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Jarvi <br /> Sequoia 885 A95 Dr <br /> a_ _� Morgan Hill,CA 95037 <br /> Analytical FAX(408)776-9600 <br /> (408)782-6308 <br /> www.se quoialabs.corn <br /> a 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 /> Blank(2K30002-BLK1) Prepared: 11/30/02 Analyzed: 12/01/02 A-01 <br /> Ethanol ND 40 ug/kg <br /> tent-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 0-09 <br /> 1,2-Dichloroethane ND 0.50 " <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> Surrogate: 1,1-Dichloroethane-d4 3.88 5.00 77.6 60-140 <br /> Blank(2K30002-BLK2) Prepared: 11/30/02 Analyzed: 12/01/02 <br /> of ND 40 ug/kg <br /> utyl alcohol ND 20 0-09 <br /> Methyl tert-butyl ether ND 0.50 " <br /> Di-isopropyl ether ND 0.50 " <br /> Ethyl Cert-butyl ether ND 0.50 " <br /> tert-Amyl methyl ether ND 0.50 0-09 <br /> 1,2-Dichloroethane ND 0.50 <br /> 1,2-Dibromoethane(EDB) ND 0.50 <br /> Surrogate: l,1-Dichloroethane-d4 4.28 5.00 85.6 60-140 <br /> Laboratory Control Sam le(2K30002-BS1) Prepared&Analyzed: 11/30/02 A-01 <br /> Methyl tert-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-MS1) Source:M_LK0861-03RElPrepared: 11/30/02 Analyzed: 12/01/02 A-01 <br /> Methyl tert-butyl ether 59.7 2.5u-ug/kg 49.5 ND 121 60-140 <br /> Surrogate. l,1-Dichloroethane-d4 4.34 11 5.00 86.8 60-140 <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 11 of 13 <br />