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819 Striker Avenue Suite 8 <br /> Sequoia W - Sacramento CA 95814 <br /> (916)921-9600 <br /> FAX(916)921-0100 <br /> �Qr 0 <br /> Analytical www sequolalabs com <br /> Gettler-Ryan-Petaluma Project Tosco 6981, Stockton,CA S210530 <br /> 1364 N McDowell Blvd Ste B2 Protect Number NIA Reported <br /> Petaluma CA,94954 Project Manager Dave Vossler 11/07/02 16 03 <br /> Gasollnc\BTEXIOxygenates by EPA method 8260B- Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPC] <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2100435-EPA 5030B JP/TJ <br /> Matrix Spike Dup(2100435-MSD1) Source 5210478-01 Prepared&Analyzed 10/29/02 <br /> Benzene 148 050 ug/l 134 ND 110 70-130 07 25 <br /> Toluene 777 050 81 0 ND 96 70-130 3 25 <br /> Methyl tent-butyl ether 261 050 21 8 ND 120 60-140 16 25 <br /> Gasoline(C6 C10) 876 50 1100 ND 80 60-140 12 25 <br /> Sul rugate 1 2-DCA-d4 275 250 110 60-140 <br /> Surrogate Toluene d8 236 25 0 94 60-140 <br /> Surrogate 4 BFB 25 7 250 103 60-140 <br /> Batch 2100443-EPA 5030B [PIT] <br /> Blank(2100443-BLKI) Prepared&Analyzed 10/29/02 <br /> Benzene ND 050 13g11 . <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 303 250 121 60-140 <br /> Surrogate Toluene-dd 266 250 106 60-140 <br /> Surrogate 4 BFB 266 250 106 60-140 <br /> Blank(2100443-BLK2) Prepared&Analyzed 10/30/02 <br /> Benzene ND 050 ugll <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 12-DCA-d4 253 250 101 60-140 <br /> Surrogate Toluene-d8 266 250 106 60-140 <br /> Surrogate 4-BFB 229 250 92 60-140 <br /> Sequoia Analytical-Sacramento Nie results to this report apply to the samples analyzed to accordance with the chain <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 5 of 8 <br />