Underground storage means storage of gas in a subsurface stratum or formation of the earth.
Underground storage tank or “UST” means any one or combination of tanks (including underground pipes connected thereto) that is used to contain an accumulation of regulated substances, and the volume of which (including the volume of underground pipes connected thereto) is 10 percent or more beneath the surface of the ground. This term does not include any:
Water Surface Elevation (WSE means the height, in relation to NAVD 1988, of floods of various magnitudes and frequencies in the floodplains of riverine areas.
Acre-foot means the amount of water necessary to cover one acre of land to the depth of one foot, or 325,851 U.S. gallons of water.