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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686 9600 • FAX (510) 686-9689 <br /> Alton Geoscience Client Project ID Mobil #04-NP4/30-140-01 Sampled Dec 10, 1991 <br /> 1000 Burnett Street, Suite 140 Matrix Descript Water Received Dec 11, 1991 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015/8020 Analyzed Dec 12, 1991 <br /> Attention Tridib Guha First Sample # 112-0387 Reported Dec 17, 1991 <br /> TOTAL PETROLEUM FUEL HYDROCARBONS with BTEX DISTINCTION (EPA 8015/8020) <br /> Sample Sample Low/Medium 8 P Ethyl <br /> Number Description Hydrocarbons Benzene Toluene Benzene Xylenes <br /> Ng/L Ng/L Ng/L Ng/L pg/L <br /> (ppb) (ppb) (ppb) (Ppb) (ppb) <br /> 112-0387 MW-5 720 46 34 38 58 <br /> Detection Limits- 6o 060 060 0.60 0 60 <br /> Analyies reported as N D 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 reused <br /> SEQUOIA ANALYTICAL <br /> w <br /> Scott A. Chieffo <br /> Project Manager 1120386 ALG 4> <br />