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404 N Wiget Lane ' Sequoia Walnut Creek CA 945% IDL (925)988-%W FAX(925)988-%73 %0Analytical v�sequolalabscom I Secor-Rancho Cordova Project Arco 3017 Kilgore Rd,Ste #100 Project Number Arco# 595,Stockton Reported ' Rancho Cordova CA,95670 Project Manager Clint Harms 07-Aug-01 13 12 Volatile Organic Compounds by EPA.Method 8260B' Sequoia Analytical - Walnut Creek Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes PSB-2,50'(W107431-10)Soil Sampled 19-Jul-01 00 00 Received 24-Jul-01 13 27 Ethanol ND 25 mg/kg 100 IG27018 31-Jul-01 02-Aug-01 EPA 8260B tert-Butyl alcohol ND 25 Methyl tert-butyl ether ND 020 Di-isopropyl ether ND 010 " Ethyl tert-butyl ether ND 0 10 ' tert-Amyl methyl ether ND 0 10 " 12-Dichloroethane ND 010 " 1,2-Dibromoethane ND 020 " Surrogate Dibromofluoromethane 936% 50-150 Surrogate 1,2-Dichloroethane-d4 '105% 50-150 " PSB-2,54'(W107431-11)Soil Sampled 19-Jul-01 00 00 Received 24-Jul-01 13 27 ' Ethanol ND 25 mg/kg 100 IG27018 31-Jul-01 02-Aug-OI EPA 8260B tert-Butyl alcohol ND 25 Methyl tert-butyl ether ND 020 Di-isopropyl ether ND 0 10 ' Ethyl tert-butyl ether ND 0 10 tent-Amyl methyl ether ND u t0 " 12-Dichloroethane ND 010 1,2-Dibromoethane ND 020 " Surrogate Dibromofluoromethane 108% 50-150 " Surrogate 1,2-Dichloroethane-d4 104% 50-150 ' PSB-2,64'(W107431-12)Soil Sampled 19-Jul-01 00 00 Received 24-Jul-01 13 27 Ethanol ND 25 mg/kg 100 1G27018 31-Jul-01 02-Aug-01 EPA 8260B tert-Butyl alcohol ND 2 5 Methyl tert-butyl ether ND 0 20 Di-isonronvl ether ND 0 10 " Ethyl tert-butyl ether ND 0 10 tert-Amyl methyl ether ND 0 10 " 1,2-Dichloroethane ND 010 " l,2-Dibromoet6ne ND 0 20 " Surrogate Dibromofluoromethane 102% 50-150 Surrogate `1 2-Dichloroethane-d4' - 100% ' 50-150 Sequoia Analytical - Walnut Creels The results in this report apply to the samples analyzed in accordance with the chain of custody document This analytical report must be reproduced in its entir0 Page 9of 15