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S 19 Stntcer AN a Ste 8 <br /> Sequoia Sacramento CA 95834 <br /> ' (916)921 9600 <br /> iW Analytical FAX(916)92 1-0100 <br /> www sequotalabs corn <br /> Gettler-Ryan-Petaluma 0 <br /> Project Tosco 6981,Stockton,CA 5302524 <br /> 1364 N McDowell Blvd Ste B2 Project Number NIA Reported T <br /> Petaluma CA,94954 Project Manager Dave Vossler 03/07/03 16 58 <br /> Gasohne1BTEX)tOxygenates 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 3030052-EPA 5030E [P/Tl - - - — - - -- - - - <br /> Blank(3030052-BLK7) Prepared&Analyzed 03/05/03 <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 2 0 <br /> Gasolme(C6-C 10) ND 50 " <br /> Surrogate Toluene-d8 274 250 110 60-140 <br /> Surrogate 4-BFB 24 3 250 97 60-140 <br /> Blank(3030052-BLK.2) _ _ _ —_Prepared&Analyzed 03/06103-_ _-__ <br /> Benzene ND 0 50 ug/l <br /> Toluene ND 0 50 <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert butyl ether ND 2 0 " <br /> Gasoline(C6-Cl0) ND 50 <br /> Surrogate Toluene-d8 275 250 110 60-140 <br /> Surrogate 4-BFB 256 2.50 102 60-140 - <br /> Laboratory Control Sample(3030052-BS1) Prepared&Analyzed 03/05/03 <br /> Benzene 146 050 ug/l 13 6 107 70-130 <br /> Toluene 86 5 050 83 4 104 70-130 <br /> Methyl tert-butyl ether 22 0 2 0 22 4 98 60-140 <br /> Gasoline(C6-C10) 1150 50 1 100 105 70-130 <br /> Surrogate Toluene-d8 270 25 0 108 60-140 <br /> Surrogate 4-BFB 274 25 0 110 60-140 <br /> Laboratory Control Sample(3030052-BS2) Prepared&Analyzed 03/06/03 <br /> Benzene 13 8 050 ug/l 13 6 101 70-130 <br /> Toluene 80 1 050 83 4 96 70-130 <br /> Methyl tert-butyl ether 21 6 2 0 224 96 60-140 <br /> Gasoline(C6-Cl 0) 1010 50 1100 92 70-130 <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 he reproduced in its entirety <br /> Page4 of _ <br />