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i <br /> 819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> lx� (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www sequoialabs com <br /> SECOR International-Rancho Cordova Project TOSCO 11192,Stockton,CA <br /> 3017 Kilgore Road,Suite 100 Protect Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 01/02/02 16 41 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch M14008-EPA 5030B(PFI') <br /> Blank(lLl4008-BLK1) Prepared&Analyzed 12/13/01 <br /> Ethanol ND 100 mg/m'Air - - <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether(MTBE) ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> tert-Amyl methyl ether ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethylene dibromide ND 050 " <br /> Surrogate Dihromofluoromethane 514 500 103 50-150 <br /> Surrogate 1,2-Dichloroethane-d4 63 2 500 126 50-150 <br /> LCS(1L14008-BS1_)_ Prepared&Analyzed 12/13/01 <br /> mn�Methyl tert-butyl ether(MTBE) 520 0 50 mg/m'Air 500 104 70-130 <br /> urrogate Dibromofluoromethane 522 500 104 50-150 <br /> Surrogate 1 2-Dichloroethane-d4 621 500 124 50-150 <br /> LCS Dap(1L14008-BSD1) Prepared&Analyzed 12/13/01 <br /> Methyl tert-butyl ether(MTBE) 461 0 50 mg/m'Air 500 92 70-130 12 25 <br /> Surrogate Dibromofluoromethane 477 500 95 50-150 <br /> Surrogate 1 2-Dichloroethane-d4 473 500 95 50-150 <br /> quota Analytical-Sacramento The 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 9 of 10 <br />