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• • 404 N. Wiget Lane <br />IDFAXSequoia Walnut Creek, 98 94598 <br />-9600(925) 988-9600 (925) 988-9673 <br />VQFAnalytical 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 />Diesel Hydrocarbons (C10 -C23) by DHS LUFT - 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 2G30017 - EPA 3550A <br />Blank (2G30017-BLK2) <br />Prepared & Analyzed: 05 -Aug -02 <br />Diesel Range Hydrocarbons (C 10-C28) <br />Surrogate: n-Octacosane <br />LCS (2G30017-BS2) <br />ND <br />3.13 <br />5.0 mg/kg <br />3.33 94.0 50-150 <br />Prepared & Analyzed: 05 -Aug -02 <br />Diesel Range Hydrocarbons (C10 -C28) <br />13.2 <br />5.0 mg/kg <br />15.0 88.0 60-140 <br />Surrogate: n-Octacosane <br />Matrix Spike (2G30017 -MSI) <br />2.94 <br />Source: W207416-03 <br />3.33 88.3 50-150 <br />Prepared: 30 -Jul -02 Analyzed: 01 -Aug -02 <br />Diesel Range Hydrocarbons (CIO -C28) <br />14.4 <br />5.0 mg/kg <br />16.7 5.9 50.9 50-150 <br />Surrogate: n-Octacosane <br />Matrix Spike Dup (2G30017-MSDI) <br />2.39 <br />Source: W207416-03 <br />3.33 71.8 50-150 <br />Prepared: 30 -Jul -02 Analyzed: 01 -Aug -02 <br />Diesel Range Hydrocarbons (C 10-C28) <br />14.6 <br />5.0 mg/kg <br />16.7 5.9 52.1 50-150 1.38 50 <br />Surrogate: n-Octacosane <br />2.39 <br />3.33 71.8 50-150 <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 12 of 20 <br />