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684 Chesapeake Drive Redwood City.CA 94063 (650)364-9600 FAX(650) 364-9233 <br /> Sequoia 404 N. Wiget Lane WMnut Creek,CA 94598 (925)9$&9600 FAX(925)%8-9673 <br /> 819 Striker Avenue,Suite 8 Sacramento, CA 95834 (9 t6)921-9600 FAX f916)921-0100 <br /> Anatical 1455 McDowell Blvd, Nosth,Ste. D Petaluma, CA 94954 (707) 792-1865 FAX(707) 797-0342 <br /> j�l 1551 Industrial (load San Carlos. CA 94070-41 1 1 (6501 232.9600 FAX(650)732-9612 <br /> EMCON-Sac Project: ARCO 2186,Stockton, CA Sampled: 3/31199 <br /> 1433 N. Market Blvd. Project Number: 21775-237-004 Received: 411199 <br /> Sacramento, CA 95834 Project Manager: Dave Foley Reported: 4/15!99 <br /> Volatile Oxygenate Compounds by EPA Method 8260A/Quality Control <br /> Sequoia Analytical- Sacramento <br /> Date Spike Sample QC Reporting Limit Recov, RPD RPD <br /> Analyte Analyzed Level Result Result Units Rccov. Limits % Limit % Nates* <br /> EXD'a�tion Method: EPA 5030B 1P111 <br /> Blank 90401Q3LKi <br /> Tcrt-butyl alcohol 4/8/99 ND ug/1 200 <br /> Methyl test-butyl ether ND 2,60 <br /> Di-isopropyl ether ND 2.00 <br /> Ethyl tert-bury]ether ND 2.00 <br /> Tert-amyl methyl ether ND 2.04 <br /> Ethanol ND 3000 <br /> Surrogate: 1,2-DC.4-d4 50.0 57.6 60.0-140 115 <br /> LSA 9040103-BS1 <br /> Methyl ten-butyl ether 418/99 50.0 56.4 ug/1 70.0-130 113 <br /> Surrogate: 1,2-DC.444 50.0 57.4 60.0440 115 <br /> 9040103-MSS S94402$-Oi <br /> Me ert-butyl ether 4/8/99 50.0 3.92 58.0 ug/1 60.0-140 108 <br /> Surrogate: 1,2-DCA-d4 " 50.0 57.0 60,0-140 114 <br /> Matrix Spike Dun 9040103-MSD1 5904028-01 <br /> Methyl tert-butyl ether 418199 50.0 3.92 57.4 ug/) 60.0-140 107 25.0 0.930 <br /> Surrogate: 1,2-DCA-d4 50.0 58.6 60.0-140 117 <br /> s <br /> uoia Analytical -Sacramento *Refer to end of report for text of notes and definitions. <br /> aid W. Bobe1,Client Services Representative Page 7 of 9 <br />