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j SEQUOIA ANALYTICAL <br /> 1900 Bates <br /> Avenue Suite LM 9 Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br />-'MPDS Services Client Project ID Unocal#5098,5606 Pacific Ave Stockton Sampled Dec 20, 1993 <br /> 401 Stanwell Dr, Ste 400 Sample Matrix Water Received Dec 20, 1993 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015/8020 Reported Jan 7, 1994 <br /> Attention Avo Avedissian First Sample # 312-1489 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample Sample Sample Sample <br /> Analyte Lima I D I D I D I D I D <br /> ,ug/L 312-1489 312-1490 312-1491 312-1492 Method <br /> MW-10 MW-11 MW-12 MW-13 Blank <br /> Purgeable <br /> Hydrocarbons 50 110 100,000 31,000 N D <br /> Benzene 0 5 1 1 17,000 1,600 N D <br /> Toluene 0 5 065 23,000 720 0 52 <br /> Ethyl Benzene 0 5 5 4 1,800 320 N D <br /> Total Xylenes 0 5 N D 16,000 1,900 N D <br /> Chromatogram Pattern Gasoline Gasoline Gasoline <br /> i <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 400 400 1 0 1 0 <br /> Date Analyzed 1/3/94 1/3/94 1/3/94 1/3/94 1/3/94 <br /> Instrument Identification HP-2 HP-2 HP-2 HP-2 HP-2 <br /> Surrogate Recovery, % 117 110 110 104 108 <br /> (QC Limits = 70-130%) <br /> r�uigeabla;;ydroca,bons aye yuanutatea against a tresn gasoline standard <br /> Analytes reported as N D were not detected above the stated reporting limit <br /> SEQUOIA A ALYTICAL <br /> r <br /> A Kemp' <br /> Project Mana r <br /> 3121489 MPD <1> <br />