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� 819 Striker Avenue Suite 8 <br /> Sequoia Sacramento CA 95834 <br /> (916)921-960096M <br /> FAX(916)921-0100 <br /> Analytical <br /> µn, W sequotalabs com <br /> Gettler-Ryan-Petaluma Project Tosco 6981,Stockton,CA 5210530 <br /> 1364 N McDowell Blvd Ste 132 Project Number N/A Reported <br /> Petaluma CA,94954 Project Manager Dave Vossler 11/07/02 16 03 <br /> GasollnelBTEXIOxygenates 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 2100443 -EPA 5030E [P/TJ <br /> Blank(2100443-BLK3) Prepared&Analyzed 11/04/02 <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-C10) ND 50 " <br /> Surrogate 1 2-DCA-d4 260 250 104 60-140 <br /> Suv rogate Toluene-d8 221 250 88 60-140 <br /> Surrogate 4-BFB 230 25 0 92 60-140 <br /> keonr'atory Control Sample(2100443-BSI) Prepared &Analyzed 10/29/02 <br /> 13 2 050 ug/l 134 99 70-130 <br /> 69 8 050 81 0 86 70-130 <br /> Methyl tert-butyl ether 230 050 21 8 106 60-140 <br /> Gasoline(C6-C10) 868 50 1100 79 70-130 <br /> Surrogate 1 2-DCA-d4 0 540 250 2 60-140 A-01 <br /> Surrogate Toluene-d8 ND 250 60-140 A-01 <br /> Sri rogate 4 BFB 00700 250 03 60-140 A-01 <br /> Laboratory Control Sample(2100443-BS2) Prepared&Analyzed 10/30/02 <br /> Benzene 15 8 050 ug/l 114 118 70-130 <br /> Toluene 807 050 81 0 100 70-130 <br /> Methyl tert-butyl ether 245 050 21 8 112 60 140 <br /> Gasoline(C6-C10) 1110 50 1100 101 70-130 <br /> i <br /> Suvtogate 12-DCA-d4 263 250 105 60-140 <br /> Surrogate Toluene d8 228 250 91 60-140 <br /> Surrogate 4-BFB 229 250 91 60-140 <br /> i <br /> uota Analytical-Sacramento The results in this report apply to the samples analyzed in accadance with il:e chair of <br /> custody document Thos analytical report must be v eptoduced in its encu ety <br /> Page 6 of 8 <br />