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B l9 Sinker Ave Ste 8 <br /> Sequoia Sacramento CA 95834 <br /> (916)921 9600 <br /> 64) <br /> Analytical FAX(916)921 0100 <br /> www sequoialabs com <br /> Gettler-Ryan-Petaluma Project Tosco 6981, Stockton,CA 5302524 <br /> 1364 N McDowell Blvd Ste B2 Project Number NIA Reported <br /> Petaluma CA,94954 Project Manager Dave Vossler 03/07/03 16 58 <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 Limit Notes <br /> Batch 3030052-EPA 5030B 1P/T1 <br /> Laboratory Control Sample(3030052-BS2) Prepared&Analyzed 03/06/03 <br /> Surrogate Toluene-d8 281 ugR 250 113 60-140 <br /> Surrogate 4-BFB 273 250 109 60-140 <br /> Matrix Spike (3030052-MSI) Source S302580-02 Prepared 03/06/03 Analyzed 03/07/03 <br /> Benzene 151 050 ugll 13 6 ND 111 70-130 <br /> Toluene 881 0 50 834 ND 106 70-130 <br /> Methyl tert butyl ether 262 2 0 224 ND 117 60-140 <br /> Gasoline(C6 C10) 1060 50 1 100 ND 96 60 140 <br /> Sun agate Toluene-d8 286 250 114 60-140 <br /> Surrogate 4-BFB 191 250 117 60-140 <br /> Q.trix.Spike Dup(3030052-MSD1) Source 5302580-02 Prepared 03/06/03 Analyzed 03/07/03 <br /> Seuzene 148 050 ug/l 136 ND 109 70 130 2 25 <br /> Toluene 865 0 50 83 4 ND 104 70-130 2 25 <br /> Methyl tert butyl ether 25 1 20 224 ND 112 60-140 4 25 <br /> Gasoline(C6 C10) 1040 50 1100 ND 95 60-140 2 25 <br /> Surrogate Toluene-d8 276 250 110 60 140 <br /> Surrogate 4-BFB 284 250 114 60-140 <br /> quota Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical repot t must be reproduced in its entirety <br /> Page 5 of 6 <br />