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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue - Suite LM - Concord, California 94520 <br /> (510) 686-9600 - FAX (510) 686-9689 <br /> IlWaprealiari Engineering, Inc Client Project 1D Unocal,7303 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 11, 1993 <br /> Attention Mardo Kapreallan, P E First Sample # 212-1171 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample Sample Sample Sample <br /> Analyte Limit LD I D I D I D. I D <br /> pg/L 212-1171 212-1172 212-1173 212-1174 Matrix <br /> MW 1 MW 2 MW 3 MW 4 Blank <br /> Purgeable <br /> Hydrocarbons 50 N D N D N D N D <br /> Benzene 05 N D N D 069 N D <br /> Toluene 0 5 N D N D 0 67 N D <br /> Ethyl Benzene 05 N D N D N D N D <br /> Total Xylenes 05 N D N D 0 89 0 60 <br /> Chromatogram Pattern -- -- -- <br /> ©uaidy Control Data <br /> Report Limit Multiplication Factor 10 1 0 1 0 10 10 <br /> Date Analyzed 1/5/93 1/5/93 1/5/93 1/8/93 1/5/93 <br /> Instrument Identification HP-2 HP-2 HP-2 HP-4 HP-2 <br /> Surrogate Recovery, % 100 100 98 102 99 <br /> (QC Limits = 70-130%) <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 />�SEQUOI ANALYTICAL <br /> cott A leffo <br /> Project Manager 2121171 KEi ¢1> <br />