impermeable surface means a surface or pavement constructed and maintained to a standard sufficient to prevent the transmission of liquids beyond the pavement surface, and should be read in conjunction with the term “sealed drainage system” (below).
Underground area means an underground room, such as a basement, cellar, shaft or vault, providing enough space for physical inspection of the exterior of the tank situated on or above the surface of the floor.
Accessible surface means surface of equipment or of an equipment part that can be easily or accidentally touched by persons without the use of a tool.
Potable means water suitable for drinking by the public.
water meter means any apparatus for measuring or showing the volume of water supplied to, or of effluent discharged from any premises;