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SEQUOIA ANALYTICAL <br /> 1900 <br /> Bates Avenue Suite LM Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> MPDS Services, Inc Client Project 1D Unocal#6981,4707 Pacific Ave Stockton Sampled Jan 17, 1994 <br /> 2401 Stanwell Or, Ste 400 Sample Matrix Water Received Jan 19, 1994 <br /> Concord, CA 94520 Analysts Method EPA 5030/8015/8020 Reported Jan 31, 1994 <br /> Attention Avo Avedissian First Sample# 401-0952 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample <br /> Analyte Limit I D I D <br /> yg/L 401-0952 Method <br /> MW-13 Blank <br /> Purgeable <br /> Hydrocarbons 50 180 <br /> Benzene 05 23 <br /> Toluene 0 5 2 0 <br /> Ethyl Benzene 05 90 <br /> Total Xylenes 05 39 <br /> Chromatogram Pattern Gasoline <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 1 0 <br /> Date Analyzed 1/26/94 1/26/94 <br /> Instrument Identification HP-2 HP-2 <br /> Surrogate Recovery, % 105 110 <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 <br /> r� <br /> Alan emp <br /> Project Manag r <br /> 4010940 MPD <3> <br />