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Commingled Plume#35 S E C ® R <br /> Chevron 9-4275/ARCO#2133 <br /> Site Conceptual Model <br /> September 1,2006 <br /> Page 13 <br /> 70 POTENTIAL EXPOSURE PATHWAYS AND SENSITIVE RECEPTORS <br /> Potential exposure medium Include the following groundwater, sod, and air Groundwater may <br /> be encountered during well installation, groundwater sampling, and water level monitoring <br /> activities Soil is typically only encountered during well installation or onsite excavation <br /> Impacted soil is predominantly in the vicinity of the dispenser islands and USTs, and away from <br /> structures within which volatile contaminants could accumulate, it is unlikely that soil vapors will <br /> significantly impact the ambient or indoor air quality Figure 13 presents an exposure pathway <br /> model depicting sources responsible for potential exposure and potential pathways of exposure <br /> The exposure pathway model is based on the following assumptions <br /> • City of Stockton Municipal Well #10 is not used for drinking water, <br /> • The area of impacted soil will remained paved so that onsite occupational workers will <br /> not be directly exposed to Impacted sod, <br /> • Impacted soil vapors in the vicinity of the dispenser island will not affect indoor air quality <br /> within the station building <br /> Using these assumptions, the only potential exposure pathways would be for a future <br /> construction worker through the inhalation of soil vapors, contact with groundwater, and direct <br /> exposure to impacted sod <br /> 94275-ARCO 2133 SCM 9-2006 13 <br />