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Report on Additional Site Assessment 9 <br /> 7-Eleven Inc.,Store#19976, 1399 N.Main St.,Manteca,California March 5,2001 <br /> The summary of recent and historical soil analytical data indicates that the lateral and vertical extent of <br /> the soil hydrocarbon plume has been sufficiently delineated. No further assessment is considered to be <br /> warranted. Soil gas survey data indicates a low-concentration source near the western side of the <br /> underground storage tank area. <br /> 4.3 Results of Groundwater Monitoring/Analyses <br /> Table 3 and Figures 3/3A summarize the laboratory analytical results,of groundwater samples <br /> collected from monitoring wells MW-1 through MW-6 through October, 2000. Dissolved hydrocarbon <br /> concentrations ranged up to 2,000 pg/L benzene,42,000 pg/L TPH-G, and 1,100 pg/L MTBE,with <br /> highest concentrations (except for MTBE) observed in source area well MW-2. Shallow downgradient <br /> well MW-5 contained levels of 12 ug/L benzene, 550 ug/L TPH-G, and 470 ug/L MTBE,while wells <br /> MW-5A and MW-6 contained low to non-detectable concentrations. Copies of the analytical reports <br /> and chain-of-custody forms are included in Appendix D. <br /> 19976.4SA <br /> I <br />