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819 Sinker Avenue Suite 8 <br /> Sequoia Sacramento CA 95834 <br /> 4D (916)921 9600 <br /> iW Analytical FAX(916)92 1-0100 <br /> WWW sequoialabs com <br /> SECOR]nternatlonal-Rancho Cordova Project Tosco 1205,Lathrop,CA <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 12/04/02 17 35 <br /> GasolinelBTEXIOxygenates by EPA method 8260B- Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPL) <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2110263-EPA 5030B [MeOHJ <br /> LCS(2110263-BSI) Prepared&Analyzed 11/18/02 <br /> Methyl tert-butyl ether 374 050 mg/kg 327 IN 60-140 <br /> Benzene 2 14 050 201 106 70-130 <br /> Toluene 119 050 122 98 70 130 <br /> Gasoline(C6-C 10) 125 100 165 76 70-130 <br /> Surrogate 1 2-DC.4-d4 261 250 104 60-140 <br /> Surrogate Toluene-d8 156 250 102 60-140 <br /> Surrogate 4-BFB 270 250 108 60-140 <br /> LCS Dup(2110263-BSD1) Prepared&Analyzed 11/18/02 <br /> Methyl tert-butyl ether 344 050 mg/kg 3 27 105 60-140 8 25 <br /> Benzene 205 050 201 102 70-130 4 25 <br /> Toluene 117 050 122 96 70-130 2 25 <br /> Gasoline(C6-C10) 115 100 165 70 70-130 8 25 <br /> 12-DCA-d4 241 250 96 60-140 <br /> et'r'r.ogate <br /> gate Toluene-d8 252 250 101 60-140 <br /> Surrogate 4-BFB 257 250 103 60-140 <br /> SeSequoia 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 in its entirety <br /> Page Page 6 of 7 <br />