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Sequoia 819 Striker Avenue,Suite 8 Sacramento,CA 95834 ,C) (916)921-9600 %„- Analytical FAX(916)921-0100 Cambria Environmental Project: Equilon 440 W Charter Way,Stockton Sampled: 6/25/99 270 Perkins Street Project Number: 88870583 Received: 6/25/99 Sonoma,CA 95476 Project Manager: Wayne Chiu Reported: 6/29,7/8-9/99 Volatile Oxygenate Compounds by EPA Method 8260A Sequoia Analytical-Sacramento Batch Date Date Surrogate Reporting IAnalvte Number Prepared Analyzed Limits Limit Result Units Notes* T7- -17' (continued) 5906.317-11 Ssil Methyl tert-butyl ether 9070009 7/1/99 7/1/99 0.100 ND mg/kg Di-isopropyl ether 0.100 ND " Ethyl tert-butyl ether 0.100 ND " Tert-amyl methyl ether 0.100 ND " Surrogate: 1,2-DC4-d4 60.0-140 96.8 T8-N-17' 5906417-12 SUE Tert-butyl alcohol 9070009 7/1'99 7/1!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 " Teri-amyl methyl ether 0.100 ND " Surrogate: 1,2-DCA-d4 60.0-140 89.6 T8-S-17' S906417-13 53W Tert-butyl alcohol 9070009 7/1/99 7/1/99 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 92.4 T9-N-I 7' S906417-14 %W Tert-butyl alcohol 9070009 7/1/99 7/1/99 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 92.0 T9-CENTER-17' S906417-15 S4.11 Tert-butyl alcohol 9070010 7/1/99 7/1/99 10.0 ND mg/kg Methyl tert-butyl ether 0.100 ND " lei-icnnrnnvl ether 0.100 ND " Ethyl ter -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 9 of 18