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.� v r� 819 Striker Avenue,Suite <br /> Sequoia Sacramento,CA 95831 <br /> (916)921-9600 <br /> FAX(916)921-010^ <br /> Analytical www.sequolalabs.cor� <br /> Kleinfelder-Stocktor Project: Northbrook S308269 ' <br /> 2825 East Myrtle Street Project Number: 34202.E01• Reported: J <br /> Stockton CA,95205 Project Manager:'toe Zilles 08/20/03 17:53 <br /> Total Metals by EPA 6000/7000 Series Methods - Quality Control J <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3080254-General Preparation <br /> Blank(3080254-BLKI) Prepared&Analyzed: 08/18/03 <br /> Hexavalent Chromium ND 0.25 mg/kg <br /> Laboratory Control Sample(3080254-BSI) Prepared&Analyzed: 08/18/03 <br /> Hexavalent Chromium 2.52 0.25 mg/kg 2.50 101 85-115 <br /> Laboratory Control Sample Dup(3080254-BSDI) Prepared&Analyzed:08/18/03 <br /> Hexavalent Chromium 2.52 0.25 mg/kg 2.50 101 85-115 0 200 <br /> J <br /> �3 <br /> J <br /> 3J <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 ort a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 24 of 29 <br /> J <br />