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4DSequoia 819 Straker Avenue Suite 8 Sacramento CA 95834 Analytical (916) 921-9600 FAX(9 16) 92 I-0100 • SECOR International-Sacramento Project ARCO 595 Stockton, CA Sampled 9/10/99 to 9/14/99 9912 Business Park Dr,Ste 100 Project Number N/A Received 9115/99 Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 9127199 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-3(a),4 5'(continued) 5909240-04 Soil Surrogate 12-DCA-d4 9090204 9/20/99 9/21/99 600-140 82 4 D-4 5' S909240-05 Soil Tert-butyl alcohol 9090204 9/20/99 9/21/99 100 ND mg/kg Methyl tert-butyl ether 0 100 161 " 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-Dichloroethane 0100 ND " Ethylene dibromide 0 100 T ND Surrogate 1 2-DCA-d4 f 600-140 83 6 utV 5909240-06 Soil tyl alcohol 9090204 9/20/99 9/21/99 100 ND mg/kg Methyl tert-butyl ether 0 100 100 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-Dichloroethane 0100 ND " Ethylene dibrommde 0 100 ND " Surrogate 1 2-DCA-d4 600-140 840 PL,-1(4)41' S909240-07 Soil Tert-butyl alcohol 9090204 9/20/99 9/21199 100 ND mg/kg Methyl tert-butyl ether 0 100 126 " 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-Dichloroethane 0100 ND " Ethylene dibromide 0 100 ND Surrogate 1 2-DCA-d4 600-140 884 % PL-2Q5' 5909240-08 Soil Tert-butyl alcohol 9090204 9/20/99 9/21/99 100 ND mg/kg Methyl tert-butyl ether 0 100 0 229 " Di-isopropyl ether 0 100 ND " Ethyl tert-butyl ether 0 100 ND " T yl methyl ether 0 100 ND " Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions Page 9 of 19