[Amended 11-19-2025 by Ord. No. 4323]
All terminology used in this chapter shall be in conformance with the applicable publications of the most current edition of the American National Standards Institute (ANSI) or its successor body. The following words and terms, as used herein, shall have the following meanings:
The logarithmic sum of the decibel levels of the full frequency range between 20 Hz and 20,000 Hz weighted to correlate to the loudness of sounds as perceived by the human ear using the A-weighted network.
The measured sound level in the area, exclusive of spontaneous, extraneous sounds, and the sound contribution of the specific source in question.
Sound lasting one second or longer, or an impulsive sound that occurs five or more times an hour.
The hours between 8:00 a.m. and 8:00 p.m.
A unit for measuring the sound-pressure level, equal to 20 times the logarithm to the base 10 of the ratio of the pressure of the sound measured to the reference pressure, which is 20 micropascals or 0.0002 microbar.
The Director of the Building and Planning Department of the Township of Lower Merion.
The constant sound level which contains the same amount of sound energy over a given time period as the fluctuating sound. It is considered to be the average sound level within each measurement period. The LEQ shall be measured on the A-weighted scale, and the time interval shall be 10 minutes.
Sound lasting less than one second.
A Type I or Type II sound level meter as specified by the most current ANSI standard using the A-weighting network as specified in the most current edition of the ANSI standard or its successor.
The hours between 8:00 p.m. and 8:00 a.m.
Land within any zoning district other than a residential district as provided in Chapter 155 of the Township Code.
Any individual, firm, corporation, association or partnership.
The boundary between adjoining lots, dwelling units, and condominium units owned, rented or leased by different persons, and also, for any two or more buildings on the same lot, the line drawn midway between any two said buildings.
Land within an LDR1; LDR2; LDR3; LDR4; MDR1; MDR2; or MDR3 Residence District as provided in Chapter 155 of the Township Code.
[Amended 2-26-2020 by Ord. No. 4184]