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4 4 5) Sequoia � <br />Analytical <br />0 <br />819 Striker Avenue, Suite 8 <br />Sacramento, CA 95834 <br />(916) 921-9600 <br />FAX (916) 92 1 -0100 <br />www.sequoialabs.com <br />Kleinfelder - Stockton <br />Project: <br />1444 Mariposa <br />S309079 <br />2825 East Myrtle Street <br />Project Number: <br />34202 <br />Reported: <br />Stockton CA, 95205 <br />Project Manager: <br />Francis Bean <br />09/09/03 16:14 <br />Total Metals by EPA 6000/7000 Series Methods - 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 />Batch 3090123 - General Preparation <br />Blank (3090123-BLK1) 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 Dug (3090123-BSDI) Prepared & Analyzed: 09/09/03 <br />Hexavalent Chromium 2.58 0.25 mg/kg 2.50 103 85-115 4 200 <br />equoia 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 />