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819 Striker Avenue,Suite <br /> Sequoia Sacramento,CA 9583 <br /> (916)921-9600 <br /> Analytical FAX equo 921-010^ <br /> Y vwvw.sequoialabs.cor <br /> Kleinfelder-Stockton Project: Northbrook 5308269 1 <br /> 2825 East Myrtle Street Project Number: 34202.E01 Reported: <br /> Stockton CA,95205 Project Manager: Joe Zilles 08/20/03 17:53 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3080244-EPA 5030B (P/TI <br /> Blank(3080244-BLK l) Prepared&Analyzed: 08/18/03 <br /> Benzene ND 0.0050 mg/kg <br /> Bromobenzene ND 0.0050 <br /> Bromochloromethane ND 0.0050 " <br /> Bromodichloromethane ND 0.0050 " <br /> Bromoform ND 0.0050 " <br /> Bromomethane ND 0.025 <br /> n-Butylbenzene ND 0.0050 " <br /> sec-Butylbenzene ND 0.0050 " <br /> tert-Butylbenzene ND 0.0050 1 <br /> Carbon tetrachloride ND 0.0050 " <br /> Chlorobenzene ND 0.0050 " <br /> Chloroethane ND 0.0050 <br /> Chloroform ND 0.025 " <br /> Chloromethane ND 0.025 <br /> 2-Chlorotoluene ND 0.0050 " <br /> 4-Chlorotoluene ND 0.0050 <br /> Dibromochloromethane ND 0.0050 " <br /> 1,2-Dibromoethane(EDB) ND 0.0050 " <br /> Dibromomethane ND 0.0050 - 1 <br /> 1,2-Dibromo-3-chloropropane ND 0.025 J <br /> 1,2-Dichlorobenzene ND 0.0050 <br /> 1,3-Dichlorobenzene ND 0.0050 <br /> 1,4-Dichlorobenzene ND 0.0050 " <br /> Dichlorodifluoromethane ND 0.025 -' <br /> 1,1-Dichloroethane ND 0.0050 " <br /> 1,2-Dichloroethane ND 0.0050 1 <br /> 1,1-Dichloroethene ND 0.0050 J <br /> cis-1,2-Dichloroethene ND 0.0050 " <br /> trans-1,2-Dichloroethene ND 0.0050 <br /> 1,2-Dichloropropane ND 0.0050 J <br /> 1,3-Dichloropropane ND 0.0050 " <br /> 2,2-Dichloropropane ND 0.0050 1 <br /> 1,1-Diehl oropropene ND 0.0050 I <br /> Ethylbenzene ND 0.0050 J <br /> Hexachlorobutadiene ND 0.0050 " <br /> Isopropylbenzene ND 0.0050 <br /> Sequoia Analytical- Sacramento 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 26 of 29 <br />