Wisconsin Mound Soil Absorption System and Area FillPractice Exam

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What is a requirement of the area fill mound system regarding the topsoil layer?

It must remain intact
It should be enhanced with gravel
It must be removed
It can be filled with any type of soil

The correct answer is: It must be removed

In the context of an area fill mound system, the topsoil layer is a crucial component for maintaining proper drainage and promoting healthy vegetation growth. The requirement to remove the topsoil layer allows for the installation of the mound system itself, ensuring that the fill material can be properly placed and compacted to meet design specifications. When the topsoil is removed, it not only provides space for the engineered fill but also helps prevent soil compaction at the surface, which can alter drainage patterns and reduce the effectiveness of the system. This removal helps maintain the integrity and function of the mound by allowing for the appropriate layering of materials that support wastewater treatment processes. The other options suggest maintaining or changing the topsoil in ways that could compromise the function of the mound system, such as keeping it intact or enhancing it with gravel, which are generally not conditions favorable for the efficacy of an area fill mound system.