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404 N W eget Lane <br /> Sequoia Walnut Creek,CA 94598 <br /> (925)988-9600 <br /> Analytical------ - ---- - — ---- -- — FAX(925)988-9673 -- <br /> -www se oialabs can <br /> Secor-Rancho Cordova Project Arco <br /> 3017 Kilgore Rd,Ste #100 Project Number Arco#4932,Stockton Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 24-Jul-02 12 03 <br /> Volatile Organic Compounds by EPA Method 8260E <br /> Sequoia Analytical-Walnut Creek <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> DMW-3,75'(W206289-13)Soil Sampled 12-Jun-02 10 20 Received 14-Jun-02 08 55 <br /> tert-Butyl alcohol ND 25 mg/kg 100 2F25021 20-Jun-02 26-Jun-02 EPA 8260E <br /> Methyl tert-butyl ether(MTBE) ND 020 " <br /> Di-isopropyl ether ND 010 " <br /> Ethyl tert-butyl ether ND 0 to " <br /> tert-Amyl methyl ether ND 010 " <br /> 1,2-Dichloroethane ND 014 " <br /> 1,2-Dibromoethane ND 020 " <br /> Surrogate Dibromojluoromethane 113% 50-150 " <br /> Surrogate 1 2-Dtchloroethane-d4 944% 50-150 " <br /> DMW-3,83'(W206289-14)Soil Sampled 12-Jun-02 10 50 Received 14-Jun-02 08 55 <br /> tert-Butyl alcohol ND 25 mg/kg 100 2F25021 20-Jun-02 26-Jun-02 EPA 8260B <br /> Methyl tert-butyl ether(MTBE) ND 020 " <br /> Di-isopropyl ether ND 010 <br /> thy]tert-butyl ether ND 010 <br /> rt-Amyl methyl ether ND 010 <br /> 1,2-Dichloroethane ND 010 " <br /> 1,2-Dibromoethane ND 020 t' " <br /> Surrogate DibromoJluoromethane 116% 50-150 " <br /> Surrogate 1,2-Dichloroethane44 920% 50450 " <br /> MW-10,20'(W206289-15)Sod Sampled 10-Jun-0210 40 Received 14-Jun-02 08 55 <br /> tett-Butyl alcohol ND 25 mg/kg 100 2F2502I 20-Jun-02 24-Jun-02 EPA 8260B <br /> Methyl tert-butyl ether(MTBE) ND 020 " <br /> Di-isopropyl ether ND 010 <br /> Ethyl text-butyl ether ND 010 " <br /> tert-Amyl methyl ether ND 010 " <br /> 1,2-Dichloroethane ND 010 " <br /> 1,2-Dibromoethane ND 020 " <br /> Surrogate DibromoJluoromethane 976% 50-150 " <br /> Surrogate 1,2-Dtchloroethane-d4 916% 50-150 Wequoia 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 24 of 3 8 <br />