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819 Sinker Ave Ste 8 <br /> Sequoia CA 95834 <br /> (916)921-9600 <br /> a)— <br /> FAX(916)921-0100 <br /> Analytical www sequoialabs Com <br /> Ryan-Dublin Project TOSCO 11192,Stockton,CA S305429 <br /> Sierra Court,Ste d Project Number 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 Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3050475-EPA 5030B [PIT <br /> Blank(3050475-BLKI) Prepared 05/27/03 Analyzed 05/28/03 <br /> Di-isopropyl ether ND 20 ug/l <br /> Bromoform ND 050 to <br /> Ethyl tertbutyl ether ND 20 " <br /> Bromomethane ND 10 " <br /> Teri-amyl methyl ether ND 20 to <br /> Ethanol ND 500 " <br /> n-Butylbenzene ND 050 " <br /> 1,2-Dichlomethane ND 20 " <br /> sec-Butylbenzene ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 20 " <br /> ten-Butylbenzene ND 050 to <br /> Carbon tetrachloride ND 050 " <br /> benzene ND 050 <br /> thane ND 050 to <br /> Chloroform ND 050 " <br /> Chloromethane ND 050 " <br /> 2-Chlorotoluene ND 050 " <br /> 4-Chlorotoluene ND 050 " <br /> Dibromochloromethane ND 050 " <br /> 1,2-Dibromoohane(EDB) ND 050 " <br /> Dibromomethane ND 050 <br /> 1,2-Dibromo-3-chloropropane ND 10 " <br /> 1,2-Dichlorobenzene ND 050 " <br /> 1,3-Dichlorobenzene ND 050 " <br /> 1,4-Dichlorobenzene ND 050 " <br /> Dichlorodifluoromethane ND 050 " <br /> 1,1-Dichloroethane ND 050 to <br /> 1,2-Dichloroethane ND 050 " <br /> 1,1-Dichloroethene ND 050 " <br /> cis-1,2-Dichloroethene ND 050 " <br /> trans-1,2-Dichloroethene ND 050 to <br /> 1,2-Dichloropropane ND 050 " <br /> 1,3-Dichloropropane ND 050 " <br /> 2,2-Dichloropropane ND 050 " <br /> $J-Dichloropropene ND 050 " <br /> Ethylbenzene ND 050 " <br /> ora 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 20 of 23 <br />