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�i <br /> Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 4673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> EMCON Client Project ID Arco 548, Stockton, CA Sampled Feb 13, 1998 <br /> 1433 N Market Blvd Sample Matrix Soil Received Feb 13, 1998 <br /> Sacramento, CA 95834 Analysis Method EPA 5030/8020 Modified Reported Feb 24, 1998 <br /> Attention Mark Capps First Sample # 802-0348 <br /> METHYL TERTIARY BUTYL ETHER (MTBE) <br /> Sample Sample Sample Sample Sample Sample <br /> Analyte Units Results Results Results Results Results Results <br /> mg/kg 802-0348 802-0349 802-0350 802-0351 802-0352 802-0353 <br /> PL 10 PL-11 PL-12 PL-13 PL-14 PL-15 <br /> (3 1/2 FT) (4 FT) (4 FT) (4 FT) (4 FT) (3 1/2 F7) <br /> MTBE ND ND ND 051 ND ND <br /> Reporting Limit 0 10* 0 050 0 050 0 050 0 050 0 050 <br /> Quality Control Data <br /> Date Analyzed 02/17/98 02/17/98 02/17/98 02/17/98 02/17/98 02/17/98 <br /> Instrument Identification GCHP-1 GCHP-1 GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Surrogate Recovery, % 101 92 92 92 92 89 <br /> (QC Limits = 60-140%) <br /> *Reporting limit raised due to matrix interference <br /> Analytes reported as N D were not detected at or above the reporting limit <br /> toUOIA ANALYTICAL, ELAP #1624 <br /> � Zli-If L4 <br /> 11 <br /> Ronald W Bobel <br /> Project Manager/Sacramento Laboratory <br /> 8020346 EMC :4 <br />