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819 Striker Avenue,Suite 8 <br /> 1 (916Segl101a Sacramento,CA 95834 <br /> �D- Analytical FAX <br /> )921-9600 <br /> {916}921-0100 <br /> www sequoialabs com <br /> SEGOR lntemational-Rancho Cordova Project Tosca 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 %RFC Limits RPD Limit Notes <br /> Batch 2F30002-EPA 5030B P/T <br /> Blank(2F30002-BLK1) _ Prepared&Analyzed 06/30/02 <br /> Ethanol ND 40 ugfl _— <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 0 50 " <br /> tert-Amyl methyl ether ND 0 50 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethylene dibromide ND 050 " <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 0 50 " <br /> Total Xylenes ND 0 50 " <br /> gmii�Gasoline Range Organics(C6-C10) ND 50 " <br /> urrogate 12-Drchloroethane-d4 5 53 5 00 111 60-140 <br /> LCS(2F30002-BSI) Prepared&Analyzed 06/30/02 _ <br /> Methyl tert-butyl ether 10 1 050 ug/l 100 101 70-130 <br /> Benzene 9 80 0 50 10 0 98 0 70-130 <br /> Toluene 921 0 50 100 92 1 70-130 <br /> Surrogate 12-Drchloroethane-d4 5 42 5 00 108 60-140 <br /> LCS(2F30002-BS2) Prepared&Analyzed 06/30/02 <br /> Methyl tert-butyl ether 9 45 0 50 ug/l 840 112 70-130 <br /> Benzene 5 34 050 " 528 101 70-130 <br /> Toluene 31 1 0 50 31 8 97 8 70-130 <br /> Gasoline Range Organics(C6-C10) 372 50 440 84 5 70-130 <br /> Surrogate 12-Drchloroethane-d4 544 Soo 109 60-140 <br /> equoia 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 />