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p y Y • 680 Chesapeake Drive Redwood City,CA 94063 (,650)364.9600 FAX(650)364-9233 <br /> Sequoia 404 N.Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue, Suite 8 Sacramento,CA 95834 (9[G)921-9600 FAX(916)921-0 100 <br /> 5 McDowell . North,Ste. P n I <br /> Analytical 155Road SaCarlo5.CA 94070-41 1 1 (650)231.-9600 FAX(650)232-9612 <br /> Emcon-Cameron Park Projcct: Teichert Stockton Sampled: 4122199 <br /> 3939 Cambridge Road,Ste. 202 Project Number: NIA Received: 4122199 <br /> Cameron Park,CA 95682 Project Manager: MattTurner Reported: 4/23/99 <br /> MTBE by BPA Method 8260A/Quality Control <br /> Sequoia Analytical- Sacramento <br /> Date Spike Sample QC Reporting Limit Recov, RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> Batch: 9040266 Date Prepar?d: 4122/99 Extraction Method7 EPA 5030B IMC0111 <br /> Blank 9040266-B L K 1 <br /> Methyl tert-butyl ether 4/22/99 ND mg/kg 0.100 <br /> Surrogate: 1,2-DCA44 2.50 2.46 60.0-140 98.4 <br /> CS 9040266-BSI <br /> Methyl tert-butyl ether 4122199 2.50 2.99 mg/kg 70.0-130 120 <br /> Surrogate: 1,2-DCA44 " 2.50 2.72 60.0-140 109 <br /> Matrix Spike 9040266-MSI S904251-01 <br /> Methyl tert-butyl ether 4/22199 2.50 ND 2.62 mg/kg 60.0-140 105 <br /> Surrogate: 1,2-DCA-d4 11250 2.36 60.0-140 94.4 <br /> 9040266-MSDI S904251-01 <br /> M ert-butyl ether 4122199 2.50 ND 2.56 mg/kg 60.0-140 102 25.0 2.90 <br /> Surrogate: 1,2-DCA-d4 2.50 2.32 60.0-140 92.8 <br /> • <br /> Sequ) 'a Analytical-Sacramento *Refer to end of report for text of notes and d4 ffinitions <br /> Paoe 3 of 4 <br /> Ronald W. Bobel,Client Services Representative <br />