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.i <br /> - ` 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 /> Analytical 619 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 %00 FAX(916)921 oroo <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707) 792 1865 FAX(707)792 0342 <br /> E~MCON -Sac Project ARCO 2130,Stockton CA Sampled 9/1/98 <br /> 1433 N Market Blvd Project Number 21775-229 003 Received 9/2/98 <br /> Sacramento,CA 95834 Project Manager Dave Foley Reported 9/24/98 <br /> Volatile Organic Compounds by EPA Method 8260A <br /> Sequoia Analytical- Sacramento <br /> Batch Date Date Surrogate Reporting <br /> Analyte Number Prepared Analyzed Limits Lutist Result Units Notes* <br /> 5809013-02 W a ter <br /> T'ert-butyl alcohol 8090176 9/11/98 9/18/98 200 ND ug/I <br /> Methyl tert-butyl ether 200 ND <br /> DL-isopropyl ether 200 ND " <br /> Ethyl tert-butyl ether 200 ND <br /> Tert-amyl methyl ether 200 ND " <br /> Surrogate l 2-DC,4-d4 600-140 112 % <br /> 5e/qu Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> tonald W Bobel,Client Services Representative Page 4 of 7 <br />