A manure setback from streams, lakes, and ponds with a vegetated buffer needs to be at least how many feet?

The correct answer is based on Pennsylvania regulations concerning nutrient management practices, specifically the guidelines for preventing nutrient runoff into water bodies. A manure setback of at least 100 feet from streams, lakes, and ponds with a vegetated buffer is intended to protect water quality and reduce the risk of nutrient pollution.

This setback requirement is designed to provide an adequate distance for vegetative buffers to absorb and filter out nutrients, sediment, and pathogens that may be present in manure before they can enter waterways. By requiring a minimum of 100 feet, the regulation acknowledges the capacity of natural vegetation to act as a protective barrier, enhancing water quality and maintaining the integrity of aquatic ecosystems.

In contrast, the other distances outlined in the options are not sufficient for providing the same level of protection and are therefore not in line with the regulatory standards established to promote sustainable agricultural practices and safeguard water resources in Pennsylvania.