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Sequoia 819 Striker Avenue Surto 8 <br /> 5auamento CA 95834 <br /> 15) (916)921-9600 <br /> FAX(916)921-0100 <br /> Analytical www sequoialabs com <br /> SECOR International-Rancho Cordova Project Former Chevron 9-8632,Tracy,CA <br /> 3017 Kilgore Road, Suite 100 Project Number 077 43506 150 Reported <br /> Rancho Cordova CA,95670 Project Manager Bill Brasher 06/15/01 13 38 <br /> Volatile Oxygenate Compounds by EPA Method 8260A - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1050357-EPA 5030B [P/T[ <br /> LCS(1050357-BS1) Prepared&Analyzed 05/31/01 <br /> Methyl tert-butyl ether 510 20 ug/1 500 102 60-140 <br /> Surrogate 12-DCA-d4 482 500 964 60-140 <br /> Matrix Spike(1050357-MS1) __ Source S105405-04 Prepared&Analyzed 05/31/01 <br /> Methyl tort-butyl ether 507 20 ug/1 Soo ND 992 60-140 <br /> Surrogate 12-PCA-d4 489 300 978 60-140 <br /> Matrix Spike Dup(1050357-MSD1) Source 5105405-04 Prepared&Analyzed 05/31/01 _ <br /> Methyl tert-butyl ether 507 20 ug/1 500 ND 992 60-140 000 25 <br /> Surrogate 12-DCA-d4 484 500 968 60-140 <br /> dfth 1060013-EPA 5030B [MeOH[ <br /> Bk(1060013-BLKI) Prepared&Analyzed 06/04/01 <br /> Tert-bury]alcohol ND 10 mg/kg <br /> Methyl tert-butyl ether ND 0 10 " <br /> Di-Isopropyl ether ND 0 10 " <br /> Ethyl tert-butyl ether ND 0 10 <br /> Tert-amyl methyl ether ND 0 10 " <br /> Ethanol ND 150 " <br /> 1 2-Dichloroethane ND 0 10 " <br /> Ethylene dibromide ND 0 10 " <br /> Surrogate 1 2-DCA-d4 234 250 936 60-140 <br /> LCS(1060013-BS1) _ Prepared&Analyzed 06/04/01 <br /> Methyl tent-butyl ether 2 13 0 10 mg/kg 2 50 85 2 60-140 <br /> Surrogate 1 2-DCA-d4 247 250 988 60-140 <br /> ola 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 to its entirety <br /> Da Page 9 of 15 <br />