Soil Gas: Gaseous elements and compounds in the small spaces between particles of the earth and soil. Such gases can be moved or driven out under pressure.
Soil Moisture: The water contained in the pore space of the unsaturated zone.
Soil Gases: Gases that enter a building from the surrounding ground (e.g., radon, volatile organics, pesticides).
Soil gas survey
Soil gas or (soil vapor) is air existing in void spaces in the soil between the groundwater and the ground surface. These gases may include vapor of hazardous chemicals as well as air and water vapor.
When the pores are not filled with water they provide space for the movement of soil gases. This is particularly important in flooded situations, where restricted movement of gases could allow toxic organic compounds to accumulate.
A vehicle-mounted, hydraulically-powered, soil probing device that utilizes static force and percussion to advance small diameter sampling tools into the subsurface for collecting soil core, soil gas, or groundwater samples.
 See also: Gas, Water, Liquid, Table, Well
  
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