For down-gradient cuts or banks with at least 5 ft. of undisturbed soil above a restrictive layer, what is the required setback from the edge of the drain field?

The requirement for a 50-foot setback from the edge of the drain field in situations involving down-gradient cuts or banks with at least 5 feet of undisturbed soil above a restrictive layer is crucial for maintaining the integrity and functionality of the septic system. This distance is established to ensure that any potential water flow or erosion does not negatively impact the septic system's operation or contaminate nearby water sources.

A setback of this magnitude allows for adequate protection against the risks of soil saturation and surface water intrusion that can compromise the septic system’s performance. It helps to prevent issues such as leachate migration or contamination of groundwater, which could arise if the drain field is too close to a downward slope where water movement is likely to occur.

This requirement also aligns with best practices in environmental protection and public health, emphasizing the significance of maintaining safe distances to mitigate risks associated with sewage and wastewater management in proximity to natural water features and residential areas.