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_ 819 Striker Ave Ste 8 <br /> 4D Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921.0I00 <br /> www.sequoialabs.com <br /> Gettier-Ryan-Dublin Project: Former Unocal 0187,Stockton,CA S306048 <br /> 6747 Sierra Court,Ste.7 Project Number: NIA Reported: <br /> Dublin CA,94568 Project Manager: Deanna L.Harding 06/16/03 15:43 <br /> Volatile Organic Compounds by EPA Metbod 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 3060184-EPA 5030B JP/Tl <br /> Blank(3060184-BLK3) Prepared&Analyzed: 06/13/03 <br /> Tert-butyl alcohol -! �ND 5.0 ugJl <br /> Methyl tert-butyl ether ND 0.50 IF <br /> Di-isopropyl ether ND 0.50 <br /> Ethyl ten-butyl ether ND 0.50 IF <br /> Tert-amyl methyl ether ND 0.50 IF <br /> Ethanol ND 50 " <br /> Surrogate:1,1-DCA-d4 11.8 25.0 91 60-140 <br /> Laboratory Control Sample(3060184-BSI) Prepared&Analyzed:06/11/03 <br /> Methyl ten-butyl ether 18.6 0.50 ug,9 22.4 83 60-140 <br /> Surrogate:1,2-DCA-d4 16.9 IF 15.0 108 60-140 <br /> Laboratory Control Sample(3060184-BS2) Prepared&Analyzed: 06/12/03 _ <br /> Methyl tert-butyl ether 19.8 0.50 ug/l 22.4 88 60-140T <br /> Surrogate:1,2-DCA-d4 23.0 IF25.0 91 60-140 <br /> Laboratory Control Sample(3060184-BS3) Prepared&Analyzed: 06/13/03 <br /> Methyl ten-butyl ether 16.4 0.50 ug/l 22.4 73 60-140 <br /> Surrogate:1,2-DCA-d4 14.6 IF15.0 98 60-140 <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 analyrical report must be reproduced in its entirety. <br /> Page 31 of 32 <br />