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Mary Misemer <br /> November 9, 1999 <br /> Page 3 <br /> Conclusions and Recommendations <br /> The analytical data supporting this investigation appear adequate both in quantity and t <br /> quality. Detection limits were sufficiently low to support the intended end-use of the data. Sec- <br /> tion 5.0 entitled "Human Health Risk Assessment" should be revised to reflect that a risk as- <br /> sessment was not performed. Risk screening using the methodology and equations presented <br /> in the PEA should be used as the screening basis in the future for these sites. <br /> As a courtesy to the authors, HERD calculated a cancer risk level of 2 x 10''for the con- <br /> stituents identified in soils based on all exposure pathways. A hazard index of less than 0.003 <br /> was also calculated based on the soil data and all exposure pathways. The cancer risk and <br /> hazard index values were calculated using the condensed equations in the PEA guidance <br /> (DTSC, 1994). <br /> The residual levels of petroleum-related hydrocarbons in the soils at the site are below <br /> levels that would constitute an unacceptable risk to human health and the environment as evi- <br /> denced by a cancer risk of less than 1 x 10-6 and a hazard index of less than 1.0. Once the <br /> document is appropriately revised, it can support site closure. <br /> Please,call me [(916) 327-2510] if you have any questions regarding the evaluation of <br /> the above document. <br /> Reviewed by: Steve DiZio, Ph.D. <br /> Senior Toxicologist, HERD <br /> i, <br />