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Human Health Risk Assessment <br /> Former Mobil Oil Bulk Plant 04-343 <br /> 540 East Grant Line Road <br /> Tracy, California M <br /> 5.3.1 Identification of Potentially Exposed Populations <br /> A number of current and future populations may potentially be exposer, by the inhalation route <br /> of exposure from chemicals present in subsurface soil at this site. The potentially exposed <br /> populations include the following: <br /> CURRENT RECEPTORS <br /> Offsite <br />' • Employees of businesses located east and north of the site <br /> • Patrons to the businesses near the site <br /> FUTURE RECEPTORS <br />' Onsite <br /> • Employees of a hypothetical business on top of the site <br /> The potential exposure to toxicant vapors (benzene, toluene, ethylbem(.ne, and xylenes) under <br /> current conditions by the employees of Doane's Product Company anu Leprino Foods, and the <br /> ' patrons to these businesses may be significant. In the exposure quantification, the quantitative <br /> toxicant concentration at point of intake is equivalent for both employees and patrons. The <br /> duration of exposure for the patron population, however, is anticipated ;.'o be non-continuous and <br /> less than the exposure duration experienced by the employee population. hence, a risk evaluation <br /> on the exposure of the working population to toxicant vapors released from the site is conducted <br /> and is health protective of present date visitors to Doane's Product Company and L.eprino Foods. <br /> 5.3.2 Prediction of Airborne Concentrations of BTEX <br /> ' Prediction of airborne chemical concentrations at a potential exposure point is necessary to <br /> quantify the dose of a chemical that may be received by a receptor. G;nerally, the volatility of <br /> a vnntamimnt determines the signifir-.anr_.P of the inhalatinn of ehnmi,_als from the. -,uhsmrfare. <br /> 30-0136-11 <br /> 5-4 <br />