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Sep • 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> lJl, uOla 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 /> 4D4,/D- Analytical 1455 McDowell Blvd North,Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 1551 Mustrial Road San Carlos CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> 0 <br /> SECOR Intemational Project Chevron 9-6258,Stockton,CA Sampled 4/6/99 to 417199 <br /> 9912 Business Park Drive,Ste 100 Project Number 7GO07-018-01 Received 418199 <br /> Sacramento,CA 95827 Project Manager Roger Hoffmore Reported 4/22/99 <br /> Volatile Oxygenate Compounds by EPA Method 8260A/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> Anal a <br /> Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch, 9040173 Date Prepared.,41.15199 Extraction Method, Epi,5030B IMeQHI <br /> Blank 9040173-BLKI <br /> Tert-butyl alcohol 4/15/99 ND mg/kg 100 <br /> Methyl tert-butyl ether ND 0 100 <br /> Di-isopropyl ether ND 0 100 <br /> Ethyl tent-butyi ether ND 0 100 <br /> Tert-amyl methyl ether ND 0 100 <br /> Ethanol ND 150 <br /> Surrogate 12-DCA-d4 250 247 600-140 988 <br /> LSA <br /> 9040173-BSI <br /> Methyl tert-butyl ether 4/15199 250 262 mg/kg 700-130 105 <br /> Surrogate 1 2-DCA-d4 250 248 600-140 992 <br /> Matrix Spike 9040173-MSI S904I59-02 <br /> ddftethyl te_rt-butyl ether 4/15/99 - 250 ND 230 mg/kg 600-140 920 <br /> 1111111111TUrrogate 12-DCA-d4 11250 218 600-140 872 <br /> Matrix Spike Duo 9040173-MSDI 5904159-02 <br /> Methyl tert-butyl ether 4/15/99 250 ND 221 mg/kg 600-140 $84 250 399 <br /> Surrogate 12-DCA-d4 250 223 600-140 892 <br /> equoia Analytical Sacramento *Refer to end of repo,t for text of not's air+ 7Cj-rFLI,,M, <br /> Sandra R Hanson,Chen[Services Representative Page 22 of 23 <br /> fid' <br />