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The follow definitions are used in the description of the cleanup technologies

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TDSTotal dissolved solids.
thermal desorptionAn 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 substanceA 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.
toxicityA 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.
tracerAn 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.
transpirationThe act of giving off vapor through animal or plant pores.
treatability studyA 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).
tritiumA radioactive isotope of hydrogen. It can be either in vapor or liquid phase.

Note: A majority of the terms and definitions are based on the U.S. Environmental Protection Agency's Brownfields Innovative Technology Glossary . Some definitions have been modified/enhanced to support the Tech Tree text.

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This page was last updated OCTOBER 26, 1998
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