77-01 - Noise Ordinance ZOA pt 1SQ...�
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LARS01V & ME RTZ, LTD. // 7
ATTORNEYS AT LAW
1900 FIRST NATIONAL BANK BUILDING
MINNEAPOLIS, MINNESOTA 55402
RUSSELL H. LARSON TELEPHONE
CRAIG M. MERTZ
(612) 335-9565
OF COUNSEL December 8, 1977
HARVEY E.SKAAR
Mr. Donald W. Ashworth.
Chanhassen City Manager
Sox 147
Chanhassen, MN 55317
Re: Noise Ordinance
V\ Dear Don:
vv) Attached is the final draft of Ordinance 47-1, whereby the
zoning ordinance is amended to add the PCA noise standards as
§19.20, and repealing the noise standards under Subsection 1
of §12.07.
This amendment is pursuant to the Council action of December 5,
1977, and a second reading and passage of the ordinance is
recommended.
RHL:mep_
Enc1.
Very trul�ours,
r
RUSSELL H. LARSON
Chanhassen City Attorney
N DEC,1911
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CHANHASSEN
7610 LAREDO DRIVE•P.0 BOX 147*CHANHASSEN, MINNESOTA 55317
(612) 474-8886
MEMORANDUMC€!w?;
TO: Mayor and City Council Rejected
FROM: City Manager, Don Ashworth
DATE: November 21, 1977
SUBJ: Noise Ordinance, Adopt PCA Standards, 1st Reading
This item was placed on the November 7th agenda. The city council
acted to delete it from the consent agenda and asked that such be
placed as a regular agenda item.
2.
CITY OF �
CHANHASSEN s
7610 LAREDO DRIVE+P.O BOX 1479CHANHASSEN, MINNESOTA 55317
(612) 474-8885
PLANNING REPORT
DATE: October 31, 1977
TO: Mayor and City Council
FROM: Bruce Pankonin, City Planner
SUBJ: Minnesota Pollution Control Agency Noise Standards (MPCA)
Background
1. Pursuant to city council request, Chanhassen planning commission
duly held a public hearing on September 14, 1977, to consider amending
the Chanhassen zoning ordinance to include the Minnesota Pollution
Control Agency's noise pollution standards. Said noise standards
are made part of this report and included as attachment a. Minutes
of the public hearing to consider amending the zoning ordinance are
included as attachment b.
Planner's Comments
1. The existing MPCA noise standards have the force of law within
the city of Chanhassen. By Chanhassen amending it's zoning ordinance
to include the MPCA standards, would cause Chanhassen to be the
administrative enforcing unit rather than the MPCA.
As shown in attachment c, the planning commission invited a noise
expert to explain the MPCA standards.
3. If the city council adopts the MPCA noise standards, staff would
recommend the council allocate between $300 to $600 to purchase a noise
meter for enforcement purposes. Further, staff would recommend the
city council allocate sufficient staff time to train individuals in
enforcement of the MPCA noise standards.
Planning Commission Recommendation
As shown in attachment c, the planning commission recommended the
city council amend city ordinance 47, Section 12.7 by incorporating
the MPCA noise standards by reference.
Staff Recommendation
Staff concurs with the Planning Commission recommendati
RIISSELL H. LARSON
ATTORNEY AT LAW
1900 FIRST NATIONAL BANK BUILDING
MINNEAPOLIS, MINNESOTA 55402
RUSSELL H. LARSON �7
CRAIG M. MERTZ July 19, 1977
7
Mr. Donald W. Ashworth
Chanhassen City Manager
Box 147
Chanhassen, Minnesota 55317
Re: Noise Ordinance
Dear Don:
'k ��
AREA CODE 612
TELEPHONE 335-9565
Ref: Zoning Amendments
A
it C' VVC
A_ -
Our initial draft of proposed Ordinance No. 47-1 should be changed
to read as shown on the attached revised draft.
You may also wish to consider that the noise regulations be made
applicable to all public bodies of water which lie wholly or
partially within the City. In such case, the last sentence of
Section 19.20 should read:
"Said rules, regulations and standards shall be
applicable to all zoning districts within the City
of Chanhassen, including all public bodies of water
which lie wholly or partially therein; and all of
said rules, regulations and standards are hereby
referred to, adopted, incorporated by reference, and
made a part hereof as though fully set forth in this
ordinance."
er trul urs,
RUSSELL H. LARSON
Chanhassen City Attorney
RHL:mep
Encl.
cc: Bruce Pankonin, City Planner
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NPC 1 D"'WOons� Severability and Variances for Noise Pollution Control
Regulations
(a) Definitions. f"ur the purpose of all nuisc pollution control regulations:
(1) Agency. Agency means the Minnesota Pollution Control Agency,
its agent, or representative.
