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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 /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921 0100 <br /> Analytical 1455 McDowell Blvd Borth 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 /> Gettler-Ryan-Sac Project Tosco#6981,Stockton,CA Sampled 5126199 <br /> 3164 Gold Camp Dr, Ste 240 Project Number 240124 03 Received 5126/99 <br /> Rancho Cordova,CA 95670 Project Manager Steve Carter Reported 6B199 <br /> Total Purgeable Hydrocarbons(C6-C22),BTEX and MTBE in Air(ppmv) by DHS LUFTIQuality 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, 9064034 Date Prepared, 5128/99 Extraction Method. EPA 5030B(MeOH) <br /> Bek 9060034•BLKI <br /> Purgeabie Hydrocarbons 5128199 ND ppmv 280 <br /> Benzene ND 00160 <br /> Toluene ND 00130 <br /> Ethylbenzene ND 00120 <br /> Xylenes(total) ND 00120 <br /> Methyl tert-butyl ether ND 0 140 <br /> Surrogate a a a-Tri luorotoluene 000200 000199 600-140 995 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text ofnoteS and defirimonn <br /> � � r <br /> Sandra R Hanson,Client Services Representative Page 7 of 10 <br />