| TDS | Total dissolved solids. |
| thermal desorption | An innovative treatment technology that heats soil to release contaminants. See technology description of Thermal Desorption. |
| total petroleum hydrocarbon (TPH) | A name given to a mass of petroleum hydrocarbon constituents present in the air, soil, or water. TPH does not distinguish between different types of fuels. |
| toxic substance | A poison; a chemical or mixture that may present an unreasonable risk of injury to health or the environment. |
| toxicity characteristic leaching procedure (TCLP) | A procedure used to identify the potential mobility of toxic wastes. |
| toxicity | A quantification of the degree of danger posed by a substance to animal or plant life. Toxicity is one of the four characteristics that makes a substance hazardous, as defined by RCRA. |
| tracer | An identifiable substance, as a dye or radioactive isotope, that can be traced through a mechanical or biological process that provides information on the process. Tracers are often used to detect the rate at which groundwater moves. |
| transpiration | The act of giving off vapor through animal or plant pores. |
| treatability study | A short-term investigation of how a particular technology will remediate wastes. Often, treatability studies are full-scale tests run for several weeks or months. |
| trichloroethylene (TCE) | A stable, low-boiling colorless liquid that is used as a solvent and in other industrial applications. |
| trinitrotoluene (TNT) | A yellow crystalline compound used chiefly as a high explosive (2,4,6-trinitrotoluene). |
| tritium | A radioactive isotope of hydrogen. It can be either in vapor or liquid phase. |
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