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4 <br /> Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650)364-%00 FAX(650)364-9233 <br /> 404 N.Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd.North,Ste.D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Pinnacle-C.P. Project: ARCO,5469,Stockton CA Sampled: 2/17/99 <br /> 3939 Cambridge Road,Ste. 220 Project Number: N/A Received: 2/17/99 <br /> Cameron Park,CA 95682 Project Manager: Mark Capps Reported: 3/3/99 <br /> Volatile Oxygenate Compounds by EPA Method 8260A <br /> Sequoia Analytical-Sacramento <br /> Batch Date Date Surrogate Reporting <br /> Analyte Number Prepared Analyzed Limits Limit Result Units Notes* <br /> PL-7(5 1 S902236-01 <br /> $9J1 <br /> Tert-butyl alcohol 9020258 2/22/99 2/22/99 10.0 ND mg/kg <br /> Methyl tert-butyl ether 0.100 ND " <br /> Di-isopropyl ether 0.100 ND " <br /> Ethyl tert-butyl ether 0.100 ND " <br /> Tert-amyl methyl ether 0.100 ND " <br /> Surrogate: 1,1-DCA-d4 " " " 60.0-14092.8 % <br /> PL-g(5 1 S902236-02 X011 <br /> Tert-butyl alcohol 9020258 2/22/99 2/22/99 10.0 ND mg/kg <br /> Methyl tert-butyl ether 0.100 11.1 " <br /> Di-isopropyl ether 0.100 ND " <br /> Ethyl tert-butyl ether 0.100 ND " <br /> Tert-amyl methyl ether 0.100 ND " <br /> Surrogate: 1,1-DCA-d4 60.0-140 101 as <br /> P .-8 W(35'1 5902236-03 Soil <br /> Tert-butyl alcohol 9020258 2/22/99 2/22/99 10.0 ND mg/kg <br /> Methyl tert-butyl ether 0.100 ND " <br /> Di-isopropyl ether 0.100 ND " <br /> Ethyl tert-butyl ether 0.100 ND " <br /> Tert-amyl methyl ether 0.100 ND " <br /> Surrogate: 1,1-DCA-d4 60.0-140 96.4 <br /> Sequoia Analytical-Sacramento q A *Refer to end of report for text of notes and definitions. <br /> Ronald W. Bobel,Client Services Representative Page 4 of 9 <br />