Ground Plane

The surface upon which the machine is placed.

Ground Rod

This is a copper/brass rod which is hand driven into the ground and is connected to the drill rack and mats to provide adequate grounding of unit and personnel.

Ground Water Table (or Level)

Upper surface of the zone of saturation in permeable rock or soil (when the upper surface is confined by impermeable rock, the water table is absent).

Groundwater

All subsurface water, as distinct from surface water.