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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364-9600 FAX(415)364-9333 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988-9600 FAX(510)988-9673 <br /> !T- Anaiytiea1 819 Sinker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)911-0100 <br /> 915MCON Client Project ID ARCO 2168, Stockton, CA Sampled Aug 21 1997 <br /> 1433 N Market Blvd Sample Matra 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# 708-0913 <br /> METHYL TERTIARY BUTYL ETHER (MTBE) <br /> Sample <br /> Analyte Units Results <br /> Mg/L 708-0913 <br /> MW-7(47) <br /> MTBE N D <br /> Reporting omit 500* <br /> • <br /> Quality Control Data <br /> Date Analyzed 08/28/97 <br /> Instrument Identification GCHP-7 <br /> Surrogate Recovery, % 95 <br /> (QC Limits = 60-140%) <br /> Purgeable Hydrocarbons are quantitated against a fresh gasoline standard <br /> Analytes reported as N 0 were not detected at or above the reporting limit <br /> *Reporting limits raised due to maty- nterference <br /> SEQU 1A ANALY-7TIC/AA. ELAP #1624 <br /> /A///44 <br /> C Schnetder <br /> Vl-,nda <br /> Project Manager/Sacramento Laboratory <br /> 7080907 EMC {4> <br /> t� <br />