borehole means a hole sunk into the earth for the purpose of locating, abstracting or using subterranean water and includes a spring;
Infiltration means water other than wastewater that enters a sewer system (including sewer system and foundation drains) from the ground through such means as defective pipes, pipe joints, connections, or manholes. Infiltration does not include, and is distinguished from, inflow.
Casing means a pipe or tubing of appropriate material, of varying diameter and weight, lowered into a borehole during or after drilling in order to support the sides of the hole and thus prevent the walls from caving, to prevent loss of drilling mud into porous ground, or to prevent water, gas, or other fluid from entering or leaving the hole.
spoil means excavated material which is unsuitable for use as material in the construction works or is material which is surplus to the requirements of the construction works;
Pond means a natural or man-made impoundment of water with a water surface area of one acre or less at the high water level.