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Sequoia m819 Sinker Ave Ste 8 <br /> 5acrnento CA 95634 <br /> a) (9[6)921-9640 <br /> Analytical FAX(9[6)921-0100 <br /> www sequoialabs cam <br /> Gettler-Ryan-Petaluma Project Tosco 6981,Stockton,CA 5301510 • <br /> 1364 N McDowell Blvd Ste B2 Project Number N/A Reported <br /> Petaluma CA,94954 Project Manager Dave Vossler 02/06/03 18 15 <br /> GasolmelBTEXIOxygenates 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 3020058-EPA 5030B [P/T[ - - - - - - - - - — - <br /> Blank(3020058-BLKI) Prepared&Analyzed 02/05/03 <br /> Bettzene ND 0 50 ug/l <br /> Toluene ND 050 " <br /> Lthylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tent-butyl ether ND 050 " <br /> Gasoline(C6-C 10) ND 50 " <br /> Surrogate 12 DCA-d4 295 250 118 60-140 <br /> Stu rogate Toluene-d8 262 250 105 60-140 <br /> Surrogate 4-BFB 264 250 106 60-140 <br /> Laborato Control Sample(3020058-BSlj --—W �- _ Prepared&Analyzed 02/05/03 <br /> Benzene 11 1 0 50 ug/l 136 82 70-130 <br /> Toluene 642 0 50 834 77 70-130 <br /> Methyl tert-butyl ether 162 050 224 72 60-140 <br /> Gasoline(C6-C 10) 768 50 1100 70 70-130 <br /> Surrogate 11-DCA-d4 306 250 122 60-140 <br /> Surrogate Toluene-d8 263 250 105 60-140 <br /> Surrogate 4 BFB 270 250 108 60-140 <br /> Matnx Spike(3020058-MSI) Source 5301611-02 Prepared 02/05/03 Analyzed 02/06/03 <br /> Benzene 115 050 ug/l 136 ND 85 70-130 <br /> Toluene 73 0 050 834 ND 88 70-130 <br /> Methyl tert-butyl ether 23 1 050 224 53 79 60-140 <br /> Gasoline(C6-C 10) 819 50 1100 ND 74 60-140 <br /> Surrogate 12 DCA-d4 312 250 125 60-140 <br /> Surrogate Toluene-d8 262 250 105 60-140 <br /> Surrogate 4-BFB 261 250 104 60-140 <br /> Sequoia Analytical-Sacramento The results in this r eporl apply to the samples analysed in accordance with the chain of <br /> custody document Unless oiherst sse stated results are reported on a wet weight basis <br /> This analytical report must be rept oduced in its entirety 0 <br /> Page 4 of 6 <br />