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819 Stnker Ave Ste g <br /> / Sequoia Saciairte9to,CA 16)921-96 0 <br /> w Analytical (9uotala scom <br /> FAX(916)921-0100 <br /> www sequoialabs coin <br /> Gettler-Ryan-Dublin Project TOSCO 11192,Stockton,CA S305429 <br /> 6747 Sierra Court,Ste 1 Project Numb NIA Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 05/29/03 17 15 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lunit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3050466-EPA 5030B IP/TJ <br /> Blank(3050466-BLK1) Prepared&Analyzed 05/27/03 <br /> Tett-butyl alcohol ND 100 ugA <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> Tert-amyl methyl ether ND 20 " <br /> Ethanol ND 500 " <br /> l,2-Dlchloroethane ND 20 " <br /> 1,2-Dtbromoethane(EDB) ND 20 " <br /> Surrogate 12-DCA-d4 212 250 85 60-140 <br /> Blank(3050466-BLK2) Prepared&Anained 05/28/03 _ <br /> Tert-butyl alcohol ND 100 u9/1 <br /> Di-isopropyl ether ND 20 . <br /> Ethyl tert-butyl ether ND 20 " <br /> Tert-amyl methyl ether ND 20 " <br /> Ethanol ND 500 " <br /> 1,2-Dichlonoethane ND 20 " <br /> 1,2-Dtbromoethane(EDB) ND 20 " <br /> Surrogate 1,1-DCA-d4 260 250 104 60-140 <br /> Laboratory Control Sample(3050466-BSI) Prepared&Analyzed 05/27/03 <br /> Surrogate 12-DC4-d4 271 119/1 250 108 60-140 <br /> Laborator <br /> y Control Sample(3050466-BS2) Prepared&Analyzed 05/28/03 <br /> Surrogate 12-DCA-d4 256 u9/1 250 101 60-140 <br /> Batch 3050475-EPA 5030B [P/TJ <br /> Blank(3050475-BLK1) Prepared 05/27/03 Analyzed 05/28/03 <br /> Benzene ND 050 ugA <br /> Bromobenzene ND 050 <br /> Tert-butyl alcohol ND 100 " <br /> Bromochloromethane ND 050 " <br /> Bromodichloromethane ND 050 " <br /> Sequoia Analytical - Sacramento The results in this report apply to the samples analyzed in accordance with the chain <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 19 of 23 <br />