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` SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> preaflan engineering, Inc Client Project ID Unocal#5M,5606 Pacific Ave,Stockton Sampled 5/20&5/21/92}' <br /> 2401 Stanwell Drive, Suite 400 Matrix Descript Soil Received May 22, 1992 <br /> ,Concord, CA 94520 Analysis Method EPA 5030/8015/8020 Analyzed 5/29-6/1/92 <br /> 'Attention Mardo Kaprealian, P E First Sample # 205-1170 Reported Jun 9, 1992 <br /> TOTAL PETROLEUM FUEL HYDROCARBONS with BTEX DISTINCTION (EPA 8015/8020) <br /> Sample Sample Low/Medium B.P Ethyl <br /> Number Description Hydrocarbons Benzene Toluene Benzene Xylenes <br /> mg/kg mg/kg mg/kg mg/kg mg/kg <br /> (ppm) (ppm) (ppm) (Ppm) (Ppm) <br /> 205-1170 MW10-(55) N D 00072 N D 0 012 N D <br /> 205-1171 MW10-(60) 22 0 053 016 0 062 033 <br /> 205-1172 MW10-(63 5) 73 00060 0 016 0 011 0 027 <br /> 205-1173 MW11 -(49) 700 92 19 80 39 <br /> 205-1174 MW11 -(55) 11 22 1 5 010 060 <br /> 205-1175 MW11-(60) 45 068 048 0 027 017 <br /> 205-1176 MW12-(50) N D 00090 N D N D N D <br /> 205-1177 MW12-(55) 11 0 055 0 040 0 012 0 085 <br /> 205-1178 MW12-(60) N D 0 072 0 017 00065 0 015 <br /> ,, <br /> 205-1179 MW12-(64) N D 00081 0 028 0 011 0 025 <br /> Method Detection Limits: 1.0 00050 00050 00050 00050 <br /> Low to Medium Boiling Point Hydrocarbons are quantitated against a gasoline standard <br /> 'REQUOIA ANALYTICAL <br /> colt A Chieffa <br /> 2051170 KEI <1> <br /> Project Manager <br />