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Sequoia 819 Straker Avenue Suite Sacramento CA 958344 Analytical (91 ) 921 9100 FAX(9166)921-0 100 Is ECOR International-Sacramento Project ARCO 595, Stockton, CA Sampled 9110199 to 9/14/99 912 Business Park Dr, Ste 100 Project Number N/A Received 9/15/99 acramento,CA 95827 Project Manager Rusty Benkosky Reported 9/27/99 Volatile Oxygenate Compounds by EPA Method 8260A Sequoia Analytical-Sacramento Batch Date Date Surrogate Reporting Analyte Number Prepared Analyzed Limits Limit Result Units Notes* D-1(@,3' 5909240-01 Soil Tert-butyl alcohol 9090204 9/20/99 9/21/99 100 ND mg/kg Methyl tert-butyl ether 0 100 647 " Di-isopropyl ether 0 100 ND " Ethyl tent-butyl ether 0 100 ND " Tert-amyl methyl ether 0 100 ND " Ethanol " " 150 ND " 1,2-Dtchloroethane 0100 ND " Ethylene dtbromtde 0 100 ND — Surrogate 1 2-DCA-d4 600-140 956 % D-1 5' 5909240-02 Soil Tert-butyl alcohol 9090204 9/20/99 9/21/99 100 ND mg/kg Methyl tert-butyl ether 0 100 134Jft " propyl ether " " 0 100 ND tert-butyl ether 0 100 ND Tert-amyl methyl ether 0 100 ND " Ethanol 150 ND " 1,2-Dtchloroethane 0100 ND " Ethylene dtbromtde _ 0 100 ND_ " Surrogate 1,2-DCA-d4 600-140 808 % D-2(a)f 5909240-03 Soil Tert-butyl alcohol 9090204 9/20/99 9/21/99 100 ND mg/kg Methyl tert-butyl ether 0 100 0 699 " Di-isopropyl ether 0 100 ND " Ethyl tert-butyl ether 0 100 ND " Tert-amyl methyl ether 0 100 ND " Ethanol 150 ND " 1,2-Dtchloroethane 0100 ND " Ethylene dtbromtde _ 0 100 ND Surrogate 12-DCA-d4 600-140 828 % D-3(a)4 5' 5909240-04 Soil Tert-butyl alcohol 9090204 9/20199 9/21/99 100 ND mg/kg Methyl tert-butyl ether 0 100 0 802 " Di-isopropyl ether 0 100 ND " Ethyl tert-butyl ether 0 100 ND " Teri-amyl methyl ether 0 100 ND " Ethanol 150 ND " 1,2-Dichloroethane 0100 ND " ane.dtbromtde 0 100 ND " Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions Page 8 of 19