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X11 1 <br /> Ms Lori Duncan Project No 120221 03000000 <br /> 16 August 3, 2006 <br /> Page 4 <br /> rCONCLUSIONS <br /> Analytical results for groundwater samples collected from the site were generally consistent with <br /> previous sampling events Measured groundwater elevations increased between 2 42 and 2 97 <br /> feet from the February 6, 2006, sampling event The measured groundwater elevation in well <br /> VW-3D decreased S 46 feet from the February 6, 2006, sampling event The groundwater <br /> elevations during the first quarter of 2006 indicated a broadly southeastern direction of flow that <br /> was generally consistent with that observed at nearby sites <br /> No indications of free petroleum product or sheen were present in any of the wells or <br /> groundwater samples Concentrations of TPH-g and benzene in samples from well VW-2D and <br /> MW-4R remain high <br /> Analyte concentrations in samples from well MW-IR have rebounded since SVE system shut-off <br /> in 2004 (Appendix D) Analyte concentrations in samples from the prior site wells do not <br /> appear to have been influenced by the cessation of SVE operations <br /> Shaw will continue to perform quarterly groundwater sampling The next sampling event is <br /> 1 tentatively scheduled for August 2006 <br /> RECOMMENDATION <br /> Shaw recommends discontinuing analysis for MTBE, and analyzing site water samples for TPH <br /> as diesel for the next four quarters The bases for these recommendations are <br /> o The absence of detectable MTBE in all site samples collected after 2001 <br /> ® The potential that weathered gasoline hydrocarbons may be inadequately quantified as <br /> only TPH-g <br /> i <br /> I <br /> N 4TechP&l20221 Don RodgersTpts106-QZ2Q06_tdoc SHAW ENVIRONMENTAL,INC <br />