O Fallon City Zoning Code
AO-4
NOISE ZONES AREA
§ 157.395 PURPOSE AND GENERALLY.
(A) The purpose of this section is to require that new or redeveloped buildings within the Noise Zones Area, Airport Overlay (“AO-4”) District, be constructed with materials and in such manner that aircraft noise is reduced by the structure to an interior level which has no adverse impact on the health, safety and general welfare of the residents.
(B) The AO-4 District designates the area that primarily includes standards for the attenuation of noise.
(C) Establishment of noise zones:
(1) Buildings, structures or land shall be occupied or used only in conformity with all of the regulations set forth herein for the district in which they are located. The boundaries of the noise contour zones are shown on the map in § 157.338. There are four applicable noise zones:
(a) NZ 1: area within the noise zone where the DNL is between 65 and 69 dB;
(b) NZ 2: area within the noise zone where the DNL is between 70 and 74 dB;
(c) NZ 3: area within the noise zone where the DNL is between 75 and 79 dB; and
(d) NZ 4: area within the noise zone where the DNL is greater than 80 dB.
(2) Other industry-standard noise zones exist around the airfields. However, all land uses are considered compatible with noise levels below 65 dB. Noise Zone 4 is only located on federally controlled land.
(Prior Code, § 158.395) (Ord. 3718, passed 6-20-2011)
§ 157.396 PROCEDURES AND DESIGN REGULATIONS IN NOISE ZONES.
§ 157.397 USE REGULATIONS IN NOISE ZONES.
(A) Use and design regulations in AO-4: NZ-1.
(1) Permitted uses.
(a) Permitted uses are listed on Table 2 below; provided that no uses shall be allowed where not permitted in the underlying zoning district. When regulations within the Airport Overlay District overlap, the more stringent standard shall apply.
(b) Single-family residential density shall be limited to one dwelling unit per acre within the NZ-1.
(2) Prohibited uses.
(a) Manufactured housing shall not be permitted within the NZ-1.
(b) Outdoor amphitheaters shall not be permitted within the NZ-1.
(3) Sound attenuation.
(a) To the extent permitted by law, sound attenuation standards to achieve an NRL of at least 25 dB is required for all new or expanded hospitals, clinics, nursing homes, child care centers, schools, movie theaters, auditoriums, churches and places of worship and meditation. The requirements of this section shall apply only to the area of expansion. Expansion shall include any such work that results in an increase of the cubic content of the building or the floor or ground area devoted to the noise sensitive use or in any way increases or creates a site-related non-conformity.
(b) Sound attenuation standards to achieve an NRL of at least 25 dB are required for all new residential construction within the NZ-1.
(B) Use and design regulations in AO-4: NZ-2.
(1) Permitted uses. Permitted uses are listed on Table 2 below; provided that no uses shall be allowed where not permitted in the underlying zoning district. When regulations within the Airport Overlay District overlap, the more stringent standard shall apply.
(2) Prohibited uses.
(a) Manufactured housing shall not be permitted within the NZ-2.
(b) Outdoor amphitheaters shall not be permitted within the NZ-2.
(c) All residential uses, including hotels and overnight lodging sites, shall be prohibited within the NZ-2.
(3) Sound attenuation.
(a) To the extent permitted by law, sound attenuation standards to achieve an NRL of at least 30 dB is required for all new or expanded hospitals, clinics, nursing homes, child care centers, schools, movie theaters, auditoriums, churches and places of worship and meditation.
(b) Sound attenuation standards to achieve an NRL of at least 25 dB is required for all new or expanded structures containing office, business, retail and wholesale trade uses. Within new or expanded industrial structures, those portions of the building where the public is received, offices are located and other places where low noise levels are normally expected shall utilize sound attenuation standards to achieve an NRL of at least 25 dB.
(C) Use and design regulations in AO-4: NZ-3.
(1) Permitted uses.
(a) Permitted uses are listed on Table 2 below; provided that no uses shall be allowed where not permitted in the underlying zoning district.
(b) When regulations within the Airport Overlay District overlap, the more stringent standard shall apply.
(2) Prohibited uses.
(a) Manufactured housing shall not be permitted within the NZ-3.
(b) Outdoor amphitheaters shall not be permitted within the NZ-3.
(c) All residential uses, including hotels and overnight lodging sites, shall be prohibited within the NZ-3.
(d) All hospitals, clinics, nursing homes, child care centers, schools, movie theaters, auditoriums, churches and places of worship and meditation are prohibited.
(3) Sound attenuation. Sound attenuation standards to achieve an NRL of at least 30 dB is required for all new or expanded structures containing office, business, retail and wholesale trade uses. Within new or expanded industrial structures, those portions of the building where the public is received, offices are located and other places where low noise levels are normally expected shall utilize sound attenuation standards to achieve an NRL of at least 30 dB.
(D) Use and design regulations in AO-4: NZ-4.
(1) Permitted uses.
(a) Permitted uses are listed on Table 2 below; provided that no uses shall be allowed where not permitted in the underlying zoning district.
(b) When regulations within the Airport Overlay District overlap, the more stringent standard shall apply.
