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SEQUOIA ANALYTICAL <br /> 1900 Sates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> 4 Kapreallan Engineering, Inc Client Project ID Unocal#5421,7303 Pacific Ave,Stockton Sampled Nov 10, 1992 <br /> 2401 Stanwell Drive, Suite 400 Sample Matrix Soil Received Nov 11, 1992 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015/8020 Reported Nov 25, 1992 <br /> Attention Mardo Kaprealian, P E First Sample# 211-0508 <br /> TOTAL PURGEABLE 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 /> mg/kg 211-0508 211-0509 211-0510 211-0511 211-0512 211-0513 <br /> EB5-(4) EB5-(7) EB5-(9 5) EB6-(4) EB6-(7) EB6-(9 5) <br /> Purgeable <br /> Hydrocarbons 1 0 1 3 N D N D N D N D N D <br /> Benzene 0 005 N D N D N D N D N D N D <br /> Toluene 0 005 N D N D N D N D N D N D <br /> Ethyl Benzene 0 005 N D N D N D N D N D N D <br /> Total Xylenes 0 005 N D N D N D N D N D N D <br /> Chromatogram Pattern Non-Gasoline -- -- - - <br /> Mixture <br /> (>G8) <br /> Quality Control Data <br /> Report Lima Multiplication Factor 1 0 1 0 1 0 1 0 1 0 1 0 <br /> Date Analyzed 11/13/92 11/13/92 11/13/92 11/13/92 11/13/92 11/13/92 <br /> Instrument Identification HP-5 HP-5 HP-5 HP-5 HP-5 HP-5 <br /> Surrogate Recovery, % 106 101 107 109 111 107 <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 />. <br /> Z <br /> NALYTICAL <br /> o <br /> Project Manager 2110460 KE I <9> <br />