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4 680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 <br /> Sequoia o 1 a FAX(650)364-9233 <br /> 404 N.Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988.9673 <br /> 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 /> Analytical <br /> 1551 Industrial Road San Carlos,CA 94070-41 I I (650)232-9600 FAX(650) 232-9612 <br /> Pinnacle-C.P. Project: ARCO, 5469, Stockton CA Sampled: 2/11/99 <br /> 3939 Cambridge Road, Ste. 220 Project Number: N/A Received: 2/12/99 <br /> Cameron Park,CA 95682 Project Manager: Mark Capps Reported: 3/1/99 <br /> Volatile Organic Compounds by EPA Method 8260A <br /> Sequoia Analytical-Sacramento <br /> Batch Date Date Surrogate Reporting <br /> Analyte Number Prepared Analyzed Limits Limit Result Units Notes* <br /> PL-5(4')(continued) S902174-05 soTert-amyl methyl ether 9020206 2/17/99 2/17/99 0.100 ND mg/kg <br /> Surrogate: 1,2-DCA-d4 60.0-140 94.8 % <br /> PL-6(4,) <br /> S902174-06 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 /> Surrogate: 1,2-DCA-d4 60.0-140 /00 % <br /> PL-7(4.3') S902174-07 sii <br /> Tert-butyl alcohol 9020206 2/17/99 2/17/99 10.0 ND mg/kg <br /> Methyl tert-butyl ether 0.100 4.31 " <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 94.4 % <br /> PL-8(4') S902174-08 spji <br /> Tert-butyl alcohol 9020206 2/17/99 2/17/99 10.0 ND mg/kg <br /> Methyl tert-butyl ether 0.100 4.33 <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 60.0-140 104 % <br /> PL-9 f4,) <br /> 5902174-09 5.411 <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 97.6 % <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> )—n- <br /> Ronald W. Bobel,Client Services Representative Page 8 of 15 <br />