How close must undisturbed earth be maintained between adjacent trench walls?

The requirement to maintain undisturbed earth between adjacent trench walls is crucial for several reasons, primarily related to the structural integrity and functionality of the septic system. In the context of septic system installation in Tennessee, maintaining a separation of 6 feet of undisturbed earth ensures that there is adequate support for the trench walls and minimizes the likelihood of collapse during or after installation.

This distance also allows for proper soil percolation and drainage, which are vital for the effective operation of a septic system. Adequate space between adjacent trenches helps prevent the blending of wastewater treatment areas and maintains the independence of each trench, promoting effective waste management and environmental protection.

The specified distance ensures that the soil retains its natural characteristics and properties, which are essential for filtering and treating wastewater before it seeps into the ground. This practice aligns with standards set by health and environmental regulations to safeguard groundwater and public health.