Wisconsin Mound Soil Absorption System and Area FillPractice Exam

What requires the removal of vegetation, organic matter, and darkly colored topsoil from the entire mound footprint?

1. Conventional mound systems

2. Area fill mound systems

3. Traditional septic systems

4. Surface water drainage systems

The correct answer is: Area fill mound systems

The correct answer focuses on area fill mound systems, which necessitate the removal of vegetation, organic matter, and darkly colored topsoil from the entire mound footprint. This is essential for several reasons. In an area fill mound system, the goal is to create a proper environment for effluent infiltration and treatment. The removal of vegetation and organic material is crucial because they can retain moisture and impede the required soil conditions for effective absorption. Organic matter can also lead to compaction over time, which interferes with water movement through the soil. Darkly colored topsoil often has a different texture and drainage capacity compared to the underlying soil layers, which can also affect the performance of the mound system. By stripping away this layer, the installation ensures that only the soil types that support optimal drainage and absorption characteristics are present. This process aids in achieving uniform soil moisture and enhances the overall efficiency of the system in treating wastewater. Understanding this context clarifies why area fill mound systems specifically require these preparatory steps, while conventional mound systems, traditional septic systems, and surface water drainage systems do not have the same stringent requirements regarding the removal of vegetation and topsoil.