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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Wtlnut Creek CA 94598 (925)988-%00 FAX(925)988 9673 <br /> Anayt�eal 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921 0100 <br /> 1455 McDowell Blvd North Ste D Petaluma_CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 0 <br /> EMCON -Sac Project ARCO 2130,Stockton CA Sampled 12/2/98 <br /> 1433 N Market Blvd Piojecr Number 21775-229 003 Received 12/3/98 <br /> Sacramento,CA 95834 Project Manager Da%e Foley Reported 12/17/98 <br /> Volatile Organic Compounds by ERA Method 8260A <br /> Sequoia Analytical-Sacramento <br /> Batch Date Date Surrogate Reporting <br /> Analyte Number Prepared Analyzed Limits Limit Result Units Notes' <br /> MW-5(75')(continiiP�� SS12046-05 1 ater <br /> Tert-amyl methyl ether 8120207 1213/98 12/3/98 200 ND ug/I <br /> Surrogate 12-DCA-d4 600-140 111 <br /> S8t 2046-Oh Water <br /> Tert-butyl alcohol 8120207 12/3/98 1213/98 200 ND ug/l <br /> Methyl tert-butyl ether 200 ND <br /> DI-isopropyl ether 200 ND " <br /> Ethyl tert-butyl ether " " 200 ND <br /> Tert-amyl methyl ether 200 ND " <br /> Surrogate 12-DCA-d4 600140 111 <br /> MW-7(721) S 8]2045-07 W a ter <br /> tyl alcohol 8120207 12/3/98 12/3/98 200 ND ug/1 <br /> 1 tert-butyl ether 200 ND <br /> DI-isopropyl ether 200 ND <br /> Ethyl tert-butyl ether 200 ND " <br /> Tert-amyl methyl ether 200 ND " <br /> Surrogate 1,2-DCA-d4 600-140 112 <br /> MW-10(71'1-71'1 S8T204b-4R <br /> Water <br /> Tert-butyl alcohol 8120207 1213198 12/3/98 200 ND ugA <br /> Methyl tert-butyl ether 200 ND " <br /> Di-isopropyl ether 200 ND " <br /> Ethyl tert-butyl ether 200 ND " <br /> Tert-amyl methyl ether 200 ND <br /> Surrogate 1,2-DCA-d4 600-140 <br /> 113 <br /> Se Analytical-Sacramento f *Refer to end of report for text of notes and defininons <br /> Ronald W Bobel, Client Services Representative <br /> Page 5 of 10 <br />