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Sequoia 444N WA 94598 Walnut Creek,CA 94598 —a—) Analytical -- _ (925)988-9600 FAX(925)988 9673 wwwse oialabscan------ Secor-Rancho Cordova Project Arco 3017 Kilgore Rd,Ste 000 Protect 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 MW-1_1301 206289-19 Soil Sampled 10-dun-02 15 40 Received 14-Jun-02 08 55 tert-Butyl alcohol ND 25 mg/kg 100 2F25021 20-Jun-02 24-Jun-02 EPA 8260E Methyl tert-butyl ether(MTBE) ND 020 " Di-isopropyl ether ND 0 10 Ethyl tert-butyl ether ND 010 " tert-Amyl methyl ether ND 010 " 1,2-Dichloroethane ND 010 1,2-Dibromoethane ND 020 " Surrogate Dibromofluoromethane 105% 50-150 " Surrogate 1,2-Dichloroethane-d4 110% 50-150 " MW-11,40'(W206289-20)Sod Sampled 10-Jun-021550 Received 14-Jun-02 08 55 - tert-Butyl alcohol ND 2 5 mg/kg 100 2F25021 20-Jun-02 24-Jun-02 EPA 8260B Methyl tert-butyl ether(MTBE) ND 020 " Di-isopropyl ether ND 010 " Ethyl tert-butyl ether ND 010 " Amyl methyl ether ND 010 " 1,2-Dichloroethane ND 010 " 1,2-Dibromoethane ND 020 " Surrogate Dtbromofluoromethane 102% 50-150 " Surrogate 1,2 Dichloroethane-d4 116% 50-150 " DMW-2,10'(W206289-21)Soil Sampled 11-Jun-02 09 00 Received 14-Jun-02 08 55 tert-Butyl alcohol ND 25 mg/kg 100 2F25021 21-Jun-02 25-Jun-02 EPA 8260B Methyl tert-butyl ether(MTBE) ND 020 " Di-isopropyl ether ND 010 Ethyl tert-butyl ether ND 0 10 " tert-Amyl methyl ether ND 010 1,2-Dichloroed=e ND 010 " 1,2-Dibromoethane ND 020 " Surrogate Dibromofluoromethane 105% 50-150 " " Surrogate 1,2-Dichloroethane-d4 944% 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 26 of 38