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j SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue Suite LM • Concord, California 94520 <br /> Nap (510) 686-9600 9 FAX (510) 686-9689 <br /> prealian Engineering, Inc talent Project ID Unocal#5421,7303 Pacific Ave,Stockton Sampled 11/9&11/10/92 <br /> 401 Stanwell Drive, Suite 400 Sample Matrix Water Received Nov 11, 1992 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015/8020 Reported Nov 24, 1992 <br /> Attention Mardo Kapreallan, P E First Sample # 211-0456 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample Sample Sample Sample <br /> Analyte Limit I D 11.11) 1 D I D I D <br /> pg/L 211-0456 211-0457 211-0458 211-0459 Matrix <br /> EB 1 EB 2 EB 3 EB 4 Blank <br /> Purgeable <br /> Hydrocarbons 50 260 N D N D N D <br /> Benzene 05 87 0 88 N D 3 4 <br /> Toluene 0 5 26 N D N D N D <br /> Ethyl Benzene 0 5 89 N D N D 0 78 <br /> Total Xylenes 05 40 N D N D 078 <br /> Chromatogram Pattern Gasoline -- - Discrete <br /> Peaks <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 1 0 1 0 1 0 1 0 <br /> Date Analyzed 11/13/92 11/13/92 11/13/92 11/13/92 11/13/92 <br /> Instrument Identification HP-2 HP-2 HP-2 HP-2 HP-2 <br /> Surrogate Recovery, % 104 102 102 101 100 <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 /> EQUOIA ANALYTICAL <br /> colt Aieffo <br /> Project Manager 2110456 KEI <1> <br />