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Sequoia 1580 Chesapeake Dnve Redwood City 94063 (CA 415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (5 10) 988 9600 FAX(510)988 9,573 <br /> Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (9t6) 921 9600 FAX(916)921 0100 <br /> Pacific Environmental Group, Inc Client project ID Arco 02133, Stockton, CA Sample Dec 4 <br /> 1996 <br /> 11315 Sunrise Gold Circle, #M Sample Matrix Water Received Dec 5, 1996 <br /> 1 Rancho Cordova, CA 95742 Analysis Method EPA 5030/8020 Modified Reported Dec 17, 1996 <br /> Attention Rusty Benkoslry First Sample# 612-0187 <br /> v n } . ` ry v .4 w` .....n.. • Y vw K. t v } vv S . v w ... }.- " Cv • .- . v .. <br /> METHYL TERTIARY BUTYL ETHER (MTBE) <br /> Sample Sample Sample <br /> Analyte Units Results Results Results <br /> pg/L 612-0187 612-0188 612-0189 <br /> MW-4 MW-5 BHa1 <br /> MTBE ND ND ND <br /> Reporting Lima 50 20* 50* <br /> Quality Control Data <br /> Date Analyzed 12/10/96 12/11/96 12/10/96 <br /> Instrument Identification GCHP-2 GCHP-1 GCHP-2 <br /> Surrogate Recovery, % 96 114 126 <br /> (QC Limits = 60-140%) <br /> Analytes reported as N D were not detected at or above the reporting limit <br /> *Reporting limit rased due to matrix interference <br /> SEQ CIA ANALYTIC L, FLAP #1624 <br /> f cnda C Schnetder <br /> Project Manager/Sacramento Laboratory <br /> 6120181 PES <4> <br />