(2) Prohibited uses.
(a) Manufactured housing shall not be permitted within the NZ-4.
(b) Outdoor amphitheaters shall not be permitted within the NZ-4.
(c) All residential uses, including hotels and overnight lodging sites, shall be prohibited within the NZ-4.
(d) All hospitals, clinics, nursing homes, child care centers, schools, movie theaters, auditoriums, churches and places of worship and meditation are prohibited within the NZ-4.
(3) Sound attenuation.
(a) Sound attenuation standards to achieve an NRL of at least 30 dB is required for all new or expanded structures containing office, business, retail and wholesale trade uses.
(b) Within new or expanded industrial structures, those portions of the building where the public is received, offices are located and other places where low noise levels are normally expected shall utilize sound attenuation standards to achieve an NRL of at least 30 dB.
(E) Permitted land uses in AO-4: Noise Zones.
(1) (a) Table 2 below describes those uses that are permissible within the areas designated as noise zones.
(b) Within Table 2 below, the designation with the letter “Y” indicates that the land use is permissible, subject to compliance with the standards of this chapter.
(2) The designation “PS 25” indicates that the land use is permissible, subject to compliance with the standards of this chapter and demonstrating noise reduction materials have been incorporated into the design and construction of proposed development in a manner that achieves a noise level reduction of 25 dB.
(3) The designation “PS 30” indicates that the land use is permissible, subject to compliance with the standards of this chapter and demonstrating noise reduction materials have been incorporated into the design and construction of proposed development in a manner that achieves a noise level reduction of 30 dB.
(4) The designation with the letter “N” indicates the land use is prohibited.
(5) The recommendations for permitted and prohibited types of facilities or land uses by noise level reduction are based on the United States Department of Transportation and Federal Aviation Administration (“FAA”) charts for aircraft noise avoidance.
Land Use | Airport Overlay AO-4 Noise Zones (dB) | ||||
SLCUM | Name | NZ 1 65-69 | NZ 2 70-74 | NZ 3 75-79 | NZ 4 80+ |
10 | Residential | ||||
11 | Household units | ||||
11.11 | Single units; detached | PS 25 | N | N | N |
11.12 | Single units; semi-detached | N | N | N | N |
11.13 | Single units; attached row | N | N | N | N |
11.21 | Two units; side-by-side | N | N | N | N |
11.22 | Two units; stacked | N | N | N | N |
11.31 | Apartments; walk up | N | N | N | N |
11.32 | Apartments; elevator | N | N | N | N |
12 | Group quarters | N | N | N | N |
13 | Residential hotels | N | N | N | N |
14 | Mobile home parks or courts | N | N | N | N |
15 | Transient lodgings | N | N | N | N |
16 | Other residential | N | N | N | N |
20 | Manufacturing | ||||
21 | of food and kindred products | Y | PS 25 | PS 30 | PS 30 |
22 | of textile mill products | Y | PS 25 | PS 30 | PS 30 |
23 | of apparel and other finished products made from fabrics, leather and similar materials | Y | PS 25 | PS 30 | PS 30 |
24 | of lumber and wood products (except furniture) | Y | PS 25 | PS 30 | PS 30 |
25 | of furniture and fixtures | Y | PS 25 | PS 30 | PS 30 |
26 | of paper and allied products | Y | PS 25 | PS 30 | PS 30 |
27 | of printing, publishing and allied industries | Y | PS 25 | PS 30 | PS 30 |
28 | of chemicals and allied products | Y | PS 25 | PS 30 | PS 30 |
29 | of petroleum refining and related industries | Y | PS 25 | PS 30 | PS 30 |
30 | Manufacturing | ||||
31 | Rubber and miscellaneous plastic products | Y | PS 25 | PS 30 | PS 30 |
32 | Stone, clay and glass products | Y | PS 25 | PS 30 | PS 30 |
33 | Primary metal industries | Y | PS 25 | PS 30 | PS 30 |
34 | Fabricated metal products | Y | PS 25 | PS 30 | PS 30 |
35 | Professional and scientific instruments | Y | PS 25 | PS 30 | N |
39 | Miscellaneous manufacturing | Y | PS 25 | PS 30 | PS 30 |
40 | Transportation, communications and utilities | ||||
41 | Railroad, rapid rail transit and street railroad transportation | Y | PS 25 | PS 25 | PS 25 |
42 | Motor vehicle transportation | Y | PS 25 | PS 25 | PS 25 |
43 | Aircraft transportation | Y | PS 25 | PS 25 | PS 25 |
44 | Marine craft transportation | Y | PS 25 | PS 25 | PS 25 |
45 | Highway and street right-of-way | Y | PS 25 | PS 25 | PS 25 |
46 | Automobile parking | Y | Y | Y | Y |
47 | Communications | Y | PS 25 | PS 25 | N |
48 | Utilities | Y | Y | Y | Y |
49 | Other transportation communications and utilities | Y | PS 25 | PS 25 | N |
50 | Trade | ||||
51 | Wholesale trade | Y | PS 25 | PS 30 | PS 30 |
52 | Retail trade - building materials, hardware and farm equipment | Y | PS 25 | PS 30 | PS 30 |
53 | Retail trade - general merchandise | Y | PS 25 | PS 30 | N |
54 | Retail trade - food | Y N | PS 25 | PS 30 | N |
