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` SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue * Suite LM * Concord, California 94520 <br /> (510) 686-9066 * FAX (510) 686-9689 <br /> Kapreahan Engineering, Inc Client Project ID Unocal, Stocton, 7303 Pacific Ave Sampled Sep 27, 1991 <br /> P 0 Box 996 Matrix Descrlpt Water Received Sep 27, 1991 <br /> Benicia, CA 94510 Analysis Method EPA 5030/8015/8020 Analyzed Oct 4, 1991 <br /> Attention Mardo Kaprealian, P E First Sample# 109-2165 Reported Oct 17, 1991 <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 /> pg/L Fig/L lig/L u9/L Ng/L <br /> (ppb) (ppb) (ppb) (ppb) (ppb) <br /> 109-2165 Mw1 N D N D N D N D N D <br /> 109-2166 MW2 N D N D N D N D N D <br /> 109-2167 Mw3 N D N D N D N D N D <br /> 109-2168 Mw4 N D N D N D N D N D <br /> Detection Limas 30 030 030 030 030 <br /> Low to Medium Boiling Pont Hydrocarbons are quantitated against a gasoline standard <br /> Analytes reported as N 0 were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL <br /> �`��^� - C-4 <br /> Belinda C Vega <br /> Laboratory Director <br /> 1092165 KEl <1> <br />