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IDSequoia 819 Striker Avenue,Suite 8 Sacramento, CA 95834 qwr Analytical (916)921-9600 FAX(91 G)921-0 100 EMCON-Cameron Park Project: ARCO 2186,Stockton,CA Sampled: 6/21/99 3939 Cambridge Rd.Suite 200 Project Number: 21775-237-002 Received: 6/21/99 Cameron Park,CA 95682 Project Manager: Mark Capps Reported: 6/29/99 Volatile Oxygenate Compounds by EPA Method 8260A Sequoia Analytical-Sacramento Batch Date Date Surrogate Reporting Analyte Number Prepared Analyzed Limits Limit Result Units Notes* SP 1 A-D 5906330-01 &W Tert-butyl alcohol 9060309 6/21/99 6/22/99 10.0 ND mg/kg Methyl tert-butyl ether 6/21/99 0.100 0.424 " Di-isopropyl ether 0.100 ND " Ethyl tert-butyl ether 0.100 ND " Tert-amyl methyl ether 0.100 ND " Ethanol 150 ND " Surrogate: 1,1-DCA-d4 60.0-140 85,1 % SPI E-H 5906330-02 SQiI Tert-butyl alcohol 9060309 6/21/99 6/22/99 10.0 ND mg/kg Methyl tert-butyl ether 0.100 0.930 " Di-isopropyl ether 0.100 ND " Ethyl tert-butyl ether 0.100 ND " Tert-amyl methyl ether 0.100 ND " Ethanol 150 ND " Surrogate: 1,1-DCA-d4 60.0-140 86.8 % SP11-L S906330-03 S4i1 Tert-butyl alcohol 9060309 6/21/99 6/22/99 10.0 ND mg/kg Methyl tert-butyl ether 0.100 0.574 " Di-isopropyl ether 0.100 ND " Ethyl tert-butyl ether 0.100 ND " Tert-amyl methyl ether 0.100 ND " Ethanol 150 ND " Surrogate: 1,1-DCA-d4 60.0-140 87.6 % SP1 M-Q S906330-04 Soil Tert-butyl alcohol 9060309 6/21/99 6/22/99 10.0 ND mg/kg Methyl tert-butyl ether 0.100 0.439 " Di-isopropyl ether 0.100 ND " Ethyl tert-butyl ether 0.100 ND " Tert-amyl methyl ether 0.100 ND " Ethanol 150 ND " Surrogate: 1,1-DCA-d4 60.0-140 84.4 % SPI R-T S906330-05 X411 Tert-butyl alcohol 9060309 6/21/99 6/22/99 10.0 ND mg/kg Methyl tert-butyl ether 0.100 1.16 " Di-isopropyl ether 0.100 ND " Ethyl tert-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 3 of 8