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819 Striker Ave Ste 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical <br /> FAX(916)921-0100 <br /> www.sequoialabs.00m <br /> Gettler-Ryan-Dublin Project: Former Unocal 0187,Stockton,CA S306048 <br /> 6747 Sierra 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 3060093-EPA 5030B[P/TJ <br /> Blank(3060093-BLKI) Prepared&Analyzed:06/05/03 <br /> Ethyl tert-butyl ether ND 0.50 usA <br /> Tert-amyl methyl ether ND 0.50 " <br /> Ethanol ND 50 <br /> Surrogate.1,1-DCA-d4 15.1 15.0 101 60-140 <br /> Laboratory Control Sample(3060093-BSI) Prepared&Analyzed_:0_6_/05/03 <br /> Methyl tett-butyl ether - 19.6 0.50 ug/l 22.4 88 60-140 �- <br /> Surrogate:1,2-DCA-d4 26.2 25.0 105 60-140 <br /> Batch 3060110-EPA 5030B JP/T <br /> Blank(3060110-BLKI) Prepared&Analyzed. 06/06/03 <br /> Tert-butyl alcohol ND 5.0 u9A <br /> Methyl tert-butyl ether ND 0.50 " <br /> Di-isopropyl ether ND 0.50 " <br /> Ethyl tent-butyl ether ND 0.50 " <br /> Tert-amyl methyl ether ND 0.50 " <br /> Surrogate:1,2-DCA-d4 15.3 .25.0 101 60-140 <br /> Laboratory Control Sample(3060110-BSI) Prepared_ &Analyzed: 06/06/03 _ <br /> Methyl tert-butyl ether 21.1 0.50 ug/l 22.4 94 60-140 <br /> Surrogate:1,2-DCA-d4 16.0 15.0 104 60-140 <br /> Batch 3060167-EPA 5030E JPrrJ <br /> Blank(3060167-BLKI) Prepared&Analyzed: 06/11/03 <br /> Tert-butyl alcohol ND 5.0 ug/l <br /> Methyl tert-butyl ether ND 0.50 " <br /> Di-isopropyl ether ND 0.50 " <br /> Ethyl tert-butyl ether ND 0.50 " <br /> Ten-amyl methyl ether ND 4.50 " <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 he reproduced in its entirety. <br /> Page 29 of 32 <br />