543.05  INDUSTRIAL PROPERTY ADJOINING RESIDENTIAL PROPERTY.
   Any activity located on property in an industrial zone adjoining a residential zone, whether open or enclosed, shall not exceed, at any point on or beyond any lot line, the maximum sound pressure level set forth in the table below:
Maximum Permitted Sound Pressure Level dB(A)
 
8:00 p.m.
6:00 a.m. to 8:00 a.m.
8:00 a.m
to
to
6:00 a.m.
6:00 p.m. to 8:00 p.m. 
6:00 p.m.
55
60
62
(1964 Code Sec. 99.05)