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819 Stryker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www sequoralabs com <br /> SECOR International-Rancho Cordova Project ARCO 2093,Tracy,CA <br /> 3017 I{.tlgore Road,Scute 100 Project Number 2093,Tracy,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 04/01/02 18 44 <br /> MTBE by EPA Method 8260B- 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 2030283-EPA 5030B [P/TI <br /> Matrix Spike(2030283-MSI) Source S203281-09 Prepared 03/22/02 Analyzed 03/23/02 <br /> Methyl tert-butyl ether 21 3 050 ug/l 25 0 ND 852 60-140 <br /> Surrogate 12-DCA-d4 196 250 784 60-140 <br /> Matrix Spike Dn 2030283-MSD1 Source S203281-09 Pre aced 03/22/02 Anal ed 03/23/02 <br /> Methyl Cert-butyl ether 209 050 1:19/1 25 0 ND 83 6 60-140 1 90 25 <br /> Surrogate 1,2-DCA-d4 195 250 780 60-140 <br /> r <br /> uo1a Analytical-Sacramento rhe results In this report apply to the samples analyzed in accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 10 of 11 <br />