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Sequoia~ 680 Chcsapeakc Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Stinker Avenue Suites Sacramento CA 95834 (916) 921 9600 FAX(916)911 0100 <br /> Pacific Environmental Group, Inc Client Project 1D Arco 2093, Tracy, CA Sampled Jul 18, 1996 <br /> 11315 Sunrise Gold Circle, #M Sample Matrix Water Received Jul 19, 1996 <br /> Rancho Cordova, CA 95742 Analysis Method EPA 5030/8020 Modified Reported Jul 30, 1996 <br /> Attention Greg Barclay First Sample # 607-0844 <br /> Methyl Tertiary Butyl Ether (MTBE) <br /> Reporting Sample Sample Sample Sample Sample Sample <br /> Analyte Limit I D. I D I D I D I D I D <br /> Mg/L 607-0844 607-0845 607-0846 607-0847 607-0848 607-0849 <br /> ATR-7 ATR-8 ATR 9 ATR-10 ATR-11 ATR-12 <br /> MTBE 50 28 ND ND ND ND ND <br /> Quality Control Data <br /> Report Limit Multiplication Factor 10 100* 10 1 0 10 10 <br /> Date Analyzed 07/24/96 07/24/96 07/24/96 07/24/96 07/24/96 07/24/96 <br /> Instrument identification GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Surrogate Recovery 81 90 80 77 85 86 <br /> (QC Limits = 70-130%) <br /> Analytes reported as N D were not detected at or above the reporting limit <br /> 'Reporting limit raised due to matrix interference <br /> SEQUOIA ANALYTICAL, ELAP #1624 <br /> 7rolecindaC Schneider <br /> t Manager/Sacramento Laboratory <br /> 6070838 PES <5> <br />