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i- <br /> 819 Striker Ave Ste 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> a_ _� <br /> Analytical FAX(916)921-010U <br /> www.sequoialabs.com <br /> i <br /> Gettler-Ryan-Dublin Project: Former Unocal 0187,Stockton,CA S309067 <br /> 6747 Sierra Court,Ste.] Project Number: NIA Reported: <br /> Dublin CA,94568 Project Manager: Deanna L.Harding 09/15/03 16:39 <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 3090075-EPA 5030B [P/TJ <br /> Laboratory Control Sample(3090075-BSI.) Prepared&Analyzed: 09/05/03 <br /> Methyl cert-butyl ether 20.1 0.50 ug/1 24,8 81 60-140 <br /> Surrogate: 1,2-DCA-d4 10.9 25.0 84 60-140 <br /> Matrix_Spike(3090075_-MSI) _ Source:S309083-01 Prepared&Analyzed. 09/05/03 <br /> Methyl tert-butyl ether 20.7 0.50 ug/l 24.8 ND 83 60-140 <br /> Surrogate:1,2-DCA-d4 . 21.6 15.0 86 60-140 <br /> Matrix Spike Dup(3090075-MSDI) Source:S309083-01 Prepared&Analyzed:09/05/03 <br /> Methyl tert-butyl ether 20.0 0.50 ug/1 24.8 ND 81 60-140 3 25 <br /> Surrogate:1,2-DC444 22.7 25.0 91 60-140 <br /> Batch 309008.1 -EPA 5030B JP/T] _ <br /> Blank(3090081-BLKI) Prepared&Analyzed: 09/05/03 <br /> Tert-butyl alcohol ND 5.0 ug/I <br /> Methyl tert-butyl ether ND 0.50 " <br /> Di-isopropyl ether ND 0.50 " <br /> Ethyl tert-butyl ether ND 0.50 " <br /> Tert-amyl methyl ether ND 0.50 " <br /> Surrogate:1,2-DCA-d4 22.4 15.0 90 60-740 <br /> Laboratory Control Sample(3090081-BS1) Prepared&Analyzed: 09/05/03 <br /> Methyl tert-butyl ether 23.1 0.50 ug/1 25.0 92 60-140 <br /> Surrogate:1,2-DCA-d4 21.8 15.0 87 60-140 <br /> Matrix Spike(3090081-MSI) Source:5309067-10 Prepared&Analyzed: 09/05/03 <br /> Methyl tert-butyl ether 21.2 0.50 ug/l 25.0 ND 85 60-140 <br /> Surrogate:1,2-DCA-d4 22.0 25.0 88 60-140 <br /> Sequoia 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 27 of 29 <br />