Except as otherwise specified in this subtitle, the maximum permissible sound levels are as set in this section for the applicable zone. Where the property line of a use coincides with a zone boundary, the level specified in this section for the zone boundary controls. Where the use is on a public street, the “property line” referred to in this section is the boundary of the public right-of-way. If the sound is from a use in a manufacturing zone, the maximum permissible sound level is:75 dB(A) at any point on the property line of the use; 70 dB(A) at any point on a boundary that separates the manufacturing zone from a commercial zone; and 70 dB(A) at any point on a boundary that separates the manufacturing zone from a residential zone. If the sound is from a use in a commercial zone, the maximum permissible sound level is:61 dB(A) at any point on the property line of the use; 64 dB(A) at any point on a boundary that separates the commercial zone from a manufacturing zone; and 58 dB(A) at any point on a boundary that separates the commercial zone from a residential zone. If the sound is from a use in a residential zone, the maximum permissible sound level is:55 dB(A) at any point on the property line of the use; 61 dB(A) at any point on a boundary that separates the residential zone from a manufacturing zone; and 58 dB(A) at any point on a boundary that separates the residential zone from a commercial zone. City Code, 1976/83, art. 11, §235(b), (c) Ord. 99-548