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L; v <br />Sequoia <br />W4W Analytical <br />819 Striker Avenue, Suite J <br />Sacramento, CA 95834 <br />(916) 921-9600 <br />FAX (916) 921 -01 O }} <br />www.sequoialabs.cor j <br />Kleinfelder - Stockton <br />Project: <br />Northbrook <br />S310035 <br />2825 East Myrtle Street <br />Project Number: <br />34202.E01 <br />Reported: <br />Stockton CA, 95205 <br />Project Manager: <br />Joe Zilles <br />10/09/03 15:55 <br />Total Metals by EPA 6000/7000 Series Methods - Quality Control <br />Sequoia Analytical - Petaluma. <br />Reporting Spike Source %REC RPD <br />Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />J <br />I <br />J <br />Batch 3100137 - General Preparation <br />i <br />Blank(3100137-BL){1) <br />Prepared & Analyzed: 10/07/03 <br />—J <br />Hexavalent Chromium <br />ND 0.21 <br />mg/kg <br />Laboratory Control Sample (3100137 -BSI) <br />Prepared & Analyzed: 10/07/03 <br />Hexavalent Chromium <br />3.54 0.21 <br />mg/kg <br />4.00 88 80-120 <br />— <br />Matrix Spike (3100137 -MSI) <br />Source: P310041-01 <br />Prepared & Analyzed: 10/07/03 <br />Hexavalent Chromium <br />ND 0.21 <br />mg/kg <br />3.95 ND 75-125 <br />QM -07 <br />Matrix Spike (3100137-MS2) <br />Source: P310041-01 <br />Prepared & Analyzed: 10/07/03 <br />Hexavalent Chromium <br />560 20 <br />mg/kg <br />1230 ND 46 75-125 <br />QM -07 <br />Matrix Spike (3100137-MS3) <br />Source: P310041-01 <br />Prepared & Analyzed: 10/07/03 <br />Hexavalent Chromium <br />1.34 0.21 <br />mg/kg <br />4.00 ND 34 75-125 <br />QM -07 <br />Matrix Spike Dup (3100137-MSD1) <br />Source: P310041-01 <br />Prepared & Analyzed: 10/07/03 <br />Hexavalent Chromium <br />ND 0.20 <br />mg/kg <br />3.92 ND 75-125 20 <br />QM -07 <br />Matrix Spike Dup (:3100137-MSD2) <br />Source: P310041-01 <br />Prepared & Analyzed: 10/07/03 <br />Hexavalent Chromium <br />660 20 <br />mg/kg <br />921 ND 72 75-125 16 20 <br />QM -07 <br />Matrix Spike Dup (3100137-MSD3) <br />Source: P310041-01 <br />Prepared & Analyzed: 10/07/03 <br />Hexavalent Chromium <br />1.38 0.21 <br />mg/kg <br />4.00 ND 34 75-125 3 20 <br />QM -07 <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 />WA <br />J <br />11 <br />J <br />Page 10 of 19 i <br />