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Sequoia 680 Chesapeake Drive Redwood City,CA�4msA3 (415) 364-9600 FAX(415) 364-9233 <br /> 404 N.Wiget Lane Walmst Creek,CA 94598 (510) 988-9600 FAX(510)988-9673 <br /> a) Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0100 <br /> WNW <br /> URS Greiner,Inc.-SF Project: Stockton-USPS Sampled: 7/7/98 to 7/8/98 <br /> 100 California Street,Ste.500 Project Number: 43-66600.32 Received: 7/10/98 <br /> San Francisco,CA 94111 Project Manager: Chis Nelson Reported: 7/28/98 <br /> Volatile Organic Compounds 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 /> Batch: 8070283 Date Prepared: 7/20/98 Extraction Method: EPA 50306 IMcQHI _ <br /> Blank 8070183-BLKI <br /> Ethanol 7/20/98 ND mg/kg 150 <br /> Tett-butyl alcohol ND 10.0 <br /> Methyl tert-butyl ether ND 0.100 <br /> Di-isopropyl ether ND 0.100 <br /> Ethyl tert-butyl ether ND 0.100 <br /> Tert-amyl methyl ether ND 0.100 <br /> Surrogate: 1,1-DCA-d4 2.50 2.90 60.0-140 116 <br /> US 8070283-BSI <br /> Methyl tert-butyl ether 7/20/98 2.50 2.58 mg/kg '70.0-130 103 <br /> Surrogate: 1,2-DCA-d4 " 2.50 3.15 60.0-140 116 <br /> US-111M 8070283-BSDI <br /> Methyl tert-butyl ether 7/20/98 2.50 3.12 mg/kg 70.0-130 125 30.0 19.3 <br /> Surrogate: 1,1-DCA-d4 2.50 3.50 60.0-140 140 <br /> Sequoia Analytical-Sacramento 'Refer to end of report for tett of notes and definitions. <br /> L' da C.Schneider,Laboratory Director Page 8 of 9 <br />