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819 Striker Avenue Suite S <br /> Sequoia Sacramento CA 95834 <br /> (916)921-%00 <br /> FAX(916)921-0100 <br /> Analytical www sequoialabs com <br /> 40 <br /> Stratus Environmental Project ARCO 6100,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 45 <br /> BTEX 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 2090241 -EPA 5030B (P/T] <br /> Matrix Spike Dup(2090241-MSD1) Source S209370-01 Prepared&Analyzed 09/23/02 <br /> Methyl tert-butyi ether 254 050 ugll 218 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-C 10) 1020 50 1100 ND 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-DC.4-d4 242 250 97 60-140 <br /> • <br /> uola Analytical-Sacramento The results in this report apply to the samples analyzed to accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirely <br /> Page 4 of 5 <br />