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Public notices, May 24, 2014

May 24, 2014
The Journal

PUBLISH

(May 24, 2014)

ORDINANCE NO. 14

-117 FOURTH

SERIES

CITY OF NEW ULM,

BROWN COUNTY

MINNESOTA

AN ORDINANCE

AMENDING SECTION

9.12 OF THE CITY

CODE OF THE CITY

OF NEW ULM RELA-

TIVE TO NOISE

STANDARDS IN SAID

CITY.

BE IT ORDAINED BY

THE CITY COUNCIL

OF THE CITY OF

NEW ULM:

SECTION 1. That

Subdivision 8( B)( 2) of

Section 9.12 of the

City Code of the City

of New Ulm is hereby

amended to read as

follows:

B. Standards.

2. Noise. These stan-

dards describe the lim-

iting levels of sound

and are established on

the basis of present

knowledge for the

preservation of public

health and welfare.

These standards are

consistent with

speech, sleep, annoy-

ance, and hearing con-

servation requirements

for receivers within the

District. These stan-

dards do not, by them-

selves, identify the

limiting levels of impul-

sive noise needed for

the preservation of

public health and wel-

fare.

a. Definitions. The

terms used in this

Subdivision have the

meanings given them

in this part.

i. "A- weighted" means

a specific weighting of

the sound pressure

level for the purpose of

determining the human

response to sound.

The specific weighting

characteristics and

tolerances are those

given in American Na-

tional Standards Insti-

tute S1.4 -1983, sec-

tion 5.1 as now in

force or as hereafter

amended, revised, or

replaced by Minnesota

Rules Chapter 7030.

ii. "dB(A)" means a unit

of sound level ex-

pressed in decibels

(dB) and Aweighted.

iii. "Decibel" means a

unit of sound pressure

level, abbreviated as

dB.

iv. "Impulsive noise"

means either a single

sound pressure peak

(with either a rise time

less than 200 mil-

liseconds or total dura-

tion less than 200 mil-

liseconds) or multiple

sound pressure peaks

(with either rise times

less than 200 mil-

liseconds or total dura-

tion less than 200 mil-

liseconds) spaced at

least by 200 mil-

lisecond pauses.

v. "L10" means the

sound level, expressed

in dB(A), which is ex-

ceeded ten percent of

the time for a one hour

survey.

vi. "L50" means the

sound level, expressed

in dB(A), which is ex-

ceeded 50 percent of

the time for a one hour

survey.

vii. 'Person" means

any human being, any

municipality or other

governmental or politi-

cal subdivision or other

public department or

agency, any public or

private corporation,

any partnership, firm,

association, or other

organization, any em-

ployee, licensee, re-

ceiver, trustee, assig-

nee, agency, legal en-

tity, other than a court

of law, or any legal

representative of any

of the foregoing.

viii. "Sound pressure

level', in decibels,

means 20 times the

logarithm to the base

10 of the ratio of the

pressure to the refer-

ence pressure. The

reference pressure

shall be 20 micronew-

tons per square meter.

b. No persons shall

operate or cause or

permit to be operated

any source of noise in

such a manner as to

create a noise level

exceeding the follow-

ing limits:

L50

75

L10

80

c. The following pro-

cedures must be used

to obtain representa-

tive sound level meas-

urements:

i. Measurement of

sound must be made

at the point of human

activity which is

nearest to the noise

source. All measure-

ments shall be made

outdoors.

ii. All sound level

measuring devices

must meet Type O, I,

II, or S specifications

under American Na-

tional Standards Insti-

tute S1.4 -1983 as

now in force or as

hereafter amended, re-

vised, or replaced by

Minnesota Rules

Chapter 7030.

iii. All sound level

measuring devices

must, at a minimum,

be externally field cali-

brated before and after

monitoring using a cali-

bration device of

known frequency and

sound pressure level.

iv. Measurements

must be made at least

three feet off the

ground or surface and

away from natural or

artificial structures

which would prevent

an accurate measure-

ment.

v. Measurements

must be made using

the A-weighting and

fast response charac-

teristics of the sound

measuring device as

specified in American

National Standards In-

stitute 51.4-1983 as

now in force or as

hereafter amended, re-

vised, or replaced by

Minnesota Rules

Chapter 7030.

vi. Measurements

must not be made in

sustained winds or in

precipitation which

results in a difference

of less than ten deci-

bels between the

background noise leve-

land the noise source

being measured.

vii. Measurements

must be made using a

microphone which is

protected from am-

bient conditions which

would prevent an ac-

curate measurement.

d. A summary sheet

for all sound level

measurements shall

be completed and-

signed by the person

making the measure-

ments. At a minimum,

the summary sheet

shall include:

i. date;

ii. time;

iii. location;

iv. noise source;

v. wind speed and

direction;

vi. temperature;

vii. humidity;

viii. make, model, and

serial number of

measuring equipment;

ix. field calibration

results;

x. monitored levels;

and

xi. site sketch indi-

cating noise source,

measurement location,

directions, distances,

and obstructions.

SECTION II. That this

ordinance shall take

effect and shall be in

force 30 days from

and after its adoption,

approval, and publica-

tion.

Adopted by the City

Council of the City of

New Ulm this 20th day

of May, 2014.

Charles Schmitz

President of the City

Council

Attest:

Reginald K. Vorwerk

Finance Director

Approved by the May-

or of the City of New

Ulm this 20th day of

May, 2014

Robert Beussman

Mayor

 
 

 

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