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Sequoia 680 Chesapeake 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 %73 <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Pacific Environmental Group, Inc talent Project ID Arco 02i 33, Siackton, CA Sampled `Dec'4, 1996 <br /> 11315 Sunrise Gold Circle, #M Sample Matrix Water Received Dec 5, 1996 <br /> Rancho Cordova, CA 95742 Analysis Method EPA 5030/8020, DHS Luft Reported Dec 17, 1996 <br /> Attention Rusty Benkosky First Sample# 612-0187 TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Sample Sample Sample Sample <br /> Analyte Units Results Results Resutts Results <br /> yg/L 612-0187 612-0188 612-0189 612-0190 <br /> MW-4 MW 5 8HD-1 T&1 <br /> Purgeable N D 4,200 4,500 N D <br /> Hydrocarbons Reporting Limit 50 200 500 so <br /> Benzene N D 88 83 N D <br /> Reporting Limit 050 20 50 050 <br /> Toluene N D N D 11 N D <br /> Reporting Limit 050 20 50 050 <br /> Ethyl Benzene N D 15 350 N D <br /> . Reporting Limit 050 20 so 050 <br /> Total Xylenes N D 44 220 N D <br /> Reporting Limit 050 20 so 050 <br /> Chromatogram - Weathered Weathered <br /> Pattern Gasoline Gasoline <br /> C,6-1012 C6-C 12 <br /> Quality Control Data <br /> Date Analyzed 12/10/96 12/11/96 12/10/96 12/10/96 <br /> Instrument Identification GCHP-2 GCHP-1 GCHP-2 GCHP-2 <br /> Surrogate Recovery, % 96 114 126 104 <br /> (QC Limits = 60-140%) <br /> Purgeable Hydrocarbons are quantitated against a fresh gasoline standard <br /> Analytes reported as N D were not detected at or above the reporting lima <br /> SEQUOIA ANALYTICAL, FLAP #1624 <br /> f / �7 <br /> ind'aC Schnel er <br /> Project Manager/Sacramento Laboratory <br /> 6120181 PEs <2> <br /> 4.0 <br />