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/ \ Sequoia - 680 Chesapeake Drive Redwood Cary 00 CA 94063 (415) 364 96FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(5 10)988 %73 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 96W FAX(916)921 0100 <br /> Brown & Caldwell Client Project lD Arco 05450, Stockton, CA Sampled Mar 19, 1997 <br /> 9616 Micron Ave, Suite 600 Sample Matrix Water Received Mar 20, 1997 <br /> Sacramento, CA 95827 Analysis Method EPA 503 8020 Modified Reported Apr 1, 1997 <br /> Attention Steve Misner First Sample# 703-0652 <br /> METHYL TERTIARY BUTYL ETHE (MTBE) <br /> Sample <br /> Analyte (:Units Results <br /> pmv 703-0652 <br /> j/;X MW-1 <br /> MTBE 19 <br /> Reporting Limit 50 <br /> Quality Control Data <br /> Date Analyzed 03/24/97 <br /> Instrument Identification GCHP-2 <br /> Surrogate Recovery, % 92 <br /> PC Limits = 60-140%) <br /> Purgeable Hydrocarbons are quantitated against a fresh gasoline standard <br /> Analytes reported as N 0 were not detected at or above the reporting limit <br /> SEQUOIA ANALYTICAL, ELAP #1624 <br /> ea"A M FgUCtA4v <br /> Edana M Fruciano <br /> Project Manager/Sacramento Laboratory 7030652 BRS <2> <br />