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a_ _� ( 885]ands Dr <br /> Sequoia Morgan Hill,CA 95037 <br /> IqW Analytical FAX <br /> 408)776-9600 <br /> (408)782-6308 <br /> www,sequoiaiabs.can <br /> a(us Environmental Inc. Project: ARCO#5469,Stockton,CA MLK0837 <br /> 0 Cameron Park Dr.,Suite 550 Project Number: ARCO#5469, Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 12/23/02 10:37 <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 2K30002-EPA 5035 <br /> Matrix Spike Dup(2K30002-MSDI) Source:MLK0861-03RE1Prepared: 11/30/02 Analyzed: 12/01/02 A-01 <br /> Methyl tert-butyl ether 61.0 2.4 ug/kg 48.5 ND 126 60-140 2.15 25 <br /> Surrogate: 1,2-Dichloroelhane-d4 4.35 5.00 87.0 60-140 <br /> Batch 2LO4034-EPA 5030B PIT <br /> Blank(2L04034-BLK1) Prepared&Analyzed: 12/05/02 <br /> Ethanol ND 40 ug/l <br /> tert-Butyl alcohol ND 20 " <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 /> Vchloroethane ND 0.50 " <br /> ibromoethane(EDB) ND 0.50 " <br /> Surrogate:l,2-Dichloroethane-d4 4.98 5.00 99.6 78-129 <br /> Laboratory Control Samele(2L04034-BS1) Prepared&Analyzed: 12/05/02 ^ <br /> Methyl tert-butyl ether 8.11 0.50 ug/l 10.0 81.1 63-137 <br /> Surrogate: 1,2-Dichloroethane-d4 4.77 5.00 95.4 78-129 <br /> Laboratory Control Sample Dup(2L04034-BSD1) Prepared&Analyzed: 12/05/02 <br /> Methyl tert-butyl ether 8.13 0.50 ugll 10.0 813 63-137 0.246 13 <br /> Surrogate:l,2-Dichloroethane-d4 4.82 5.00 96.4 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 /> Page 12 of 13 <br />