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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> 40prealian Engineering, Inc Client Project ID Unocal, 2835 Navy Or, Stockton Sampled May 28, 1993 <br /> 01 Stanwell Dr, Ste 400 Sample Matrix Water Received May 29, 1993 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015/8020 Reported Jun 8, 1993 <br /> Attention Mardo Kaprealian, P E First Sample # 305-1497 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample <br /> Analyte Limit I D I D <br /> jtg/L 305-1497 Matrix <br /> MW- 7 Blank <br /> Purgeable <br /> Hydrocarbons 50 N D <br /> Benzene 0 5 N D <br /> Toluene 05 N D <br /> Ethyl Benzene 05 N D <br /> Wotal Xylenes 05 N D <br /> Chromatogram Pattern <br /> Quality Control Data <br /> Report Limit Multiplication Factor 10 1 0 <br /> Date Analyzed 6/4/93 6/4/93 <br /> Instrument Identification HP-4 HP-4 <br /> Surrogate Recovery, % 95 96 <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 /> SEQUO ANALYTICAL <br /> • <br /> Scott Aie o 251 <br /> Project Manager <br /> 3051491 KEI <2> <br />