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404N Wiget Lane a— ) (925)988-M Sequoia Walnut Creek,CA 94598 Anal ica FAX(925)988-9613 www spgaoialabs can Secor-Rancho Cordova Project Arco 3017 Kilgore Rd,Ste #100 Project Number Arco#4932,Stockton Reported Rancho Cordova CA,95670 Project Manager Rusty Benkosky 24-Jul-02 12 03 Volatile Organic Compounds by EPA Method 8260B Sequoia Analytical-Walnut Creek Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes DMW-3,30206289-07)Soil Sampled 12-Jun-02 09 10 Received 14-Jun-02 08 55 _ tert-Butyl alcohol ND 2 5 mg/kg 100 2F25021 20-Jun-02 26-Jun-02 EPA 8260B Methyl tert butyl ether(MTBE) 083 020 " Di-isopropyl ether ND 0 10 " Ethyl tent-butyl ether ND 010 " tert-Amyl methyl ether ND 010 " I,2-Dichloroethane ND 010 " 1,2-Dibromoethane ND 020 Surrogate DibromoJluoromethane 108% 50-150 " Surrogate 12 Dichloroethane-d4 988% 50-150 " DMW_3,_35'(W206289-08)Soil Sampled 12-Jun-02 09-15 Received 14-.Tun-02 08 55 tert-Butyl alcohol ND 25 mg/kg 100 2F25021 20-Jun-02 26-Jun-02 EPA 8260B Methyl tert-butyl ether(MTBE) 9 5 020 Di-isopropyl ether ND 010 " ,,,,,Ethyl tert-butyl ether ND 010 " -Amyl methyl ether ND 010'qW " ,2-Dichloroethane ND 010 ^ " 1,2-Dibromoethane ND 020 " Surrogate Dibromofluoromethane 116% 50-150 Surrogate 12 Dichloroethane-d4 944% 50-150 " DMW-3,50'(W206289-09)Soil Sampled 12-Jun-02 09 40 Received 14-Jun-02 08 55 _ tert-Butyl alcohol ND 2 5 mg/kg 100 2F25021 20-Jun-02 26-Jun-02 .'-EPA 8260B Methyl tert-butyl ether(MTBE) 13 040 200 26-Jun-02 " Di-isopropyl ether ND 010 100 26-Jun-02 " Ethyl tert-butyl ether ND 014 ^ tert-Amyl methyl ether ND 010 1,2-Dichloroethane ND 010 " 1,2-Dibromoethane ND 020 " Surrogate Dibromojluoromethane 118% 50-150 " Surrogate 1,2-Dichloroethane-d4 984% 50-150,lo quota 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 22 of 38