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c 8 <br /> Sequoia <br /> Sequoia a Sacramento <br /> Avo5t3 <br /> Sacramento CA 95834 <br /> AnalyticalFAX <br /> a— ) (916)921 9600 <br /> iW (916)921 0144 <br /> www sequotalabs com <br /> SECOR International-Rancho Cordova Project TOSCO 11193,Stockton,CA 5304255 <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 04/29/03 08 52 <br /> Volatile Organic Compounds by EPA Method 8260B- Quahty Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RFD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3040335-EPA 5030B [P/TJ _ <br /> Laboratory Control Sample(3040335-BSI) Prepared 04/19/03 Analyzed 04/20/03 <br /> Methyl tert-butyl ether 27 0 2 0 ug/l 22 4 121 60-140 <br /> Surrogate 1,2-DCA-d4 33 7 25 0 135 60-140 <br /> Laboratory Control Sample(3040335-BS2) Prepared&Analyzed 04/21/03 <br /> Methyl tert-butyl ether 22 8 2 0 ug/l 224 102 60-140 <br /> Surrogate 1 2-DCA-d4 - 295 25 0 _ 118 60-140 <br /> Matrix Spike(3040335-MSI) Source 5304294-02 Prepared 04/21/03 Analyzed 04/22/03 <br /> Methyl tert-butyl ether 24 5 2 0 ug/l 22 4 ND 109 60-140 <br /> Surrogate 11-DCA-d4 34 5 ~;" 25 0 V 138 60-140 <br /> Matrix Spike Dup{3040335-MSDI) 5 —Source 5304294-02 Prepared 04/21/03 Analyzed 04/22/03 <br /> Methyl tert-butyl ether 27 2 2 0 ug/l 224 ND 121 60-140 10 25 <br /> Surrogate 12-DCA-d4 334, 25 0 134 60-140 <br /> t <br /> i <br /> i <br /> I <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 18 of 19 <br />