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9 <br /> Report on Additional Site Assessment March S.2001 <br /> 7-Eleven Inc Store#19976, 1399 N Main St,Manteca,California <br /> The summary of recent and historical sod 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 /> 43 Results of Groundwater Monitoring/Analyses <br /> Table 3 and Figures 313A 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 pg1L TPH-G, and 1,100 Ug/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 /> 1 <br /> 1 <br /> 19978 45A <br />