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819 Striker Avenue,Suite 8 <br /> j Sequoia Sacramento, 5834 <br /> CA <br /> 99600 <br /> (9l6)92[-9640 <br /> Analytical ww.seqFAX 6ialabs 100 <br /> wwwsequoialabs.com <br /> URS-Sac,Gateway Oaks Project. ARCO 5450,Stockton,CA <br /> 2870 Gateway Oaks Dr.,Ste.300 Project Number: 5450,Stockton,CA Reported: <br /> Sacramento CA,95833 Project Manager: Vernon Elarth 09/04/02 11:19 <br /> GasolinelBTEXIOxygenates 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 2080300-EPA 5030B [PIT] <br /> LCS(2080300-BS1) Prepared&Analyzed:08/29/02 <br /> Methyl tert-butyl ether 0.0404 0.0050 mg/kg 0.0436 93 60-1140 <br /> Benzene 0.0247 0.0050 0.0268 92 70-130 <br /> Toluene 0.183 0.0050 0.162 113 70-130 <br /> Surrogate,1,1-DCA-d4 0.0439 0.0500 88 60-140 <br /> Surrogate:Toluene-d8 0.0565 0.0500 113 60-140 <br /> Surrogate:4-BFB 0.0536 " 0.0500 107 60-140 <br /> Matrix Spike(2080300-MSI) Source:5208335-39 Prepared&Analyzed:08/29/02 <br /> Methyl tert-butyl ether 0.0441 0.0050 mg/kg 0.0436 ND 101 60-140 <br /> Benzene 0.0260 0.0050 0.0268 ND 97 60-140 <br /> Toluene 0.194 0.0050 0.162 ND 119 60-140 <br /> Surrogate:l,1-DCA-d4 0.0473 0.0500 95 60-140 <br /> Surrogate:Toluene-d8 0.0624 0.0500 125 60-140 <br /> arrogale:4-BF8 0.0610 0.0500 121 60.140 <br /> Matrix Spike Dup(2080300-MSD1) Source:S208335-39 Prepared&Analyzed:08/29/02 <br /> Methyl tert-butyl ether 0.0450 0.0050 mglkg 0.0436 ND 103 60-140 2 25 <br /> Benzene 0.0270 0.0050 0.0268 ND 101 60-140 4 25 <br /> Toluene 0.195 0.0050 0.162 ND 120 60-140 0.5 25 <br /> Surrogate.,1,2-DCA-d4 0.0475 0.0500 95 60-140 <br /> Surrogate:Toluene-d8 0.0607 0.0500 111 60-140 <br /> Surrogate:4-BFB 0.0614 0.0500 113 60-140 <br /> Sequoia 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 Page 8 of 9 <br />