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n <br /> Sequoia 819 Sinker Ave Ste 8 <br /> SdLrdnlrillU CA 95834 <br /> (916)921 9600 <br /> Analytical FAX(916)921 0100 <br /> i www sequaialabs cam <br /> Gettler-Ryan-Petaluma Project Tosco 6981,Stockton,CA _ _ _ 5307497 <br /> 1364 N McDowell Blvd Ste B2 Project Number NIA � ~" � Reported- <br /> Petaluma CA,94954 Project Manager_Dave Vossler 08/05/03 18 35 _ <br /> Gasoline\BTEX1Oxygenates by EPA method 8260B- Quality Control <br /> Sequoia Analytical- Sacramento f <br /> __Reporting Spike __ Source _%REC _RPp <br /> Analyte Result - - Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3080034-EPA 5030B JP/TJ <br /> Blank(3080034-BLKI) Prepared 08/04/03 Analyzed 08/05/03 <br /> Benzene ND 050 ug/l <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tent-butyl ether ND 20 " <br /> Gasoline(C6-C10) ND 50 " <br /> Sun agate Toluene-d8 251 25 0 100 60-140 <br /> Sun ogate 4-BFB 262 25 0 105 60-140 <br /> Laboratory Control Sample(3080034-BSI) Prepared 08/04/03 Analyzed 08/05/03 <br /> -- Benzene 3 17---- 0 50—ug/1-_ 320---- 99- - 70-130_ - <br /> Toluene 18 1 0 50 14 8 122 70-130 . <br /> Methyl tert-butyl ether 534 20 496 108 60-140 <br /> Gasoline(C6-C10) 195 50 220 89 70-130 <br /> Sunagate Toluene-d8 15 2 25 0 101 60-140 <br /> Surrogate 4-BFB 260 250 104 60-140 <br /> Matrix Spike(3080034-MSI) Source 5307514-02 Prepared&Analyzed 08/05/03 <br /> Benzene 3 12 050 ug/l 320 ND 97 70-130 <br /> Toluene 17 8 050 148 ND 120 70-130 <br /> Methyl ter!-butyl ether 5 94 20 ----456 0 96 100 60 140 <br /> Gasoline(C6-C10) 196 50 220 ND 89 60-140 <br /> Surrogate Toluene-d8 252 250 101 60-140 <br /> Surrogate 4-BFB 260 25 6 104 60-140 <br /> Matrix Spike Dup(3080034-MSDI) Source S307514-02 Prepared&Analyzed 08/05/03 <br /> Benzene 278 0 50 ug/I 320 ND 87 70-130 12 25 <br /> Toluene 17 2 0 50 14 8 ND 116 70-130 3 25 <br /> Methyl tert-butyl ether 572 20 496 096 96 60-140 4 25 <br /> Gasoline(C6 C10) 191 50 220 ND 87 60-140 3 25 <br /> Surrogate Toluene-d8 260 .250 104 60-140 <br /> Surrogate 4-BF8 25 2 250 101 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to thesamples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are repos fed on a wet weight basis <br /> This analytical report must be reproduced in its entir eh, <br /> Page 4 of 5 <br />