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4.2.4 Human Receptors Based on the evaluation of potentially complete pathways, the human receptors associated with the exposure points selected include: • Occupational (Current and Future Lan&Use) • Residential Adult (Future Land Use) ® Residential Child (Future Land Use) The occupational receptor is based on the current and planned land use and the current potential exposure from existing conditions at the site. Currently,occupational receptors are the only exposed populations at the site. Future land use may result in exposure of -occupational receptors, and of adult and child residents on'the site. Currently, there are no plans of developing the site for residential use. However, in order to 'be very protective of 'human health and groundwater, residential receptors were evaluated without the site paving. Including hypothetical residential receptors allows for the evaluation of possible changes of future land uses"since residential receptors have the highest exposure from a site. If there are no risks with residential receptors, there are a generally no risks to occupational employees and other uses where humans may come in contact with the site. 4.3 COMPLETE EXPOSURE PATHWAYS The final component of a complete exposure pathway is an intake route into the body. 4' Table 4-1 summarizes the pathways and exposure scenarios; that are evaluated in this risk assessment. The rational for-the chosen scenarios is provided in Sections 4.2, 4.2.1 _ and 4.2.2. As shown in the Conceptual Site Model (Figure 4-1), the complete exposure pathways evaluated quantitatively for this risk assessment are ingestion of contaminated groundwater, inhalation of volatiles while showering, dermal contact with contaminated groundwater, and inhalation of volatiles from the soil subsurface. These exposures are ., evaluated for the receptors listed above. SALDOYELLO.Rn May 4, 1995 ' 4-5 IJ