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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> a- 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 /> EMCON Client Project ID ARCO 2168, Stockton, CA 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 # 802-0200 <br /> METHYL TERTIARY BUTYL ETHER (MTBE) <br /> Sample <br /> Analyte Units Results <br /> {-!J/L 802-0200 <br /> MW-7(47) <br /> MTBE 4,400 <br /> Reporting Limit 500* <br />)uality Control Data <br />)ate Analyzed 02/17/98 <br /> nstrument Identification GCHP-2 <br /> surrogate Recovery, % 102 <br /> OC Limits = 60-140%) <br /> Reporting Limit raised due to matrix interference <br /> urgeable Hydrocarbons are quantitated against a fresh gasoline standard <br /> nalytes reported as N D were not detected at or above the reporting limit <br />:077 TICAL, ELAP #1624 <br /> onald W Bobel <br /> rolect Manager/Sacramento Laboratory <br /> 8020194 EMC <4> <br />