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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#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# 211-0490 <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 211-0490 211-0491 211-0492 211-0493 211-0494 211-0495 <br /> EB3-(35) E63-(40) EB3-(45) EB3-(50) EB3-(55) EB3-(58) <br /> Purgeable <br /> Hydrocarbons 10 N D 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 Xyienes 0 005 N D N D N D N D N D N D <br /> Chromatogram Pattern - -- - - <br /> Quality Control Data <br /> Report Limit Multiplication Factor 10 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-2 HP-2 HP-2 HP-2 HP-2 HP-2 <br /> Surrogate Recovery, % 100 99 101 105 100 98 <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 staled reporting limit <br /> i <br /> SEQUOI ANALYTICAL <br /> ott A C ieffo <br /> Project Manager 2110460 KEI <6> <br />