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• 680 Chesapeake Drive Redwood City CA 94063 650 364-9600 FAX 650 364 9233 <br /> � Sequoia � ( ) ( ) <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988 9600 FAX(925)988 9673 <br /> Analytical <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)911 9600 FAX(916)921 0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792 1865 FAX(707) 792 0342 <br /> EMCON -Sac Project ARCO 2168,Stockton CA Sampled 8/12/98 <br /> 1433 N Market Blvd Project Number 22312 00 Received 8/13198 <br /> Sacramento CA 95834 Project Manager Dave Foley Reported 8/31/98 <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 /> analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes" <br /> lUlch- $080280 12ate Prepared, 8/26/9 F-),tractjQn MC(hod, EPA 5030B JP/II <br /> I1an� 8080280-BLK1I <br /> thanol 8/26198 ND ug/l 3000 <br /> ert-butyl alcohol IND 200 <br /> Ilethyl Cert-butyl ether ND " 200 <br /> li-isopropyl ether ND 2 00 <br /> thyl cert-butyl ether IND 2 00 <br /> ert-amyl methyl ether ND 200 <br /> rrrogate 1 1 DCA-d4 500 476 600 140 95 2 <br /> CS $080280-BSI <br /> ethyl tert-butyl ether 8/26/98 500 650 ug/I 700-130 130 <br /> irrogate 11-DCA-d4 11 500 43 0 600-140 860 <br /> $080280-BSD1 <br />,thy tert-butyl ether 8126/98 500 73 6 ug/1 700-130 147 300 123 3 <br /> arrogate 11-DCA-d4 500 423 600 140 84 6 <br /> uola Analytical -Sacramento *Refer to end of,eport forlexl ofnotes and deftntltons <br /> ald W Bobel,Client Servtces Repr,sentatwe Page 9 of 10 <br />