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� 15)Sequoia � <br />=Analytical <br />C <br />819 Striker Avenue, Suite 8 <br />Sacramento, CA 95834 <br />(916)921-9600 <br />FAX (916) 921-010o <br />www.sequoialabs.com <br />Kleinfelder - Stockton <br />Project: <br />Northbrook <br />5309020 <br />2825 East Myrtle Street <br />Project Number: <br />34202.EO1 <br />Reported: <br />Stockton CA, 95205 <br />Project Manager: <br />Joe Zilles <br />09/05/03 14:17 <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 3090027 - EPA 5030B [P/T] <br />Blank (3090027-BLKI) <br />Prepared & Analyzed: 09/02/03 <br />Benzene <br />ND <br />0.0050 <br />mg/kg <br />LBromobenzene <br />ND <br />0.0050 <br />Bromochloromethane <br />ND <br />0.0050 <br />Bromodichloromethane <br />ND <br />0.0050 <br />" <br />ND <br />0.0050 <br />" <br />CBromoform <br />Bromomethane <br />ND <br />0.025 <br />" <br />n-Butylbenzene <br />ND <br />0.0050 <br />" <br />sec-Butylbenzene <br />ND <br />0.0050 <br />" <br />tert-Butylbenzene <br />ND <br />0.0050 <br />Carbon tetrachloride <br />ND <br />0.0050 <br />Chlorobenzene <br />ND <br />0.0050 <br />" <br />Chloroethane <br />ND <br />0.0050 <br />" <br />Chloroform <br />ND, <br />0.025 <br />Chloromethane <br />ND <br />0.025 <br />ND <br />0.0050 <br />" <br />L2-Chlorotoluene <br />4-Chlorotoluene <br />ND <br />0.0050 <br />" <br />Dibromochloromethane <br />ND <br />0.0050 <br />" <br />1,2-Dibromoethane (EDB) <br />ND <br />0.0050 <br />" <br />LDibromomethane <br />ND <br />0.0050 <br />11 <br />1,2-Dibromo-3-chloropropane <br />ND <br />0.025 <br />-Dichlorobenzene <br />ND <br />0.00501,3 <br />L1,2 <br />-Dichlorobenzene <br />ND <br />0.0050 <br />1,4 -Dichlorobenzene <br />ND <br />0.0050 <br />Dichlorodifluoromethane <br />ND <br />0.025 <br />ND <br />0.0050 <br />" <br />L1,1-Dichloroethane <br />1,2-Dichloroethane <br />ND <br />0.0050 <br />l,l-Dichloroethene <br />ND <br />0.0050 <br />cis- 1,2-Dichloroethene <br />ND <br />0.0050 <br />" <br />trans-1,2-Dichloroethene <br />ND <br />0.0050 <br />1,2-Dichloropropane <br />ND <br />0.0050 . <br />1,3-Dichloropropane <br />ND <br />0.0050 <br />" <br />L2,2-Dichloropropane <br />ND <br />0.0050 <br />1,1-Dichloropropene <br />ND <br />0.0050 <br />" <br />Ethylbenzene <br />ND <br />0.0050 <br />Hexachlorobutadiene <br />ND <br />0.0050 <br />" <br />Isopropylbenzene <br />ND <br />0.0050. <br />" <br />Sequoia Analytical - Sacramento <br />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 15 of 18 <br />