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f� SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> MPDS Services, Inc Client Project ID Unocal#2859, 1665 Pacific Ave,Stockton Sampled Feb 18, 1994 <br /> 2401 Stanwell Dr, Ste 400 Sample Matrix Water Received Feb 18, 1994 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015/8020 Reported Mar 8, 1994 <br /> Attention Avo Avedissian First Sample # 402-1433 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample <br /> Analyte Limit I D I D <br /> erg/L 402-1433 Matrix <br /> MW7 Blank <br /> Purgeabl e <br /> Hydrocarbons 50 N D <br /> Benzene 05 N D <br /> Toluene 0 5 N D <br /> Ethyl Benzene 05 N D <br /> Total Xylenes 05 N D <br /> Chromatogram Pattern -- <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 10 <br /> Date Analyzed 3/3/94 3/3/94 <br /> Instrument Identification HP-4 HP-4 <br /> Surrogate Recovery, % 103 109 <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 /> K p <br /> Project Manager <br /> 4021427 MPD <2> <br />