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` Sequoia 680 Chesapeake Drive Redwood City CA 94'363 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 945% (925)988 9600 FAX(925)988-%73 <br /> 1119 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921-0100 <br /> Iwo- 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 41 1 1 (650)232-9600 FAX(650)232-9612 <br /> 0 <br /> ICOR international Project ARCO 2093,Tracy,CA Sampled 4/15/99 <br /> 9912 Business Park Drive,Ste 100 Project Number N/A Received 4/16199 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 4/30/99 <br /> Total Purgeable Hydrocarbons(C6-C12) and BTEX in Air by DHS LUFI'/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.,901Q 187 D-atf_Prepared. 4/I6199 <br /> Extraction Method,_EPA„40�U„{ � <br /> ,Q <br /> B1an$ 9440187-BLKI <br /> Purgeable Hydrocarbons 4/16/99 ND ppmv 2 80 <br /> Benzene ND 00160 <br /> Toluene ND 00130 <br /> Ethylbenzene ND ” 00120 <br /> Xylenes ttutal) ND 00120 <br /> Methyl ten-butyl ether ND 0 140 <br /> Surrogate a a a-Trtfluorotoluene 000200 000186 600-140 93 0 <br /> 0 <br /> ola Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Sandra R Hanson,Client Services Representative Page 5 of 6 <br />