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ASEQUOIA AN <br /> LYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> aprealian Engineering, Inc Client Project 1D Unocal#6981,4707 Pacific Ave,Stockton Sampled Oct 20, 1993 <br /> 401 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 Avedessian First Sample # 310-1245 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample Sample Sample Sample Sample <br /> Analyte Limit I D I D I D I D I D I D <br /> )ug/L 310-1245 310-1246 310-1247 310-1248 310-1249 310-1250 <br /> MW-7 MW-8 MW-9 MW-10 MW-11 MW-12 <br /> Purgeable <br /> Hydrocarbons 50 3,500 92 N D N D N D N D <br /> Benzene 05 690 40 N D N D N D N D <br /> Toluene 05 34 0 72 N D N D N D N D <br /> Ethyl Benzene 05 44 0 76 N D N D N D N D <br /> is Total Xylenes 05 53 1 8 N D N D N D N D <br /> Chromatogram Pattern Gasoline Gasoline -- -- <br /> Quality Control Data <br /> Report Limit Multiplication Factor 40 1 0 1 0 1 0 1 0 1 0 <br /> Date Analyzed 10/29/93 10/27/93 10/27/93 10/27/93 10/27/93 10/27/93 <br /> Instrument Identification HP-4 HP-5 HP-5 HP-5 HP-5 HP-5 <br /> Surrogate Recovery, % 96 107 101 108 114 103 <br /> (QC Limits = 70-130%) <br /> Purgeable Hydrocarbons are quantitated against afresh gasoline standard <br /> Analytes reported as N D were not detected above the stated reporting limit <br /> SEQUOIA ANALYTICAL <br /> Alan g" emp <br /> ct Manage <br /> 3101239 KEI <2> <br />