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4 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# 211-0502 <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 211-0502 211-0503 211-0504 211-0505 211-0506 211-0507 <br /> EB4-(35) EB4-(40) EB4-(45) EB4-(50) EB4-(55) E84-(58 5) <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 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 __ __ _ <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 1 0 1 0 1 0 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-5 HP-5 <br /> Surrogate Recovery, % 105 104 98 106 104 101 <br /> (OC 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 />�SEQUO ANALYTICAL <br /> Scott A 1 0 <br /> Project Manager 2110460 KEI <8> <br />