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Sequoia 680 Chesapeake Onve Redwood City CA 94063 (650) 364 9600 FAX(650)364-9233 <br /> a�..`� ) 404 N Weget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> �,,�► Analytical 819 Stnker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> EMCON Client Project ID ARCO 2168, Stockton, GA Sampled Feb 9, 1998 <br /> 1433 N Market Blvd Sample Matrix Water Received Feb 10, 1998 <br /> Sacramento, CA 95834 Analysis Method EPA 5030/8020 Modified Reported Feb 19, 1998 <br /> Attention Dave Foley First Sample # 802-0194 <br /> METHYL TERTIARY BUTYL ETHER (MTBE) <br /> Sample Sample Sample Sample Sample Sample <br /> Analyte Units Results Results Results Results Results Results <br /> erg/L 802-0194 802-0195 802-0196 802-0197 802-0198 802-0199 <br /> MW-1 (54') MW-2(53) MW-3(54) MW-4(59) MW-5 (55) MW-6(43) <br /> MTBE ND ND ND ND ND ND <br /> Reporting Limit 1000* 500* 1000* 500* 25* 1000* <br /> Duality Control Data <br /> Date Analyzed 02/17/98 02/17/98 02/17/98 02/17/98 02/18/98 02/17/98 <br /> nstrument Identification GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Surrogate Recovery, % 91 103 98 101 125 102 <br /> QC Limits = 60-140%) <br /> Reporting Limit raised due to matrix interference <br />'urgeable Hydrocarbons are quantitated against afresh gasoline standard <br /> maiytes reported as N D were not detected at or above the reporting limit <br /> iE OIA ANALYTICAL, P #1624 <br /> . /'�-�'� �-,` <br /> lonald W Bobel <br />'ro)ect Manager/Sacramento Laboratory <br /> 8020194 EMC <3> <br />