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885 Jarvis <br /> Sequoia MaganHiā˛¢,CA 9503737 <br /> (408)776-9600 <br /> Analytical FAX(408)782-6308 <br /> www.sequoialabs.ecm <br /> tus Environmental Inc. Project: ARCO#5469, Stockton,CA MMA0406 <br /> 0 Cameron Park Dr.,Suite 550 Project Number: ARCO#5469,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 02/11/03 14:07 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> An Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3A25001 -EPA 5030B PIT <br /> Laboratory Control Sample(3A25001-BS1) Prepared:01/23/03 Analyzed:01/24/03 <br /> Methyl tert-butyl ether 4.71 0.50 ug/1 5.00 94.2 63-137 <br /> Surrogate:l,2-Dichloroethane-d4 4.49 5.00 89.8 78-129 <br /> Laboratory Control Sample(3A25001-BS2) Prepared:01/23/03 Analyzed: 01/24/03 <br /> Methyl tert-butyl ether 8.12 0.50 ug/l 9.04 89,8 63-137 <br /> Surrogate:l,1-Dichloroethane-d4 4.51 5.00 90.2 78-129 <br /> Laboratory Control Sample Dup(3A25001-BSD1) Prepared:01/23/03 Analyzed: 01/24/03 <br /> Methyl tert-butyl ether 4.78 0.50 ug/1 5.00 95.6 63-137 1.48 13 <br /> gate: <br /> 1,2-Dichloroethane-d4 4.48 5.00 89.6 78-119 <br /> Laboratory Control Sample Dup(3A25001-BSD2) Prepared:01/23/03 Analyzed: 01/24/03 <br /> Methyl tert-butyl ether 8.39 0.50 ug/1 9.04 92,8 63-137 3.27 13 <br /> Surrogate:l.2-Dichloroethane-d4 4.60 5.00 92.0 78-129 <br /> oia 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 /> 28 of 34 <br />