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Quarterly Summary Report <br /> Third Quarter 2001 <br /> Tosco #8671 <br /> 8606 Thornton Road <br /> Stockton, CA <br /> City/County ID #: Stockton <br /> County: San Joaquin <br /> BACKGROUND <br /> In May 1998 , product lines and dispensers were upgraded to meet 1998 EPA standards . <br /> Analytical results from soil samples collected from the former product line and <br /> dispenser excavations, and pea gravel samples collected from the top of the USTs <br /> indicated the presence of petroleum hydrocarbons in soil beneath the site. During <br /> product line and dispenser upgrade activities , approximately 21 tons of petroleum- <br /> impacted soil was over-excavated from the site and disposed of at Forward Landfill . <br /> In January 1999, four groundwater monitoring wells (MW- 1 through MW-4) were <br /> installed at the site. Quarterly groundwater monitoring is ongoing. First quarter 2001 <br /> groundwater monitoring results report methyl tert-butyl ether (MtBE) in two of the <br /> wells at a maximum concentration of 838 ppb (MW- 1). <br /> RECENT QUARTER ACTIVITIES (Third Quarter 2001) <br /> 1 . Prepared and submitted quarterly summary report. <br /> 2. Performed quarterly groundwater monitoring and sampling, coordinating sampling <br /> with adjacent service stations. <br /> NEXT QUARTER ACTIVITIES (Fourth Quarter 2001) <br /> 1 . Prepare and submit quarterly summary report. <br /> 2. Perform quarterly groundwater monitoring and sampling, coordinating sampling <br /> with adjacent service stations. <br /> 3 . Perform work as described in the "Work Plan for Additional Site Assessment, Well <br /> Survey, and Site Conceptual Model " (SECOR, October 19, 2001). <br />