Ord 440 Amend Code Title 12 Aircraft Noise AttenuationCITY OF MENDOTA HEIGHTS
DAKOTA COUNTY, MINNESOTA
ORDINANCE NO. 440
AN ORDINANCE AMENDING TITLE 12, CHAPTER 4
OF THE CITY CODE PERTAINING TO AIRCRAFT NOISE ATTENUATION
The City Council of the City of Mendota Heights, Minnesota ordains as follows:
SECTION 1: City Code Title 12 Chapter 4 is hereby amended as follows:
SECTION 2 AMENDMENT: 12 -4 -3: DEFINITIONS:
DNL: The day -night sound level, or the twenty four (24) hour equivalent continuous sound level (time
averaged A- weighted sound level) from midnight to midnight, obtained after the addition of ten (10)
dBA to sound levels measured from ten o'clock (10:00) P.M. to seven o'clock (7:00) A.M.
SECTION 3 AMENDMENT: 12 -4 -6: ACTUAL CONTOURS AS PUBLISED IN THE MAC ANNUAL NOISE
CONTOUR ANALYSIS ADOPTED:
A. The Metropolitan Airport Commission publishes a map of actual noise contours annually as a part of
their noise contour analysis. The preceding year's actual noise contour map shall be used to determine
the DNL for application of noise attenuation standards. The MAC Annual Noise Contour Analysis is
maintained by the Metropolitan Airport Commission.
SECTION 4 AMENDMENT: 12 -4 -7: NOISE COMPATIBILITY TABLES:
All construction or reconstruction requiring a building permit and located within a designated DNL
contour shall be constructed in such a way that the applicable noise level reduction requirements
contained in the following noise compatibility tables are met or exceeded. Where a particular structure
contains different land uses, the more stringent requirements of the applicable table shall apply, except
where it is architecturally possible to achieve the appropriate noise reduction level for each different
use, and the uses are acoustically separated by a wall or partition with a minimum STC of twenty five
(25). (Ord. 232, 5 -19 -1987)
NOISE COMPATIBILITY TABLE 1
Noise Reduction Level In dBA Required To Meet Standards For Use In New
Development And Major Redevelopment
(The noise reduction level numbers specify for each type of land use the amount of interior sound level
reduction necessary for the use to be compatible in the applicable mitigated noise contour.)
Land Use Type
Actual Noise Contour
Residential:
Single /multiplex with individual
entrance
Multiplex /apartment with shared
entrance1
Mobile home
INCO 35 30 25
INCO INCO INCO 25
Educational and medical:
Schools,
nursing homes
churches, hospitals,
NCO INCO INCO 25
Cultural, entertainment, recreational
35 30 25 20
Office, commercial retail
35 30 25 CNST
Services:
r^
Transportation /passenger facilities
Transient lodging
Other medical,
educational services
health and
35 30 25 CNST
INCO I 30 25 20
35 30 25 CNST
Other services
Industrial, communication, utility
Agricultural land, water area, resource extraction
35 30 i 25 CNST
25 CNST CNST j CNST
CNST CNST CNST CNST
Note:
1.These uses do not permit "in the wall" air conditioning units in in noise contours 71 or above.
NOISE COMPATIBILITY TABLE 2
Noise Reduction Level In dBA To Meet Standard For Use In Infill Development And
Reconstruction Or Additions To Existing Structures
(The noise reduction level numbers specify for each type of land use the amount of interior sound level
reduction necessary for the use to be compatible in the applicable mitigated noise contour.)
Land Use Type
Actual Noise Contour
Residentiall:
Single /multiplex with individual
entrance2
Leq(81 +)
40
Multiplex /apartment
entrance2
Mobile home2
with shared 40
40
Educational and medical:
Schools,
nursing homes
churches,
hospitals,
40
Cultural, entertainment, recreational
35
ri
Office, commercial retail
35
Services:
Transportation /passenger facilities 35
Transient lodging
35
Other medical, health and 35
educational services
Other services
35
ndustrial, communication, utility
25
Agricultural land, water area, resource extraction
CNST
35 30 25
35 30 25
35 30 25
30 25 1 20
30 25 ! CNST
30 25 ! CNST
30 25 20
30 25 CNST
30 25 CNST
CNST CNST CNST
CNST CNST CNST
Notes:
1. Does not apply to remodeling or rehabilitation of existing residential structures, or to construction
of appurtenances to existing residential structures.
2. These uses do not permit "in the wall" air conditioning units in in noise contours 71 or above.
SECTION 5 EFFECTIVE DATE: This Ordinance shall be in full force and effect from and after its
summary publication according to law.
Adopted and ordained into an Ordinance this sixth day of December 2011.
Attest:
Sandie Thone, City Clerk
CITY COUNCIL
%1TY OF M ND
Sandra Krebsbach, M