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4D (91Sequoia 819 Striker Avenue,Suite 8 Sacramento,CA 95834 TQF Analytical 6)921-9600 FAX(916)921-0100 Delta Environmental Consultants Project: Arco 2130,Stockton,CA Sampled: 9/28/99 3164 Gold Camp Drive,Ste.200 Project Number: N/A Received: 9/29/99 Rancho Cordova,CA 95670 Project Manager: Ben Heningburg Reported: 9/30/99 Volatile Oxygenate Compounds by EPA Method 8260A Sequoia Analytical-Sacramento Batch Date Date Surrogate Reporting Analyte Number Prepared Analyzed Limits Limit Result Units Notes* DP-1-3.5 S909414-01 Soil Tert-butyl alcohol 9090315 9/29/99 9/29/99 10.0 ND mg/kg Methyl tert-butyl ether 0.100 ND " Di-isopropyl ether 0.100 ND " Ethyl tert-butyl ether 0.100 ND Tert-amyl methyl ether 0.100 ND " Surrogate: 1,2-DCA-d4 60.0-140 106 % DP-2-3.5 5909414-02 Soil Tert-butyl alcohol 9090315 9/29/99 9/29/99 10.0 ND mg/kg Methyl tert-butyl ether 0.100 ND " Di-isopropyl ether 0.100 ND " Ethyl tert-butyl ether 0.100 ND Tert-amyl methyl ether 0.100 ND Surrogate: 1,2-DCA-d4 60.0-140 95.2 % DP-3-3.5 5909414-03 Soil Tert-butyl alcohol 9090315 9/29/99 9/29/99 10.0 ND mg/kg Methyl tert-butyl ether 0.100 1.83 " Di-isopropyl ether 0.100 ND " Ethyl tert-butyl ether 0.100 ND " Tert-amyl methyl ether 0.100 ND " Surrogate: 1,2-DCA-d4 60.0-140 104 % DP4-3.5 S909414-04 Soil Tert-butyl alcohol 9090315 9/29/99 9/29/99 10.0 ND mg/kg Methyl tert-butyl ether 1. 1. 110.100 0.719 " Di-isopropyl ether 0.100 ND " Ethyl tert-butyl ether 0.100 ND " Tert-amyl methyl ether 0.100 ND " Surrogate: 1,2-DCA-d4 60.0-140 103 % PL-1-3.5 5909414-05 Soil Tert-butyl alcohol 9090315 9/29/99 9/29/99 10.0 ND mg/kg Methyl tert-butyl ether 0.100 ND " Di-isopropyl ether 0.100 ND " Ethyl tert-butyl ether 0.100 ND " Tert-amyl methyl ether 0.100 ND " Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. Page 5 of I 1