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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921 9600 <br /> FAX(916)921 0too <br /> r Analytical www sequoialabs com <br /> SECOR International-Rancho Cordova Protect Tosco 1205,Lathrop,CA <br /> 3017 Kilgore Road, Suite 100 Protect Number N/A Reported <br /> Rancho Cordova CA,95670 Protect Manager gusty Benkosky 12/04/02 17 35 <br /> GasohneWEXIOxygenates 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 2110236-EPA 5030B [PIT] <br /> Matrix Spike Dup(2110236-MSD1) Source 5211290-01 Prepared 11/15/02 Analyzed 11/16/02 <br /> Methyl tent-butyl ether 00452 00050 mg/kg 00436 ND 103 60-140 9 25 <br /> Benaene 0 02'79 00050 00268 ND 104 60-140 0-7 25 <br /> Toluene 0 180 00050 0 162 ND ill 60-140 7 25 <br /> Gasoline(C6-C10) 206 10 220 ND 94 60-140 8 25 <br /> Surrogate 12-DCA-d4 00495 00500 99 60-140 <br /> Surrogate Toluene-d8 00540 00500 108 60-140 <br /> Surrogate 4-BFB 00508 00500 102 60-140 <br /> Batch 2110263-EPA 5030B [MeOH] <br /> Blank(2110263-BLKI) Prepared&Analyzed 11/18/02 <br /> Ethanol ND 20 mg/kg <br /> Tert-butyl alcohol ND so " <br /> Methyl tert butyl ether 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 /> 1,2-Dibromoethane(EDB) ND 050 <br /> Benzene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> Gasoline(C6-C10) ND 100 " <br /> Surrogate 12-DCA-d4 242 2 50 97 60-140 <br /> Surrogate Toluene-d8 256 250 102 60-140 <br /> Surrogate 4-BFB 257 " 250 103 60-140 <br /> Sequoia Analytical- Sacramento The results in this report apply to the samples analyzed to accordance with the chain o/ <br /> custody document This analytical report must be reproduced in its entirety• <br /> Page Page 5 of 7 <br />