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Sequoia 819 Striker Ave Ste 8 <br /> 4DSacramento,CA 95834 <br /> 1W Analytical (916)911-9100 <br /> FAX(916)92 1-0100 <br /> www sequoialabs corn <br /> SECOR International-Rancho Cordova Project Tosco 1205,Lathrop,CA S211698 <br /> 3017 Kilgore Road, Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 02/12/03 12 10 <br /> BTEX 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 2120101-EPA 5030B[PIT] <br /> Matrix Spike Du 2120101-MSD1 Source 5211698-05 Prepared&Analyzed 12/05/02 <br /> Methyl tert-butyI ether 11 8 050 119/1 10 9 12 97 60-140 3 25 <br /> Benzene 744 0 50 670 ND 1 1 1 70-130 5 25 <br /> Toluene 38 8 0 50 405 098 <br /> 93 70-130 4 25 <br /> Gasoline(C6-C10) 373 50 550 ND 68 60-140 8 25 <br /> Surrogate Toluene-d8 268 25 0 107 60-140 <br /> Surrogate 4-BFB 304 25 0 112 60-140 <br /> Surrogate 11-DCA-d4 266 25 0 106 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed to 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 />