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Sequoia 8t9 Avenue Suite 8 <br /> Sacramento CA 95$34 <br /> (916)921-9600 <br /> AX X100 <br /> Analytical www sequoialabs corn <br /> Stratus Environmental Project ARCO 6I00,Tracy,CA <br /> 3330 Cameron Park Drive, Ste 550 Project Number 6100,Tracy,CA Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 10/21/02 17 41 <br /> BTEX by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %RFC RPD <br /> Analyte Result Limit Units level Result %RFC Limits RPD Limit Notes <br /> Batch 2090241 -EPA 5030B [P/TJ <br /> Matrix Spike Dap(2090241-MSD1) Source 5209370-01 Prepared&Analyzed 09/23/02 <br /> Methyl tert-butyl ether 254 050 ugA 21 8 ND 117 60-140 18 25 <br /> Benzene 148 050 134 ND 110 70-130 2 25 <br /> Toluene 806 050 810 ND 100 70-130 05 25 <br /> Gasoline(C6-C10) 1020 50 1100 NO 93 60-140 4 25 <br /> Surrogate Toluene-d8 243 250 97 60-140 <br /> Surrogate 4-BFB 247 250 99 60-140 <br /> Surrogate 12-DCA-d4 242 250 97 60-140 <br /> • <br /> qr quota 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 6 <br />