FHWA noise table
TABLE
1 |
|||
Activity
Category |
Leq
(h) |
L10(h) 2 |
Description of Activity Category |
A |
57
(exterior) |
60
(exterior) |
Lands where serenity and quiet are of extraordinary significance and serve an important public need and where the preservation of those qualities is essential if the area is to continue to serve its intended purpose. |
B |
67
(exterior) |
70
(exterior) |
Picnic area, recreation area, playgrounds, active sports, parks, residences, motels, hotels, schools, churches, libraries, and hospitals. |
C |
72
(exterior) |
75
(exterior) |
Developed lands, properties, or activities not included in Categories A or B above. |
D |
-- |
-- |
Undeveloped lands. |
E |
52
(interior) |
55
(interior) |
Residences, motels, hotels, public meeting rooms, schools, churches, libraries, hospitals, and auditoriums. |
1Federal-Aid Highway
Program Manual; Vol. 7, Ch. 7, Sec. 3, Attachment, Transmittal 348, 8/9/82.
2 Either L10(h) or Leq(h) (but not both) may be used on a project. This
report uses the L10(h) per MPCA standards.
TABLE
2 |
|||
Category | General
Land Use Types |
Daytime
Noise Levels (7 A.M. to 10 P.M.) |
Nighttime
Noise Levels (10 P.M. to 7 A.M.) |
NAC-1 | Residential
& Institutional |
L10 of 65 dBA L50 of 60 dBA |
L10 of 55 dBA L50 of 50 dBA |
NAC-2 | Commercial
& Recreational |
L10 of 70 dBA L50 of 65 dBA |
L10 of 70 dBA L50 of 65 dBA |
NAC-3 | Industrial |
L10 of 80 dBA L50 of 75 dBA |
L10 of 80 dBA L50 of 75 dBA |
1 Minnesota Statutes Chapter 7010--Noise Pollution Control--Subp.