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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 0 FAX (510) 686-9689 <br />� <br /> prealian Engineering, Inc Client Project ID Unocal#6981,4707 Pacific Ave ,Stockton Sampled Oct 20, 1993 <br /> 01 Stanwell Dr, Ste 400 Sample Matrix Water Received Oct 22, 1993 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015/8020 Reported Nov 5, 1993 <br /> Attention Avo Avedesslan First Sample# 310-1251 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample <br /> Analyte Limit ID ID <br /> Mg/L. 310-1251 Matrix <br /> MW-13 Blank <br /> Purgeable <br /> Hydrocarbons 50 N D <br /> Benzene 0 5 N D <br /> Toluene 0 5 N D <br /> Ethyl Benzene 0 5 N D <br /> 0Total Xylenes 0 5 N D <br /> Chromatogram Pattern <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 1 0 <br /> Date Analyzed 10/27/93 10/27/93 <br /> Instrument Identification HP-5 HP-5 <br /> Surrogate Recovery, % 80 116 <br /> (QC Limits = 70-130°/x) <br /> Purgeable Hydrocarbons are quantitated against a fresh gasoline standard <br /> Analytes reported as N 0 were not detected above the stated reporting limit <br /> SEQUOIA ANALYTICAL <br /> 5 <br /> Alw1 emp <br /> Project Manager`J <br /> 3101239 KEI <3> <br />