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1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> • (510) 686-9600 9 FAX (510) 686-9689 <br /> � <br /> prealian Engineering, Inc Client Project ID Unocal#2859, 1665 Pacific Ave Stockton Sampled Nov 12, 1993 <br /> 01 Stanwell Dr, Ste 400 Sample Matrix Water Received Nov 13, 1993 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015/8020 Reported Dec 3, 1993 <br /> Attention Avo Avedessian First Sample # 311-1358 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample <br /> Analyte Limit ID ID <br /> pg/L 311-1358 Matrix <br /> MW7 Blank <br /> Purgeable <br /> Hydrocarbons 50 N D <br /> Benzene 05 N D <br /> Toluene 05 N D <br /> Ethyl Benzene 05 N D <br /> is Total Xylenes 0 5 4 7 <br /> Chromatogram Pattern - <br /> Duality Control Data <br /> Report Limit Multiplication Factor 1 0 1 0 <br /> Date Analyzed 11/24/93 11/24/93 <br /> Instrument Identification ML#2 ML#2 <br /> Surrogate Recovery, % 102 103 <br /> (OC Limits = 70-130%) <br /> Purgeable Hydrocarbons are quantitated against afresh gasoline standard <br /> Analytes reported as N D were not detected above the stated reporting limit <br /> SECaUOIA ANALYTICAL <br /> ri - <br /> Al em <br /> Pr ject Manage <br /> 3111352KE] <2> <br />