What happens in 'soil mapping' during soil evaluation?

Soil mapping during soil evaluation involves observing and recording the various boundaries, characteristics, and types of soil present in a designated area. This process is crucial for understanding the distribution and properties of the soil, which can directly affect the design and installation of septic systems. The mapping helps identify different soil types, drainage patterns, and potential challenges that may arise when installing a septic system.

By documenting these boundaries, professionals can make informed decisions regarding the septic system's placement, ensuring it functions effectively and meets regulatory requirements. This enables them to assess aspects such as permeability, soil depth, and the likelihood of groundwater contamination, which are essential for a successful installation. The other options, while relevant to soil evaluation, do not specifically focus on the aspect of mapping and understanding the layout and types of soils involved.