§ 9.58.011. Definitions.

"Hz (hertz)" means a unit of measurement for pitch that describes the number of cycles per second in a sound vibration. Speech information usually falls between 200Hz and 6000Hz. "Middle C" on the piano falls at two hundred sixty-two Hz."

"Vibration perception threshold" means the minimum ground or structure-borne vibrational motion necessary to cause persons of normal sensitivity to be aware of the vibration by such direct means as, but not limited to, sensation by touch or visual observation of moving objects. The perception threshold shall be presumed to be a motion velocity of one one-tenth inches per second over the range of one to one hundred Hz. This threshold shall be applied at the location where the sensitivity exists, such as the property lines within a residential development or from the location of a residence constructed an agricultural property.

(Ord. No. 634A, § 1, 3-1-10; Ord. No. 634, § 1, 10-27-08)