D.C. Mun. Regs. r. 20-2703
Sounds emanating from vehicles using only rails and tracks shall, to the extent indicated, be exempt from the specific noise limitations contained in § 2701 of this chapter; Provided, that the exemption shall not preclude enforcement under any other section of Chapters 27 and 28 of this subtitle.
Vehicles propelled only upon rails and tracks shall be exempt at all times.
Railroad cars operated by the Washington Metropolitan Area Transit Authority shall be operated in a manner so as not to emit maximum noise levels in excess of those established in the following table when measured at a distance of one hundred feet (100 ft.) from the center line of the track, or at the nearest property line, whichever is the greater distance from the center line of track.
ZONE | MAXIMUM NOISE LEVEL |
Residential, special purpose, or waterfront zone | 75 dB(A) |
Commercial or light- manufacturing zone | 80 dB(A) |
Industrial zone | 90 dB(A) |
In taking a measurement pursuant to § 2703.3, the slow meter response of the sound level meter shall be used, and the measurement shall be taken approximately five feet (5 ft.) above grade.
D.C. Mun. Regs. r. 20-2703