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Sequoia 6$0 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650)364-9Z33 <br /> 404 N. Wiget Lane Walnut Creek,CA 94598 (925)988-9600 <br /> 819 Striker Avenue,Suite 8 FAX(925)988-9673 <br /> Analytical FAX CA 95834 (906)921-9600 FAX(916)991-0100 <br /> 1455 McDowell Blvd.North,Ste. D Petaluma,CA 94954 <br /> 1551 Industrial Road (707)792-1865 FAX(707)792.0342 <br /> San Carlos.CA 94070-41 1 I (650)932-9600 FAX(650)932-9612 <br /> [3939 <br /> nacle-C.P. Project: ARCO,5469,Stockton CA <br /> Cambrid e Road,Ste.220 Sampled: 2/11/99 <br /> g Project Number: N/AReceived: 2/12/99 <br /> meron Park,CA 95682 Project Manager: Mark Capps <br /> Reported: 3/l/99 <br /> Volatile Organic 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-10(4.3') S202174-10 <br /> Te talcohol 9020206 2/17/99 2/17/99 10.0 44.0 mg/kg <br /> SA <br /> Methylthyl tort-butyl ether 0.100 " <br /> Di-isopropyl ether 6 <br /> 0.100 N 5.1 6 " <br /> Ethyl tert-butyl ether 0.100 ND " <br /> Tert-amyl methyl ether <br /> 0.100 ND <br /> " <br /> Surrogate: 1,2-DCA-d4 " 60.0-140 % <br /> PL-11(4 1 S902174-11 X41.1 <br /> Tert-butyl alcohol 9020206 2/17/99 2/17/99 10.0 ND mg/kg <br /> Methyl tert-butyl ether 0.100 0.482 " <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: 1,2-DCA-d4 60.0-140 101 <br /> FO <br /> U-12(4 1 S902174-12 5411 <br /> Tert-butyl alcohol 9020206 2/17/99 2/17/99 10.0 ND mg/kg <br /> Methyl cert-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: 1,2-DCA-d4 60.0-140 102 <br /> RL-13(4 1 S902174-13 SA <br /> Tert-butyl alcohol 9020206 2/17/99 2/17/99 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: 1,2-DCA-d4 60.0-140 103 <br /> PL-14(4.5') S902174-14 5411 <br /> Tert-butyl alcohol 9020206 2/17/99 2/17/99 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 /> Sequoia Analytical -Sacramento *Refer to end of report for test of notes and definitions. <br /> :onald W. Bobel,Client Services Representative <br /> �, Page 9 of 15 <br />