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819 Striker Ave Ste 8 <br /> Sacramento,CA 95834 <br /> 4DFAXSequoia (916)921-9600 <br /> r Analytical ww.equoi92 -0100 s.com <br /> -Ryan-Dublin Project: Former Unocal 0187,Stockton,CA S306048 <br /> 6 S <br /> ierra Court,Ste.J Project Number: N/A Reported: <br /> Dublin CA,94568 Project Manager: Deanna L.Harding 06/16/03 15:43 <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 3060057-EPA 5030BIP/TJ <br /> Blank(3060057-BLKI) Prepared&Analyzed:06/03/03 <br /> Tertbutyl alcohol ND 5.0 ug/l <br /> Methyl tert-butyl ether ND 0.50 " <br /> Di4sopropyl ether ND 0.50 " <br /> Ethyl tent-butyl ether ND 0.50 " <br /> Tett-amyl methyl ether ND 0.50 " <br /> Ethanol ND 50 " <br /> Surrogate:1.2-DCA-d4 13.2 11 25.0 93 60-140 <br /> Blank(3060057-BLK2) Prepared& Analyzed:06/04/03 <br /> Ten-butyl alcohol ND 5.0 ugll <br /> Methyl tert-butyl ether ND 0.50 " <br /> *ropyl ether ND 0.50 <br /> 'tt'nt-butyl ether ND 0.50 " <br /> Tert-amyl methyl ether ND 0.50 " <br /> Ethanol ND 50 " <br /> Surrogate:1.2-DCA-d4 16.2 25.0 105 60-140 <br /> Laboratory Control Sample(3060057-BSI) Prepared& Analyzed:06/03/03 <br /> Methyl ten butyl ether 21.6 0.50 ugA 22.4 96 60-140 <br /> Surrogate:1,2-DCA-d4 21.4 " 25.0 86 60-140 <br /> Laboratory Control Sarnle(3060057-BS2) Prepared&Analyzed: 06/04/03 <br /> Methyl tert-butyl ether 21.1 0.50 ug/l 22.4 94 60-140 <br /> Surrogate:1,2-DCA-d4 25.7 25.0 . 103 60-140 <br /> Batch 3060093-EPA 5030B JP/T] - <br /> Blank(3060093-BLKI) Prepared&Analyzed: 06/05/03 <br /> Tert-butyl alcohol ND 5.0 ugll <br /> I' <br /> Methyl tertbutyl ether ND 0.50 " <br /> Di-isopropyl ether ND 0.50 " <br /> oia Analytical - Sacramento The results in this report apply to the samples analysed 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 entirely. <br /> 1 <br /> Page 28 of 32 ] <br /> 3 <br />