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819 Striker Ave Ste 8 <br /> Sequoia S8Cieme916)92 -9600 <br /> (416}921 A60Q <br /> Analytical FAXequo labsca0 <br /> www sequoialsbs cam <br /> Ryan-Dublin Project Former Unocal 2859,Stockton,CA 5305466 <br /> Sierra Court,Ste J Project Number N/A Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 06/03/03 18 41 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lunn Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3060013-EPA 5030B PIT <br /> Blank(3060013-BLKI) Prepared&Analyzed 05/31/03 <br /> Tertbutyl alcohol ND 50 ug/l <br /> Methyl tertbutyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Tert-amyl methyl ether ND 050 " <br /> Ethanol ND 50 " <br /> 1,2-Diehloroethane ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> Surrogate 1,2-DCA-d4 261 250 104 60-140 <br /> Blank(3060013-BLK2) Prepared&Analyzed 06/02/03 <br /> tyl alcohol ND so ug/l <br /> ten-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Teri-amyl methyl ether ND 050 " <br /> Ethanol ND 50 <br /> 1,2-Dichloroethane ND 050 " <br /> 1,2-1)ibromoethane(EDB) ND 050 " <br /> Surrogate 1 1-DCA-d4 227 250 91 60-140 <br /> Laboratory Control Sample(3060013-BSI) Prepared&Analyzed 05/31/03 <br /> Methyl tert-butyl ether 228 050 ug/l 224 102 60-140 <br /> Surrogate 1,2-DCA-d4 274 250 110 60-140 <br /> Laboratory Control Sample(3060013-BS2) Prepared&Analyzed 06/02/03 <br /> Methyl tert-butyl ether 181 050 ugll 224 81 60-140 <br /> Surrogate 1 1-DCA-d4 236 250 94 60-140 <br /> Ia Analytical -Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> o 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 20 <br />