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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9889 <br /> Alton Geoscience Client Project ID Mobil #04-NP4/30-140-01 Sampled 12/10-11/91 <br /> 1000 Burnett Street, Suite 140 Matnx Descrlpt Water Received Dec 11, 1991 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015/8020 Analyzed Dec 12, 1991 <br /> Attention Trldib Guha First Sample# 112-0391 Reported Dec 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 /> M9/L Ng/L N9/L Mg/L Ng/L <br /> (Ppb) (ppb) (ppb) (ppb) (ppb) <br /> 112-0391 MW-6 7,500 170 69 350 60 <br /> I <br /> Detection Limits. 300 3 0 30 3 0 3.0 <br /> Low to Medium Boiling Points Hydrocarbons are quantitated against a gasoline standard <br /> Analytes reported as N D were not present above the stated lima of detection Because matrix effects and/or other factors <br /> required additional sample dilution,detection limits for this sample have been raised <br />• SEQUOIA ANALYTICAL <br /> ;!�LxScott A. Chieffo ' <br /> Project Manager 1120385 ALG <6> <br />