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Stockton 99 Speedway <br /> Preliminary Endangerment Assessment Workplan April 12,2007 <br /> • Hypothetical Onsite Residential Receptor. <br /> 3.1.4 Exposure Pathways Considered Potentially Complete and Significant <br /> The fourth and final component, a complete exposure pathway (i.e., route of exposure) is discussed in <br /> r combination with the third component (i.e., presence of receptors) to define those exposure pathways <br /> considered to be complete and significant. Potential contact to Site-related contaminants could occur via <br /> exposure to soil. Pending an ecological survey, exposure pathways associated with ecological receptors <br /> at the Site were not considered identified in this preliminary CSM. The following section summarizes <br /> those pathways considered complete and potentially significant for each human receptor. <br /> 3.1.4.1 Hypothetical Outdoor Commercial/industrial 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. The hypothetical indoor <br /> commerciaVindustrial worker receptor was included to evaluate the indoor air exposure pathway. <br /> The exposure pathways assumed to be complete and significant for the hypothetical outdoor <br />�. commercial/industrial 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 /> 3.1.4.2 Hypothetical Indoor Commercial/industrial Worker Receptor <br /> Potential exposures for this receptor are expected to occur from working indoors only. Although <br /> inhalation in outdoor air may be complete, outdoor air concentrations are typically lower than indoor air . <br /> concentrations due to dispersion; such relatively minor exposures are subsumed by the assumption that <br /> all exposure is from indoor air. Additionally, all outdoor exposures (including soil invasive activities) are <br /> evaluated in the hypothetical outdoor commercial/industrial and construction worker exposure scenarios. <br /> The exposure pathways assumed to be complote and significant for the hypothetical indoor <br /> commercial/industrial worker receptor include: <br /> • Inhalation of vapors in indoor airvolatilizing from the subsurface. <br /> However, since no VOCs have been reported in soil, their exposure scenario would not be expected to <br /> occur. <br /> PEA Waukplan.Final.dac 3-4 The Source Group,Inc. <br />