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404 N Wiget Lane , <br /> Sequoia Walnut Creek CA 9459$ <br /> 4�i) (925)988 9600 <br /> fAX(925) 967n I IQF <br /> Analytical www sequoialaalabs corn <br /> Secor-Rancho Cordova Project Arco ' <br /> 3017 Kilgore Rd, Ste #100 Project Number Arco N 4932 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 26-Jul-01 1!27 <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 Lt vel Result %RFC Limits RPD Limit Notes <br /> Batch 1G16023- EPA 5030B(P/T) <br /> Blank(1G16023-BLKI) Prepared cC Analyzed 16-Jul-01 ' <br /> Ethanol ND 25 mg/k-, <br /> tert Butyl alcohol ND 2 5 <br /> Methyl ten-butyl ether ND 020 , <br /> Di-isopropyl ether ND 0 10 " <br /> Ethyl tert-butyl ether ND 010 " <br /> tert-Amyl methyl ether ND 010 ' <br /> 12-Dichloroethane ND 010 " <br /> 2-Dibromoethane ND 020 " <br /> Surrogate Dibrornofluoromethane 245 250 980 50 150 ' <br /> Surrogate 12-Dichloroethane-d4 100 250 800 50-150 <br /> Blank(1G16023-BLK2) Prepared&Analyzed 20-Jul-01 <br /> Ethanol - - ND—� 25 mg/kg --� —Y •' <br /> tert-Butyl alcohol ND 25 " <br /> Methyl tent-butyl ether ND 020 " <br /> Di-isopropyl ether ND 010 ' <br /> Ethyl tert-butyl ether ND 010 " <br /> cert-Amyl methyl ether ND 010 " <br /> 1.2-Dichloroethane ND 010 ' <br /> 1,2-Dtbromoethane ND 020 " <br /> Surrogate Drbromofluoromethane 2 SS " 150 102 50-150 <br /> Surrogate 12-Dichforaethone-d4 235 250 940 50-150 ' <br /> LCS(1G16023-BS1) Prepared&Analyzed 16-Jul-01 <br /> Methyl tert-butyl ether 269 020 mg/kg 250 108 70-130 <br /> Surrogate Dibromofluoromethane 235 250 940 50-150 , <br /> Surrogate 1 2-Drchloroethane-d4 190 250 760 50-150 <br /> Sequoia Analytical- Walnut Creek The results in this report apply to the samples analyzed in accordance wuh theclra+n <br /> custody document This analytical report must be reproduced rn r1s entry <br /> Page 9 of 13 <br />