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Sequoia <br /> 819 Striker Avenue,Suite 8 <br /> Sacramento,CA 95834 <br /> q„W Analytical (916)921-9600 <br /> FAX(916)92 1-0100 <br /> EMCON -CP <br /> Project: ARCO 2186,Stockton,CA <br /> 3939 Cambridge Ave Project Number: 21775-237-002 Sampled: 6/17/99 <br /> Cameron Park,CA 95682Received: 6/18/99 <br /> Project Manager: Mark Caps Reported: 7/l/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 /> PL-2(4')(continued( <br /> 590631.9-0 <br /> Surrogate: 1,2-DCA-d4 <br /> 60.0-140 84.4 <br /> PL 3 f4) 5906319-06 541.1 <br /> Tert-butyl alcohol 9060309 6/21/99 6/23/99 10.0 ND mg/kg <br /> Methyl tert-butyl ether 0.100 ND <br /> Di-isopropyl ether <br /> Ethyl tert-butyl ether 0.100 ND " <br /> Tert-amyl methyl ether „ 0.100 ND " <br /> 0.100 ND " <br /> Surrogate: 1,2-DCA-d4 <br /> 60.0-140 83.6 <br /> PLA(4) 5906319-07 <br /> Tert-butyl alcohol 9060309 6/21/99 6/23/99 10.0 SDR mg/kg <br /> Methyl tert-butyl ether <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: l,2-DCA-d4 <br /> 60.0-140 82.0 ,% <br /> PL-5 (4') 5906319-OS 5411 <br /> Tert-butyl alcohol 9060309 6/21/99 6/23/99 <br /> Methyl tert-butyl ether „ 10.0 ND mg/kg <br /> Di-isopropyl ether 0.100 0.131 " <br /> Ethyl tert-butyl ether 0.100 ND " <br /> Tert-amyl methyl ether <br /> 0.100 ND " <br /> 0.100 ND " <br /> .Surrogate: 1,2-DCA-d4 60.0-1400 <br /> 82.0 /o <br /> 5906319-09 <br /> Tert-butyl alcohol 9060309 6/21/99 6/23/99 so <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: 1,2-DCA-d4 „ <br /> 60.0-140 82.4 <br /> D 2(5) 5906319-10 6911 <br /> Tert-butyl alcohol 9060309 6/21/99 6/24/99 <br /> 10.0 ND mg/kg <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 8 of 14 <br />