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1 t11 <br /> Sequoia 819 Striker Avenue Suite 8 <br /> Sacramento CA 95834 <br /> (916)921-9600 <br /> 100 <br /> Analytical <br /> FAX equo gabs com <br /> www sequolalabs coin <br /> SECOR International-Rancho Cordova Project Chevron 9-1452,Ripon,CA <br /> 3017 Kilgore Road,Suite 100 Project Numher 077 43545 150 Reported <br /> Rancho Cordova CA,95670 Project Manager Scott Gable 08/23/01 15 33 <br /> Volatile Oxygenate Compounds by EPA Method 8260A - Quality Control <br /> Sequoia Analytical - Sacramento <br /> q Y <br /> Reporting Spike Source %R-EC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1080049-EPA 5030B ]P/T] <br /> LCS(1080049-BSI) Prepared&Analyzed 08/06/01 <br /> Methyl tert-butyl ether 496 20 ug/l 500 992 60-140 <br /> Surrogate 1 2-DCA-d4 489 500 978 60-140 T <br /> Matrix Spike(1080049-MSI) Source S108048-01 Prepared&Analyzed 08/06/01 <br /> Methyl Cert-butyl ether 597 20 ug/I 500 ND 119 60-140 <br /> Surrogate 12-DCA-d4 508 500 102 60-140 <br /> Matrix Spike Dup(1080049-MSDI) Source 5108048-01 Prepared&Analyzed 08/06/01 _ <br /> Methyl tent-butyl ether 58 1 2 0 ug/l A 0 ND 116 60-140 272 25 <br /> Surrogate 1 2-DCA-d4 507 500 101 60-140 <br /> 1080084-EPA 5030B ]MeOH] <br /> Blank(1080084-BLK1) Prepared 08/07/01 Analyzed 08/08/01 <br /> Tert-butyl alcohol ND 10 mg/kg <br /> Methyl tert-butyl ether ND 0 10 " <br /> Di-isopropyl ether ND 0 10 " <br /> Ethyl Cert-butyl ether ND 0 10 <br /> Tert-amyl methyi ether ND 0 10 " <br /> Ethanol ND 150 " <br /> l2-Dichloroethane ND 010 " <br /> Ethylene dibromide ND 0 10 <br /> Surrogate 11-DCA-d4 233 250 932 60-140 <br /> LCS(1080084-BSI) Prepared 08/07/01 Analyzed 08/08/01 <br /> Methyl Cert-butyl ether 268 0 10 mg/kg 250 107 60-140 <br /> Surrogate 12-DCA-d4 254 150 102 60-140 <br /> MWota Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> aa Page 18 of 22 <br />