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1551 [ndustial,Rc d <br /> Sequoia San Carlos,CA 94070-4111 <br /> (650)232-96M <br /> Analytical FAX(650)232-9612 <br /> /�, <br /> www segaomlabs tom <br /> - - I <br /> 3 May, 2002 3 <br /> r jw <br /> Deanna Harding <br /> Gettler-Ryan Geostrategles <br /> 6747 Sierra Court, Suite J <br /> Dublin, CA 94568 <br /> Re Tosco 4409 <br /> Sequoia Report L204085 <br /> Dear Deanna Harding <br /> Enclosed are the results of analyses for samples received by the laboratory on 4118102 <br /> I <br /> Sample MW-10 has a reported MTBE value of 100 ug/L by EPA 8021B,however, the <br /> EPA 8260B MTBE result on this sample is ND All of the data has been reviewed and <br /> no laboratory discrepancies were noted <br /> Based upon the data review, there was co-elution of MTBE with 3-methyl-pentane on the <br /> EPA 8021B analysis and the reported value of 100ug/L is a false positive The 8260B <br /> chromatogram and spectra have been reviewed for sample MW-10 and the MTBE result <br /> for this sample is ND. <br /> If you have any questions concerning this report, please feel free to contact me <br /> Sincerely, <br /> Wayne Stevenson <br /> Project Manager <br /> CA EI:AP-Certificate#2360 <br />