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885 Jarvis Dr <br /> Sequoia Mcrpn Hill,CA 95037 <br /> .Analytical (408)776-9600 <br /> FAX(408)782-6308 <br /> www.sequoialabs.com <br /> tus Environmental Inc. Project: ARCO#5469,Stockton,CA MMA0406 <br /> 30 Cameron Park Dr.,Suite 550 Project Number: ARCO 95469,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 /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3A24038-EPA 5030E PIT <br /> Blank(3A24038-BLK1) Prepared:01/24/03 Analyzed:01/25/03 <br /> cert-Amyl methyl ether ND 0.50 ugJl <br /> Surrogate:l,1-Dichloroethane-d4 4.64 5.00 92.8 78-129 <br /> LaboratorLControl Sample(3A24038-BS1) Prepared:01/24/03 Analyzed:01/25/03 <br /> Methyl tert-butyl ether 5.02 0.50 ug/l 5.00 100 63-137 <br /> Surrogate: l,2-Dichloroethane-d4 4.37 5.00 87.4 78-129 <br /> Laboratory Control Sample(3A24038-BS2) Prepared:01/24/03 Analyzed: 01/25/03 <br /> Methyl tert-butyl ether 6.93 0.50 ug/l 9.04 76.7 63-137 <br /> gate:l,1-Dichloroethane-d4 4.52 5.00 90.4 78-129 <br /> Laboratory Control Sample Dup(3A24038-BSD1) Prepared:01/24/03 Analyzed:01/25/03 <br /> Methyl tert-butyl ether 4.96 0.50 ugll 5.00 99.2 63-137 1.20 13 <br /> Surrogate:1,2-Dichloroethane-d4 4.54 5.00 90.8 78-119 <br /> Laboratory Control Sample Dup(3A24038-BSD2) Prepared:01/24/03 Analyzed:01/25/03 <br /> Methyl tert-butyl ether 6.83 0.50 ug/I 9.04 75.6 63-137 1.45 13 <br /> Surrogate: l,2-Dichloroethane-d4 4.55 5.00 91.0 78-129 <br /> Batch 3A25001 -EPA 5030B PIT <br /> Blank(3A25001-BLK1) Prepared:01/23/03 Analyzed: 01/24/03 <br /> tert-Butyl alcohol ND 20 Ug/1 <br /> Methyl tert-butyl ether ND 0.50 " <br /> Di-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 /> 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 /> 27 of 34 <br />