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San Joaquin Count�A blic Health Services l ! <br /> Page 2 FJ <br /> These data show substantially lower MTBE concentrations than results associated with samples collected <br /> during 1999 and 2000,when concentrations as high as 99,000.µg/l were detected. <br /> These results also show lower MTBE concentrations in offsite well MW-7 (426 µg/)in comparison with the <br /> prior sampling event,when 8,600µg/was detected. <br /> PHS requested a workplan for additional assessment based on rising MTBE concentrations in monitoring <br /> wells located adjacent to the underground storage tanks,as well as the recent detection of MTBE in offsite <br /> well MW-7. Given the declining MTBE concentrations at this site,BP suggests that continued coordinated <br /> quarterly monitoring occur in order to corroborate these declining concentration trends in lieu of a workplan' <br /> for additional investigation. <br /> Please give me a call at(425)251-0689 if you have any comments or questions. <br /> Sincer ly, <br /> Scott Hooton <br /> i <br /> attachment <br /> cc: site file <br /> David Camille—Tosco(w/attachment) <br /> Cindy Magyar—Blaine Technical Services <br /> Robert Kitay,Aquascience,208 West El Pintado Road,Danville,CA 94526 <br /> Roger Hoffmore,Seacor,3017 Kilgore Road;STE 100,Rancho Cordova,CA 95670 <br /> y <br /> I <br /> i <br /> i <br /> I <br /> 1 <br />