area where free product has been transported through soils due to a fluctuating water table; a zone in soil that is either above or below the water table at any given time

equilibrium between gas and solid; force exerted by the gas or vapor released by a liquid or solid substance in a closed container; an indication of a liquid’s evaporation rate

organic chemicals that are easily evaporated at normal room temperature; BTEX chemicals, benzene, ethylene, glycol, formaldehyde

above the explosive/flammable range; the mixture is to rich to burn; also known as the “Upper Flammable Limit”

area between the ground surface and the aquifer’s water table within which the moisture content is less than the saturation and the pressure is less than atmospheric; soil pore spaces in this zone may contain air or other gases; also known as the “Vadose Zone“

all parties with a direct or indirect interest in the outcome of any activity

a description of the rock or soil strata in the subsurface, particularly the sequence of layer

amount of inorganic materials such as minerals, salts, metals, cations, or anions dissolved in water

unconsolidated materials above bedrock

relative capability of being dissolved