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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> MPDS Services, Inc Client Project 1D Unocal#6981 4707 Pacific Ave, Stockton Sampled Jan 17-18, 1994 <br /> 2401 Stanwell Dr , Ste 400 Sample Matrix Water Received Jan 19, 1994 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015/8020 Reported Jan 31, 1994 <br /> Attention Avo Avedissian First Sample# 401-0940 <br /> TOTAL PURCEABLE 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 401-0940 401-0941 401-0942 401-0943 401-0944 401-0945 <br /> MW-1 MW-2 MW-3 MW-4 MW-5 MW-6 <br /> Purgeabie <br /> Hydrocarbons 50 990 14,000 1,200 3,800 23,000 570 <br /> Benzene 05 15 1,800 30 160 13,000 36 <br /> Toluene 05 10 31 88 47 100 094 <br /> Ethyl Benzene 05 39 29 24 23 N D 91 <br /> Total Xylenes 05 150 120 94 110 75 24 <br /> Chromatogram Pattern Gasoline Gasoline Gasoline Gasoline Gasoline Gasoline <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 20 10 20 100 10 <br /> Date Analyzed 1/26/94 1/26/94 1/26/94 1/26/94 1/27/94 1/26/94 <br /> Instrument Identification HP-4 HP-4 HP-4 HP-4 HP-4 HP-5 <br /> Surrogate Recovery, % 95 96 96 95 98 85 <br /> (QC 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 /> 1 <br /> A n em <br /> Project Manager <br /> 4010940 MPD <1;� <br />