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819 Sinker Ave Ste 8 <br /> gz— Sequoia Sacramento CA 95834 <br /> (916)92t-9600 <br /> Analytical wFAX(916)labs°no <br /> o <br /> Gettler-Ryan-Petaluma Project Former Tosco 6981, Stockton,CA S212553 <br /> 1364 N McDowell Blvd Ste B2 Project Number N/A Reported <br /> Petaluma CA,94954 Project Manager Dave Vossler 01/08/03 17 07 <br /> Gasollne\BTEXIOxygenates by EPA method 8260B - Quality Control <br /> Sequoia Analytical -Sacramento <br /> Reporting Spike Source %R-EC RpD <br /> Analyte Result Limit Units Level Result %RFC Limits RPD Limit Notes <br /> Batch 2120497-EPA 5030B [PIT] <br /> Blank(2120497-BLKI) Prepared&Analyzed 12/31/02 <br /> Benzene ND 030 ugll <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> Surrogate 12-DCA-d4 276 250 110 60-140 <br /> Surrogate Toluene d8 257 250 103 60-140 <br /> Surrogate 4-BFB 249 250 100 60-140 <br /> Laboratory Control Sample(2120497-BSI) Prepared&Analyzed 12/31/02 <br /> Benzene 12 8 050 ugll 13 6 94 70 130 <br /> Toluene 755 050 834 91 70-130 . <br /> Methyl tert-butyl ether 175 050 224 78 60-140 <br /> Surrogate 12-DCA-d4 279 2.50 112 60-140 <br /> Suirogate Toluene-d8 263 250 105 60-140 <br /> Surrogate 4 BFB 248 250 99 60-140 <br /> Matrix Spike(2120497-MSI) Source S212663-04 Prepared&Analyzed 12/31/02 <br /> Benzene 117 050 ugll 136 ND 86 70-130 <br /> Toluene 68 6 050 834 ND 82 70-130 <br /> Methyl tert butyl ether 177 050 224 ND 77 60-140 <br /> Surrogate 12-DCA-d4 299 250 120 60-140 <br /> Surrogate Toluene-d8 253 2.50 101 60-140 <br /> Surrogate 4-BFB 246 250 98 60-140 <br /> Matrix Spike Dnp(2120497-MSD1) Source S212663-04 Prepared&Analyzed 1213I102 <br /> Benzene 127 050 ug/1 136 ND 93 70-130 B 25 <br /> Toluene 762 050 834 ND 91 70-130 10 25 <br /> Methyl tert butyl ether 200 050 224 ND 87 60-140 12 25 <br /> Surrogate 12-DCA-d4 314 250 126 60-140 <br /> Surrogate Toluene-d8 258 250 103 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> cusiodv document Unless otherwise stated results are i eported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 7 of 10 <br />