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1551 Industrial Road <br /> Sequoia San Carlos,CA 9422-4111 <br /> 4 (652)2332-9620 <br /> FAX(650) 232-9612 <br /> �,!D- Analytical www.sequolalabs.com, <br /> I :<y <br /> Gettler-Ryan/Geostrategics(1) Project: Tosoo(2) Sampled: 515100 <br /> 6747 Sierra Court,Suite D Project Number: Tosco(Unocal)SS#11195 Received: 515100 <br /> Dublin,CA 94568 Project Manager: Deanna Harding Reported: 5/22100 <br /> Volatile Organic Oxygenated Compounds by EPA Method 8260A <br /> Sequoia Analytical-San Carlos <br /> Batch Date Date Surrogate Reporting <br /> lAnalyte Number Prepared Analyzed Limits Limit Result Units Notes* <br /> MW-1 L005052-02 Water <br /> Tert-butyl alcohol 0050038 519100 5110100 2000 ND ug/l <br /> Methyl tert-butyl ether " " „ 40.0 1870 " <br /> Di4sopropyl ether " VI „ 40.0 ND <br /> Ethyl tert-butyl ether It <br /> it 40.0 ND <br /> Tert-amyl methyl ether If <br /> it It40.0 ND if <br /> Surrogate: 1,2-Dichloroethane-d4 If If IT76.0-114 105 % <br /> MW-2 L005052-03 Water <br /> Tert-butyl alcohol 0050059 5112100 5/12/00 167 ND ug/l <br /> Metbyl Cert-butyl ether of If <br /> It 3.34 258 " <br /> Di-isopropyl ether " It 3.34 ND <br /> Ethyl tert-butyl ether If3.34 ND <br /> Tert-amyl methyl ether If3.34 ND <br /> Surrogate: 1,2-Dichloroethane-d4 If " 76.0-114 109 % <br /> MWS L005052-04 Water <br /> Tert-butyl alcohol 0050038 519100 519/00 2500 ND ug/l <br /> Methyl tent-butyl ether " If „ 50.0 2410 ” <br /> Di-isopropyl ether " 50.0 ND <br /> Ethyl tert-butyl ether " 50.0 ND " <br /> Tert-amyl methyl ether „ It " 50.0 ND of <br /> Surrogate: 1,2 Dichloroethane-d4 " 76.0-114 103 % <br /> MW4 L005052-05 Water <br /> Tert-butyl alcohol 0050044 5110100 5110100 200 ND ug/l <br /> Methyl tent-butyl ether If <br /> it „ 4.00 302 " <br /> Di4sopropyl ether " 4.00 ND <br /> Ethyl-tert-butyl ether " 4.00 ND " <br /> Tert-amyl methyl ether If <br /> " 4.00 ND <br /> Surrogate: 1,1 Dichloroethane-d4 " " " 76.0-114 98.0 % <br /> MW-5 L005052-06 Water <br /> Tert-butyl alcohol 0050038 519100 5110100 5000 ND ug/l <br /> Methyl tort-butyl ether " of It 100 6070 " <br /> Di-isopropyl ether ofIft00 ND it <br /> Ethyl tent-butyl ether " It <br /> " 100 ND <br /> Tat-amyl methyl ether " of " too ND <br /> Surrogate: 1,2-Dichloroethane-d4 76.0-114 104 % <br /> MW-6 L005052-07 Water <br /> Tert-butyl alcohol 0050038 519/00 5/9/00 100 ND ug/l <br /> a <br /> Sequoia Analytical-San Carlos *Refer to end of report for text of notes and definitions. <br /> Page 5 of 13 <br />