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819 Striker Avenue Suite 8 <br /> 1 Sacramento CA 95834 <br /> ' <br /> Sequoia (916)921-9600 <br /> FAX f 916)92 t-O 100 <br /> Analytical www seq=alabs com <br /> to <br /> Gealer-Ryan-Petaluma Project Former Tosco 6981, Stockton,CA 5208311 <br /> 1364 N McDowell Blvd Ste B2 ProlectNumber N/A Reported <br /> Petaluma CA,94954 Project Manager Dave Vossler 08/29/02 14 28 <br /> GasolineTTEX1Oxygenates by EPA method 8260B - Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %RE.0 RPD <br /> Analyte Result Limn Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2080256-EPA 5030B [P/TJ <br /> Matrix Spike Dup(2080256-MSD]) Source S208332-01 Prepared&Analyzed 08/27/02 <br /> Benzene 160 050 uO 13 4 ND 119 70-130 1 25 <br /> Toluene 863 050 810 0 67 106 70-130 0 9 25 <br /> Methyl tert-butyl ether 53 0 050 21 8 23 138 60-140 4 25 <br /> Gasoline(C6-C10) 1080 50 1100 ND 97 60-140 0 25 <br /> Surrogate 12-DCA-d4 252 250 101 60-140 <br /> Surrogate Toluene-d8 250 250 100 60-140 <br /> Surrogate 4-BFB 255 250 102 60-140 <br /> Batch 2080283-EPA 5030B [PIT] <br /> Blank(2080283-BLK1) Prepared &Analyzed 08/28/02 <br /> W e <br /> ND 050 ug/l <br /> 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 222 250 89 60-140 <br /> Surrogate Toluene-d8 23 4 25 0 94 60-140 <br /> Surrogate 4-BFB 22 8 25 0 91 60-140 <br /> Laboratory Control Sample(2080283-BSI) Prepared &Analyzed 08/28/02 <br /> Benzene 143 050 ug/l 134 107 70-130 <br /> Toluene 81 2 050 810 100 70-130 <br /> Methyl wt-butyl ether 23 1 050 218 106 60-140 <br /> Gasoline(C6-C10) 1020 50 1100 93 70-130 <br /> Surrogate 1 2-DCA d4 229 250 92 60-140 <br /> Surrogate Toluene A 235 25 0 94 60-140 <br /> Surrogate 4-BFB 234 25 0 94 60-140 <br /> uoi I Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 5 of 7 <br />