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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento�i)195834 <br /> * (916))921-9600 Ana y1 Ca! FAX equoi921-0100 <br /> www sequoialabs corn <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-BLKI) 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 0 50 " <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 /> Ethylbenzene ND 050 " <br /> Total Xylenes ND 050 " <br /> asoline Range Organics(C6-C10) ND 50 " <br /> urrogate 11-Dichloroethane-d4 553 500 111 60-140 <br /> LCS(2F30002-BS1) Prepared&Analyzed 06/30/02 <br /> Methyl tert-butyl ether 101 050 u9/1 100 101 70-130 <br /> Benzene 980 050 100 98 0 70-130 <br /> Toluene 9 21 050 100 92 1 70-130 <br /> Surrogate 12-Dichloroethane-d4 542 500 108 60-140 <br /> LCS(2F30002-BS2) ___ Prepared&Analyzed 06/30/02 <br /> Methyl tert-butyl ether 945 050 ug/l 840 112 70-130 <br /> Benzene 5 34 0 50 5 28 101 70 130 <br /> Toluene 31 1 050 31 8 978 70-130 <br /> Gasoline Range Organics(C6-C10) 372 50 440 84 5 70-130 <br /> Surrogate 12-Dichloroethane-d4 5 44 5 00 109 60-140 <br /> Sequoia 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 />