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I • y y 819 Striker Avenue, Suite 8 �r. S e q u o i a Sacramento. CA 95834 (916)921-9600 Analytical FAX(916)921-0 100 EMCON-Sac Project: ARCO'2186,Stockton,CA Sampled: 6/21/99 1433 N.Market Blvd. Project Number: 21775-237-002 Received: 6121/99 Sacramento,CA 95834 Project Manager: Mark Caps 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* SPI A-D 5906330-01 SQiI Tert-butyl alcohol 9060309 6121/99 6122/99 10.0 ND r►ig/kg Methyl Cert-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 " Surrogate: 1,2-DCA-d4 60.0-140 851 % SP1 E-11 S906330-02 54.11 Tert-butyl alcohol 9060309 6/21/99 6122/99 10.0 ND mg/kg Methyl ter -butyl ether 0A00 00 0.930 " Di-isopropyl ether 0.100 ND " Ethyl tert-butyl ether 0.100 ND Tert-amyl methyl ether 0.100 ND " Surrogate: 1,1-DC444 60.0-140 86.8 % SP1L-L S906330-03 SAW 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 % SP1M-0 S906330-04 Sail Tert-butyl alcohol 9060309 6121/99 6/22199 10.0 ND mg/kg Methyl tert-butyl ether " 0.100 0.439 " Di-isopropyl ether 0.100 ND " Ethyl tent-butyl ether 0.100 ND " Teri-amyl methyl ether 0.100 ND " Surrogate: 1,2-DCA-d4 60.0-140 84.4 % SPI R-T S906330-05-05 SQiI 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 tent-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