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L <br />Striker Avenue, Suite 8 <br />819 <br />Y Sequoia Sacramento, CA 95834 <br />(916) 921-9600 <br />FAX (916) 921-0100 <br />www.sequoialabs.com <br />�„� Analytical wnsequoiaiabs.com <br />Kleinfelder - Stockton Project: Northbrook S310035 <br />2825 East Myrtle Street Project Number: 34202.E01 Reported: <br />Stockton CA, 95205 Project Manager: Joe Zilles 1 10/09/03 15:55 <br />Total Metals by EPA6000/7000 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 />LBatch 3100028 - EPA 3050B <br />Blank (3100028-BLK1) <br />Prepared: 10/01/03 Analyzed: 10/03/03 <br />Cadmium <br />ND <br />0.25 <br />mg/kg <br />LChromium <br />ND <br />0.25' <br />" <br />Lead <br />ND <br />2.5 <br />" <br />Nickel <br />ND <br />1.0 <br />" <br />Zinc <br />ND <br />0.25 <br />Blank (3100028-BLK2) <br />Prepared: 10/02/03 Analyzed: 10/03/03 <br />Cadmium <br />ND <br />0.25 <br />mg/kg <br />ND <br />0.25 <br />" <br />LChromium <br />Lead <br />ND <br />2.5 <br />Nickel <br />ND <br />1.0 <br />Zinc <br />Zinc <br />ND <br />0.25 . <br />" <br />Control Sample (3100028-BS1) <br />Prepared: 10/01/03 Analyzed: 10/03/03 <br />Cadmium <br />40.2 <br />0.25 <br />mg/kg <br />50.0 80 80-120 <br />Chromium <br />40.4 <br />0.25 <br />50.0 81 80-120 <br />Lead <br />39.8 <br />2.5 <br />50.0 80 80-120 <br />Nickel <br />40.5 <br />1.0 <br />50.0 81 80-120 <br />Zinc <br />40.1 <br />0.25 <br />50.0 80 80-120 <br />Laboratory Control Sample (3100028-BS2) <br />Prepared: 10/02/03 Analyzed: 10/03/03 <br />Chromium <br />56.3 <br />1.0 <br />mg/kg <br />50.0 113 80-120 <br />Nickel <br />57.0 <br />4.0 <br />50.0 114 80-120 <br />LZinc <br />58.7 <br />1.0 <br />50.0 117 80-120 <br />Matrix Spike (3100028 -MSI) <br />Source: S310005-01 <br />Prepared: 10/01/03 Analyzed: 10/03/03 <br />Cadmium <br />38.0 <br />1.0 <br />mg/kg <br />50.0 0.74 75 80-120 <br />Q-LIM <br />Chromium <br />71.3. <br />1.0 <br />50.0 32 79 80-120 <br />Q-LIM <br />`Lead <br />42.1 <br />10 <br />50.0 5.3 74 80-120 <br />Q-LIM <br />Nickel <br />64.4 <br />4.0 <br />50.0 26 77 80-120 <br />Q-LIM <br />LZinc <br />94.6 <br />1.0 <br />50.0 58 73 80-120 <br />Q-LIM <br />L <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 />L This analytical report must be reproduced in its entirety. <br />Page 13 of 19 <br />