All wind energy systems shall comply with the following:
a.
Between a residential use or zone, sound levels of the wind energy system shall not exceed a 55 dBA at a common property line and 50 dBA to the closest occupied structure.
b.
In all other cases at a common property line sound levels of the wind energy system shall not exceed 65 dBA.
c.
These levels may be exceeded during short-term events such as utility outages and/or severe windstorms, for a maximum of four hours.