(2) ANSI. ANSI means the American National Standards Institute or
its successor bodies.
(3) Director. Director means the Executive Director of the Minnesota
Pollution Control Agency.
(4) Daytirne Hours. Daytime hours are those from 7:00 a.m. to 10:00
P.M. (0700-2200).
(5) Nighttltne Hours. Nighttime hours are those from 10:00 p.m, to
7:00 a.m. (2200-0700).
(6) Person. Person means any human being, an municipality or other
governmental or political subdivision, or any other public agency, any public
or private corporation, any partnership, firth, association or other organixa_
tion, any receiver trustee, assignee, agent or other legal representative of any
of the foregoing, or any other legal entity, but does nut include the Minne-
sota Pollution Control Agency.
(7) SLUCM. SLUCM means
(1969, the Standard Land Use Coding Manual
United States Government Printing Oflice) which designates land
activities by means of numerical codes.
(8) Side v Sound is an oscillation in pressure, stress, particle displace-
ment, particle veloci►y, ctc., in an elastic or partially elastic medium, or the
superposition of such propagated alterations.
(9) Noise. Noise means any sound not occurring in the natural en-
vironment, including, but not limited to, sounds emanating from aircraft
and highways, and industrial, commercial and residential sources.
(10) Impulsive Noise. Either a single sound pressure peak (with
either a rise (inic less than 200 milliseconds or total duration less than 200
milliseconds) or multiple sound pressure peaks (with either rise times less
than 200 milliseconds or total duration less than 200 milliseconds) spaced
at least by 200 millisecond pauses.
0 1) Nun -Impulsive Noise. All noise not included in the definition of
Impulsive Noise.
dB. (12) Decibel. Decibel is a unit of sound pressure level, abbreviated
(13) Sound Pressure Level (SPL). Sound Pressure Level is 20 times
the logarithm to the base to the refcl0 of the ratio of the pressure of a sound, p,
rence pressure, p,. Fur the purposes of these regulations, the
reference pressure shall be 20 micronewtons per square meter (20 µN/m').
In equation form, Sound Pressure Level in units of decibels is expressed as:
SPL (dB) = 20 lug„ p/p�
(14) dBA. dBA is �a unit of sound level. dBA is the weighted sound
pressure level by the use of the A metering characteristic and weighting as
specified in ANSI Specification for Sound Level Meters, S1.4 - 1971, which
is hereby incorporated by reference. For the purpose of these regulations,
dBA is used as a measure of human response to sound.
to dDA, which is exceeded
and level, expressed oasured by test procedures
(IS) LLo• Lw is the so one hour survey' ss m
ten percent of the time for a which is exceeded
approved by the Director• ex pressed in dBA, test proce-
one hour survey, as Measured by
015) L.. 1-w ►s the sound level, p
fifty percent of the tithe fora the application
dares it by the Director. of any feguIation °r such invalid►ty
if any Provision the provisions
(b) severabRity• lica11°!'� and to this end
to any person or c►r ► or pp s ►� held tOt be invalid,
declared to be
thereof provisionapplications
shall not �ilationsllecl hand the various ct�n
Of all re6 p stances
severable. l►catton of th�ionaloc►rcumgible p
(c) 'Variance. Whereupon writteb apeason of excep would cause
Agency findrthat ovisions of any np1Be Tegttlaotunder
or persons, the writh any P impractical or upon
such ►conditions
strict conform►tY would be unreasonaer ivariance up or the prevcntion,
undue hardship, ency, may p may prescribe a intent of the
the circutrtstanccs°time tile 1 mitatto0s asi I ►n harmony
vutth
and within such Of Haws
control Oran ab
atement pcdera
State and y
2
is
NPC 2 Noise Standards
(a) These standards describe the limiting levels of sound established on
the basis of present knowledge for the preservation of public health and
welfare. These standards are consistent with speech, sleep, annoyance and
herrin$ conservation requirements for receivers within areas grouped
according to land activities by the Noise Area Classiflcation (NAC) system
herein described. However, these standards do not, by themselves, identify
the limiting levels of impulsive noise needed for the preservation of public
health and welfare.
(b) Noise Standards
Day (0700-2200) Night (2200-0700)
NAC L., L
1 60 65 SO 55-
2 65 70 65 70
( Not�33 75 80 75 80
Area Claitiilicalion System According to Land Activity at Re-
ceiver. Acceptable sound levels for the receiver are a function of the in-
tended activity in that land area. The following noise area classifications
are grouped and defined by the SLUCM numerical codes and descriptions.