55 | Retail trade - automotive, marine craft, aircraft and accessories | Y | PS 25 | PS 30 | N |
56 | Retail trade - apparel and accessories | Y N | PS 25 | PS 30 | N |
57 | Retail trade - furniture, home furnishings and equipment | Y | PS 25 | PS 30 | N |
58 | Retail trade - eating and drinking establishments | Y N | PS 25 | PS 30 | N |
59 | Other retail trade | Y N | PS 25 | PS 30 | N |
60 | Services | ||||
61 | Finance, insurance and real estate services | Y | PS 25 | PS 30 | N |
62 | Personal services | Y | PS 25 | PS 30 | N |
62.4 | Cemeteries | Y | PS 25 | PS 30 | N |
63 | Business services | Y | PS 25 | PS 30 | N |
64 | Repair services | Y | PS 25 | PS 30 | PS 30 |
65 | Professional services | Y | PS 25 | PS 30 | PS 30 |
65.1 | Hospitals, nursing homes | PS 25 | PS 30 | N | N |
65.1 | Other medical facilities | PS 25 | PS 30 | PS 30 | N |
66 | Contract construction services | Y | PS 25 | PS 30 | N |
67 | Governmental services | Y | PS 25 | PS 30 | N |
68 | Educational services | PS 25 | PS 30 | N | N |
69 | Miscellaneous services | Y | PS 25 | PS 30 | N |
70 | Cultural, entertainment and recreational | ||||
71 | Cultural activities (including churches) | PS 25 | PS 30 | N | N |
71.2 | Nature exhibits | Y | N | N | N |
72 | Public assembly | Y | N | N | N |
72.1 | Auditoriums, concert halls | PS 25 | PS 30 | N | N |
72.11 | Outdoor music shell, amphitheaters | N | N | N | N |
72.2 | Outdoor sport arenas, spectator sports | Y | Y | N | N |
73 | Amusements | Y | Y | N | N |
74 | Recreational activities (including golf courses, riding stables, water recreation) | Y | PS 25 | PS 30 | N |
75 | Resorts and group camps | Y | Y | N | N |
76 | Parks | Y | Y | N | N |
79 | Other cultural, entertainment and recreation | Y | Y | N | N |
80 | Resources production and extraction | ||||
81 | Agriculture (except livestock) | Y | Y | Y | N |
81.5—81.7 | Livestock farming and animal breeding | Y | Y | Y | N |
82 | Agricultural related activities | Y | Y | Y | N |
83 | Forestry activities and related services | Y | Y | Y | N |
84 | Fishing activities and related services | Y | Y | Y | Y |
85 | Mining activities and related services | Y | Y | Y | Y |
89 | Other resources production and extraction | Y | Y | Y | Y |
(Prior Code, § 158.397) (Ord. 3718, passed 6-20-2011)
§ 157.398 ATTENUATION.
(A) Minimum noise attenuation requirements and standards. Where a particular structure contains different occupancy uses, the more stringent requirements shall apply, except where it is architecturally possible to achieve the appropriate noise level reduction for each different use and the uses are acoustically separated by a wall or partition with a minimum STC of 25.
(B) Compliance use above minimum. In any instance where noise level reduction is required by this chapter, all plans and specifications are to be certified by a recognized acoustical specialist for compliance.
(C) Noise reduction.
(1) Buildings, structures and active outdoor recreation space shall be located at the greatest distance from the noise source, taking maximum advantage of existing topographical features to minimize noise impacts and within zoning district requirements such as required setbacks.
(2) Buildings and structures shall be oriented to minimize exposure to the noise source and building openings, such as windows, shall be located away from the noise source. The amount of passive outdoor recreational space where individuals would be subject to noticeable or severe levels of noise should be minimized. Landscaping materials should be used to deflect noise. Noise attenuation shall be accomplished as follows.
(a) All mechanical ventilation systems shall provide the minimum air circulation and fresh air supply requirements as provided in the Building Code for the proposed occupancy without the need to open any exterior doors or windows.
(b) The perimeter of all exterior windows and door frames shall be sealed air-tight to the exterior wall construction.
(c) Fireplaces shall be equipped with well-fitted chimney cap devices.
(d) All ventilation ducts, except range hoods, connecting interior space to outdoors shall be provided with a bend such that no direct line of sight exists from exterior to interior through the vent duct.
(e) Doors and windows shall be constructed so they are close-fitting. Weather- stripping seals shall be incorporated to eliminate all edge gaps.
(f) All penetration through exterior walls by pipes, ducts, conduits and the like shall be caulked air-tight to the exterior construction.
(D) Existing residences. Any existing residence may be added to, structurally altered or repaired without conforming to the referenced specifications provided the property owner signs a waiver indicating notification of said specifications and provided that all generally applicable requirements of the Building Code are complied with.
(Prior Code, § 158.398) (Ord. 3718, passed 6-20-2011)