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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> via—or (510) 686-9600 • FAX (510) 686-9689 <br /> Waprealian Engineering, Inc Client Project ID Unocal,5606 Pacific Ave,Stockton Sampled Dec 30, 1992 <br /> 2401 Stanwell Drive, Suite 400 Sample Matrix Water Received Dec 30, 1992 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015/8020 Reported Jan 12, 1993 <br /> Attention Mardo Kaprealian, P E First Sample # 212-1175 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample Sample Sample Sample <br /> Analyte Limit I.D. 11.11) 1.11) ID I D. <br /> pg/L 212-1175 212-1176 212-1177 212-1178 Matrix <br /> MW 10 MW 11 MW 12 MW 13 Blank <br /> Purgeable <br /> Hydrocarbons 50 820 84,000 23,000 N D <br /> Benzene 05 25 20,000 3,200 N D <br /> Toluene 05 15 27,000 1,200 N D <br /> Ethyl Benzene 05 53 2,400 560 N D <br /> Total Xylenes 05 3 6 14,000 1,800 N D <br /> Chromatogram Pattern Gasoline Gasoline Gasoline - <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 200 50 1 0 1 0 <br /> Date Analyzed 1/5/93 1/6/93 1/6/93 1/5/93 1/5/93 <br /> Instrument Identdicatlon HP-2 HP-4 HP-4 HP-2 HP-2 <br /> Surrogate Recovery, % 91 104 107 98 99 <br /> (QC Limits = 70-130%) <br /> Purgeable Hydrocarbons are quantitated against a fresh gasoline standard <br /> Analytes reported as N Q were not detected above the stated reporting limit <br /> I <br /> 16SE000IA ANALYTICAL <br /> Ott A leffo <br /> 4 <br /> Project Manager 2121175 KEI <t> <br />