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Sequoia 680 Chesapeake Drive Redwood Ciry,CA 94063 (650) 364.%% FAX(650)364-9233 <br /> 404 N.Wiget Lane Walnut Creek,CA 94598 (510) 988.9600 FAX(510)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921.0100 <br /> � - <br /> EMCON Client Project ID. Arco 2186, Stockton, CA' Sampled: Pei 17, 1998 <br /> 1433 N. Market Blvd. Sample Matrix: Water Received: Feb 18, 1998 <br /> s Sacramento, CA 95834 Analysis Method: EPA 5030/8020 Modified Reported: Mar 4, 1998:;;: <br /> Attention:ention: Dave Foley First Sample #: 802-0465 <br /> METHYL TERTIARY BUTYL ETHER (MTBE) <br /> Sample Sample Sample Sample Sample <br /> Analyte Units Results Results Results Results Results <br /> pg/L 802-0465 802-0466 802-0467 802-0468 802-0469 <br /> MW-1 (75.4) MW-2(75.2) MW-3(74.7) VW-3(61.2) MW-4(62.8) <br /> MTBE N.D. N.D. N.D. N.D. 29 <br /> Reporting Limit: 100' 5.0 5.0 5.0 5.0 <br /> • <br /> Quality Control Data <br /> Date Analyzed: <br /> 02/23/98 02/23/98 02/23/98 02/23/98 02/23/98 <br /> Instrument Identification: <br /> GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Surrogate Recovery, %: <br /> (()C Limits = 60-140%) 92 99 89 94 90 <br /> 'Reporting limit raised due to matrix interference. <br /> Analytes reported as N.D.were not detected at or above the reporting limit. <br /> This page amended March 25, 1998. <br /> . SEQUOIA ANALYTICAL, ELAP #1624 <br /> Ronald W. Bobel <br /> Project Manager/Sacramento Laboratory <br /> 8020465.E11r1C [2i <br />