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i <br /> � A $!9 p y <br /> Sequ®la Striker Avenue, Suite 8 <br /> ' Sacramento,CA 95$34 <br /> (916)921-9600 <br /> Analytical wFAX(916)921-0100 <br /> waysequoialabs.com <br /> Stratus Environmental Project: ARCO 5469,Stockton,CA <br /> 3330 Cameron Park Drive,Ste.550 Project Number: 5469, Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: .lay Johnson 10/14/02 16:55 <br /> Volatile Organic Compounds 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 2100049-EPA 5030B [P/TI <br /> LCS(2100049-BSI) Prepared&Analyzed: 10/03/02 <br /> Methyl tert-butyl ether 20.8 0.50 ue 21.9 95 60-140 <br /> Surrogate:1,2-DCA-d4 20.4 11 25.0 82 60-140 <br /> Matrix Spike(2100049-MSI) Source: 5209552-16 Prepared&Analyzed: 10/03/02 _ <br /> Methyl tert-butyl ether 18.6 0.50 ugll 21.8 ND 83 60-140 <br /> Surrogate: 1,2-DCA-d4 16.5 25.0 66 60-140 <br /> Matrix Spike Dup(2100049-MSD1) Source: S209552-16 Prepared&Analyzed: 10/03/02 <br /> Methyl tent-butyl ether 22.1 0.50 ug/l 27.8 ND 99 60-140 17 25 <br /> Surrogate:1,2-DCA-d4 19.4 - - 25.0 78 60-140 <br /> i <br /> I <br /> quoia 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 12 of 13 <br />