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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(9Z5)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 ARCO 2133,Stockton,CA Sampled 12/17/98 <br /> 9912 Business Park Drive,Ste 100 Project Number 76600-603-04 Received 12/18/98 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 1/6/99 <br /> Total Purgeable Hydrocarbons (C6-C12),BTEX and MTBE by DHS LUF F/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> lAnalyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Matrix Spike(continued) 8120320-MSI S812278-09 <br /> Xylenes(total) 12/23198 300 746 355 ug/1 600-140 93 5 D <br /> Methyl tert-butyl ether 100 ND 104 600-140 104 D <br /> Surrogate a a a-Trifluorotoluene 100 8 76 600-140 876 <br /> Matrix Spike Dup 8120320-MSDI 5812278-09 <br /> Benzene 12/23/98 100 ND 923 ug/I 600-140 923 25 0 0 980 D <br /> Toluene 100 330 446 600-140 116 250 171 D <br /> Ethylbenzene 100 128 109 600-140 96 2 250 3 17 D <br /> Xylenes(total) 300 74 6 367 600-140 975 25 0 4 19 D <br /> Methyl tert-butyl ether 100 ND 107 600-140 107 250 2 84 D <br /> Surrogate a a a-Tri luorotoluene /00 847 600-140 84 7 <br /> equoia Analytical -Sacramento *Refer to end of report for test of notes and defrnruons <br /> t�;�67 IC page 8 of 9 <br /> Linda C Schneider, Laboratory Director <br />