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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> aprealiari Pnglneenrig, Inc Client Or6ject ID Unocal,5606'Pacrfic Ave, Stockt6n' Sampled Sep 30, 1992 <br /> 2401 Stanwell Drive, Suite 400 Sample Matrix Water Received Sep 30, 1992 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015/8020 Reported Oct 12, 1992 <br /> Attention Mardo Kapreahan, P E First Sample# 210-0027 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample Sample Sample Sample <br /> Analyte Limit ID I D. I D. I D I D <br /> Ng/L 210-0027 210-0028 210-0029 210-0030 Matrix <br /> MW 10 MW 11 MW 12 MW 13 Blank <br /> Purgeable <br /> Hydrocarbons 50 11000 42,000 16,000 N D <br /> Benzene 05 26 8,800 1,700 N D <br /> Toluene 0 5 085 6,200 1,000 N D <br /> Ethyl Benzene 0 5 46 1,600 590 N D <br /> Total Xylenes 05 10 4,400 880 0 92 <br /> Chromatogram Pattern Gasoline Gasoline Gasoline -- <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 400 100 1 0 1 0 <br /> Date Analyzed 10/1/92 10/1/92 10/6/92 10/6/92 10/11/92 <br /> Instrument Idertttficatlon HP-5 HP-5 HP-4 HP-4 HP-5 <br /> Surrogate Recovery, % 81 108 99 100 104 <br /> (QC Limits = 70-130%) <br /> Purgeable Hydrocarbons are quantitated against a fresh gasoline standard <br /> Analytes reported as N 0 were not detected above the stated reporting limit <br /> �EQUOIA ANAI,'Y71CAL <br /> ScottA hieffo <br /> Project Manager 2100027 KEI <i> <br />