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Sequoia 819 Striker Avenue,Suite 8 <br /> Sacramento,CA 95834 <br /> Analytical (916) 921-9600 <br /> FAX(916)921-0100 <br /> EMCON -CP <br /> Project: ARCO 2186,Stockton,CA Sampled: 6/17/99 <br /> 3939 Cambridge Ave Project Number: 21775-237-002 <br /> Cameron Park,CA 95682Received: 6/18/99 <br /> Project Manager: Mark Capps Reported: 7/1/99 <br /> Volatile Oxygenate Compounds by EPA Method 8260A <br /> Sequoia Analytical-Sacramento <br /> Batch Date Date Surrogate Reporting <br /> Analyte Number Prepared Analyzed Limits <br /> Limit Result Units Notes* <br /> D-2(5') anti 5906319-10 <br /> Methyl tert-butyl ether 9060309 6/21/99 6/24/99SAWDi-isopropyl ether 0.100 ND mg/kg <br /> Ethyl tert-butyl ether <br /> 0.100 ND " <br /> Tert-amyl methyl ether 0.100 ND " <br /> 0.100 ND " <br /> Surrogate: 1,2-DCA44 " " 60.0-1400 — <br /> 75.6 /o <br /> D-3butyl alcohol 5906319-11 <br /> 9060309 6/21/99 6/24/99so <br /> 10.0 ND mg/kg <br /> Methyl tert-butyl ether �� �� <br /> Di-isopropyl ether 0.100 ND " <br /> Ethyl tert-butyl ether0.100 ND " <br /> Tert-amyl methyl ether 0.100 ND " <br /> 0.100 ND " <br /> Surrogate: 1,2-DCA44 60.0-1400 — <br /> 83.2 /o <br /> D 4(51 5906319-12 S9w <br /> Tert-butyl alcohol 9060309 6/21/99 6/24/99 <br /> Methyl tert-butyl ether 10.0 ND mg/kg <br /> Di-isopropyl ether <br /> 0.100 ND " <br /> Ethyl tert-butyl ether 0.100 ND " <br /> Tert-amyl methyl ether 0.100 ND " <br /> 0.100 ND " <br /> Surrogate: 1,2-DCA44 60.0-14084.0 % <br /> D--5-(5' S206319-13 5411 <br /> Tert-butyl alcohol 9060309 6/21/99 6/24/99 <br /> Methyl tert-butyl ether 10.0 ND mg/kg <br /> Di-isopropyl ether 0.100 ND " <br /> Ethyl tert-butyl ether <br /> 0.100 ND " <br /> Tert-amyl methyl ether 0.100 ND " <br /> 0.100 ND " <br /> Surrogate: /,2-DCA-d4 60.0-14084.0 % <br /> DA <br /> but <br /> Teyl alcohol5906319-14 S" <br /> Methyl tert-butyl ether <br /> 9060309 6/21/99 6/24/99 10.0 ND mg/kg <br /> �� �� „ <br /> Di-isopropyl ether 0.100 0.196 " <br /> Ethyl tert-butyl ether 0.100 ND " <br /> Tert-amyl methyl ether 0.100 ND " <br /> 0.100 ND " <br /> Sequoia Analytical-Sacramento <br /> *Refer to end of report for text of notes and definitions. <br /> Page 9 of 14 <br />