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ID (91SC 819 Striker Avenue,Suite 8 equoia Sacramento,CA 95834 Analytical FAX 6)921-9600 (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* PL-1-3.5(continued) 5909414-05 Soil Surrogate: 1,2-DCA-d4 60.0-140 103 % PL-2-3.5 S909414-06 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 % PL-3-4.5 S909414-07 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 71 11 1160.0-140 104 % PL4-5.5 S909414-08 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 60.0-140 110 % PL-54.5 S909414-09 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 60.0-140 104 % PL-6-3.5 S909414-10 Soil Tert-butyl alcohol 9090315 9/29/99 9/29/99 10.0 ND mg/kg Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. Page 6 of 11