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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988-%00 FAX(510)988%73 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921-9600 FAX(916)921 0100 <br /> 110155MCCN Client Project Ib ARCO 2168, Stockton, CA Sampled Aug 21, 1997 <br /> 1433 N Market Blvd Sample Matrix Water Received Aug 22, 1997 <br /> Sacramento, CA 95834 Analysis Method EPA 5030/8020 Modified Reported Sep 8, 1997 <br /> Attention Claudio Avila First Sample# 708-0907 <br /> METHYL TERTIARY BUTYL ETHER (MTBE) <br /> Sample Sample Sample Sample Sample Sample <br /> Analyte Units Results Results Results Results Results Results <br /> Mg/L 708-0907 708-0908 708-0909 708-0910 708-0911 708-0912 <br /> MINA (54) MW-2(54) MW-3(53) MW-4(58) MW-5(54) MW-6(45) <br /> MTBE ND ND ND ND ND ND <br /> Reporting Limit 2,(00* 500* 2 000* 1,000* 1000* 1 coo* <br /> • <br /> Quality Control Data <br /> Date Analyzed 08/28/97 08/24/97 08/28/97 08/28/97 08/28/97 08/28/97 <br /> Instrument Identification GCHP-7 GCHP-2 GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Surrogate Recovery, % 93 88 99 89 91 97 <br /> (OC Limits = 60-140%) <br /> Purgeable Hydrocarbons are quantitated against a fresh gasoline standard <br /> Analytes reported as N D were not detected at or above the reporting limit <br /> *Reporting limits raised due to matrix interference <br /> SEQUOIA ANALYFLAP #16224 <br /> r <br /> /27 <br /> n <br /> �Zinfa&CSchneider <br /> V <br /> Project Manager/Sacramento Laboratory <br /> 7080907 EMC <3> <br />