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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(6501 3649233 <br /> 404 N Wlget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-%73 <br /> 1319 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)92 1-0 100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 1551 Industrial Road San Carlos CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> SECOR International Project ARCO 2093,Tracy,CA Sampled 3/23/99 <br /> 9912 Business Park Drive,Ste 100 Project Number N/A Received 3/23/99 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 4/5/99 <br /> Total Purgeable Hydrocarbons(C6-C12),BTEX and MTBE by DHS LUFT/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 /> Batch. 2030384 Date Prepar4d. 3/26/99 Extraction Method, EPA 503013(P/T) <br /> Blank 9113,}11384-SLK/ <br /> Purgeable Hydrocarbons 4/1/99 ND mg/ml Air 100 <br /> Benzene ND 00500 <br /> Toluene ND 00500 <br /> Ethylbenzene ND 00500 <br /> Xylenes(total) ND 00500 <br /> Methyl Cert-butyl ether ND 0 500 <br /> Surrogate a a a-Trifluorololuene 200 2 04 600-140 102 <br /> if-S 9030384US 1 <br /> Benzene 4/l/99 2 00 1 94 mg/m'Air 700-130 97 0 <br /> Toluene 200 2 05 700-130 102 <br /> Ethylbenzene 200 2 01 700-130 100 <br /> len�11l) 6 00 5�94 <br /> 70 0-130 92 0thutyl ether 2000 ! 70 0-130 97 0 <br /> Surrogate aaa-Trrfluorotoluene 2 !1 60 0-140 105 <br /> LCS Dup 9930384-BSD1 <br /> Benzene 4/1/99 200 1 93 mg/ml Air 700-130 965 25 0 0 517 <br /> Toluene 200 2 04 700-130 102 25 0 0 <br /> Ethylbenzene 2 00 2 02 700-130 101 25 0 0 995 <br /> Xylenes(total) 6 00 556 700-130 927 250 0 758 <br /> Methyl tert-butyl ether 200 2 05 700-130 102 25 0 5 03 <br /> Surrogate aaa-Trifluorotoluene 200 2 12 600-140 106 <br /> 9equoia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Sandra R Hanson,Client Services Representative Page 4 of <br />