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z Human Health Risk Assessment <br /> Fortner Mobil Oil Bulk Plant 04343 <br /> 504 East Grant Line Road <br /> Tracy, California <br /> RISK CHARACTERIZATION <br /> This section involves the integration of the data and analysis of the first three components to <br /> determine the likelihood that humans will experience any of the various forms of toxicity <br /> associated with exposure to a chemical. In cases where exposure data are not available, <br /> hypothetical risks can also be characterized. <br /> ' 1.4 REPORT OVERVIEW <br /> The purpose of the remainder of this report is to evaluate, based on the available empirical data, <br /> ' the potential risk to human health posed by residual petroleum hydroa.rbons in the subsurface. <br /> The objective of the risk assessment is to provide guidance on whether the presence of residual <br /> ' petroleum hydrocarbons pose a significant health risk in consideration of the potential <br /> development of the site. The characterization of the potential human health impacts is intended <br /> to provide risk management information necessary to develop future remediation strategies, if <br /> needed, and to mitigate future impacts on human health. The risk asses"ment conforms with the <br /> methodologies set forth by the National Research Council, the United States Environmental <br /> Protection Agency, and the California Department of Health Services (NRC, 1983; EPA, 1986; <br /> DHS, 1986). Guidance documents utilized for this evaluation include,, but are not limited to: <br /> ithe California Site Mitigation Decision Tree Manual (DHS, 1986), the Exposure Factors <br /> Handbook (EPA, 1989a); and the Risk Assessment Guidance for Superfund (EPA, 1989b). <br /> The health risk assessment estimatesotential human health risks s associated with present and <br /> anticipated future site conditions, as determined by previous site characterization. The estimated <br /> risks are then compared to de minimis or allowable risk levels. The assessment evaluates <br /> possible health risks from human exposure to hydrocarbon vapors migrating from hydrocarbon- <br /> affected soil and ground water. <br /> 1.5 ORGANIZATION OF THE RISK ASSESSMENT REPORT <br /> A qualitative overview of the factors affecting the environmental fate and transport of petroleum <br /> hydrocarbons is presented in Section 2.0, Environmental Fate and Transport. Aq uantitative <br /> summary of toxicological endnointc diPCPI fi,P.l a_nd vacn#;na i! raor„t�.ri ;,, Q—+— 'I n rr r <br /> v r ... b»•++u••�+ p vuvaaana iii uVk:L1Vil J.V, XIUI.UfU <br /> 30-0136-11 <br /> 1-17 <br />