|
A
mound system is a soil absorption system that is elevated
above the natural soil surface using a suitable fill material,
such as quality sand media. Wastewater is first pretreated
then fed by gravity to a pump chamber where the effluent is
dosed to the mound system. The purpose of the design is to
overcome site restrictions, such as slowly permeable soils,
shallow permeable soils over creviced or porous bedrock, and
permeable soils with high water tables. In an at-grade
system, the ground surface is the bottom of the trench.
Construction consists of scarifying the ground surface to
expose the existing soil and eliminating vegetation prior
to adding gravel to the ground surface.
|
 |
