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6 <br /> Scott Mansholt -2 - 30 March 2006 <br /> Chevron <br /> TAOC Tracy Pump Station <br /> However, Regional Water Board staff cannot make a final decision until the Office of Environmental <br /> Human Health Assessment(OEHHA) completes the human health risk assessment for the onsite <br /> property. Based on the OEHHA assessment, additional borings and samples could be needed. <br /> Based on the findings of the various investigations, we concur that the extent of impacted groundwater has <br /> been adequately delineated offsite- downgradient and additional characterization work is not needed at <br /> this time. <br /> If you have any questions, please call Dean Hubbard at(559)445-5179. <br /> SHELTON R. GRAY C. DEAN HUBBARD <br /> Senior Engineering Geologist Professional Geologist <br /> PG No. 6357 <br /> cc: Michael Infurna, Jr., San Joaquin County EHD, Stockton <br /> Gary Foote, Geomatrix, Oakland <br /> Luis Mercado, SAIC, Sacramento <br />