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819 Striker Ave Ste S <br /> rarnento,CA <br /> 4DqW Sequoia S= (916)921-9958346W <br /> Analytical ww.e96)9abs.co0 <br /> www.aequoiatabs.com <br /> 9 <br /> Gettler-Ryan-Dublin Project: Unocal 0187,Stockton,CA S309436 <br /> 6747 Sierra Court,Ste.J Project Number: N/A Reported: <br /> Dublin CA,94568 Project Manager: Eric Jansen 09/30/03 17:40 <br /> Gasoline\BTEXlOxygenates by EPA method 8260B- Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike So,n'ce %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3090318-EPA 5030B PIT <br /> Blank(309031$-BLK1) Prepared:09/24/03 Analyzed:09/25/03 <br /> Bene ND 0.50 ug/1 <br /> Toluene ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Xylenes(total) ND 0.50 „ <br /> Methyl tert-butyl ether ND 0.50 " <br /> Gasoline(C6-C10) ND 50 " <br /> surrogate:1,2-DCA-d4 20.9 25.0 84 60-140 <br /> Surrogate:Toluene-d8 22.7 25.0 91 60-140 <br />! <br /> Surrogate:4-BFB 19.9 25.0 80 60-140 <br /> i <br /> Blank(3090318-BLK2) Prepared&Analyzed:09/25/03 <br /> Benzene ND 0.50 ug/l <br /> Wluene ND 0.50 " <br /> hylbenzene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Gasoline(C6-C10) ND 50 " <br /> Surrogate:1,2-DCA-d4 20.6 25.0 81 60-140 <br /> Surrogate:Toluene-d8 21.8 25.0 87 60-140 <br /> Surrogate:4-BFB 20.0 25.0 80 60-140 <br /> Laboratory Control Sample(3090318-BSI) Prepared: 09/24/03 Analyzed:09/25/03 <br /> Benzene 2.77 0.50 ug/l 3.20 87 70-130 <br /> Toluene 16.9 0.50 14.8 114 70-130 <br /> Methyl tert-butyl ether 4.01 0.50 4.96 81 60-140 <br /> Gasoline(C6-CIO) 205 50 220 93 70-130 <br /> Surrogate:l,2-PCA-d4 20.9 15.0 84 60-140 <br /> Surrogate:Toluene-d8 22.3 25.0 89 60-140 <br /> Surrogate:4-BFB 20.3 25.0 81 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 6 of 8 <br /> .i <br />