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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 • FAX (415) 364-9233 <br /> M P D S Services, Inc Client Project ID Unocal, 6981 Stockton Sampled Feb 28, 1994 <br /> 2401 Stanwell Drive, Suite 400 Sample Matrix Water Received Feb 28, 1994 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015 Mod /8020 Reported Mar 1, 1994 <br /> Attention Avo Avedessian First Sample# 4BG3007 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample <br /> Analyte Limit I D <br /> yg/L 4BG3007 <br /> MW-14 <br /> Purgeable <br /> Hydrocarbons 50 N D <br /> Benzene 050 N D <br /> Toluene 0 50 N D <br /> Ethyl Benzene 0 50 N D <br /> Total Xylenes 050 N D <br /> Chromatogram Pattern - <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 <br /> Date Analyzed 3/1/94 <br /> Instrument Identification GCHP-2 <br /> Surrogate Recovery, % 90 <br /> (QC Limits = 70-130%) <br /> Purgeable Hydrocarbons are quantitated against a fresh gasoline standard <br /> Analytes reported as N D were not detected above the stated reporting limit <br /> •SEQUOIA ANALYTICAL <br /> 1 <br /> Suzanne Chin <br /> Project Manager 4BG3001 MMM <2> <br />