Occurrence sources shall be identified.
a. Area inside a building: All openings *9 of the building (shutters, hinged doors, etc.)
*9: It shall be assumed that noise in the building leaks primarily from the openings of the
building.
However, no consideration shall be given to openings that are normally closed.
b. Area outside a building: Centers of ranges where processes, equipment, facilities, etc. are installed from
which noise is generated.
[2] Ranges within a radius of 100 m from the occurrence sources identified in item [1] above shall be identified.
Those ranges which fall in areas outside of plant premises shall be regarded as environmental risk ranges
regarding noise.