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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364-9600 FAX(650)364-9.233 <br /> 404 N.Wiget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 119 Striker Avenue.Suite 8 Sacramento. 95834 (917 922-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd.North,Ste.D Petaluma,CA 9 94954 (707)) 792-1865 FAX(707) 792-034Z <br /> EM ON -..Sac..::. Genf ProjecfTD: Al �0�2186, Stockton,.CA.. .. ... Sampled: Sep 21, X998 <br /> 1433 N. Market Blvd, Sample Descrlpt: Method Blank Received., Sep 21, 1998 <br />.:,Sacramento, CA 95834 Analysis Method: EPA 5030/8260 Analyzed: Oct 6, 1998:::; <br /> Attention Dave Foley Lab Number BLK100698 Reported: Oct 8, 1998::::: <br /> OXYGENATES by GC/MS (EPA 8260) <br /> Analyte Reporting Limit Sample Results <br /> pg/L pg/L <br /> Tertiarybutanol................................................................. 200 N.D. <br /> Methyl tertiary butyl ether(MTBE).................................... 2.0 <br /> ..................................... N.D. <br /> Di-isopropyl ether (DIPS)........................ . . 2.0 ...... N.D. <br /> Ethyl tertiary butyl ether (ETBE)....................................... 2.0 ..................................... N.D. <br /> Tertiary amyl methyl ether(TAME).................................. 2.0 N.D. <br /> Surrogates Control limit% % Recovery <br /> 1,20hioroethane-d4 ................................................... 50-150 ............................................. 94 <br /> Sample was analyzed outside the recommended hold time for this method,due to instrument problems. <br /> analytes reported as N.D.were not detected at or above the reporting limit. <br />;EQUOIA ANALYTICAL, EL7#71 <br /> ZoW. BZ, <br /> 4 . ,,f <br /> n.a <br />'roject Manager/Sacramento Laboratory <br /> S809241.EMC <3> <br />