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404 N Wlget Lane <br /> 4 Sequoia Walnut Geek CA 94598 <br /> (925)988-9604 <br /> Analytical FAX(925)988-9673 <br /> tiler-Ryan--Dublin h A Client(project ID Unocal #5886, Stockton — Sampled Aug 16-17,41999 <br /> 747 Sierra Court, Suite J Sample Matrix Water Received Aug 18, 1999 <br /> Dublin, CA 94568 Analysis Method EPA 5030/8015 Mod /8020 Reported Sep 14, 1999 <br /> Attention Deanna Harding First Sample # W908373 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX / MTBE <br /> Reporting Sample Sample Sample <br /> Analyte Limit 1 D. I.D I.D. <br /> pg/L W908373-19 908373-20 908373-21 <br /> MW-10S MW-101 1MW-10D <br /> Purgeable <br /> Hydrocarbons 50 N D N D N D <br /> Benzene 050 N D N D N D <br /> Toluene 050 N D N D N D <br /> Ethyl Benzene 050 N D N D N D <br /> • Total Xylenes 050 N D N D N D <br /> MTBE 25 56 57 10 <br /> Chromatogram Pattern - - - <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 1 0 1 0 <br /> Date Analyzed 8/27/99 8/27/99 8/27/99 <br /> Instrument Identification HP-5 HP-5 HP-5 <br /> Surrogate Recovery, % 88 88 90 <br /> (OC 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, #y1271 <br /> Ouliann`eFegley (f <br /> Project Manager <br /> p� W9=173GET <4> <br /> U r' <br />