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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 9, 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# 211-0496 <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 211-0496 211-0497 211-0498 211-0499 211-0500 211-0501 <br /> EB4-(5) EB4-(10) EB4-(15) EB4-(20) EB4-(25) EB4-(30) <br /> Purgeable <br /> Hydrocarbons 1 0 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 0005 ND ND ND ND ND ND <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 10 10 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-4 HP-4 HP-4 HP-4 HP-4 HP-4 <br /> Surrogate Recovery, % 105 105 108 102 105 104 <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 />.SEQUOI NALYTICAL <br /> cottACi o <br /> Project Manager 2110460 K1=i <7- <br />