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j 819 p <br />Sequoia Striker Avenue, Suite 8 <br />Sacramento, CA 95834 <br />(916) 921-96M <br />FAX (916) 921'-0100 <br />[� %07 Analytical www.sequoialabs.com <br />Kleinfelder - Stockton <br />Project: <br />Northbrook <br />5310035 <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 />Diesel Hydrocarbons with Silica Gel Cleanup by DHS LUFT - 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 <br />3100085 - EPA 3550B <br />Blank (3100085-BLK1) <br />Prepared & Analyzed: 10/07/03 <br />Diesel Range Organics (C10 -C28) <br />ND 2.0 <br />mg/kg <br />LSurrogate: <br />Octacosane <br />Laboratory Control Sample (3100085-BS1) <br />0.584 <br />0.667 88 50-150 <br />Prepared & Analyzed: 10/07/03 <br />Range Organics (C 10-C28) <br />18.2 2.0 <br />mg/kg <br />16.7 109 60-140 <br />LDiesel <br />Surrogate: Octacosane <br />Matrix Spike (3100085-MS1) <br />0.780 <br />Source: 5310035-01 <br />0.667 117 50-150 <br />Prepared & Analyzed: 10/07/03 <br />Range Organics (CIO -C28) <br />15.5 2.0 <br />mg/kg <br />16.7 1.3 85 50-150 <br />LDiesel <br />Surrogate: Octacosane <br />Matrix Spike Dup (3100085-MSD1) <br />0.774 <br />Source: S310035-01 <br />0.667 116 50-150 <br />Prepared & Analyzed: -10/07/03 <br />LDiesel <br />Range Organics (CIO -C28) <br />16.5 2.0 <br />mg/kg <br />16.7 1.3 91 50-150 6• 50 <br />Surrogate: Octacosane <br />0.866 <br />0.667 130 50-150 <br />L <br />C <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 />Page 11 of 19 <br />