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404 N Wiget Lane ' <br /> CFAX/ Sequoia Walnut Creek CA 94598 <br /> (925)988-9600 <br /> � Analytical <br /> 988-9673 <br /> www sequequoialabs Cpm ' <br /> Secor-Rancho Cordova Project Arco <br /> 3017 Kilgore Rd Ste #100 Project Number Arco# 595, Stockton Reported <br /> Rancho Cordova CA, 95670 Project Manager Rusty Benkosky 29-Aug-01 11 26 <br /> Volatile Organic Compounds by EPA Method 8260B W 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 1G27018- EPA 5030B(MeOH), <br /> Matrix Spike Dup(1G27018-MSD2) Source W107334-01 Prepared 26-Jul-01 Analyzed 28-Jul-01 <br /> Methyl tert-butyl ether(MTBE) 245 020 mg/kg 250 ND 980 60-140 588 25 <br /> Surrogate Dibromofluoromelhane 216 250 864 50-150 <br /> Surrogate 12-Dichloroethane-d4 232 250 928 50-150 ' <br /> ! <br /> ! <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 entire <br /> i <br /> Page 12 of 13 <br />