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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(6501 364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (9 16)921-9600 FAX(916)921-0too <br /> Analytical :455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792.0342 <br /> 1551 Industrial Road San Carlos CA 94070-41 11 (650)232-9600 FAX(650)232-9612 <br /> • <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-Cl 2), BTEX and MTBE by DHS LUF11 <br /> Sequoia Analytical-Sacramento <br /> Batch Date Date Surrogate Reporting <br /> Analyte Number Prepared Analyzed Limits Limit Result Units Notes* <br /> Influent 5903311-01 Au <br /> Purgeable Hydrocarbons 9030384 3/26/99 4/1/99 100 202 mg/m'Air ] <br /> Benzene 00500 ND " <br /> Toluene 00500 0 951 " <br /> EthyIbenzene 00500 0 583 " <br /> Xylenes(total) 00500 11 1 " <br /> Methyl Cert-butyl ether 0 500 ND " <br /> Surrogate a a a-Trtfluorotoluene 600-140 129 % <br /> Effluent 5903311-02 Air <br /> Purgeable Hydrocarbons 9030384 3126/99 411199 100 390 mg/m'Air 1 <br /> Benzene 00500 ND <br /> Toluene 00500 00676 " <br /> EthyIbenzene 00500 00794 <br /> nes(total) 00500 266 <br /> yl tert-butyl ether 0 500 ND <br /> Surrogate a a a-Trrfluorotoluene 600 140 106 % <br /> equoia Analytical-Sacramento *Refer to end of report for test of notes and definitions <br /> 50'?'Y1v '�� //X/�J <br /> Sandra R Hanson,Client Services Representative Page 2 of 6 <br />