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M <br />Sequoia <br />Analytical <br />819 Striker Ave Ste 8 <br />Sacramento, CA 95834 <br />(916) 921-9600 <br />FAX (916) 921-0100 <br />www.sequoialabs.com <br />Kleinfelder - Stockton <br />Project: <br />Northbrook <br />S308269 <br />2825 East Myrtle Street <br />Project Number: <br />34202.E01 <br />Reported: <br />Stockton CA, 95205 <br />Project Manager: <br />Joe Zilles <br />08/20/03 17:53 <br />Total Metals by EPA 6000/7000 Series Methods - 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 3080192 - EPA 3050B <br />Blank (3080192-BLKI) <br />Prepared: 08/14/03 Analyzed: 08/15/03 <br />Cadmium <br />ND <br />0.25 mg/kg <br />Chromium <br />ND <br />0.25 " <br />Lead <br />ND <br />2.5 " <br />Nickel <br />ND <br />1.0 " <br />Zinc <br />ND <br />0.50 " <br />Laboratory Control Sample (3080192-BS1) <br />- <br />Prepared: 08/14/03 Analyzed: 08/15/03 <br />Cadmium <br />44.0 <br />0.25 <br />mg/kg <br />50.0 88 80-120 <br />Chromium <br />44.8 <br />0.25 <br />50.0 90 80-120 <br />Lead <br />44.2 <br />2.5 <br />50.0 88 80-120 <br />Nickel <br />45.1 <br />1.0 <br />50.0 90 80-120 <br />Zinc <br />45.9 <br />0.50 <br />50.0 92 80-120 <br />Matrix Spike (3080192 -MSI) <br />Source: S308268-03 <br />Prepared: 08/14/03 Analyzed: 08/15/03 <br />Cadmium <br />40.1 <br />1.0 <br />mg/kg <br />50.0 ND 80 80-120 <br />Chromium <br />67.9 <br />1.0 <br />50.0 26 84 80-120 <br />Lead <br />38.0 <br />10 <br />50.0 ND 76 80-120 <br />Q-LIM <br />Nickel <br />75.8 <br />4.0 <br />50.0 34 84 80-120 <br />Zinc <br />85.8 <br />2.0 <br />50.0 44 84 80-120 <br />Matrix Spike Dup (3080192-MSDI) <br />Source: S308268-03 <br />Prepared: 08/14/03 Analyzed: 08/15/03 <br />Cadmium <br />38.1 <br />1.0 <br />mg/kg <br />50.0 ND 76 80-120 <br />5 <br />20 <br />Q-LIM <br />Chromium <br />65.8 <br />1.0 <br />50.0 26 80 80-120 <br />3 <br />20 <br />Lead <br />34.5 <br />10 <br />50.0 ND 69 80-120 <br />10 <br />20 <br />Q-LIM <br />Nickel <br />73.7 <br />4.0 <br />50.0 34 79 80-120 <br />3 <br />20 <br />Q-LIM <br />Zinc <br />79.3 <br />2.0 <br />50.0 44 71 80-120 <br />8 <br />20 <br />Q-LIM <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 />pnop 73 of 7Q <br />