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r � <br /> 4.0 CONCLUSIONS, RECOMMENDATIONS AND PROJECT STATUS <br /> Results from the RISC4 program suggest that risks associated with residual petroleum <br /> hydrocarbons and lead once detected in site soil do not pose unacceptable risks to human <br /> health. The fate and transport model results for the groundwater exposure pathways suggest <br /> that no measurable risks are associated with these pathways. These results are.conservative in <br /> that the maximum detected concentration of each COC in soil vapor, soil, and groundwater was <br /> selected as the representative concentration and laboratory detection limits were applied for <br /> COCs not detected in a particular media. <br /> i <br /> The results o f t he.HHRA combined with a comprehensive evaluation of site conditions clearly <br /> support risk based site closure. Specifically, the source of petroleum hydrocarbon impact (i.e., <br /> the former USTs) has been removed, the site appears to be adequately characterized, <br /> groundwater does not appear to be impacted by significant concentrations of petroleum <br /> { hydrocarbons, the waters of the state and other potential sensitive receptors do not appear to be <br /> threatened, and there does not appear to be a significant risk to human health from any <br /> remaining petroleum hydrocarbons in soil and groundwater beneath the site. <br /> Therefore, Ramage Environmental recommends that no further environmental corrective actions <br /> be required, and that EHD and RWQCB consider this case for regulatory closure. <br /> f <br /> i <br /> Jrr <br /> 15 <br />