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Bulk Transportation U �! Page 10 <br /> Site Conceptual Model& Closure Report <br /> GPE Project No. 606.3 <br /> August 28, 2009 <br /> } <br /> 6.0 DISCUSSION <br /> 6.1 Conclusions <br /> Analytical data results are summarized,in Summary Table 1. <br /> i 1. An estimated 144 pounds of diesel range p'etrole'um hydrocarbons were <br /> removed by- excavation. Confirmation soil sampling indicated that all of <br /> the release diesel fuel was removed and nonresidual contamination was , <br /> rpresent in the soil or underlying groundwater. <br /> 2. Over the past several years, the spoil soil has been stored in a "bio-cell", <br /> and the diesel contained in the material has been entirely removed by <br /> natural attenuation.. <br /> ' 3. We conclude that the release of diesel j�fuel..at this site has been <br /> adequately mitigated, and does not pose an environmental or human <br /> health risk. <br /> 6.2 Recommendations4 <br /> ' The remedial investigation of the diesel release at this site should be deemed <br /> r, <br /> complete and it should be closed. <br /> u <br /> I% <br /> y <br /> f <br /> 1i <br /> 2937 Veneman Ave.,#B240 Geo-Phase Environmental Inc. Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0293 <br />