum Hydrocarbons (TPH)-as-gasoline, toluene, ethylbenzene, and xylenes were detected in the soil sample collected from beneath a disintegrating ,., joint in the underground piping (P1), and all three soil samples collected from beneath the former UST. Benzene was only detected in the soil sample collected at 13 feet from beneath the north end of the former UST, and methyl tertiary butyl ether (MTBE) was only detected in the soil sample `r collected at P1. The other soil sample collected along the former underground piping, and the soil sample collected from beneath the former dispenser did not contain detectable concentrations of .. any of the gasoline constituent compounds analyzed. Three of the four soil stockpile samples contained detectable concentrations of TPH-as-gasoline, toluene, ethylbenzene, and xylenes. MTBE was only detected in one of the four soil stockpile samples. 4