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• Sinker Ave Ste 8 <br /> Sequoia Sacramento CA 95834 <br /> (916)921 9600 <br /> a— )► Analytical ' FAX(916)921010o <br /> WWW sequolalabs com <br /> SECOR International-Rancho Cordova Project TOSCO 11193,Stockton,CA 5304255 <br /> 3017 Kilgore Road,Suite 100 Project Number N/A r Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 04/29/03 0111 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality, Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result I Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3040319-EPA 5030B[P/TJ <br /> Blank(3040319-BLK1) Prepared&Analyzed 04/18/03 <br /> Tert-butyl alcohol ND 100 ugll <br /> Methyl tert-butyl ether ND 2 0 " <br /> Di-isopropyl ether ND 2 0 " <br /> Ethyl tert-butyl ether ND 2 0 " <br /> Tert-amyl methyl ether ND 2 0 " <br /> Ethanol ND 500 " <br /> 1,2-Dichloroethane ND 2 0 " <br /> 1,2-Dibromoethane(EDB) ND -20 <br /> Surrogate 12-DCA-d4 260 25 0 104 60-140 <br /> Blank 3040319-BLK2 Prepared&Analyzed 04/19/03 <br /> Tert-butyl alcohol ND 100 ugtl <br /> Methyl tert-butyl ether ND 2 0 " <br />,-`..Di-isopropyl ether- _ —�---- — --- ND -�� _ 2 0---"-- - — - - - -- - -- -- —,- <br /> Ethyl tert-butyl ether ND 2 0 " <br /> Tert-amyl methyl ether ND 2 0 " <br /> Ethanol ND 500 " <br /> 1,2-Dichloroethane ND 2 0 " <br /> t,2-Dibromoethane(EDB) ND 2 0 " <br /> Surrogate 12-DCA-d4 32 0 25 0 128 60-140 <br /> Laboratory Control Sample(3040319-BSI) Prepared&Analyzed 04/18/03 <br /> Methyl tert-butyl ether IS 2 2 0 ugll 22 4 81 60-140 <br /> Surrogate 12-DCA-d4 28 9 25 0 116 60-140 <br /> Laboratory Control Sample 3040319-BS2 Prepared 04/19/03 Analyzed 04/20/03 <br /> Methyl tert-butyl ether 27 0 2 0 ug/l 22 4 121 60-140 <br /> Surrogate 1 2-DCf1-d4 33 7 25 0 135 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 Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 16 of 19 <br />