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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 9673 <br /> �IIII� 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 Sod Received Feb 13, 1998 <br /> Sacramento, CA 95834 Analysis Method EPA 5030/8020 Modified Reported Feb 24, 1998 <br /> Attention Mark Capps First Sample # 802-0354 <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 802-0354 802-0355 802-0356 802-0357 802-0358 802-0359 <br /> PL-16 PL-17 D-1 D 2 0-3 D 4 <br /> (4 FT) (3 1/2 FT) (2 1/2 FT) (2 1/2 FT) (2 1/2 FT) (2 1/2 FT) <br /> MTBE ND ND 058 ND ND ND <br /> Reporting Limit 0 050 0 050 0 050 0 050 0 050 0 050 <br /> Quality Control Data <br /> Date Analyzed 02/17/98 02/18/98 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, % 103 102 100 102 100 101 <br /> (OC Limits = 60-140%) <br /> Analytes reported as N D were not detected at or above the reporting limit <br /> UOIA ANALYTICAL, <br /> ,EELAP #1624 <br /> 7��;�-,/, <br /> ,��- <br /> Ronald W Bobel <br /> Project Manager/Sacramento Laboratory <br /> 8020348 EMC ¢5> <br />