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Sequoia 680 Chesapeake Drive Redwood C ty CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Wa]twt Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Strikert'Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 Mcowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-034Z <br /> SECOR International Project ARCO 2093,Tracy,CA Sampled 2/2/99 <br /> 9912 Business Park Drive, Ste 100 Project Number N/A Received 213/99 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 2/17/99 <br /> Total Purgeable Hydrocarbons (C&C12),BTEX and MTBE by DHS LUFT <br /> Sequoia Analytical-Sacramento <br /> Batch Date Date Surrogate Reporting <br /> Analyte Number Prepared Analyzed Limits Limit Result Units Nates* <br /> Inlluenl 5902045-01 All <br /> Purgeable Hydrocarbons 9020043 213/99 2/3199 10 0 690 mg/m'Air I <br /> Benzene 00500 1 29 <br /> Toluene 00500 0 143 <br /> Ethylbenzene 00500 0 120 <br /> Xylenes(total) 00500 0 298 <br /> Methyl tert-butyl ether 0 500 ND <br /> Surrogate a a a-Trtuorotoluene 600-140 995 <br /> E lltent 5902045-02 Air <br /> Purgeable Hydrocarbons 9020043 213/99 2/3199 IO 0 ND mg/m'Air <br /> Benzene 00500 00576 <br /> Toluene 00500 ND " <br /> Ethylbenzene 00500 ND " <br /> lenes(total) 00500 0 164 <br /> Why[tert-butyl ether 0 500 ND <br /> urrogate a a a-Trtfuorotaluene 600-140 103 <br /> e-quoia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Sandra R Hanson,Client Services Representative Page 2 of 6 <br />