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819 Sinker Avenue Smte 8 <br /> a_ _� SCC]l101a Sacramento CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www sequoialabs com <br /> SECOR International-Rancho Cordova Project TOSCO 8671,Stockton,CA <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 01/23/02 17 08 <br /> Volatile Organic Compounds 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 2010188-EPA 5030B JPIT] <br /> Blank 2010188-BLKI) Pre ared&Analyzed 01/16/02 <br /> Tert-butyl alcohol ND 5 0 ug/I <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 /> Ethanol ND 50 " <br /> 1,2-Dichloroethane ND 0 50 " <br /> Ethylene dibromide ND 050 " <br /> Surrogate 12-DCA-d4 24 7 250 988 60-140 <br /> LCS(2010188-11SI) Prepared&Analyzed 01/16/02 <br /> Methyl tert-butyl ether 25 4 0 50 ug/l 25 0 102 60-140 <br /> Ourrogate 1 2-DCA-d4 242 250 968 60-140 <br /> Matrix Spike(2010188-MS1) Source S201099-06 Prepared&Analyzed 01/16/02 <br /> Methyl ter-butyl ether 21 2 0 50 ug/1 25 0 ND 948 60-140 <br /> Surrogate 12-DCA-d4 228 11 25 0 912 60-140 <br /> Matrix Spike Dup(2010188-MSD1) Source S201099-06 Prepared&Analyzed 01116/_02 <br /> Methyl tert-butyl ether 226 050 1.19/1 25 0 ND 904 60-140 6 39 25 <br /> Surrogate 1 2-DCA-d4 250 11 250 100 60-140 <br /> 0 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 5 of 6 <br />