A. "Background sound level" means the level of all sounds in a given environment, independent of the specific source being measured.

B. "dBA" means the sound pressure level, in decibels measured using the "A" weighting network on a sound level meter. The sound pressure level, in decibels, of a sound is 20 times the logarithm to the base 10 of the ratio of the pressure of sound to a reference pressure of 20 micropascals.

C. "EDNA" means the environmental designation for noise abatement, being an area of zone (environment) within which maximum permissible noise levels are established.

D. "Health Department" means the Tacoma-Pierce County Health Department.

E. "Health Officer" means the Director of the Tacoma-Pierce County Health Department, or his authorized representative.

F. "Multi-family units" includes, but is not limited to, duplexes, triplexes, apartment houses and condominiums. The property lines of such units shall include the wall, ceilings and floors of each unit.

G. "Noise" means the intensity, duration and character of sounds, from any and all sources.

H. "Noise Control Hearing Board" means a Board which is designated by the Health Department to hear and decide noise variance cases.

I. "Noise Control Office" means that division of the Health Department which has the duties and powers established by this Chapter.

J. "Owner" includes the owner or owners of the premises or lesser estate therein, a mortgage or vendee in possession, an assignee for rents, receiver, executor, trustee or other person, firm or corporation in control of a building or property.

K. "Person" means any individual, corporation, partnership or association and the agents, employees, servants and legal successors thereof; or agency of state, county or municipal government; or agency of the federal government which is subject to the jurisdiction of the State of Washington.

L. "Property boundary" means the surveyed line at ground surface, which separates the real property owned, rented, or leased by one or more persons, from that owned, rented, or leased by one or more other persons, and its vertical extension.

M. "Racing event" means any motor vehicle competition conducted under a permit issued by a governmental authority having jurisdiction or, if such permit is not required, then under the auspices of a recognized sanctioning body.

N. "Receiving property" means real property within which the maximum permissible noise levels specified herein shall not be exceeded from sources outside such property.

O. "Shoreline" means the existing intersection of water with the ground surface or with any permanent shore connected facility.

P. "Sound level meter" means a device which measures sound pressure levels and conforms to Type 1, S1A, 2 or S2A as specified in the American national Standards Institute Specifications.