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ker Aveue,Suite 8 <br /> Sequoia ' 8195 clame ton CA 95834 <br /> (916)921-9600 <br /> FAX(916)921-0100 <br /> Analytical www.secluoialabs.com <br /> Kleinfelder—Stockton Project: 1444 Mariposa S309079 <br /> 2825 East Myrtle Street Project Number: 34202 Reported: J <br /> Stockton CA,95205 Project Manager: Francis Bean 09/09/03 16:14 <br /> Total Metals by EPA 6000/7000 Series Methods - Quality Control <br /> Sequoia Analytical - Sacramento <br /> _ 1 <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes J <br /> Batch 3090123-General Preparation <br /> Blank(3090123-BLKt) Prepared&Analyzed: 09/09/03 <br /> Hexavalent Chromium ND 0.25 mg/kg <br /> Laboratory Control Sample(3090123-BSI) Prepared&Analyzed: 09/09/03 <br /> Hexavalent Chromium 2.68 0.25 mg/kg 2.50 107 85-115 <br /> Laboratory Control Sample Dup(3090123-BSD1) Prepared&Analyzed: 09/09/03 <br /> Hexavalent Chromium 2.58 0.25 mg/kg 2.50 103 85-115 . 4 200 <br /> J <br /> J <br /> - J <br /> ,J <br /> - J <br /> . J <br /> J <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 10 of 17 <br />