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404 N Wiget Lane Sequoia Walnut Creek CA 94598 (925)988-9600 Analytical www (925)988-9673 www sequolalabs corn 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 nalyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes in-2,70'(WI07431-13)Soil Sampled 19-Jul-01 00 00 Received 24-Jul-01 13 27 thanol ND 25 mg/kg 100 1G27018 31-Jul-01 02-Aug-01 EPA 8260B rt-Butyl alcohol ND 2 5 " ethyl tert-butyl ether ND 020 " Di-isopropyl ether ND 010 ^ " Ithyl tert-butyl ether ND 010 rt-Amyl methyl ether ND 010 1,2-Dichloroethane ND 010 " ,2-Dibromoethane ND 020 " urrogate Dibromofluoromethane 90 8% 50-150 — urrogate 12-Dichloroethane-d4 964% 50-150 " SB-2,88-(W 107431-14)Soil Sampled 19-Jul-01 00 00 Received 24-Jul-01 13 27 thanol ND 25 mg/kg 100 1G27018 31-Jul-01 02-Aug-01 EPA 8260B tent-Butyl alcohol ND 2 5 " tert-butyl ether ND 020 " ropyl ether ND 010 (thOytert-butyl ether ND 010 tert-Amyl methyl ether ND 010 " 12-Dibromoethane 2-Dichloroethane ND 010 ND 0 20 " Surrogate Dibromofluoromethane 912% 50-150 " rrogate 12-Dichloroethane-d4 964% 50-150 SB-2,98'(W107431-15)Soil Sampled 19-Jul-01 00 00 Received 24-Jul-01 13 27 Ethanol ND 25 mg/kg 100 1 G27018 31-Jul-01 02-Aug-01 EPA 8260E Irt-Butyl alcohol ND 25 n N n ethyl tert-butyl ether ND 020 " Di-isopropyl ether ND 010 thyl tert-butyl ether ND 010 ^ -Amyl methyl ether ND 010 " ^ ,2-Dichloroethane ND 010 1,2-Dibromoethane ND 020 " ^ urrogate Dibromofluoromethane 93 2% 50-150 urrogate 1 2-Dichloroethane-d4 972% 50-150 " equoia 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 10 of 15