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T <br /> TCP traditional cultural properties <br /> TDS total dissolved solids <br /> THPO Tribal Historic Preservation Officer <br /> TMDL total maximum daily load <br /> TOC total organic carbon <br /> TSC Technical Service Center <br /> U <br /> UMTRA Uranium Mill Tailings Remedial Action <br /> U.S.C. United States Code <br /> USGS U.S. Geological Survey <br /> UV ultraviolet <br />