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819 Striker Ave Ste 8 <br /> ix) Sequoia Sacramento CA 95834 <br /> (916)921-9600 <br /> qW Analytical FAX(916)921 0100 <br /> www sequotalabs corn <br /> Weston Solutions Inc-Walnut Creek Project San Joaquin HSA S4t2468 <br /> 1575 Treat Blvd,Ste 212 Project Number N/A Reported <br /> Walnut Creek CA,94596 Project Manager Michelle Zehr 01/04/05 13 32 <br /> GasohnelBTEXIOxygenates 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 4120407-EPA 5030B IP/TJ/EPA 8260B <br /> Laboratory Control Sample(4120407-BS3) Prepared&Analyzed 01/03/05 <br /> Methyl tert-butyl ether 160 0 50 119/1 200 80 60-140 <br /> Benzene 172 0 50 200 86 70-130 <br /> Toluene 194 0 50 200 97 70-130 <br /> Surrogate 11-DCA-d4 807 100 81 60-140 <br /> Surrogate Toluene-d8 942 100 94 60-140 <br /> Surrogate 4-BFB 8 79 100 88 60-140 <br /> Matrix Spike(4120407-MSI) Source 5412472-01 Prepared 12/30/04 Analyzed 12/31/04 <br /> 1 Methyl tert-butyl ether 17 1 0 50 119/1 20 0 045 83 60-140 <br /> Benzene 17 8 0 50 20 0 ND 89 70-130 <br /> Toluene 19 6 0 50 20 0 ND 98 70-130 <br /> rrogate 1 2-DCA-d4 839 ii 100 84 60-140 <br /> rrogate Toluene-d8 101 100 101 60-140 <br /> Surrogate 4-BFB 9 05 100 90 60-140 <br /> Matrix Spike Dup(4120407-MSD1) Source 5412472-01 Prepared 12/30/04 Analyzed 12/31/04 <br /> Methyl tert-butyl ether 17 3 0 50 ug/1 20 0 045 84 60-140 1 25 <br /> Benzene 17 7 050 20 0 ND 88 70-130 0 6 25 <br /> Toluene 20 1 0 50 20 0 ND 100 70-130 3 25 <br /> Surrogate 1 2-DCA-d4 827 100 83 60-140 <br /> Surrogate Toluene-d8 104 100 104 60-140 <br /> Surrogate 4-BFB 907 100 91 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the <br /> chain of custody document Unless otherwise stated results are reported on a wet <br /> weight basis This analytical report must be reproduced in its entirety <br /> Page 11 of 12 <br />