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6.4 Human Health Risk Assessment <br /> As is stated in the PEA Manual, the purpose of a PEA screening evaluation is to provide <br /> risk managers with the basic information about the potential risks to human health <br /> associated with hazardous substances, as well as to assist in deciding whether future <br /> characterization, risk assessment or remediation is necessary. <br /> 6.4.1 Potential Exposure Related to Soil Pathways <br /> The soils of the subject property are described above in section 5.0. Ingestion of these <br /> soils with adhered chemicals is a potential exposure pathway. Inhalation of airborne soil <br /> with adhered chemicals is also a potential exposure pathway. Chemicals of potential <br /> concern (COPC's) may be but are not limited to CAM 17 metals, primarily lead and <br /> arsenic, OCP's, PCB's, and Total Petroleum Hydrocarbons (TPH). Airborne soil has the <br /> potential to be transported off-site by strong winds. Given that the site has more cohesive <br /> clay soil types, and partially vegetated the potential for fugitive dust generation from <br /> current conditions is considered minimal. <br /> Any potential release would come as a result of naturally occurring winds. Movement of <br /> soil during construction or soil sampling activities could increase the probability of an <br /> airborne release but will be minimized during construction or soil sampling by Best <br /> Management Practices for dust control measures (e.g., watering, erosion control, etc.). <br /> 6.4.2 Potential Exposure Related to Water Pathways <br /> Groundwater at the Site is described above in Section 5.3. The Site is expected to be <br /> served by the Stockton District of the California Water Service Company (Cal Water), <br /> City of Stockton municipal water and sewer service. Consequently, high potential <br /> exposure related to water pathways at the Site is unlikely and is not being evaluated. <br /> 6.4.3 Potential Exposure Related to Air Pathways <br /> Through historical and current analysis of uses of the Site and Site Reconnaissance no <br /> volatile chemicals were observed at the Site. The Site does lies above an historic gas <br /> field. Consequently, there is a potential inhalation exposure related to air from volatile <br /> chemicals being released at the Site. The soil vapor survey sampling will help to evaluate <br /> this potential. This PEA workplan will determine if and to what extent these COPC's <br /> (i.e. methane, hydrogen sulfide) could impact the health of humans at the Site. <br /> 6.5 Community Profile and Public Notification <br /> The PEA report will be public noticed in both English and Spanish in the local <br /> newspapers of record and made available for public review for 30 days using DTSC <br /> Option A. A public hearing will be conducted at the end of that period. All of this will <br /> be done independently of any California Environmental Quality Act (CEQA) hearings on <br /> the Site. <br /> Preliminary Environmental Assessment Workplan <br /> Proposed Podesta Ranch Elementary School <br /> December 4,2006 <br /> Page 13 of 27 <br />