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j SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 + FAX (510) 686-9689 <br /> Kaprealian Engineering, Inc Client Project ID Unocal s/s#5421,7303 Pacific Ave, Sampled Aug 21, 1992 <br /> 2401 Stanwell Drive, Suite 400 Sample Matrix Water Stockton Received Aug 24, 1992 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015/8020 Reported Aug 25, 1992 <br /> Attention Mardo Kaprealian, P E First Sample# 208-0955 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample <br /> Analyte Limit I D. I.D. <br /> Mg/L 208-0955 Matrix <br /> WATER WELL Blank] <br /> Purgeable <br /> Hydrocarbons 50 300 N D <br /> Benzene 0 5 N D N D <br /> Toluene 0 5 N D N D <br /> Ethyl Benzene 0 5 N D N D <br /> Total Xylenes 0 5 21 N D <br /> Chromatogram Pattern Non Gasoline -- <br /> Mixture <br /> (>C8) <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 1 0 <br /> Date Analyzed 8/24/92 8/24/92 <br /> Instrument Identification HP-4 HP-4 <br /> Surrogate Recovery, % 93 92 <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 /> SEQU A ANALYTICAL <br /> r <br /> S Ott A hieffo <br /> Project Manage 2080955 KEI <1> <br />