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�Q <br />Sequoia <br />Analytical <br />Kleinfelder - Stockton <br />2825 East Myrtle Street <br />Stockton CA, 95205 <br />Project: Northbrook <br />Project Number: 34202.E01 <br />Project Manager: Joe Zilles <br />Polychlorinated Biphenyls by EPA Method 8082 - Quality Control <br />Sequoia Analytical - Sacramento ' <br />819 Striker Avenue, Suite 8 <br />Sacramento, CA 95834 <br />(916) 921-9600 <br />FAX (916) 921-0100 <br />www.sequoialabs.com <br />5308269 <br />Reported: <br />08/20/03 17:53 <br />Reporting Spike Source %REC _ RPD <br />Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch 3080191 - EPA 3550B <br />.lank (3080191-BLKI) <br />PCB -1016 <br />'CB -1221 <br />'CB -1232 <br />PCB -1242 <br />PCB -1248 <br />LCB -1260 B-1254 <br />Surrogate: Decachlorobiphenyl <br />C-aboratory Control Sample (30 <br />191 -BS <br />)ared:08/14/03 Anal: <br />ND <br />33 ug/kg <br />ND <br />60 " <br />ND <br />33 " <br />ND <br />33 <br />ND <br />33 " <br />ND <br />33 " <br />ND <br />33 " <br />33.5 <br />33.3 <br />101 50-150 <br />08/14/03 Analyzed: 08/15/03 <br />—PCB -1016 <br />321 <br />33 <br />ug/kg <br />333 96 50-150 <br />307 <br />33 <br />333 92 50-150 <br />rPCB-1260 <br />Liurrogate: Decachlorobiphenyl <br />35.5 <br />33.3 107 50-150 <br />Matrix Spike (3080191 -MSI) <br />Source: S308269-02 <br />`'.Prepared: 08/14/03 Analyzed: 08/15/03 <br />PCB -1016 <br />310 <br />33 <br />ug/kg <br />333 ND 93 50-150 <br />'CB -1260 <br />297 <br />33 <br />333 ND 89 50-150 <br />Surrogate: Decachlorobiphenyl <br />33.4 <br />33.3 100 50-150 <br />Matrix Spike Dup (3080191-MSD1) <br />Source: S308269-02 <br />Prepared: 08/14/03 Analyzed: 08/15/03 <br />'CB -1016 <br />323 <br />33 <br />ug/kg <br />333 ND 97 50-150 4 50 <br />CB -1260 <br />312 <br />33 <br />333 ND 94 50-150 5 50 <br />LSurrogate: Decachlorobiphenyl <br />32.0 <br />33.3 96 50-150 <br />L <br />Sequoia Analytical - Sacramento 77ie results in this report apply to the samples analyzed in accordance with the chain of <br />L custody document. Unless otherwise stated, results are reported on a wet weight basis. <br />This analytical report must be reproduced in its entirety. <br />LPage 25 of 29 <br />