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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue * Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> W'preJlan Engineering,Inc n YClien't Project Ib Unocal#5098,5606 Pacific Ave,Stockton Sampfed n" May721, 1992 <br /> ;2401 Stanwell Drive, Suite 400 Matrix Descnpt Sal 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# 205-1180 Reported Jun 9, 1992 <br /> r . +. ir. ..L wvn4.vv + • v }` Bryn n+.+.t . ry } r v n .vv.v ,.. v ,. v r } v- ruv t N.vv v. i ry V} 1 z }v <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 /> 205-1180 Mw12-(68 5) 16 0 085 0 057 0 051 0 075 <br /> Method Detection Limas: 1.0 0.0050 0.0050 0.0050 0.0050 <br /> Low to Medium Boiling Point Hydrocarbons are quantitated against a gasoline standard <br /> *SEQUOIA ANALYTICAL <br /> Scott A ChiefFo 2051170 KEI <2> <br /> Project Manager <br />