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M <br /> Sequoia 819 Striker Avenue Suite 8 <br /> 6 Sacramento CA 95834 <br /> (916)921-9600 <br /> Analytical <br /> FAX(916)921-0100 <br /> EMCON/IT-Sacramento Project ARCO 2130 Stockton, CA Sampled 3/16/00 <br /> 1433N Market Blvd,#1 Project Number 803879 Received 3/17/00 <br /> Sacramento,CA 95834 Project Manager Dave Foley Reported 3/24/00 <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-6(72')(continued) S003246-06 Water <br /> Methyl tent-butyl ether 0030239 3/24/00 3/24/00 200 ND ug/1 <br /> Di-isopropyl ether 2 00 ND <br /> Ethyl tert-butyl ether 2 00 ND " <br /> _Tert-amyl methyl ether 2 00 ND <br /> Surrogate 12-DCA-d4 600-140 107 Yo <br /> MW-7(72') 5003246-07 Water <br /> Tert-butyl alcohol 0030239 3/24/00 3/24/00 200 ND ug/1 <br /> Methyl tert-butyl ether " " " 2 00 ND It <br /> Di-isopropyl ether 2 00 ND " <br /> Ethyl tert-butyl ether 2 00 ND " <br /> Tert-amyl methyl ether_ _ 2 00 ND " <br /> Surrogate 1,2-DCA-d4----- "�- — --- - 600-140 114 - 00/a��� -��-- <br /> MW-10(71') 5003246-08 Water <br /> Tert-butyl alcohol 0030239 3/24/00 3/24/00 200 ND ug/l <br /> Methyl tert-butyl ether 200 ND " <br /> Di-isopropyl ether 200 ND " <br /> Ethyl tert-butyl ether 200 ND " <br /> Tert-amyl methyl ether_ _ _ 200 ND " <br /> Surrogate 1 2-DCA-d4 600-140 — — 112 -- <br /> Sequoia Analytical- Sacramento *Refer to end of report for text of notes and definitions <br /> Page 5 of 9 <br />