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Mr Mike Infurna <br /> Page 3 <br /> SUMMARY <br /> • Groundwater levels rose since December 2002 Groundwater flowed in a southerly <br /> direction <br /> • Since the previous sampling event, concentrations of 1,2-DCA increased in wells MW1 and <br /> MW3 but decreased to non-detectable levels in wells MW4 and U-Haul MW7 <br /> • TBA (MW2 and MW3) and DIPE (MW3) were detected for the first time since sampling <br /> began at the site The source of these reported oxygenates is not readily apparent No <br /> other gasoline oxygenates were detected <br /> • TPHg and BTEX concentrations in wells MW 1 through MW4 were within historical <br /> ranges Petroleum hydrocarbon levels decreased in all wells except well MW3 <br /> Well installation permit applications for the proposed additional monitoring wells have been <br /> submitted to your office, and encroachment permits from San Joaquin County Department of <br /> Public Works have been applied for <br /> If you have any questions or comments please contact Ground Zero at your convenience <br /> Respectfully, <br /> Grou Zer sis, Inc <br /> e <br /> � . D G� <br /> Staff Geologist <br /> GREGORY P. _ <br /> Gregory P Stahl, RG 5023 4L STAHL <br /> CA Certified Hydrogeologist No 264 No. 5023 <br /> Attachments OF CA1.1F���`P <br /> cc Mr and Mrs John Ferraiolo <br /> Mr James L L Barton, CA Regional Water Quality Control Board <br /> Ms Marla Nahorn, Environmental Closures <br /> G 1GROUNDZEIHARRY51ReportslQMR1200311QM2003 doe <br />