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404 N Wiget Lane , <br /> 4FAX1 Sequoia Walnut Creek CA 94598 <br /> (925)988-9600 <br /> � Analytical w <br /> (925)9 -9673 <br /> www sequolalabs corn ' <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 Betikosky 29-Aug-01 11 26 <br /> Volatile Organic Compounds by EPA Method 82GOB - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %RLC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1627018- EPA 5030B(MeOH) <br /> Blank(1G27018-BLKI) Prepared 26-Jul-01 Analyzed 27-Jul-01 <br /> tert-Butyl alcohol _ ND- 25 mg/kg <br /> Methyl tert-butyl ether(MTBE) ND 020 " <br /> Di-isopropyl ether ND 0 10 <br /> Ethyl Cert-butyl ether ND 010 ' <br /> ten-Amyl methyl ether ND 0 to " <br /> 12-Dichloroethane ND 010 <br /> 1,2-Dibromoethane ND 020 " <br /> Surrogate Dibromof7uoromethane 239 250 956 50-150 <br /> Surrogate 1 2-Dichloroethane-d4 233 250 932 50-150 <br /> Blank(IG27018-BLK2) Prepared 26-Jul-01 Analyzed 28-Jul-01 <br /> tert-Butyl alcohol ND 25 mg/kg T�- <br /> Methyl tert-butyl ether(MTBE) ND 020 <br /> Di-isopropyl ether ND 010 <br /> Ethyl Cert-butyl ether ND 010 " <br /> test-Amyl methyl ether ND 010 " <br /> 1,2-Dichloroethane ND 010 <br /> 1,2-Dibromoethane _ —_ ND— _ _ _-0 20 <br /> Surrogate Dibromofluoromethane 233 250 932 50-150 ' <br /> Surrogate 1 1-Dichloroerhane-d4 - 252 -- 250 101 50-150 <br /> Blank(1G27018-BLK3) Prepared 31-Jul-01 Analyzed 01-Aug-01 <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 010 " <br /> tert-Amyl methyl ether ND 0 10 <br /> 1 2-Dichloroethane ND 010 " <br /> 1,2-Dibromoethane ND 020 <br /> Surrogate Dibromofluoromethane 237 250 948 50-150 <br /> Surrogate 1 2-Dichloroelhane-d4 237 250 948 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 entirels <br /> Page 10 of 13 <br /> i <br />