[Code of Federal Regulations]
[Title 40, Volume 22]
[Revised as of July 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR201.25]

[Page 77]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 201--NOISE EMISSION STANDARDS FOR TRANSPORTATION EQUIPMENT; INTERSTATE 
RAIL CARRIERS--Table of Contents
 
                     Subpart C--Measurement Criteria
 
Sec. 201.25  Measurement location and weather conditions for measurement 
on receiving property of the noise of retarders, car coupling, locomotive 
load cell 
          test stands, and stationary locomotives.

    (a) Measurements must be conducted only at receiving property 
measurement locations.
    (b) Measurement locations on receiving property must be selected 
such that no substantially vertical plane surface, other than a 
residential or commercial unit wall or facility boundary noise barrier, 
that exceeds 1.2 meters (4 feet) in height is located within 10 meters 
(33.3 feet) of the microphone and that no exterior wall of a residential 
or commercial structure is located within 2.0 meters (6.6 feet) of the 
microphone. If the residential structure is a farm home, measurements 
must be made 2.0 to 10.0 meters (6.6 to 33.3 feet) from any exterior 
wall.
    (c) No measurement may be made when the average wind velocity during 
the period of measurement exceeds 19.3 km/hr (12 mph) or when the 
maximum wind gust velocity exceeds 32.2 km/hr (20 mph).
    (d) No measurement may be taken when precipitation, e.g., rain, 
snow, sleet, or hail, is occurring.