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' 404 N Wiget lane Sequoia Walnut Creek to 94598 (925)988-9600 Analytical FAX equo alabs c 73 www serquolalabs com Secor-Rancho Cordova Project Arco 3017 Kilgore Rd, Ste #100 Project Number Arco# 595, Stockton Reported Rancho Cordova CA,95670 Project Manager Rusty Benkosky 29-Aug-01 11 26 ' Volatile Organic Compounds by EPA Method 8260B Sequoia Analytical - Walnut Creek Reporting nalyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes PSB-1,98(W107334-01)Soil Sampled 17-Jul-01 00 00 Received 19-Jul-01 14 20 Fi--Butyl alcohol ND 2 5 mg/kg 100 IG27018 26-Jul-01 28-Jul-01 EPA 8260E ethyl tert-butyl ether(MTBE) ND 020 Isopropyl ether ND 010 Ethyl tert-butyl ether ND 0 10 " trt-Amyl methyl ether ND 010 " 2-Dichloroethane ND 010 " 1,2-Dtbromoethane ND 020 " 1urrogale Dibromofluoromethane 720% 50-150 urrogate 12-Dichloroethane-d4 904% 50-150 PSB1,75'(W107334-02)Water Sampled 18-Jul-01 11 00 Received 19-Jul-01 1420 thanol ND 500 ug/l I 1G26012 28-Jul-01 28-Jul-01 EPA 8260B rt-Butyl alcohol ND 20 ^ " Methyl tert-butyl ether(MTBI ) 33 20 " ropyl ether ND 20 " IffiWrt-buityl ether ND 20-te " rt-Amyl methyl ether ND 20 " 1,2-Dlchloroethane 2 8 20 " thylene dlbromtde ND 20 " urrogate Dibromofluoromethane 940% 50-150 " Surrogate 1,2-Dichloroethane-d4 956% 50-150 " FSBI,90'(WI07334-03)Water Sampled 19-Jul-01 14 00 Received 19-Jut-01 14 20 'Ethanol ND 500 ugA 1 tG26012 28-Jul-01 28-Jul-01 EPA 8260B tert-Butyl alcohol ND 20 ethyl tert-butyl ether(MTBE) 39 20 isopropyl ether ND 20 Ethyl tert-butyl ether ND 20 " e ft.-Amyl methyl ether ND 20 2-Dlchloroethane 10 20 dlbromtde ND 20 " furrogate Dibromoflucromethane 84 4% 50-150 ~� rrogate 1 2-Dichloroethane-d4 914% 50-150 " ea Analytical-Walnut Creek 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 entirety Page 3 of 13