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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 4 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 4D— Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> so1551 Industrial Road San Carlos CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> Pacific Environmental Group-Sac Project Chevron, 1001621 Banta CA Sampled 2/23/99 <br /> 11315 Sunrise Gold Circle St M Project Number 920 002 2D Received 2/26/99 <br /> Rancho Cordova,CA 95742 Project Manager Chris Brown Reported 3112/99 <br /> Total Purgeable Hydrocarbons(C6-C12),BTEX and MTBE by DHS LUFTIQuallty Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> IAnalytc Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Matrix Sptke(continued.) 9030040-MSI S902349-02 <br /> Xylenes(total) 3/3/99 300 0 882 316 ug/l 600-140 102 <br /> Methyl tert-butyl ether 100 ND 132 600-140 132 <br /> Surrogate a a a-Tris luorotoluene 100 11 7 600-140 117 <br /> Matrix Sk1hrDelp 9030040-MSDI S902349-02 <br /> Benzene 313199 100 ND 103 ug/] 600-140 103 250 381 <br /> Toluene 100 ND 106 600-140 106 250 370 <br /> Ethylbenzene 100 ND 100 600-140 100 250 488 <br /> Xylenes(total) 300 0 882 305 600-140 987 250 329 <br /> Methyl tert-butyl ether 100 ND 142 600-140 142 250 730 7 <br /> Surrogate a,a a-Triuorotoluene 100 108 600-140 108 <br /> I <br /> I <br /> I <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Sandra R Hanson,Client Services Representative Page 14 of 17 <br />