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404N Wiget Lane <br /> Sequoia Walnut Creek,CA 94598 <br /> qWA (925)968-9600 <br /> Analytical FAX(925)988-9673 <br /> www sequotalabs can <br /> Secor-Rancho Cordova Project BP <br /> 3017 Kilgore Rd,Ste #100 Project Number BP#595,Stockton Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 15-Jul-02 12 49 <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 2GO8015-EPA 5030B McOH <br /> Blank(2G08015-BLKI) Prepared 01-Jul-02 Analyzed 08-Jul-02 <br /> Ethanol ND 25 mg/kg <br /> tert-Butyl alcohol ND 25 <br /> Methyl tert-butyl ether(MTBE) ND 020 " <br /> Di-isopropyl ether ND 010 " <br /> Ethyl tert-butyl ether ND 0 10 " <br /> tert-Amyl methyl ether ND 010 " <br /> 1,2-Dichloroethane ND 010 <br /> 1,2 Dibromoethane ND 020 " <br /> Surrogate Dibromofluoromethane 237 250 948 50-150 <br /> Surrogate 12-Dichloroethane-d4 235 250 940 50-150 <br /> Blank(2G08015-BLK2) Prepared 02-Jul-02 Analyzed 10-Jul-02 <br /> Ethanol ND 25 mpg <br /> Wert-Butyl alcohol ND 25 <br /> ethyl tert-butyl ether(MTBE) ND 020 <br /> Di-isopropyl ether ND 010 " <br /> Ethyl tert-butyl ether ND 010 " <br /> tent-Amyl methyl ether ND 010 " <br /> 1,2-Dichloroethane ND 010 " <br /> 1,2-Dibromoethane ND 020 <br /> Surrogate Dibromofluoromethane 331 250 132 50-150 <br /> Surrogate 12-Dichloroethane-d4 313 150 125 50-150 <br /> LCS(2G08015-BSI) Prepared 01-Jul-02 Analyzed 08-Jul-02 <br /> Methyl tert-butyl ether(MTBE) 233 020 mg/kg 250 932 70-130 <br /> Surrogate Dibromofluoromethane 260 250 104 50-150 <br /> Surrogate 1 2-Dichloroethane-d4 241 250 964 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 to its entirety <br /> Page 20 of 22 <br />