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Sequoia 885 Jarvis Dr <br /> Morgan Hill,CA 95037 <br /> Analytica l (408)776.9600 <br /> FAX(408)782-6308 <br /> www.=quoialabs.com <br /> tratus Environmental Inc. Project: ARCO#5469,Stockton,CA MLK4837 <br /> 3G 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 /> FAnaly�te Reporting Spike Source %REC RPB <br /> ,Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2K30002-EPA 5035 <br /> Blank(21<30002-BLKI) Prepared: 11/30/02 Analyzed: 12/01/02 A-01 <br /> Ethanol ND 40 ug/kg <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tent-butyl ether ND 0.50 " <br /> Di-isopropyl ether ND 0.50 " <br /> Ethyl teri-butyl ether ND 0.50 " <br /> tert-Amyl methyl ether ND 0.50 0-09 <br /> 1,2-Dichloroethane ND 0.50 " <br /> I,2-Dibromoethane(EDB) ND 0.50 " <br /> Surrogate: 1,2-Dichloroethane-d4 3.88 5.00 77.6 60-140 <br /> Blank(2K30002-SLK2) Prepared: I 1130/02 Analyzed: 12/01/02 <br /> Ethanol ND 40 ug/kg <br /> utyl alcohol ND 20 0-09 <br /> ethyl tort-butyl ether ND 0.50 <br /> Di-isopropyl ether ND 0.50 " <br /> Ethyl tert-butyl ether ND 0.50 " <br /> tert-Amy]methyl ether ND 0.50 0-09 <br /> 1,2-Dichloroethane ND 0.50 " <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> Surrogate:1,2-Dichloroefhane-d4 4.28 5.00 85.6 60-140 <br /> Laboratory Control Sample(2K30002-BSI) Prepared&Analyzed: 11/30/02 A-01 <br /> Methyl teri-butyl ether 12,5 0.50 ug/kg 10.0 125 60-140 <br /> Surrogate:l,1-Dichloroethane-d4 4.29 5.00 85.8 60-140 <br /> Matrix Spike(2K30002-MSI) Source: MLK0861-03RElPrepared: 11/30/02 Analyzed: 12/01/02 A-61 <br /> Methyltert-butyl ether 59.7 2.5 ug/kg 49.5 ND 121 60-140 <br /> Surrogate:l,2-Dichloroethane-d4 4.34 " 5.00 86.8 60-140 <br /> S Sia 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 entirer)� <br /> Page 1 l of l3 <br />