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O <br /> Mr Michael Infurna <br /> Page 3 <br /> + Relative to the previous sampling event, the concentrations of TPHg and TPHd in well MW3 <br /> increased while MTBE decreased Toluene was detected in well MW3 for the first time since <br /> February 2002, ethylbenzene was detected for the first time since February 2003, and xylenes <br /> were detected for the first time since February 2004 None of the TEX compounds exceeded <br /> MCLs <br /> Conclusions <br /> Dissolved contaminants in groundwater at the site consist primarily of TPHd and MTBE BTEX <br /> compounds are absent or present only at trace levels The contaminant plume is localized in the <br /> immediate vicinity of well MW3, and is of very limited extent Although concentrations spikes occur <br /> from time to time, the cumulative data indicate that the plume is not migrating, and dissolved <br /> contaminant concentrations are stable to decreasing <br /> Upcoming Work <br /> As suggested by RWQCB, the additional groundwater data will be evaluated by a qualified chemist to <br /> determine the potential reactions that would be associated with the infection of a chemical oxidizer <br /> into the aquifer The next round of groundwater sampling is scheduled for February 2005 EHD will <br /> be provided with 48 hours notice prior to conducting fieldwork <br /> • If you have any questions or comments please contact Ground Zero at your convenience <br /> Respectfully, <br /> Ground Zer Analysis, Inc <br /> Joseph L Vasquc�` G'� <br /> Staff Geologist GREGORY P. n <br /> N*. 550023 <br /> Gregory P Stahl, RG 5023 <br /> CA Certified Hydrogeologist No 264 'lllt►� � <br /> Attachments <br /> cc Mr Nathan Crum, Valley Pacific Petroleum Services, Inc <br /> Ms Karen Collins, Environmental Closures, Inc <br /> Mr James L L Barton, RWQCB <br /> G IGROUNDZEIWOOLSEY CHTIQMR1200414QM2004 doc <br />