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1 Sequoia 819 Striker Avenue, Suite 8 <br /> Sacramento, CA 95834 <br /> Analytical `916) 921-9600 <br /> FAX (91 G) 92 l-0 100 <br /> • <br /> SECOR International Project: ARCO 4493,Stockton,CA Sampled: 6/17/99 <br /> 9912 Business Park Drive, Ste. 100 Project Number. 7G600-604-02 Received: 6/17/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 7/6/99 <br /> Volatile Oxygenate Compounds by EPA Method 8260A <br /> Sequoia Analytical-Sacramento <br /> Batch Date Date Surrogate Reporting <br /> Analyte Number Prepared Analyzed Limits Limit Result Units Notes"` <br /> MW 1 5906315-01 Water <br /> Tert-butyl alcohol 9060306 6/21/99 6/21/99 200 ND ug/I <br /> Methyl tent-butyl ether 2.00 ND " <br /> Di-isopropyl ether 2,00 ND " <br /> Ethyl Cert-butyl ether 2.00 ND " <br /> Tert-amyl methyl ether 2.00 ND " <br /> 1,2-Dichloroethane or <br /> 2.00 ND <br /> Surrogate: 1,2-DCA-d4 or 60.0-140 102 % <br /> MW2 5906315-02 <br /> Water <br /> Tert-butyl alcohol 9060306 6/21/99 6/21/99 200 ND ug/l <br /> Methyl tert-butyl ether 2.00 ND " <br /> Di-isopropyl ether or 2.00 ND " <br /> tert-butyl ether 2.00 ND " <br /> 71WyI methyl ether 2.00 ND " <br /> 1,2-Dichloroethane 2.00 ND " <br /> Surrogate: 1,2-DCA-d4 60.0-140 106 % <br /> MW3 5906315-03 <br /> Water <br /> Tert-butyl alcohol 9060306 6/21/99 6/21/99 200 ND ug/I <br /> Methyl tert-butyl ether 2.00 144 " <br /> Di-isopropyl ether 2.00 ND " <br /> Ethyl tent-butyl ether 2.00 ND " <br /> Tert-amyl methyl ether 2.00 ND " <br /> 1,2-Dichloroethane 2.00 ND " <br /> Surrogate: 1,2-DCA-d4 60.0-140 102 % <br /> MW S906315-04 Water <br /> Tert-butyl alcohol 9060372 6124/99 6/24/99 1000 ND ug/l D <br /> Methyl tert-butyl ether " 10.0 766 D <br /> Di-isopropyl ether 10.0 ND D <br /> Ethyl tent-butyl ether 10.0 ND D <br /> Tert-amyl methyl ether 10.0 ND D <br /> 1,2-Dichloroethane 10.0 ND D <br /> Surrogate: 1.2-DCA-d4 60.0-140 101 % <br /> Sequoia Analytical -Sacramento *Refer to end of report for text of notes and def nitions. <br /> Page I I of 21 <br />