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y' SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Since LM • Concord California 94520 <br /> (510) 686 9600 e FAX (510) 686 9689 <br /> Alton Geosclence Client Project ID Mobil #10-NP4/30-0140-02 Sampled Mar 25, 1992 <br /> 5870 Stoneridge Rd . Suite 6 Matrtx Descript Water Received Mar 26, 1992 <br /> Pleasanton, CA 94588 Analysis Method EPA 5030/8015/8020 Analyzed Mar 27, 1992 <br /> Attention Stephan Rosen First Sample # 203-1193 Reported Apr 2, 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 /> 1a9/L Ng/L Ng/L pg/L pg/L <br /> (ppb) (ppb) (ppb) (ppb) (ppb) <br /> 203-1193 MM 5,100 920 30 990 360 <br /> Detection Limits: 15d 1 5 1 5 1.5 1 5 <br /> Low to Medium Boiling Pani Hydrocarbons are quantitated against a gasoline standard <br /> An"s reported as N 0 were not present above the stated limit of detection Because matrix effects and/or other factors <br /> required additional sample dilution,detection limits for this sample have been rased <br />*SEQUOIA ANALYTICAL <br /> Scott A h o <br /> Project Manager <br />