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404 N Wiget lane ' <br /> Sequoia Wainut Creek GA 94598 <br /> 4 <br /> {925}988 9600 <br /> !��, Analytical www <br /> (925)988 9673 ' <br /> sequoialabs corn <br /> Secor- Rancho Cordova Project Arco ' <br /> 3017 Kilgore Rd Ste 4100 Project Number Arco 4 4932,Stockton Reported <br /> Rancho Cordova CA,95670 Project Manager Fusty Benkosky 31-Jul-01 1f567 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control ' <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %REC RPD t <br /> Analyte Rcsult Limit Units Level Result %RLC Limits RPD Limit Notes <br /> Batch 1627018- EPA 50308(MeOH) <br /> Blank(1627018-BLKI) Prepared 26-Jul-01 Analyzed 27-Jul-01 <br /> en-Butyl alcohol ND 25 mg/kg <br /> Methyl Cert-butyl ether ND 020 <br /> Di-isopropyl ether ND 0 10 <br /> Ethyl tert-butyl ether ND 010 " <br /> ert Amyl methyl ether ND 010 <br /> l2-Dichloroethane ND 010 ' <br /> I 2-Dibromoethane ND 020 " <br /> Surrogate Drbromofluoromethone 2 39 v 250 T_ 956 50-150 <br /> Surrogate 1 2-Dichloroethane-d4 233 250 932 50-150 ' <br /> Blank(1G27018-BLK2) Prepared 26-Jul-01 Analyzed 28-Jul-01 <br /> cert-Butyl alcohol ND -----T5 mg/kg <br /> 'Methyl tort-butyl ether 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 /> 1,2-13tbromoethane ND 020 " <br /> Surrogate Dibromofluoromethane 133 250 932 50-150 ' <br /> Surrogate 1 2-Drchloroethane-d4 252 150 101 50-150 <br /> LCS(IG27018-BSI) Prepared 26-Jul-01 Analyzed 27-Jul-01 <br /> Methyl Cert-butyl ether Y - - — - 247 020 mg/kg 250 988 70-130 <br /> Surrogate Dtbromofluoromethane 157 250 103 50-150 <br /> Surrogate 1 1-Drchloroethane-d4 146 250 984 50-150 <br /> l,CS(IG27018-BS2) Prepared 26-Jul-01 Analyzed 28-Jul-01 <br /> Methyl Cert-bury!ether �- 2 13 020 mg/kg 250 852 70-130 <br /> Surrogate Drbromofluoromethane W 239 250 956 50-150 <br /> Surrogate 12-Dichloroethane-d4 146 150 984 50-150 t <br /> Sequoia Analytical - Walnut Creek The results in this report apply 10 the samples analyzed in accordance with the chat ' <br /> custody document This analytical report must be reproduced in its entry <br /> Page II of 13 <br />