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Bulk Transportation Page 9 <br /> Site Conceptual Model& Closure Report <br /> j GPE Project No. 606.3 <br /> August 28, 2009 <br /> water production well and be ingested by humans. "In this case, the <br />° groundwater has not been affected, and since soil contamination has been <br /> entirely removed, there is no possibility that leaching'could result in future <br /> impact to groundwater. <br /> s <br /> 5.2.4 Vapor Pathways <br /> y P Y <br /> Volatile chemicals may migrate upward through contaminated soil and be <br /> inhaled by humans in the vicinity. This is especially true in cases where a <br /> building is situated directly above the contaminated soil and does not have a <br /> concrete slab barrier to impede the influx of volatile vapors. In diesel releases, <br /> I there is limifed potential for significant volatile vaporization, because most of <br /> t the diesel chemicals are semi-volatile, rather than volatile. In this case, ` <br /> volatile chemicals are not available to intrude indoor spaces. <br /> 5.3 Environmental Screening Levels <br /> It is normal to evaluate diesel-contaminated site by comparing actual or <br /> estimated contaminant concentration of various media with established <br /> screening levels (ESLs). In this case, there are nocontaminants in any of the <br /> media and no screening level comparison is warranted. <br /> L <br /> 2937 Veneman Ave.,#B240 Geo-Phase Environrnental Inc. Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0293 <br />