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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 (9Z5)988 9600 FAX(925)988 9673 <br /> ,,,� Analytical 819 Stnket Avenue Suite 8 Sacramento CA 95834 (916)9Z1 9600 FAX(916)921 0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792 1865 FAX(707) 792 0342 <br /> I9 <br /> EMCON Sac Project ARCO 2130, Stockton, CA Sampled 9/l/98 <br /> 1433 N Market Blvd Project Number 21775-229 003 Received 9/2198 <br /> Sacramento,CA 95834 Project Manager Dave Foley Reported 9/24/98 <br /> Volatile Organic Compounds by EPA Metliod 8260A/Quality Control <br /> Sequoia Analytical-Sacramento <br /> I <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes <br /> Batch. 809Q176 D-9f J!reparecl..2/16/98 Extraction Method. F.PA 503Qjl Ip/T1 <br /> Mme' 802417 _RFXI <br /> Ethanol 9/18/98 ND u8/1 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 200 <br /> Ter(-amyl methyl ether ND 2 00 <br /> Surrogate 12-DCA-d4 500 577 600-140 115 <br /> L_CS 8!)90176-BSI-BS I <br /> Methyl tert-butyl ether 9/18198 500 594 ugll 700 130 119 <br /> Surrogate 12-DCA-d4 SO 0 641 600-140 118 <br /> 8090176-MSI S809013-02 <br /> M ert-butyl ether 9/18/98 Soo ND 81 6 ug/I 600-140 163 5 <br /> Su 1e 1 2-DCA-d4 500 82 4 600-140 165 5 <br /> Matrix Spike a Dun $490176-MSn1 5809013-02 <br /> Methyl tert-butyl ether 9/18198 500 ND 81 7 ug/l 600-140 163 250 0 5 <br /> Surrogate 1 2-DCA d4 500 824 b0 0 140 165 5 <br /> ecluIWAnalytical-Sacramento I *Refer t <br /> f o end of report for text of,lvtes and definitions <br /> onald W Bobel,Client Services Representative <br /> Page 6 of 7 <br />