Agriculture when operated in accordance with a conservation
plan, nutrient management plan or erosion and sedimentation control
plan approved by the County Conservation District, including activities
such as growing crops, rotating crops, tilling of soil and grazing
animals. Installation of new or expansion of existing farmsteads,
animal housing, waste storage and production areas having impervious
surfaces that result in a net increase in earth disturbance of greater
than 5,000 square feet shall not be exempt under this section.