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Sequoia 819 acres nto C Suite 4 <br /> Sacramento CA 95834 <br /> (916)92t-9600 <br /> FAX(916)921-0100 <br /> Analytical www sequoialabs corn <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 22 <br /> Volatile Oxygenate Compounds by EPA Method 8260A - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source 0/.RFC RPD <br /> Analyte Result Limit Unns Level Result %REC Limits RPD Limit Notes <br /> Batch 1060013- EPA 5030B IMeOHI <br /> LCS(1060013-BSI) _ Prepared&Analyzed 06/04/01 <br /> Methyl tent-butyl ether 2 13 0 10 nig/kg 2 50 852 60-140 <br /> Surrogate 1 2-DCA-d4 247 250 988 60-140 <br /> Matrix Spike(1060013-MSI) Source 5105448-01 Prepared&Analyzed 06/04/01 <br /> Methyl tert-butyl ether 206 010 mglkg 250 ND 824 60-140 <br /> Surrogate 12-DCA-d4 234 250 936 60-140 <br /> Matrix Spike Dup(1060013-MSDI) Source S105448-01 Prepared&Analyzed 06/04/01 <br /> Methyl tert butyl ether 203 010 mglkg 250 ND 812 60-140 147 25 <br /> Surrogate 12-DCA-d4 227 250 908 60-140 <br /> o to 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 he reproduced in its entirety <br /> Page 13 of 20 <br />