(d) Noise Area Classilieu[ion-I (NAC-1) includes the following land ac-
tivities:
NAC-i
11 Household units (includes farm houses)
12 Group quarters
13 Residential hotels
14 Mobile home parks or courts
15 Transient lodgings
19 Other residential, NEC*
397 Motion picture production
651 Medical and other health services
674 Correctional institutions
68 Educational services
691 Religious activities
71 Cultural activities and nature exhibitions
721 Entertainment assembly
7491 C'amping and picnicking areas (designated)
75 Resorts and group camps
79 Other cultural, entertainment, and recreational activities, NEC
(e) Noise Area Classification-2 (NAC-2) includes the following land activi-
ties:
NAC-2
4113 Railroad terminals (passenger)
4115 Railroad terminals (passenger and freight)
4122 Rapid rail transit and street railway passenger terminals
4211 Bus passenger terminals (intercity)
4212 Bus passenger terminals (local)
*NEC --- Not otaewhere Coded.
4
4213 Bus passenger terminals (intercity and local)
429 Other motor vehicle transportation, NEC
4312 Airport and flying field terminals (passenger)
4314 Airport and flying field terminals (passenger and freight)
4411 Marine terminals (passenger)
4413 Marine terminals (passenger and freight)
46 Automobile parking
4721 Telegraph message centers
492 Transportution services and arrangements
51 Wholesale trade
52 Retail trade — building materials, hardware, and farm equipment
53 Retail trade — general merchandise
54 Retail trade —food
55 Retail trade — automotive, marine craft, aircraft, and accessories
56 Retail trade -- apparel and accessories
57 Retail trade -- furniture, home furnishings, and equipment
58 Retail trade — eating and drinking
59 Other retail trade, NEC
61 Finance, insurance and real estate services
62 Personal services
63 Business services
64 Repair services
652 Legal services
659 Other professional services, NEC
66 Contract construction services
67 Governmental services (except 674)
69 Miscellaneous services (except 691)
72 Public assembly (except 721, 7223)
73 Amusements (except 731)
74 Recreational activities (except 7491)
76 parks
(f) Noise Area Classification-3 (NAC-3) includes the following land activi-
ties:
NAC-3
21 Food and kindred products — manufacturing
22 Textile mill products — manufacturing
23 Apparel and other finished products made from fabrics, leather,
and similar materials -- manufacturing
24 Lumber and wood products (except furniture) — manufacturing
25 Furniture and fixtures — manufacturing
26 Paper and allied products --- manufacturing
27 Printing, publishing and allied industries
28 Chemicals and allied products -- manufacturing
29 Petroleum refining and related industries
31 Rubber and miscellaneous plastic products — manufacturing
32 Stone, clay, and glass products - manufacturing
33 Primary metal industries
34 fabricated metal products --- manufacturing
35 Professional, scientific, and controlling instruments; photographic
and optical goods; watches and clocks -- manufacturing
39 Miscellaneous manufacturing, NEC (except 397)
41 Railroad, rapid rail transit, and street railway transportation (ex-
cept 4113, 4115, 4122)
42 Motor vehicle transportation (except 4211, 4212, 4213, 429)
43 Aircraft transportation (except 4312, 4314)
44 Marine craft transportation (except 4411, 4413)
45 Highway and street right-of-way
47 Communication (except 4721)
48 Utilities
49 Other transportation, communication and utilities, NEC (except
492)
7223 Race tracks
731 fairgrounds and amusement parks
81 Agriculture
82 Agricultural and related activities
83 Forestry activities and related services (including commercial
forest land, timber production and other related activities)
84 1-fishing activities and related services
85 Mining activities and related services
89 Outer resource production and extraction, NEC
— All other activities
(g) Noise Area C1assification-4 (NAC-4) includes the following land activi-
ties:
NAC-4
91 U"Llcveloped and unused land area (excluding non-commercial
forest development)
92 Nun -commercial forest development
93 Water areas
94 Vacant floor area
95 Uoder construction
99 Other undeveloped land and water areas, NEC
(h) Measurement Procedure, A measurement procedure approved by the
Director shall be used to determine the acceptability of sound levels in a
viven area. Such measurements shall be made at the point of human activity
in the receiving area which is nearest the noise source and which is typical
for the Noise Arco (:fassilication category of the receiving area, except where
existing ban wrs, obstructions or reflecting surfaces prevent an accurwe
measurement. All measurements shall he made outdoors.
0) Exceptions
(1) The Standards of NAC-2 may applyy to buildings within the follow-
ing NAC-1 categories: 11, 12, 13, 14, 15, 19, 3970 651, 68, 691, 71, 721, if
all of the following conditions are met:
(i) "The building is constructed and insulated in such a way as to
assure that the exterior -interior sound level attentuation, measured under a
measurement procedure approved by the Director, is at least 30 d13A; and
(ii) The building possesses year -around indoor climate control; and
(iii) The building has no facilities intended for outdoor activities, in-
cluding but not limited to yards, swimming pools, patios, balconies, tennis
courts, golf course, gardens and picnic areas.
