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404 N Wiget Lane ' <br /> ' Sequoia Walnut Creek C94598 <br /> (925)988 8 96pp <br /> FAX(925)988%73 ' <br /> Analyticalwww sequoialabs cotn <br /> Secor-Rancho Cordova Project Arco <br /> 3017 Kilgore Rd Ste #100 Project Number Arco#4932,Stockton Reported ' <br /> Rancho Cordova CA 95670 Project Manager Rusty Benkosky 27-Jul-01 14 25 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Walnut Creek ' <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes ' <br /> i.11-2,78'(W 107244-04)Sod Sampled 11-Jul-010000 Received 13-Jul-01 13 35 <br /> tat-Butyl alcohol ND 2 5 mg/kg 100 IG25009 25 Jul-01 25-Jul 01 EPA 826013 <br /> Methyl ten-butyl ether ND 020 <br /> fit-isopropyl ether ND 0 10 <br /> :thyl tert-butyl ether ND 0 10 " <br /> ert-Amyl methyl ether ND 010 <br /> 1,2-Dichloroethane ND 010 " <br /> 1,2-Dibromoethane ND - -_- 020 "- -- - —r -----�T --- - - <br /> 5urrogate Drbromofluoromelhane 113% 50-150 ' <br /> surrogate 1 2-Dichloroethane-d4 984% 50-150 <br /> ;B-2,33'(W107244-05)Water Sampled 12-Jul-010900 Received 13-Jul-01 13 35 <br /> ert-Butyl alcohol ND 1000 ug/l 50 1620011 24-Jul-01 24-Jul-01 EPA 8260B ' <br /> Methyl tert-butyl ether 360000 10000 5000 27-Jul-01 A-03 <br /> Di-isopropyl ether ND 100 " 50 24 Jul-01 " <br /> Ethyl tert-butyl ether ND 100 ;; • <br /> tert-Amyl methyl ether 300 100 ' <br /> 1,2-Dichloroethane ND 100 " <br /> Ethylene dibromide ND 100 " <br /> Surrogate Dibromofluoromethane 101 % 50-150 <br /> Surrogate 12-Dichloroethane-d4 952% 50-150 " <br /> SB-2,50'(W107244-06)Water Sampled 12-Jul-011000 Received 13-Jul-011335 <br /> tert-Butyl alcohol 1100 20 ug/l 1 1G20011 24-Jul-01 24-Jul-01 EPA 8260B ' <br /> Methyl tert-butyl ether 37000 200 100 " 27-Jul-01 A-03 <br /> Di-isopropyl ether ND 20 1 " 24-Jul-01 " <br /> Ethyl tent-butyl ether ND 20 ' <br /> Cert-Amyl methyl ether ND 20 " <br /> 1,2-Dichloroethane 370 100 50 25-Jul-01 " <br /> Ethylene dibromide ND 2 0 1 24-Jul-01 N ' <br /> Surrogate Dibromofluoromethane 106% 50-150 " <br /> Surrogate 1,2-Dichloroethane-d4 392% 50-150 S-04 <br /> Sequoia Analytical - Walnut Creek The results in this report apply to the samples analyzed in accordance with the charn of ' <br /> custody document Ars analytical report must be reproduced:n its entir0 <br /> Page 5 of 15 , <br />