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te <br /> 4D Sequoia 819Sctito Cve593 4{ <br /> Sacramento CA 954 <br /> �r (916)921 9600 <br /> Analytical <br /> FAX(9t6)921 0100 <br /> www sequoialebs com <br /> SECOR International-Rancho Cordova Project Tosco 5447,Stockton,CA S307373 <br /> 3017 Kilgore Road,Suite 100 Prosect Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager RustyBenkosky 08/04/03 16 14 <br /> Volatile Organic Compounds 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 3070329-EPA 5030B[P/TJ <br /> Blank 3070329-BLK2 Prepared&Analyzed 07/29/03 <br /> Tert-butyl alcohol ND 0 050 mg/kg <br /> Methyl tert-butyl ether ND 0 0050 " <br /> DI-isopropyl ether ND 0 0050 " <br /> Ethyl tert-butyl ether ND 00050 " <br /> Tert-amyl methyl ether ND 00050 " <br /> Ethanol ND 020 " <br /> Surrogate 1 2-DCA-d4 00478 00500 96 60-140 <br /> Laboratory Control Sample(3070329-BS2) _ Prepared&Analyzed 07/29/03 <br /> Methyl tert-butyl ether 0 0455 0 0050 mg/kg 00500 91 60-140 <br /> Surrogate 1 2-DCA-d4 00477 00500 95 60-140 <br /> &Matnx Spike 3070329-MSl Source 5307542-02 Pre ared 07/24/03 Analyzed 07/29/03 <br /> Methyl tert-butyl ether 00469 0 0050 mg/kg 00500 ND 94 60-140 <br /> Surrogate 12-DCA-d4 00480 00500 96 60-140 <br /> Matrix Spike Dup(307032.9-MSD1) Source S307542-02 Prepared 07/24/03 Analyzed 07/29/03 <br /> Methyl tert-butyl ether 00448 0 0050 mg/kg 00500 ND 90 60-140 5 - 25 <br /> Surrogate 11-DCA-d4 00528 00500 106 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> " Page 9 of 10 <br />