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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 #04-343/30-0136-01 Sampled: Feb 21, 1992 <br /> 5870 Stoneridge Drive, Suite 6 Matrix Descript: Water Received: Feb 24, 1992 <br /> Pleasanton, CA 945M Analysis Method: EPA 5030/8015/8020 Analyzed: Feb 25, 1992 <br /> Attention: Stephan Rosen First Sample #: 202-0874 Reported: Mar 3, 1992 <br /> TOTAL PETROLEUM FUEL HYDROCARBONS with BTEX DISTINCTION (EPA 8015/8020) <br /> i <br /> Sample Sample Low/Medium B.P. Ethyl <br /> Number Description Hydrocarbons Benzene Toluene Benzene Xylenes <br /> Ng/L Ng/L Yg/L Ng/I- fig/L <br /> (ppb) (ppb) (ppb) (ppb) (ppb) <br /> 202-0874 AW-2 N.D. N.D. N.D. N.D. N.D. <br /> 202-0875 AW-4 N.D. N.D. N.D. N.D. N.D. <br /> 202-0876 AW-8 N.D. N.D. N.D. N.D. N.D. <br /> 202-0877 AW-6 N.D. N.D. N.D. N.D. N.D. <br /> 202-0878 AW-7 N.D. N.D. N.D. N.D. N.D. <br /> 202-0879 AW-5 N.D. N.D. N.D. N.D. N.D. <br /> 202-0880 AW-1 N.D. N.D. N.D. N.D. N.D. <br /> 2024881 AW-3 N.D. N.D. N.D. N.D. N.D. <br /> Detection Limits: 30 0.30 0.30 0.30 0.30 <br /> Low to Medium Boiling Point Hydrocarbons are quantitated against a gasoline standard. <br /> Analytes reported as N.D.were not present above the stated limit of detection. <br /> SEQUOIA ANALYTICAL <br /> 0Chleffo <br /> Project Manager <br /> 2020874.Al_T <1> <br />