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

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GAC (granulated activated carbon)A highly porous form of carbon with very even and large pore volume, often made from coconut shells. The high porous structure of activated carbon provides a very large surface area for absorption.
gas chromatographyA laboratory technique to identify organic compounds by detecting the rate at which they pass through a column. This technique is often used to separate compounds and used in conjunction with mass spectroscopy.
ground-penetrating radar (GPR)A technology that emits pulses of electromagnetic energy into the ground. It measures the reflection and refraction by subsurface layers and other features, such as buried debris.
groundwaterThe water in the area of the subsurface that is saturated. That is, the pores between such materials as sand, soil, or gravel are filled with water.
groutA mixture of water and cement used in sealing wells and to retard water flow.

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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