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i 404 N Wiget Lane , Sequoia Walnut Creek C8 96W 9 (925)9a8� 4 FAX(92.5)988%73 , � !70— Analytical �sequoialabs corp Secor-Rancho Cordova Project Arco , 3017 Kilgore Rd Ste #1100 Project Number Arco#4932,Stockton Reported Rancho Cordova CA 95670 Project Manager Rusty Benkosky 31-Jul-01 1f567 Volatile Organic Compounds by EPA Method 8260B ' Sequoia Analytical - Walnut Creek Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes ' NW6,15' (W[07294-07)Sod Sampled 13-Jul-01 00 00 Received 17-Jul-01 14 25 ert-Butyl alcohol ND 2 5 mg/kg 100 1 G2701 26-Jul-01 27-Jul 01 LPA 8260B ' Methyl tert-butyl ether ND 020 " Di-isopropyl ether ND 0 10 " Ethyl ten-butyl ether ND 0 10 " tert-Amyl methyl ether ND 0 10 I2-Dichloroethane ND 010 " 2-Dibromoethane ND 020 " Surrogate Dibromofluoromeihane 908% 50-150Y Surrogate 1 2-13ichloroethane-d4 972 % 50-150 " MW6,20'(W107294-08)Sod Sampled 13-Jul-01 00 00 Received 17-Jul-01 14 25 icri-Butyl alcohol ND 2 5 mg/kg 100 1G27018 26-Jul-01 27-Jul 01 EPA 8260B , Methyl tert-butyl ether ND 020 " Di-isopropyl ether ND 0 10 " Ethyl tert-butyl ether ND 0 10 •' tert-Amyl methyl ether ND 010 1,2-Dichloroethane ND 010 12-Dibromoethane ND 020 " Surrogate Dibromofluoromethane 868% 50-150 , Surrogate 12-Dtchloroethane-d4 976% 50-150 " MW6,25'(W107294-09)Sod Sampled 13-Jul-01 00 00 Received 17-Jul-01 14 25 ' tert-Butyl alcohol ND 25 mglkg 100 IG27018 26-Jul-01 27-Jul-01 EPA 8260E Methyl tent-butyl ether ND 020 Di-isopropyl ether ND 010 Ethyl tett-butyl ether ND 0 10 tert-Amyl methyl ether ND 010 1,2-Dichloroethane ND 010 " 1,2-Dibromoethane ND 020 Surrogate Dtbromofluoromethane 788% 50-150 " Surrogate 1,2-Dtchloroethane-d4 976% 50-150 " Sequoia Analytical - Walnut Creek The results in this report apply to the samples analyzed in accordance with the chat custody document 77us analytical report must be reproduced in its enn Page 7 of 13 i��