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e <br /> I <br /> I <br /> Former She11 Service Station <br /> 1313 East Charter Way <br /> Stockton,California <br /> I <br /> i <br /> Site Description: The subject site is located on the northeast corner of East Charter Way and 1 <br /> Airport Way in a mixed commercial/residential area of Stockton, California. The former site <br /> layout included two station buildings, three fuel underground storage tanks (USTs), and four <br /> dispenser islands. The subject site is currently a vacant lot. <br /> UST Removal. On April 29, 1999 three 10,000-g Ilon single-wall steel gasoline USTs were h <br /> removed from the site. The tanks were found to be in good condition with no obvious ' <br /> indications of failure. Soil samples were collected from the bottom of the UST excavation and <br /> beneath the former fuel dispensers and product pipir g. A total of 14 soil samples were collected. <br /> 1 <br /> All of these samples were analyzed for total pe oleum hydrocarbons as gasoline (TPHg), <br /> benzene, toluene, ethylbenzene, and xylenes (B ), and fuel oxygenates (methyl tertiary butyl j <br /> ether [MTBE], tertiary butyl alcohol [TBA], di isopropyl ether [DIPE], ethyl tertiary butyl ether <br /> [ETBE], and tertiary amyl methyl ether[TAME]. <br /> i <br /> None of the soil samples contained detectable levels of benzene, toluene, or fuel oxygenates. <br /> Nine of the 14 soil samples did not contain detectable levels of TPHg, BTEX, and fuel <br /> oxygenates. Three of the soil samples contained only xylenes at concentrations ranging from <br /> ' 0.0159 to 0.0296 milligrams per kilogram (mg/Kg) The remaining two soil samples contained <br /> TPHg at concentrations of 4.59 and 54.7 m g. The results of this investigation are <br /> documented in the .Cambria Environmental Tec ology Inc. (Cambria) August 18, 1999 <br /> Underground Storage Tank Removal Report. <br /> Site Investigation 2001: Four soil borings (SB-1 tirough SB-4) were drilled at the site during <br /> July 2001 to assess the vertical and horizontal extent of gasoline constituents in the soil and to <br /> determine if groundwater beneath the site was i patted. Soil analytical results from.this <br /> investigation suggested the horizontal extent of i acted soil is delineated and confined to the <br /> vicinity of boring SB-1. The groundwater sample collected from boring SB-1 contained 780 <br /> micrograms per liter (µg/1) TPHg. and did not contain benzene or MTBE. The results of this <br /> investigation are documented in Cambria's November 7, 2001 Site Investigation Report. <br /> Site Investigation 2002: During December 2002, five groundwater monitoring wells (MW-1 <br /> through MW-5) were installed at the site to monitor shallow groundwater. Soil samples <br /> collected from the well borings during this inves igation did not contain detectable levels of <br /> gasoline constituents. Groundwater samples collet ed from the wells did not contain detectable <br /> 241511 Page 1 of 2 <br />