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680 Chesapeake <br /> City,CA <br /> (650)364-9600 FAX <br /> ) 364 9Z33 <br /> Sequoia 404 N.Wiget LaneDrive Wal Walnut Creek,CA 945983 (925)988-9600 FAX(9205)988-9673 <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1555 Induustrial Rll oad North,Ste.D Sanalarlos,CA 94070-4111 (650)232.ma,CA 94954 (707)79Z-9600 FAX(650) 232-96865 FAY(707) 42 <br /> SECOR International Project: ARCO 4493, Stockton,CA Sampled: 2/10/99 to 2112/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number: N/A Received: 2/16/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 312199 <br /> Total Purgeable Hydrocarbons(C&C12),BTEX and MTBE by DHS LUFT/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(continued) 9020254-MSI 5902287-12 <br /> Xylenes(total) 2/22/99 0.600 ND 0.533 mg/kg 60.0-140 88.8 <br /> Methyl tert-butyl ether 0.200 ND 0.161 60.0-140 80.5 <br /> Surrogate: a,a,a-Tris luorotoluene 0.200 0,198 60.0-140 99.0 <br /> Matrix Spike Duo 9020254-MSD1 5902287-12 <br /> Benzene 2/22/99 0.200 ND 0.169 mg/kg 60.0-140 845 25.0 0.590 <br /> Toluene 0.200 ND 0.165 60.0-140 82.5 25.0 5.31 <br /> Ethylbenzene 0.200 ND 0.171 60.0-140 85.5 25.0 1.16 <br /> Xylenes(total) 0.600 ND 0.529 60.0-140 88.2 25.0 0.678 <br /> Methyl tert-butyl ether 0.200 ND 0.159 60.0-140 79.5 25.0 1.25 <br /> Surrogate: a,a,a-Trifluorololuene 0.200 0.193 60.0-140 96.5 <br /> equoia Analytical -Sacramento *Refer to end of report for text of notes and definitions. <br /> Sandra R. Hanson,Client Services Representative Page 12 of 15 <br />