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60—peake Drive Redwood City CA 940 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wlget Lane Walnut Creek CA 94598 (925)9a8-9600 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 (707)792-1865 FAX(707)792-0342 <br /> Isan <br /> ne Technical Services,Inc Project Shell Oil Co Sampled 1211198 <br /> 0 Rogers Ave Project Number 341 East Main St,Ripon Received 1214198 <br /> Jose,CA 95112 Project Manager Fran Thie Reported 12/29/98 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 801SW8020MIQuahty Control <br /> Sequoia Analytical-Petaluma ,-- ' <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> Analyte Analyzed Level Result Result Units Rccov Limits % Lnrut % Notes* <br /> Batch 8120240 Date Prepared 12/10/98 Extraction Method EPA 5030 waters <br /> Blank 8120240-BLK1 <br /> Gasoline 12/10/98 ND ug/1 500 <br /> Benzene ND 0 500 <br /> Toluene ND 0 500 <br /> Ethylbenzene ND 0 500 <br /> Xylenes(total) ND 0 500 <br /> Methyl tert-butyl ether ND 200 <br /> Surrogate a a a-Trifluorotoluene 300 _ 242 it 650-135 807 <br /> Surrogate 4-Bromofluorobenzene 300 260 it 650-135 867 <br /> LCS 8120240-BS1 <br /> Benzene 12/10/98 100 889 ug/l 650-135 88 9 <br /> Toluene 100 875 650-135 875 <br /> Ethylbenzene 100 870 650-135 870 <br /> Xylenes(total) 300 264 to 650-135 880 <br />,gftthyl tert-butyl ether 100 98 6 650-135 98 6 <br /> rogate aa a-Trifluorotoluene to 300 252 IF6.50-135 840 <br /> Matrix Spike 8120240-MSI P812047-01 <br /> Benzene 12/10/98 100 ND 883 ug/1 65 0-135 883 <br /> Toluene 100 ND 863 650-135 863 <br /> Ethylbenzene 100 ND 84 4 650-135 844 <br /> Xylenes(total) 300 ND 256 65 0-135 853 <br /> Methyl tert-butyl ether 100 ND 91 1 650-135 911 <br /> Surrogate a,a,a-Trifluorotoluene 300 244 65 0-135 813 <br /> Matrix Spike Dup 8120240-MSD1 P812047-01 <br /> Benzene 12/10/98 100 ND 914 ug/1 650-135 914 200 345 <br /> Toluene 100 ND 896 " 650-135 896 200 375 <br /> Ethylbenzene 100 ND 877 It 650-135 877 200 383 <br /> Xylenes(total) 300 ND 266 It <br /> 650-135 887 200 391 <br /> Methyl tert-butyl ether 100 ND 91 6 IF 650-135 916 200 0 547 <br /> Surrogate a,a a-Trifluorotoluene 300 241 11650-135 803 <br />�uoia Analytical-Petaluma *Refer to end of report for text of notes and definitions <br /> Page 4 of 6 <br />