Georgia Septic Installer Practice Test

What are the basic layers of a Wisconsin mound system composed of?

1. Aggregate, sand, and soil

2. Clay, gravel, and sand

3. Sand, soil, and effluent

4. Soil, water, and rocks

The correct answer is: Aggregate, sand, and soil

The basic layers of a Wisconsin mound system are composed of aggregate, sand, and soil. This configuration is essential for the effective treatment and dispersal of wastewater. The aggregate layer, typically made from gravel or similar materials, provides the necessary drainage and ensures that effluent can flow through the system without pooling. The sand layer plays a crucial role in filtering the effluent, as it allows for proper percolation while also promoting the aerobic conditions needed for the treatment process. Finally, the soil layer on top supports vegetation, which helps to stabilize the mound and contribute to further filtration of the effluent. This layered approach is fundamental for the mound system's overall function, ensuring that wastewater is treated effectively before it enters the underlying ground and eventually the water table. Other combinations of materials, like clay or rocks, are not suitable for the specific requirements of a mound system, which prioritize drainage and filtration characteristics necessary for effective waste management.