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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686 9066 • FAX (510) 686-9689 <br /> Alton Geoscience Client Project ID 30-140-01 Sampled Sep 25, 1991 <br /> 1000 Burnett St #140 Matrix Descript Water Received Sep 26, 1991 <br /> Concord ,CA 94520 Analysis Method EPA 5030/8015/8020 Analyzed Oct 2, 1991 <br /> Attention Tridib Gruha First Sample # 109-1918 Reported Oct 14, 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 /> Y9/L N9/L p9/L N9/L N9/L <br /> (ppb) (ppb) (ppb) (ppb) (ppb) <br /> 109-1918 MW-4 810 70 49 12 110 <br /> 109-1919 MW-5 1,800 120 39 79 94 <br /> 109-1922 MW8 6,300 13 41 190 250 <br /> Detection Limits 300 30 3 0 3 0 30 <br /> Low to Medium Boding 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 /> 0required additional sample dilution, election limits for this sample have been raised <br /> SEG L ICAL <br /> ul lerstein <br /> r ect Manager iostsl2ALf; c2> <br />