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819 Striker Avenue,Suke 8 <br /> Sequoia <br /> 'p qu O i a Sacramento,CA 95834 <br /> J L (916)921-9600 <br /> FAX(916)921-0100 <br /> Analytical °Wa .°om <br /> s <br /> IT Corporation-Sacramento Project: Tosca 4409, Stockton,CA Sampled: 7/20/00 to 7121100 <br /> 1433 N.Market Blvd.,Ste. l Project Number: NIA Received: 7/24/00 <br /> Sacramento,CA 95834 Project Manager Mark Capps Reported: 819/00 <br /> MTBE Confirmation by EPA Method 8260A/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> lAnalyte Analyzed Level Result Result Units Recov. Limits % Limit % Notes• <br /> LCS 0080119-BSI <br /> Methyl tert-butyl ether 8/9100 2.50 2.17 mg/kg 70.0-130 86.8 <br /> Surrogate: 1,2-DCA-d4 " 2.50 2.45 60.0-140 98.0 <br /> Matrix Spike 0080119-MSI S007370-29 <br /> Methyl tent-butyl ether 8/9/00 2.50 ND 2.22 mg/kg 60.0-140 88.8 <br /> Surrogate: 1,2-DCA-d4 1,50 2.49 60.0-140 99.6 <br /> Matrix Spike Dun 0080119-MSD1 5007370-29 <br /> Methyl tert-butyl ether 8/9/00 2.50 ND 2.28 mg/kg 60.0-140 91.2 25.0 2,67 <br /> Surrogate: 1,2-DCA-d4 1.50 2.49 60.0-140 99.6 <br /> 0 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 12 of 13 <br />