Table 3.1-A presents the levels of Day-Night Sound Level (Ldn) for the N-1 and N-2 Noise Overlay Zones:
SLUCM No. | Land-Use Name | Noise Overlay Zones/Levels in Ldn | |
N-1 65-70 | N-2 70+ | ||
SLUCM No. | Land-Use Name | Noise Overlay Zones/Levels in Ldn | |
N-1 65-70 | N-2 70+ | ||
10 | Residential | 25 (1) | 30 (1) |
11 | Household units | 25 (1) | 30 (1) |
11.11 | Single units - detached | 25 (1) | 30 (1) |
11.12 | Single units - semi-attached | 25 (1) | 30 (1) |
11.13 | Single units - attached row | 25 (1) | 30 (1) |
11.21 | Two units - side by side | 25 (1) | 30 (1) |
11.22 | Two units - over-under | 25 (1) | 30 (1) |
11.31 | Apartments - walk up | 25 (1) | 30 (1) |
11.32 | Apartments - elevator | 25 (1) | 30 (1) |
12 | Group quarters | 25 (1) | 30 (1) |
13 | Residential quarters | 25 (1) | 30 (1) |
15 | Transient lodgings, hotels, motels | Y (2) | Y (3) |
16 | Other residential | 25 (1) | 30 (1) |
Notes: | |||
1. All residences in the N-1 Noise Overlay Zone are marginally noise compatible and shall be soundproofed to achieve a 25 dB reduction from outdoor noise levels (NLR). All residences in the N-2 Noise Overlay Zone are marginally noise compatible and shall be soundproofed to achieve a 30 dB NLR. Soundproofing will not eliminate outdoor noise problems. However, building location and site planning, design and use of berms and barriers can help mitigate outdoor noise exposure particularly from ground level sources. Measures that reduce noise at a site should be used wherever practical in preference to measures which only protect interior spaces. | |||
2. Measures to achieve NLR of 30 shall be incorporated into the design and construction of portions of the following buildings where the public is received: office areas; noise sensitive areas; or where the normal noise level is low. | |||
Key to Table: | |||
SLUCM - Standards Land-Use Coding Manual, U.S. Urban Renewal Administration and Bureau of Public Roads, 1965 | |||
Y (Yes) - Land use and related structures compatible without restrictions | |||
N (No) - Land use and related structures are not compatible and should be prohibited | |||
NLR - Noise level reduction (outdoor to indoor) to be achieved through incorporation of noise attenuation into the design and construction of the structure | |||
25 or 30 - Land use and related structures are generally compatible; measures to achieve NLR of 25 or 30 dB must be incorporated into design and construction of the structure | |||
(Ord. 21-97, passed - -1997; Ord. 10-2010, passed 7-26-2010)