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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 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)Z32-9612 <br /> (JR <br /> SECOR International Project ARCO 2133,Stockton,CA Sampled 3115199 <br /> 9912 Business Park Drive,Ste 100 Project Number 7G600-079-04 Received 3116199 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 4/l/99 <br /> Total Purgeable Hydrocarbons(C6-C12),BTEX and MTBE by DHS LUFr/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 /> Matrix Spike Dup(continued) 9030375-MSD1 S903290-05 <br /> Ethylbenzene 3130199 100 ND 903 ug/l 600-140 903 25 0 1 11 <br /> Xylenes(total) 300 ND 270 600-140 900 25 0 1 12 <br /> Methyl tert-butyl ether 100 ND 141 600-140 141 25 0 967 3 <br /> Surrogate a a a-Trifluorotoluene 100 948 600-140 948 <br /> 0 <br /> uola Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Sandra R Hanson,Client Services Representative Page 19 of 22 <br />