A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Headspace: The vapor mixture trapped above a solid or liquid in a sealed vessel.

Holding Time: The maximum amount of time a sample may be stored before analysis.

Hollow Stem Auger Drilling: Conventional drilling method that uses augurs to penetrate the soil. As the augers are rotated, soil cuttings are conveyed to the ground surface via augur spirals. DP tools can be used inside the hollow augers.

Hydraulic Conductivity: A measure of the ability of groundwater to flow through (the subsurface environment) or (a soil or rock formation).

Hydraulic Gradient: In general, the direction of groundwater flow due to changes in the depth of the water table.

Hydrocarbons (HC): Chemical compounds that consist entirely of carbon and hydrogen (e.g. fuel oil, gasoline).

Hydrogeology: The geology of ground water, with particular emphasis on the chemistry and movement of water.

Hydrology: The science dealing with the properties, distribution, and circulation of water on the surface of the land or in open channel flow.

Hydrophobic: Having a strong aversion for water.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z