23 CFR Table 1 to Part 772
Noise Abatement Criteria
May 21, 2020
[Hourly A-Weighted Sound Level__decibels (dB(A))1]
Open Table
| Activity category |
Activity Leq(h) | Criteria2 L10(h) | Evaluation location |
Activity description |
|---|---|---|---|---|
| A | 57 | 60 | Exterior | Lands on which 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. |
| B3 | 67 | 70 | Exterior | Residential. |
| C3 | 67 | 70 | Exterior | Active sport areas, amphitheaters, auditoriums, campgrounds, cemeteries, day care centers, hospitals, libraries, medical facilities, parks, picnic areas, places of worship, playgrounds, public meeting rooms, public or nonprofit institutional structures, radio studios, recording studios, recreation areas, Section 4(f) sites, schools, television studios, trails, and trail crossings. |
| D | 52 | 55 | Interior | Auditoriums, day care centers, hospitals, libraries, medical facilities, places of worship, public meeting rooms, public or nonprofit institutional structures, radio studios, recording studios, schools, and television studios. |
| E3 | 72 | 75 | Exterior | Hotels, motels, offices, restaurants/bars, and other developed lands, properties or activities not included in A-D or F. |
| F | Agriculture, airports, bus yards, emergency services, industrial, logging, maintenance facilities, manufacturing, mining, rail yards, retail facilities, shipyards, utilities (water resources, water treatment, electrical), and warehousing. | |||
| G | Undeveloped lands that are not permitted. |
1Either Leq(h) or L10(h) (but not both) may be used on a project.
2The Leq(h) and L10(h) Activity Criteria values are for impact determination only, and are not design standards for noise abatement measures.
3Includes undeveloped lands permitted for this activity category.
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