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i <br />'C Stockton 99 Speedway <br /> Preliminary Endangerment Assessment Workplan April 12,2007 <br /> �.J 3.1.4.3 Hypothetical Outdoor Construction Worker Receptor <br /> Potential exposures for this receptor are expected to occur from working outdoors only. Because this <br /> receptor is not expected to be working in buildings, inhaling chemical vapors while indoors was not <br /> considered a complete and significant exposure pathway for this receptor. <br /> The exposure pathways assumed to be complete and significant for the hypothetical outdoor construction <br /> i worker receptor include: <br /> • Incidental ingestion of soil; <br /> • Dermal contact with soil; and <br /> • Inhalation of dusts/vapors in outdoor air generated from soil. <br /> 3.1.4.4 Hypothetical Residential Receptor <br />{. Potential exposures for this receptor are expected to occur from time spent indoors and outdoors. The <br /> exposure pathways assumed to be complete and significant for the hypothetical residential receptor <br /> include: <br /> Incidental ingestion of soil; <br /> • Dermal contact with soil; and <br /> f <br /> • Inhalation of dusts/vapors in outdoor air generated from soil. <br /> t <br /> 3.1.5 Summary of Data Needs <br /> Additional data regarding the presence of COPCs in soil at the Site are needed to. <br /> • Assess the nature and extent of contamination at the Site; <br /> 4 . Evaluate the risks posed by contamination at the Site to human health and the environment; and <br /> • Evaluate potential remedial alternatives to mitigate the risks.. <br /> This section presents a summary of the additional data needs for each AOC. <br /> Two soil investigations have been conducted at the Site that have included the Debris Fill Area, <br /> Retention Basin Area, and the Racetrack Area. Additional data for the characterization of each AOC are <br /> ' identified below: <br /> Debris Fill Area: Investigations by SGI and Kleinfelder have identified the presence of arsenic, cadmium, <br /> and lead in concentrations that exceed their respective CHHSLs. In addition, petroleum hydrocarbons, <br /> and organochlorine pesticides were also detected in samples collected from this area. However, the <br /> PEAwod#a,.Fro1.da 3-5 The Source Group,Inc. <br /> --y <br />