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819 Striker Avenue Suite 8 <br /> ® S e qu o i a - - Sacramento CA 95834 <br /> (916) 921-9600 <br /> Analytical <br /> FAX 921-0100 <br /> www sequoequoiala6s corn <br /> Gettler-Ryan-Petaluma Project Tosco 6981,Stockton,CA 5210530 <br /> 1364 N McDowell Blvd Ste B2 Project Number NIA Reported <br /> Petaluma CA,94954 Project Manager Dave Vossler 11/07/02 16 03 <br /> GasolinelBTEXIOxygenates by EPA method 8260B - Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Suurce %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2100443 -EPA 5030B (P/TJ <br /> Laboratory Control Sample(2100443-BS3) Prepared&Analyzed 11/04/02 <br /> Benzene 21 6 050 ug/l 250 86 70-130 <br /> Toluene 219 050 250 88 70-130 <br /> Methyl tert-butyl ether 224 050 250 90 60-140 <br /> Surrogate 12-DCA d4 240 500 48 60 140 <br /> Surrogate Toluene d8 217 500 43 60-140 <br /> Surrogate 4 BFB 210 500 41 60-140 <br /> Matrix Spike(2100443-MS1) Source 5210614-01 Prepared&Analyzed 10/29/02 <br /> Benzene 154 0 50 ug/I 13 4 ND 115 70-130 <br /> Toluene 715 0 50 81 0 1 1 87 70-130 <br /> Methyl tert-butyl ether 389 0 50 21 8 4 0 160 60-140 QM-07 <br /> Gasoline(C6-C10) 983 50 1100 ND 88 60-140 . <br /> Surrogate 1 2-DCA-d4 335 250 134 60-140 <br /> Surrogate Toluene-d8 268 250 107 60-140 <br /> Surrogate 4-BFB 233 250 93 60-140 <br /> Matrix Spike Dup(2100443-MSD]) Source 5210614-01 Prepared&Analyzed 10/29/02 <br /> Benzene 156 050 ug/l 13 4 ND 116 70-130 1 25 <br /> Toluene 744 0 50 81 0 1 1 90 70-130 4 25 <br /> Methyl tert-butyl ether 366 050 21 8 4 0 150 60-140 6 25 QM-07 <br /> Gasoline(C6-Cl0) 1030 50 1100 ND 93 60-140 5 25 <br /> Surrogate 12-DCA-d4 346 250 138 60-140 <br /> Surrogate Toluene-d8 280 250 112 60-140 <br /> Surrogate 4-BFB 234 250 94 60-140 <br /> Sequoia Analytical-SaCramento The results in this report apply to the samples analyzed in accordance with the chain <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 7 of 8 <br />