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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 <br />Result Limit Units Level Result %REC Limits RPD Limit Notes <br />J <br />Batch 3090123 - General Preparation <br />Blank (3090123-BLKt) <br />Prepared & Analyzed: 09/09/03 <br />Hexavalent Chromium <br />ND 0.25 mg/kg <br />Laboratory Control Sample (3090123 -BSI) <br />Prepared & Analyzed: 09/09/03 <br />Hexavalent Chromium <br />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 <br />2.58 0.25 mg/kg 2.50 103 85-115. 4 200 <br />J <br />J <br />- <br />J <br />,J <br />- <br />J <br />. <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 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 />