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+, Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988 9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (9 16)921-9600 FAX(916)92 1-0 100 <br /> Analytical 1455 McDowel[ Blvd North Ste D Petaluma CA 94954 (707) 792-1865 FAX(707)792-034Z <br /> 1551 Industrial Road San Carlos CA 94070 41 1 1 (650)232 9600 FAX(650)Z32-9612 <br /> 40 <br /> SECOR International Project TOSCO 8671,Stockton,CA Sampled 2/15/99 <br /> 9912 Business Park Drive,Ste 100 Project Number 70888-010-01,Task# 12 01 Received 2/16/99 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 3/2/99 <br /> Volatile Organic Compounds by EPA Method 8260A/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 /> Batch, 9020207 ate Prepared. 2118/88 Extraction Method. EPA 5030B IP/TI <br /> link 9020207-131,K1 <br /> Teri-butyl alcohol 2/18/99 ND ug/l 200 <br /> Methyl tert-butyl ether ND 200 <br /> Di-isopropyl ether ND 200 <br /> Ethyl tent-butyl ether ND 200 <br /> Ten-amyl methyl ether ND 200 <br /> Surrogate 1,2-DCA-d4 500 502 600-140 100 <br /> ,HCS 9020207-BSI <br /> Methyl ten-butyl ether 2/18/99 500 53 8 ug/l 700-130 108 <br /> Surrogate 12-DCA-d4 11500 55 6 600-140 111 <br /> Matrix Spike 9020207-MS1 5902230-01 <br />,doMethyl tert-butyl ether 2/18/99 500 3 06 53 0 ug/l 600-140 999 <br /> rrogate 1,2-DCA-d4 It <br /> 500 526 It600-140 105 <br /> Matrix Spike Duu 9020207-MSDI S902230-01 <br /> Methyl tert-butyl ether 2/18/99 500 3 06 55 6 ug/1 600-140 105 25 0 498 <br /> Surrogate 1,2-DCA-d4 It500 544 600-140 109 <br /> I <br /> quoia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Sandra R Hanson,Client Services Representative Page 5 of 6 <br />