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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 <br /> �,,� Analytical 1551 Industrial Road {916)792 1800 FAX(916)991-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 ( )79Z 1865 FAX(707) 792-0342 <br /> San Carlos CA 94070-41 11 (65500)Z3Z-9600 FAX(650)232 9612 <br /> Sequoia Analytical-San Carlos • <br /> 1551 Industrial Blvd Project N/A Sampled 4/14/99 <br /> Project Number (WO#L904198) Received 4/20199 <br /> San Carlos,CA 94070 Project Manager Mike Gregory <br /> Reported 4/30/99 <br /> MTBE Confirmation by EPA Method 8260A/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Analyte <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch, 4t1m Date PUVAUd-Aa&9-2 <br /> Blank 904Q33201,K1 <br /> Methyl tert-butyl ether 4/28/99 <br /> Surrogate 1SO 0 52 T2-DCA-d4 2 ug/! 200 <br /> �� 8 60 0-140 J06 <br /> Mh20 <br /> y!tert-butyl ether 1 <br /> 4/2$199 500 584 ug/1 <br /> Surrogate 1 2-DCA-d4 500 56 0 70 0-130 117 <br /> 60 0-140 112 <br /> Matrix Spike 9040337�M57 S904340-01 <br /> Methyl tent-butyl ether 4/28/99 500 100 706 u /l <br /> Surrogate 12 g 600-140 121 <br /> SO 0 <br /> 562 600-140 112 <br /> /2X <br /> Methyl tent-butyl ether 4/28/99 50 0 0 0 726 u /l <br /> Surrogate 1 2-DCII-d4 g 600-140 125 250 325 <br /> SO 0 57 2 600-140 114 <br /> Sequala Analytical - Sacramento <br /> *Refer to end of repori for text of notes and defrntito <br /> C~ <br /> r ? <br /> Sandra R Hanson,Client Services Representative <br /> Page 6 of 7 <br />