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(D- <br /> 819 Striker Ave Ste 8 <br /> Sequoia Sacramento CA 95834 <br /> (916)921 9600 <br /> Analytical FAX(916)921-0100 <br /> J www sequoialabs com <br /> 71364 <br /> ler-Ryan-Petaluma Project Tosco 11192,Stockton,CA S212192 <br /> N McDowell Blvd Ste B2 ProjectNumber NIA Reported <br /> luma CA,94954 Project Manager Dave Vossler 12/20/02 14 03 <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 2120184-EPA 5030B PIT] <br /> Blank(2120784-BLK1) Prepared 12/13/02 Analyzed 12/14/02 <br /> Tert-butyl alcohol ND 0 050 mg/kg <br /> Methyl tert-butyl ether ND 00050 " <br /> Di-isopropyl ether ND 00050 " <br /> Ethyl tert-butyl other ND 00050 " <br /> Tert-amyl methyl ether ND 00050 " <br /> Ethanol ND 020 " <br /> 1,2-13rchlorocthane ND 00050 " <br /> 1 2-Dibromoethane(EDB) ND 00050 " <br /> Surrogate 12-DCA-d4 00483 00.500 97 60-140 <br /> Blank(2120184-BLK2) Prepared&Analyzed 12/16/02 <br /> 0thbutyl alcohol ND 0 050 mg/kg <br /> y/tert butyl ether ND 00050 " <br /> Di-isopropyl ether ND 00050 " <br /> Ethyl ten-butyl ether ND 00050 " <br /> Tert-amyl methyl ether ND 00050 <br /> Ethanol ND 020 <br /> 12-Dichloroethane ND 00050 " <br /> 1,2-Dibromoethane(EDB) ND 00050 <br /> Surrogate 12-DCA-d4 00431 00500 86 60-140 <br /> Laboratory Control Sample(2120184-BSI) Prepared 12/13/02 Analyzed 12/14/02 <br /> Methyl tert-butyl ether 00500 00050 mg/kg 00500 100 60-140 <br /> Surrogate 1 2-DCA-d4 00481 00500 96 60-140 <br /> Laboratory Control Sample(2120184-BS2) _ Prepared 12/12/02 Analyzed 12/14/02 <br /> Methyl tert-butyl ether 00399 00050 mglkg 00448 89 60-140 <br /> Surrogate 12-DCA-d4 00480 00500 96 60-140 <br /> quota Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 7 of 10 <br />