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404 N Wiget Lane <br /> Sequoia Walnut Creek,CA 945% <br /> Analytical (925)988-9600 <br /> Aalytical T T FAX <br /> www se oialabs can <br /> Secar-Rancho Cordova Project Arco <br /> 3017 Kilgore Rd,Ste 4100 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 8260B- 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 2F25021-EPA 5030B(MeOH) <br /> Blank(2F25021-BLKI) Prepared 20-Jun-02 Analyzed 24-Jun-02 <br /> Ethanol ND 25 mg/kg <br /> tert-Butyl alcohol ND 25 " <br /> Methyl tert-butyl ether(MTBE) ND 020 " <br /> Di-isopmpyl ether ND 010 " <br /> Ethyl tert-butyl ether ND 010 " <br /> tert-Amyl methyl ether ND 010 " <br /> 1,2-Dichlomethane ND 010 " <br /> 1,2-Dibromoethane ND 020 " <br /> Surrogate DibromoJluoromethane 241 " 250 964 50-150 <br /> Surrogate 12-Dichloroethane-d4 120 250 880 50-150 <br /> Blank(2F25021-BLK2) Prepared 2l-Jun-02 Analyzed 25-Jun-02 <br /> W-B:l <br /> ND25 mg/kg <br /> tyl alcohol ND 25 " <br /> Methyl tert-butyl ether(MTBE) ND 020 " <br /> DI-isopropyl ether ND 010 <br /> Ethyl tert-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 DibromoJlucromethane 169 250 108 50-150 <br /> Surrogate 12-Dichloroethane-d4 365 250 146 50-150 <br /> LCS(2F25021-BS1) Prepared 20-Jun-02 Analyzed 24-Jun-02 <br /> Methyl tert-butyl ether(MTBE) 268 040 mg/kg 250 107 70-130 <br /> Surrogate DibrornoJluoromethane 214 250 856 50-150 <br /> Surrogate 12-Dichloroethane-d4 185 250 740 50-150 <br /> equoia Analytical-Walnut Creek The results in this report apply to the samples analysed in accordance with the chain of <br /> custody document chis analytical report must be reproduced in its entirety <br /> Page 36 of 38 <br />