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ki <br />a—) Sequoia <br />VW Analytical <br />819 Striker Ave Ste 8 <br />Sacramento, CA 95834 <br />(916) 921-9600 <br />FAX (916) 921-0100 <br />www.sequoialabs.com <br />Kleinfelder - Stockton Project: Northbrook 5308269 <br />2825 East Myrtle Street Project Number: 34202.E01 Reported: <br />Stockton CA, 95205 Project Manager: Joe Zilles 08/20/03 17:53 <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 Nates <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-BS1) 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 />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 />Paee 24 of 29 <br />