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14 Sequoia 0 <br />WOAnalytical <br />. 404 N. Wiget Lane <br />Walnut Creek, CA 94598 <br />(925)988-9600 <br />FAX (925) 988-9673 <br />www.sequoialabs.com <br />Secor - Rancho Cordova Project: Arco <br />3017 Kilgore Rd., Ste. #100 Project Number: Arco # 2133, Stockton Reported: <br />Rancho Cordova CA., 95670 Project Manager: Rusty Benkosky 14 -Aug -02 13:16 <br />Conventional Chemistry Parameters by APHA/EPA Methods - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch 2HO6002 - EPA 3550A Sonicate <br />Blank (2H06002-BLKI) <br />MPH <br />LCS (2H06002-BS1) <br />TRPH <br />LCS Dup (2H06002-BSD1) <br />TRPH <br />Matrix Spike (2H06002 -MSI) <br />TRPH <br />Matrix Spike Dup (2H06002-MSD1) <br />TRPH <br />Prepared & Analyzed: 06 -Aug -02 <br />ND 50 mg/kg <br />Prepared & Analyzed: 06 -Aug -02 <br />485 50 mg/kg 500 97.0 70-130 <br />Prepared & Analyzed: 06 -Aug -02 <br />492 50 mg/kg 500 98.4 70-130 1.43 30 <br />Source: W208041-01 Prepared & Analyzed: 06 -Aug -02 <br />499 50 mg/kg 500 ND 99.8 60-140 <br />Source: W208041-01 Prepared & Analyzed: 06 -Aug -02 <br />499 50 mg/kg 500 ND 99.8 60-140 0.00 30 <br />Sequoia Analytical - Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br />custody document. This analytical report must be reproduced in its entirety. <br />Page 18 of 20 <br />