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Sequoia 819 Striker Avenue,Suite 8 Sacramento,CA 95834 45) (916)921-9600 w„w Analytical FAX(916)921-0100 EMCON-Sac Project: ARCO 2186,Stockton,CA Sampled: 6/21/99 1433 N.Market Blvd. Project Number: 21775-237-002 Received: 6/21/99 Sacramento,CA 95834 Project Manager: Mark Capps Reported: 6/22/99 Volatile Oxygenate Compounds by EPA Method 8260A Sequoia Analytical-Sacramento Batch Date Date Surrogate Reporting Analyte Number Prepared Analyzed Limits Limit Result Units Notes* SPIA-D 5906330-01 SAW Tert-butyl alcohol 9060309 6/21/99 6/22/99 10.0 ND mg/kg Methyl tert-butyl ether 1. " 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 " Surrogate: 1,2-DCA-d4 60.0-140 85.2 % SPIE-H 5906330-02 &H 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 " Surrogate: 1,2-DCA-d4 60.0-140 86.8 % SP1I-L 5906330-03 mil 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 Surrogate: 1,2-DCA-d4 60.0-140 87.6 % SP1 M-O S906330-04 SA Tert-butyl alcohol 9060309 6/21/99 6/22/99 10.0 ND mg/kg Methyl tert-butyl ether 110.100 0.439 " 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 84.4 00 SPI R-T 5906330-05 Soil Tert-butyl alcohol 9060309 6/21/99 6/22/99 10.0 ND mg/kg Methyl tert-butyl ether " " 1. 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 2 of 5