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i 819 Stoker Avenue,Suite 955 <br /> Sequoia 8 <br /> ' Sacramento,G9 <br /> (916)921-96009600 <br /> FAX(916)921-0100 <br /> Analytical . °oalabs.com <br /> Kleinfelder-Stockton Project. KSN-Silva Trucking 5502127 <br /> 2825 East Myrtle Street Project Number. 52495 Reported: <br /> Stockton CA,95205 Project Manager: Francis Bean 02/23/05 12:34 <br /> DI STLC Extractable Hydrocarbons with Silica Gel Cleanup by EPA 8015B - Quality Control <br /> Sequoia Analytical - Sacramento <br /> r Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> DI STLC CAM Metals by EPA 6000/7000 Series Methods - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> J Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5620273-General Preparation/EPA 7196 <br /> Blank(5020273-BLKI) Prepared&Analyzed: 02/16/05 <br /> Hexavalent Chromium 0.0430 0.0050 mg/I QB02 <br /> Laboratory Control Sample(5020273-BSI) Prepared&Analyzed: 02/16/05 <br /> Hexavalent Chromium 0.0507 0.0050 mg/I 0.0500 101 85-115 <br /> Laboratory Control Sample Dup(5020273-BSD1) Prepared&Analyzed: 02/16/05 <br /> Hexavalent Chromium 0.0496 0.0050 mg/I 0.0500 99 85-115 2 200 <br /> r <br /> r <br /> r <br /> r <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 /> r This analytical report must be reproduced in its entirely. <br /> ` Page 8 of 9 <br />