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r <br /> te 9 <br /> Sequoia $1amenterAve5834 <br /> Sucmmento CA 95$34 <br /> Analytical (916)921 9600 <br /> FAX(416 921 0]00 <br /> www sequmalabs coni <br /> Gertler-Ryan-Petaluma Project Tosco 6981,Stockton,CA 5305526 <br /> 1364 N McDowell Blvd Ste 132 Project Number N/A Reported <br /> Petaluma CA,94954 Project Manager Dave Vossler 06/04/03 17 28 <br /> _ Gasohne\BTE_XlOxygenates 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 3060024-EPA 5030B(P/TJ — — - - - <br /> Blank(3060024-BLK1) Prepared&Analyzed 06/02/03 <br /> Benzene ND 050 ug/l <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert butyl ether ND 050 " <br /> Gasoline(C6-CIO) ND 50 " <br /> Surrogate 12 DCA-d4 227 250 91 60-140 <br /> Surrogate Toluene-d8 254 25 0 102 60-140 <br /> Surrogate 4 BFB 23 1 250 92 60-140 <br /> v � Blank(3060024-BLK2) � �YW W_-_-- Prepared&Analyzed 06/03/03 <br /> Benzene ND 050 ugll <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert butyl ether ND 050 " <br /> Gasoline(C6 C10) ND 50 " <br /> _ Surrogate 12 DCA d4 _ 23 2 250 _ v _ 93 _ 60-140 <br /> Surrogate Toluene d8 243 25 0 97 60-140 <br /> Surrogate 4-BFB 222 250 89 60-140 <br /> Laboratory Control Sample(3060024-BSI) Prepared&Analyzed 06/02/03 <br /> Benzene 121 050 ug/1 13 6 89 70-130 <br /> Toluene 775 050 83 4 93 70-130 <br /> Methyl tert butyl ether 181 050 224 81 60-140 <br /> Gasoline(C6-C10) 1000 50 1100 91 70 130 <br /> Surrogate 1 2-DCA44 236 250 94 60-140 <br /> Surrogate Toluene-d8 251 25 0 100 60-140 <br /> Surrogate 4-BFB 23 7 25 0 95 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 4of6 <br />