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A S S O C I A T E S I N C <br /> Criterion 2: The site has been adequately characterized. <br /> q Y <br /> The extent of the subsurface impact has been adequately defined to evaluate if the site <br /> poses, or in the future, may pose a threat to human health, the environment, or other <br /> ' nearby receptors. <br /> Criterion 3: No water wells, deeper drinking water aquifers, surface water, or other <br /> ' sensitive receptors are likely to be impacted. <br /> No water wells, deeper drinking water aquifers, surface water, or other sensitive <br /> receptors likely to be impacted were revealed during our study. <br /> Criterion 4: The.site represents no significant risk to human health or the environment. <br /> ' Based on depth to groundwater, limited extent of impacted soil, and distance to <br /> receptors, the subject site does not appear to represent a significant risk to human health <br /> and the environment. <br /> Human exposure to residual petroleum affected soil is unlikely unless excavation of the <br /> soil were to occur. The site is capped with asphalt. <br /> ' 662 Appendix B Check List <br /> Appendix B of the Tri-Regional Board's recommendations checklist of required data for site <br /> closure of USTs has been completed, as appropriate. The checklist is included in this report as <br /> Appendix A. <br /> 1 7.0 SUMMARY <br /> I The distribution of petroleum constituents in soil beneath the site appears to be limited laterally <br /> to the immediate vicinity of the former gasoline tank pit. The highest concentrations are <br /> present between 10 and 15 feet bgs. Petroleum affected soil at this site generally attenuates <br /> ' rapidly with depth and is expected to degrade to nondetectable levels over time. <br /> ' Findings of our evaluation concluded that the project site does not appear to represent a <br /> significant risk to human health and the environment. <br /> ' w:194304Weporislclosure.doc 6 <br />