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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(630)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988-9673 <br /> e n aly- Cal 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> WCON Client Project Ib ARCO 2130, Stockton, CA Sampled 'Nov 20, 1997 <br /> 1433 N Market Blvd Sample Matrix Water Received Nov 21, 1997 <br /> Sacramento, CA 95834 Analysis Method EPA 5030/8020 Modified Reported Dec 10, 1997 <br /> Attention Deanna Santos First Sample # 711-1285 <br /> METHYL TERTIARY BUTYL ETHER (MTBE) <br /> Sample Sample Sample <br /> Analyte Units Results Results Results <br /> pg/L 711-1285 711-1286 711-1292 <br /> MW-1 (48) MW-2(48) MW-10 (48) <br /> MTBE N D N D N D <br /> Reportirg Limit 50 50 50 <br /> Quality Control Data <br /> Date Analyzed 12/02/97 12/02/97 12/02/97 <br /> Instrument Identification GCHP-2 GCHP-2 GCHP-2 <br /> Surrogate Recovery, % 87 112 92 <br /> (QC Limits = 60-140%) <br /> Purgeable Hydrocarbons are quantitated against a fresh gasoline standard <br /> Analytes reported as N D were rat detected at or above the reporting limit <br /> SEQ [A ANALYTIC � ELAP #1624 <br /> inda C Schneider <br /> Project Manager/Sacramento Laboratory <br /> 7111285 EMC a3> <br /> is <br />