553.09 EXEMPTIONS. The following noise sources and activities are exempt from regulation under this chapter. (a) Emergency work, emergency energy release devices, or facility-wide warning devices. (b) Back-up alarms so long as they are self-adjusting to ambient sound levels. (c) Noises resulting from any authorized emergency vehicle when responding to an emergency call or acting in time of emergency. (d) Any other noise resulting from activities of a temporary duration permitted by law and for which a variance has been granted by the City in accordance with Section 553.10 . Regulation of noises emanating from operations under permit shall be according to the conditions and limits stated on the variance and contained in Section 553.10 . (e) Noises made by persons having obtained a variance to use the streets for open-air special events, such as fairs, festivals, concerts, etc. (f) All noises coming from the normal operations of aircraft (not including scale model aircraft). (g) Unamplified bells, chimes or carillons while being used in conjunction with on-going religious services. (h) Non-amplified crowd noises. (i) Agricultural activities, when all internal combustion engines are equipped with a properly functioning muffler. (j) Impulse sound resulting from the controlled detonation of explosives at quarries and construction sites (k) Sanitation vehicles on a public right of way.

   (l)    Road construction or maintenance projects.    (m)    Normal operation of a handgun, rifle, shotgun, skeet shooting or trapshooting range which was sited and in operation prior to the enactment date of this code.       (Ord. 1612. Passed 4-13-15.)