Section 15.48.110 Noise and vibration.

The following minimum noise and vibration standards must be complied with:

A. Noise.

1. For purposes of measuring the intensity of frequency of sound, the sound level meter, the octave band analyzer, and the impact noise analyzer shall be employed. The "C" network and the "slow" meter response of the sound level meter shall be used. Sounds of short duration, such as forge hammers, punch presses, etc., which cannot be measured accurately with the sound level meter shall be measured with the impact analyzer as manufactured by the General Radio Company, or its equivalent in order to determine the peak value of the impact.

2. The sound pressure level resulting from any activity, whether open or enclosed, shall not exceed, at any point on or beyond any lot line, the maximum permitted decibel levels for the octave band as set forth in the following table:

Maximum Permitted Sound Pressure Level

(in decibels)

33 20 to 33 75 79

13 75 to 1 100 74

1 150 to 1 300 66

1 300 to 1 600 59

1 600 to 1200 53

1200 to 2400 47

2400 to 4800 41

Above 4800 39

B. Vibration.

1. No activity shall cause or create a steady state of vibration at any point on any lot line, with a displacement in excess of the permitted steady state vibration displacement for the frequencies as set forth in the following table:

Maximum Permitted Steady State Vibration

Displacement (in inches)

Frequency

(cycles per second)

10 and below .0008

10--20 .0005

20--30 .0003

30--40 .0002

40--50 .0001

50--60 .0001

60 and over .0001

2. No activity shall cause or create an impact vibration, at any point on any lot line, with a displacement in excess of the permitted impact vibration displacement for the frequencies as set forth in the following table:

Maximum Permitted Impact Vibration

Displacement (in inches)

Frequency

(cycles per second) MI

10 and below .0016

10--20 .0010

20--30 .0006

30--40 .0004

40--50 .0002

50--60 .0002

60 and over .0002

(Prior code § 19-1-11)

15.48.110