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885 Jarvis Dr <br /> Sequoia q Morgan Hill,CA 95037 <br /> Analytical FAX(408)782-6308 <br /> www.sequoialabs.can <br /> tus Environmental Inc. Project: ARCO 45469, Stockton,CA MMA0406 <br /> 0 Cameron Park Dr., Suite 550 Project Number: ARCO#5469, Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: ,lay 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 /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3A24037-EPA 5030B PIT <br /> Blank(3A24037-BLK1) Prepared: 01/24/03 Analyzed:01/25/03 <br /> tert-Butyl alcohol ND 20 ug/l <br /> Methyl tert-butyl ether ND 0.50 " <br /> Ci-isopropyl ether ND 0.50 " <br /> Ethyl tert-butyl ether ND 0.50 " <br /> tert-Amyl methyl ether ND 0.50 " <br /> Surrogate:l,2-Dichloroethane-d4 4.57 5.00 91.4 78-129 <br /> Laboratory Control Sample(3A24037-BS1) Prepared:01/24/03 Analyzed:01/25/03 <br /> Methyl tert-butyl ether 4.73 0.50 ug/l 5.00 94.6 63-137 <br /> Surrogate:1,2-Dichloroethane-d4 4.41 5.00 88.2 78-129 <br /> oratory Control Sample(3A24037-BS2) Prepared: 01/24/03 Analyzed:01/25/03 <br /> Methyl tert-butyl ether 6.64 0.50 ug/1 9.04 73.5 63-137 <br /> Surrogate:l,2-Dichloroethane-d4 4.41 5.00 88.4 78-129 <br /> Laboratory Control Sample Dup(3A24037-BSD1) Prepared:01/24/03 Analyzed:01/25/03 <br /> Methyl tert-butyl ether 4.75 0.50 ug/] 5.00 95.0 63-137 0.422 13 <br /> Surrogate;1,2-Dichloroethane-d4 4.36 5.00 87.2 78-119 <br /> Laboratory Control Sample Dup(3A24037-BSD2) _ Prepared: 01/24/03 AnalYzed:01/25/03 <br /> Methyl tert-butyl ether 6.83 0.50 ug/1 9.04 75.6 63-137 2.82 13 <br /> Surrogate:l,2-Dichloroethane-d4 4.60 5.00 92.0 78-129 <br /> Batch 3A24038-EPA 5030B PIT <br /> Blank(3A24038-BLK1) Prepared: 01/24/03 Analyzed:01/25/03 <br /> tert-Butyl alcohol ND 20 up/l <br /> Methyl cert-butyl ether ND 0.50 <br /> Di-isopropyl ether ND 0.50 " <br /> Ethyl tert-butyl ether ND 0.50 " <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 /> 26 of 34 <br />