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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686 9689 <br /> oft-0 <br /> Afton Geoscience Client Project ID Mobil #04-NP4/30-140-01 Sampled 12/10-11/91 <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 # 112-0390 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 /> yg/L Ing/L Ng/L ug/L pg/L <br /> (ppb) (ppb) (ppb) (ppb) (Ppb) <br /> 112-0390 MW-4 1,300 100 14 62 110 <br /> I <br /> i <br /> Detection Limits 150 1 5 1 5 1.5 1.5 <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 Because matrix effects and/or other factors <br /> required additional sample dilution,detection limits for this sample have been raised <br /> SPEGUOIA ANALYTICAL <br /> Scott A. Chieffo <br /> Project Manager 1120386 ALG <5> <br />