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/ <br /> Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 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 /> Analytical 1455 McDowell Blvd. North,Ste. D Petaluma,CA 94954 (70 7)792-1865 FAX(707) 792-0342 <br /> 1551 Industrial Road San Carlos,CA 94070-41 1 1 (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-1(4 ) S202174-01 <br /> X4.11 <br /> Tert-butyl alcohol 9020206 2/17/99 2/17/99 10.0 ND mg/kg <br /> Methyl tert-butyl ether 0.100 0.731 " <br /> Di-isopropyl ether 0.100 ND " <br /> Ethyl tert-butyl ether 0.100 ND " <br /> Tert-amyl methyl ether 0.10 ND " <br /> Surrogate: 1,1-DCA-d4 60.0-140 91.4 <br /> FL-2(3.5') Ta5t, � <br /> S902174-02 ' 5411 <br /> Tert-butyl alcohol 9020206 2/17/99 2/17/99 10.0 ND mg/kg ✓ �,�G <br /> Methyl tert-butyl ether 0.100 2.64 " <br /> Di-isopropyl ether 0.100 ND " <br /> Ethyl cert-butyl ether 0.100 ND " <br /> Tert-amyl methyl ether 0.100 ND " <br /> Surrogate.• 1,2-DCA-d4 60.0-140 98.8 % <br /> U-3( .5') S902174-03 <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 60.0-140 101 % <br /> FLA(3.3') S902174-04 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. 1,1-DCA-d4 60.0-140 93.2 % <br /> PL-5(4 1 5202174-05 ,Soil <br /> Tert-butyl alcohol 9020206 2/17/99 2/17/99 10.0 ND mg/kg <br /> Methyl tert-butyl ether 0.100 0.186 " <br /> Di-isopropyl ether 0.100 ND " <br /> Ethyl tert-butyl ether 0.100 ND " <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> dJc� " l• <br /> Ronald W. Bobel,Client Services Represen tive <br /> Page 7 of 15 <br />