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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 /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> SECOR International Project TOSCO 8671,Stockton,CA Sampled 1127199 to 1128199 <br /> 9912 Business Park Drive,Ste 100 Project Number 7G888-010-03 Received 1129/99 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 2112199 <br /> Total Purgeable Hydrocarbons(C6-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) 9020045-MSI 5902029-18 <br /> Xylcnes(total) 213199 0 600 ND 0 546 mg/kg 600-140 910 <br /> Methyl tert-butyl ether 0200 ND 0 197 600-140 985 <br /> Surrogate a a a-Trtfluorotoluene 0200 0 192 600-140 960 <br /> Matrix Spike Dun 9020045-MSD1 S902029-18 <br /> Benzene 213199 0200 ND 0 174 mg/kg 600-140 870 250 0 573 <br /> Toluene 0200 ND 0 170 600-140 85 0 25 0 460 <br /> Ethylbenzene 0200 ND 0 178 600-140 890 250 1 67 <br /> Xylenes(total) 0 600 ND 0 536 600-140 89 3 250 1 89 <br /> Methyl tert-butyl ether 0200 ND 0 196 600-140 980 25 0 0 509 <br /> Surrogate a,a a-Tris luorotoluene 0200 0 192 600-140 960 <br /> 9 <br /> Aft <br /> equoia Analytical-Sacramento *Refer to end of report for test of notes and definitions <br /> Page 9 of i I <br /> Sandra R Hanson,Client Services Representative <br />