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SEQUOIA ANALYTICAL <br /> � ICAL <br /> 1900 Bates Avenue • Suite LM 0 Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> *MPDS Services, Inc Client Project 1D Unocal#2859,1665 Pacific Ave, Stockton Sampled Feb 18, 1994 <br /> 2401 Stanwell Dr, Ste 400 Sample Matrix Water Received Feb 18, 1994 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015/8020 Reported Mar 8, 1994 <br /> Attention Avo Avedlssian First Sample # 402-1427 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample Sample Sample Sample Sample <br /> Analyte Limit ID ID ID ID ID ID <br /> Mg/L. 402-1427 402-1428 402-1429 402-1430 402-1431 402-1432 <br /> MW1 MW2 MW3 MW4 MW5 MW6 <br /> Purgeable <br /> Hydrocarbons 50 N D 200,000 3,300 140 N D 11,000 <br /> Benzene 0 5 N D 25,000 85 N D N D 12 <br /> Toluene 0 5 0 88 67,000 29 090 N D 250 <br /> Ethyl Benzene 0 5 N D 5,000 240 060 N D 490 <br /> • Total Xylenes 05 1 1 28,000 720 1 4 N D 2,800 <br /> Chromatogram Pattern <br /> 9 Gasoline Gasoline Gasoline - Gasoline <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 2,000 40 1 0 1 0 20 <br /> Date Analyzed 3/1/94 3/3/94 3/3/94 3/1/94 3/3/94 3/1/94 <br /> Instrument Identification HP-2 HP-4 HP-4 HP-2 HP-4 HP-2 <br /> Surrogate Recovery, % 107 102 93 111 96 116 <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 reporting limit <br /> SEQUOIA ANALYTICAL <br /> VaMe <br /> ger <br /> 4021427 MPD <i> <br />