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885 Jarvis Dr <br /> a— ) Sequoia Mopn Hill,CA 95037 <br /> An alytie al FAX(408408)776-9600 <br /> 782-630$ <br /> www.sequoialabs.com <br /> t <br /> tes Environmental Inc. Project: ARCO#5469,Stockton,CA MLL0441 <br /> 0 Cameron Park Dr.,Suite 550 Project Number: ARCO#5469,Stockton,CA Reported: <br /> meron Park CA,95682 Project Manager: Jay Johnson 01/07/03 12:15 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2L24008-EPA 5030E PIT <br /> Laboratory Control Sample(2L24008-BS1) Prepared&Analyzed: 12/24/02 <br /> Methyl tert-butyl ether 9.60 0.50 ug/1 10.0 96.0 63-137 <br /> Surrogate: 1.1-Dichloroethane-d4 6.02 5.00 120 78-129 <br /> Laborate Control Sample Dup(2L24008-BSD1) Prepared&Analyzed: 12/24/02 <br /> Methyl tent-butyl ether 9.54 0.50 Ug/1 10.0 95.4 63-137 0.627 13 <br /> Surrogate: 1,2-Dichloroethane-d4 5.98 5.00 120 78-129 <br /> uoia Analytical-Morgan Hill 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 report must be reproduced in its entirety. <br /> Page 19 of 20 <br />