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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> realian Engineering,']nc Client Project ID Unocal#5098,5606 Pacific Ave ,Stockton Sampled Sep 29, 1993 <br /> 401 Stanwell Dr, Ste 400 Sample Matrix Water Received Sep 29, 1993 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015 Reported Oct 13, 1993 <br /> Attention Avo Avedessian First Sample # 309-1460 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample Sample Sample Sample <br /> Analyte Limit ID ID ID ID ID <br /> tag/L 309-1460 309-1461 309-1462 309-1463 Matrix <br /> MW-10 MW-11 MW-12 MW-13 Blank <br /> Purgeable <br /> Hydrocarbons 50 N D 51,000 20,000 N D <br /> Benzene 05 2 5 8,300 1,200 N D <br /> Toluene 05 N D 7,200 840 N D <br /> Ethyl Benzene 05 62 1,300 660 N D <br />*Total Xylenes 05 N D 4,000 1,400 N D <br /> Chromatogram Pattern -- <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 100 100 1 0 1 0 <br /> Date Analyzed 10/8/93 10/7/93 10/7/93 10/7/93 10/7/93 <br /> Instrument Identification HP-4 HP-5 HP-5 HP-5 HP-5 <br /> Surrogate Recovery, % 95 91 101 101 96 <br /> (OC 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 reparting limit <br /> QUOIA ANALYTICAL <br /> Alan mp <br /> Project Manag 6r,/ 3091460 KE] t 1> <br />