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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue - Suite LM - Concord, California 94520 <br /> (510) 686 9600 - FAX (510) 686-9689 L <br /> Alton Geoscience Gient Project ID Mobil #04-NP4/30-140-01 Sampled 12/10-11/91 <br /> 1000 Burnett Street, Sude 140 Matrix Descnpt Water Recenred Dec 11, 1991 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015/8020 Analyzed Dec 12, 1991 <br /> Attention Tridib Guha First Sample # 112-0386 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 /> Fig/L Fig/L N9/L Ng/L pg/L <br /> (Ppb) (ppb) (ppb) (ppb) (ppb) <br /> 112-0386 AMW-6 N D N D N D N D N D <br /> 112-0388 MW-1 N D N D N D N D N D <br /> 112-0389 MW-2 N D N D N D N D N D <br /> 112-0392 MW--r N D N D N D N D N D <br /> 112-0394 AMW 1 45 N D N D N D N D <br /> 112-0395 AMW-2 N D N D N D N D N D <br /> 112-0396 AMW-3 N D N D N D N D N D <br /> 112-0397 AMWA N D N D N D N D N D <br /> 112-0398 AMW-5 N D N D N D N D N D <br /> Detection Limits- 30 0.30 0.30 030 0.30 <br /> Low to Medlurrt Boiling Point Hydrocarbons are quantitated against a gasoline standard <br /> Analytes reported as N A were not present above the stated limit of detection <br />. SEQUOIA ANALYTICAL <br /> Scott hiefl'o <br /> Project Manager t 1203W ALG <1> <br />