(1) Operating motorized equipment or machinery such as an electric generating plant, motor vehicle, motorized toy, or an audio device, such as a radio, television set, tape deck or musical instrument, in a manner that exceeds a noise level of 60 decibels measured on the A-weighted scale at 50 feet; or that, if below that level, nevertheless makes noise which is unreasonable, considering the nature and purpose of the actor's conduct, location, time of day or night, purposes of the Presidio Trust Act, impact on visitors or tenants, and other factors that would govern the conduct of a reasonably prudent person under the circumstances.

(2) In developed areas, operating a power saw, except pursuant to the terms and conditions of a permit.

(3) In nondeveloped areas, operating any type of portable motor or engine, or device powered by a portable motor or engine, except pursuant to the terms and conditions of a permit.

(4) Operating a public address system, except in connection with a public gathering or special event for which a permit has been issued pursuant to § 1002.50 or § 1002.51.