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ID Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364-9600 FAX(415)364-9233 <br /> 404N Wiget Lane Walnut Creck CA 94598 (510) 988 9600 FAX(510)988%73 <br /> qW Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> EMCON Client Project ID ARCO 2130, Stockton, CA Sampled Aug <br /> 19 19971433 N Market Blvd Sample Matrix Water Received <br /> Aug 20, 1997 <br /> Sacramento, CA 95834 Analysis Method EPA 5030/8020 Modified Reported Sep 4, 1997 <br /> Attention Claudio Avila First Sample # 708-0787 <br /> METHYL TERTIARY BUTYL ETHER (MTBE) <br /> Sample Sample Sample Sample Sample <br /> Analyte Units Results Results Results Results Results <br /> ug/L 708-0787 708-0788 708-0789 708-0791 708-0794 <br /> MW-1 (73) MW-2 (72) MW-3 (72) MW-5 (75) MW-10 (70) <br /> MTBE ND ND ND ND ND <br /> Reporting Limit 50 50* 50 50 so <br /> Quality Control Data <br /> Date Analyzed 08/27/97 08/27/97 08/27/97 08/27/97 08/27/97 <br /> Instrument Identification GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Surrogate Recovery, % 102 90 96 91 90 <br /> (QC 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 limit raised dile to matrix interference <br /> SEQU IA ANALYTIC , ELAP #1624 <br /> inda C Schneider <br /> Project Manager/Sacramento Laboratory <br /> 7080787 EMC <3> <br />