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.� SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue a Suite LM * Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> prealian Engineering, Inc Client Project ID Former Unocal Bulk Plant#0950,Stockton Sampled Feb 27, 1993 <br /> 401 Stanwell Dr, Ste 400 Sample Matrix Water Received Mar 1, 1993 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015/8020 Reported Mar 11, 1993 <br /> Attention Mardo Kapreahan, P E First Sample# 303-0015 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample <br /> Analyte Limit I D. 1 D <br /> µg/L 303-0015 Matrix <br /> MW 7 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 /> Total Xylenes 0 5 N D <br /> Chromatogram Pattern - <br /> Quality Control Data <br /> Report Limit Multiplication Factor 10 1 0 <br /> Date Analyzed 3/1/93 3/1/93 <br /> Instrument identification HP-2 HP-2 <br /> Surrogate Recovery, % 100 103 <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 /> �EIDUOIA ANALYTICAL <br /> r <br /> Cott C Ieffo <br /> Project Manager 3030009 KEI <2> <br />