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819 Sinker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> 4D (916)921-9600 <br /> JW Analytical FAX(916)921-0100 <br /> www sequoialabs com <br /> SECOR International-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 07/02/02 16 44 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2F30002-EPA 5030B PIT <br /> Blank(2F30002-BLK1) Prepared&Analyzed 06/30/02 _ <br /> Ethanol ND 40 ug/l <br /> tert-Butyl alcohol ND 20 " <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 /> Ethylene dibromide ND 050 " <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Etbylbenzene ND 0 50 " <br /> Total Xylenes ND 0 50 " <br /> Wsohne Range Organics(C6-C10) ND 50 u� <br /> Surrogate 1 2-Dichloroethane-d4 553 500 if] 60-140 <br /> LCS(21730002-BS1) Prepared&Analyzed 06/30/02 <br /> Methyl tert-butyl ether 101 0 50 ug/1 10 0 101 70-130 <br /> Benzene 980 050 " 10 0 980 70-130 <br /> Toluene 9 21 050 100 92 1 70-130 <br /> Surrogate 1 2-Dichloroethane-d4 542 5 00 108 60-140 <br /> LCS(2F30002-BS2) _ Prepared&Analyzed 06/30/02 <br /> Methyl tert-butyl ether 945 050 119/1 840 112 70-130 <br /> Benzene 534 050 528 101 70-130 <br /> Toluene 31 1 050 31 8 97 8 70-130 <br /> Gasoline Range Organics(C6-00) 372 50 440 845 70-130 <br /> Surrogate 1 2-Dichloroethane-d4 544 500 109 60-140 <br /> �uola 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 4 of 6 <br />