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1404 N Wiget Lane Sequoia Walnut Creek CA 94598 (925)988-9640 Analytical wFAX(925) 73 ww sequolalabs alabs com (Rancho or-Rancho Cordova Project Arco 7 Kilgore Rd,Ste #100 Project Number Arco#595,Stockton Reported Cordova CA,95670 Project Manager Clint Harms 07-Aug-01 13 12 ' Volatile Organic Compounds by EPA Method 8260B Sequoia Analytical- Walnut Creek Reporting nalyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes PSB-1,50'(W107431-01)Soil Sampled 17-Jul-01 00 00 Received 24-Jul-01 13 27 fhanol ND 25 mg/kg 100 IG27018 31-Jul-01 31-Jul-0I EPA 8260B rt-Butyl alcohol ND 2 5 " ethyl tert-butyl ether ND 020 " Di-isopropyl ether ND 010 " thyl tert-butyl ether ND 010 rt-Amyl methyl ether ND 010 1,2-Dichloroethane ND 010 " 2-Dibromoethane ND 020 " arrogate Dibromofluoromethane 992% 50-150 " Surrogate 1,2-Dichloroethane-d4 988% 50-150 " ISB-1,60'(W107431-02)Soil Sampled 17-Jul-01 00 00 Received 24-Jul-01 13 27 thanol ND 25 mg/kg 100 1G27018 31-Jul-01 31-Jul-01 EPA 8260B tert-Butyl alcohol ND 25 *12"tert-buty ether ND 020 JAWopyl ether ND 010 " thyl tert-butyl ether ND 010 ^ " Cert-Amyl methyl ether ND 010 ^ 1 2-Dichloroethane ND 010 " ,2-Dibromoethane ND 020 " Surrogate Dibromofluoromethane 980% 50-150 " Lurrogate 12-Dichloroethane-d4 101 % 50-150 -1,70'(W107431-03)Soil Sampled 17-Jul-01 00 00 Received 24-Jul-01 13 27 Ethanol ND 25 mg/kg 100 IG27018 31-Jul-01 31-Jul-01 EPA 8260B Butyl alcohol ND 25 ethyl tert-butyl ether ND 020 Di-isopropyl ether ND 010 ("2-Dthyl tert-butyl ether ND 010 ichloroethane rt-Amyl methyl ether ND 010 ND 010 1,2-Dibromoethane ND 020 turrogate Dibromofluoromethane — 96 0% 50-150 urrogate 1 2-Dichloroethane-44 102% 50-150 " I quoia 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 I f Page 6 of 15 1