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^ � <br /> � 819 Sulker Avenue Suite$ <br /> Sequoia <br /> ' y� Sacramento CA 95834 <br /> J e qu o 1 a (916)921-9600 <br /> ID FAX(916)921-0100 <br /> Analytical <br /> www sequoialabs com <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 Prglect Manager Dave Vossler 11/07/02 16 03 <br /> Gasollne\BTEXIOxygenates 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 Lima Notes <br /> Batch 2100435-EPA 5030E [P/TJ <br /> Blank(2100435-BLKI) Prepared &Analyzed 10/29/02 <br /> Benzene ND 050 ug/1 <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) ND 050 <br /> Methyl tert-butyl ether ND 0 50 " <br /> Gasoline(C6-Cl 0) ND 50 " <br /> Surrogate 12 DC}4-d4 238 25 0 95 60-140 <br /> Sui rogate Toluene-d8 244 250 98 60-140 <br /> Suriogate 4-BFB 236 250 94 60-140 <br /> L oratory Control Sample{2100435-BS1) Prepared &Analyzed ]0129/02 <br /> ne 14 6 0 50 ug/1 13 4 109 70-130 <br /> o uene 79 3 0 50 81 0 98 70-130 <br /> Methyl tert-butyl ether 223 050 21 8 102 60-140 <br /> Gasoline(C6-C10) 1020 50 1100 93 70-130 <br /> Surrogate 1 2-DCA-d4 250 250 100 60-140 <br /> Surrogate Toluene-d8 240 250 96 60-140 <br /> Surrogate 4-BFB 247 250 99 60-140 <br /> Matrix Spike(2100435-MSI) Source 5210478-01 Prepared&Analyzed 10/29/02 <br /> Benzene 149 050 ug/1 134 ND 111 70-130 <br /> Toluene 799 050 810 ND 99 70-130 <br /> Methyl tert-butyl ether 223 050 218 ND 102 60-140 <br /> Gasoline(C&C10) 984 50 1100 ND 89 60-140 <br /> Surrogate 11-DCA-d4 22 7 251) 91 60-140 <br /> Surrogale Toluene-d8 233 250 93 60-140 <br /> Suri ognte 4 BFB 23 8 250 95 60-140 <br /> u0[a Analytical-Sacramento The resulls in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be i eproduced rri its entirety <br /> Page 4 of 8 <br />