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•1 r <br /> ■ , Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364-9600 FAX(650)364.9233 <br /> f"rrrrrr`��■���i 404 N. Wiset Lane Walnut Creek,CA 94598 (510) 988.9600 FAX(510)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,C4 95834 (916) 921-9600 FAX (916) 921-0100 <br /> IWO <br /> EMCON-Sac Project: Arco 2186,Stockton,CA Sampled: 6/24/98 <br /> 1433 N. Market Blvd. Project Number: 21775-237-002 Received: 6/24/98 <br /> Sacramento,CA 95834 Project Manager: Dave Foley Reported: 7/16/98 <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 /> Anal e Ana] zed Level Result Result Units Recov. Limits % Limit % Notes* <br /> Batch. Q70211 Date, Prepared.-M/98 <br /> Bl=k _ <br /> Ethanol 7/7/98 ND ug/I 3000 <br /> Tert-butyl alcohol ND 200 <br /> Methyl tert-butyl ether ND 2.00 <br /> Di-isopropyl ether ND 2.00 <br /> Ethyl tert-butyl ether ND 2.00 <br /> Tert-amyl methyl ether ND 2.00 <br /> Surrogate: 1,2-DCA-d4 50.0 56.4 60.0-140 113 <br /> 1LCS 8070211-BSI <br /> Methyl tert-butyl ether 7/7/98 50.0 44.9 ug/I 70.0-130 89.8 <br /> Surrogate: 1,2-DCA-d4 50.0 44.2 60.0-140 88.4 <br /> 8020211-BSD 1, <br /> yl tert-butyl ether 7/7/98 50.0 47.5 ug/I 70.0-130 95.0 25.0 5.63 <br /> rogate: 1,2-DCA-d4 50.0 48.3 60.0-140 96.6 <br /> uoia Analytical Sacramento *Refer to end of report for text of notes and definitions. <br /> Ronald W BObel,Client Services Representative Page 8 of 9 <br /> c� <br />