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i a <br /> Bulk Transportation Page 7 <br /> Site Conceptual Model& Closure Report <br /> t GPE Project No. 606.3 <br /> 4 August 28, 2009 <br /> 4.0 DISTRIBUTION OF CONTAMINANTS <br /> The following sub-sections describe the distribution of.diesel hydrocarbonsin <br /> the soil and groundwater. <br /> 4.1 Soil Contamination Removed <br /> Soil samples and laboratory analyses obtained after the tank pit was over- <br /> excavated indicated the removed material contained:. about 700 mg/Kg of <br /> - diesel-range hydrocarbons. Assuming the spoil cell contained 110 cubic yards <br /> of material, it was estimated that about 144 pounds of, diesel- fuel was <br /> r <br /> excavated and stockpiled. <br /> 4.2 Residual Soil Contamination <br /> Seven confirmation soil samples indicated that `'no detectable diesel <br /> contamination was left in place. <br /> 4.3 Groundwater Contamination Removed <br />` During the excavation, groundwater was not encountered and it was not <br /> F <br /> impacted by the diesel release. <br /> rr4.4 Residual Groundwater Contamination <br /> L - <br /> Since the groundwater was not impacted by this release, there can be no <br /> residual groundwater contamination. <br /> 4.5 Residual Contaminants in Spoil Soil <br /> '{ As described above, the spoil material originally contained about 144 pounds <br /> of diesel hydrocarbons. Based on the. laboratory analytical results of the <br /> recently collected composite spoil soil, the diesel-impacted soil has been fully <br /> A. <br /> i remediated and no longer contains detectable diesel hydrocarbons. <br /> I <br /> 2937 Veneman Ave.,#B240 Geo-Phase Environmental Inc. Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0293 <br /> I <br /> i <br />