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404 N Wigettane , <br /> Sequoia walnut Creek CA 94590 <br /> 4 (925)988 9600 <br /> FAX(925)988 973 <br /> ta)�,,,� Analytical www sequoialabs com I <br /> Secor-Rancho Cordova Project Arco ' <br /> 3017 Kilgore Rd Ste #100 Project Number Arco# 4932 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 26-Jul-01 12 27 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control ' <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spiker Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPE) Limit Notes ' <br /> Batch IG20011 - EPA 5030B (PIT) <br /> Blank(1G200I1-BLK2) Prepared&Analyzed 24-Jul-01 <br /> Ethanol ND 500 ug/l ' <br /> tent-Butyl alcohol ND 20 <br /> Methyl tent-butyl ether ND 20 , <br /> Di-isopropyl ether ND 20 <br /> Ethyl tert-butyl ether ND 20 " <br /> tort-Amyl methyl ether ND 20 ' <br /> 1,2 Dichloroethane ND 20 <br /> Ethylene dibromide ND 20 <br /> Surrogate Drbromofluoromethane 470 500 940 50-150 ' <br /> Surrogate 1 2-Dichloroethane-d4 450 -500 900 50-150 <br /> Blank(I G2001 1-BLK3) Prepared&Analyzed 25-Jul-01 <br /> Ethanol - - _- - ND 500 ugll <br /> tcrt-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether ND 20 " <br /> Di-isopropyl ether ND 20 ' <br /> Ethyl tert-butyl ether ND 20 " <br /> tort-Amyl methyl ether ND 20 " <br /> 1.2-Dichloroethane ND 20 <br /> Ethylene dibromtde ND 20 " <br /> Surrogate Dibromofluoromethane 560 500 112 50-150 <br /> Surrogate 1 1-Drchlorcethatred4 - - 520 —SO 0 _ -- 104 50-150 <br /> L.CS(IG20011-BSJ) Prepared&Analyzed 20-Jul-01 <br /> Methyl tert-butyl ether 492 20 ug(l 500 984 70-130 <br /> Surrogate Dibromofluoromethane 450 500 900 50-150 <br /> Surrogate 12-Dtchloroethaned4 480 500 960 50-150 <br /> Sequoia Analytical - Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain , <br /> custody document This analytical report must be reproduced in its entr <br /> Page II of 13 <br />