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819 Striker Avenue, Suite+ <br />' <br />Sequoia Sacramento. CA 9583TJ <br />(916) 921-9600 <br />FAX (916) 921-01 Or + <br />Analytical- www.sequoialabs.corJ <br />Kleinfelder - Stockton Project: Northbrook S310035 <br />2825 East Myrtle Street Project Number: 34202.E01 Reported: <br />Stockton CA, 95205 Project Manager: Joe Zilles 10/09/03 15:55 <br />Total Metals by EPA 6000/7000 Series Methods - Quality Control <br />Sequoia Analytical - Sacramento <br />Reporting <br />Spike Source %REC <br />RPD <br />J <br />Analyte <br />Result Limit <br />Units Level Result %REC Limits RPD <br />Limit Notes <br />Batch 3100028 - EPA 3050B <br />i <br />Matrix Spike Dup (3100028-MSD1) <br />Source: S310005-01 <br />Prepared: 10/01/03 Analyzed: 10/03/03 <br />J <br />Cadmium <br />41.0 1.0 <br />mg/kg 50.0 0.74 81 80-120 8 <br />20 <br />Chromium <br />74.6 1.0 <br />50.0 32 85 80-120 5 <br />20 <br />Lead <br />45.9 10 <br />50.0 5.3 81 80-120 9 <br />20 <br />Nickel <br />68.6 4.0 <br />50.0 26 85 80-120 6 <br />20 <br />Zinc <br />106 1.0 <br />50.0 58 96 80-120 11 <br />20 j <br />J <br />J <br />J <br />J <br />J <br />J <br />J <br />J <br />J <br />Sequoia Analytical - Sacramento <br />The results in this report apply to the samples analyzed in accordance with the chain of <br />custody document. Unless otherwise stater, results are reported on a wet weight basis. <br />This analytical report must be reproduced in its entirety. <br />Page 14 of 19 <br />