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819 Striker Avenue Suite 8 <br /> Sacramento )9 95834 <br /> Sequoia (936}921-96009600 <br /> 4D— <br /> 21 <br /> Analytical FAX sequo) labs co 0 <br /> www sequoialabs com <br /> SECOR International-Rancho Cordova Project TOSCO 8671,Stockton,CA <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 01/14/02 15 16 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> North Creek Analytical-Bothell <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1L24025-EPA 5030B [MeOHJ <br /> Matrix Spike Dup(1L24025-MSDI) Source S112270-28 Prepared&Analyzed 12/24/01 <br /> Ditsopropyl ether 092 0 005 mg/kg 1 0 ND 92 60-140 9 1 50 <br /> Methyl tert-butyl ether 10 0 005 1 0 ND 100 60-140 9 5 50 <br /> tert-Butyl Alcohol 45 050 S0 ND 90 60-140 65 50 <br /> Surrogate 1 2-DCA-d4 3 0 4 0 75 57-139 <br /> Surrogate Toluene-d8 3 6 4 0 90 66-122 <br /> Sequoia 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 be reproduced to its entirety <br /> Page Page 25 of 27 <br />