(2) The NAC-1 DaoStandards me apply to land urea in NAC-1 cate-
gories during nighttime hurs in lieu of NAC-1 Night Standards if such land
uses are not intender! for overnight sleeping.
a
CiIonowT
REGULAR PLANNING COMMISSION MEETING SEPTEMBER 14, 1977
Mal MacAlpine called the meeting to order at 7:30 p.m. with the
following members present: Jerry Neher, Walter Thompson, Hud Hollenback,
Les Bridger, Roman Roos, and Dick Dutcher.
ee
PUBLIC HEARING
MINNESOTA POLLUTION CONTROL AGENCY'S NOISE STANDARDS
The Chairman called the public hearing to order. No one from the public
was present. The official notice was published in the Carver County
Herald.
Staff recommended that these standards be adopted by reference and the
Zoning Ordinance be amended to include these standards.
Bob Waibel - The existing PCA Noise Standards have the force of law
within the City. We simply want to have Chanhassen be the administrative
enforcing unit rather than PCA.
It was decided to invite a representative from the PCA to appear before
the Planning Commission to explain the standards prior to Planning
Commission action.
Hud Hollenback moved to close the public hearing. Motion seconded by
Walter Thompson and unanimously approved. Hearing closed at 7:50 p.m.
MUTES: Dick Dutcher moved to approve the August 10, 1977, Planni
Co ssion minutes as written. Motion seconded by Hud Hollenback,,/
foll ing voted in favor: Hud Hollenback, Dick Dutcher, Jerry Neher,
Les Br er, Roman Roos, and Walter Thompson. Mal MacAlpine abstained.
Motion carried.
R-lB REZONING: The Planning Commission received one letter in
oppos t on to t
to
rezoning. The Planning Commission',held a public hearinc
on August 10 c sider rezoning a portion of Carytr Beach, Red Cedar
Point, Shore Acres, nd St. Hubertus from R-1 to,-R-1B.
Bruce Pankonin - Since the public hearing I undertook a study to
determine if existing platted lots are in conformity with existing
zoning regulations. This sthqy analyzed all subdivisions in the City
and reveals that not only is S Hubertus, Shore Acres, Carver Beach,
and Red Cedar Point substandard but the vast majority of Chanhassen
Estates is non -conforming; all Sc:holer's Addition does not comply
along with Highland, Western Hills First; Minnewashta Heights,
Minnewashta Manor, and Minnewashta Shores for the most part are non-
conforming. It's interesting in that four of the seven Planning
Commission members live on substandard lots.- The problem is farther
reaching than we anticipated. I think these`hople have vested rights
in the piece of property that they bought and t y shouldn't be
restricted to a npmber of bureaucratic encumberances when a building
permit is requested. However, I think if they were ing to utilize
a lot for purses for which it is prevently zoned he ould adhere to
the setbacYprovisions of todays standards. What staff $ saying, let's
forget a ut the R-IB right now because the problem is fartlier
reachihan anticipated, let's make a blanket statement in the ordinancE
so i "we have a platted lot of record it shall be determined buildable
pr ided it has frontage on a public:street•and said space
equirements for the district for which it is located or a platted i.ot
0,41
Ci
REGULAR PLANNING COMmiSSION MEETING OCTOBER 12, 1977
PUBLIC HEARING
AMENDMENT TO ORDINANCE 47'
EXPANSION OF LOT LIMITATIONS
ick Dutcher called the public hearing to order at 7:40 p.m. with the following members
p sent: Roman Roos, Hud Hollenback, Jerry Neher, and Walter Thompson. Mal MacAlpine
an Les Bridger were absent. Russell Larson, Bob Waibel, Bruce Pankonin, and Mayor
Hobbs were present.
Bruce Pankonin - This proposed amendment says that if you had a legally platted lot,
and if you met 50% of todays requirements and you fronted on a street your could use
it for sing family dwelling purposes provided sanitary sewer and water was
installed an ssessed and the structure to be put on the lot meets the setbacks.
You would just et a building permit. If you need other considerations in terms
of setbacks, etc. you would have to go through the variance procedure.
Dick Dutcher - A lot: of people get very excited about small loC/size. I have seen
small lot sizes work very well for residential development. /I think the key is
the amount of open spat that is available within a given area, let's say a
neighborhood. Where yo 'have a situation like Carver Be�.4 and Red Cedar Point
I would think that since Tt's a problem and it's going�o be a problem and short
of urban renewal that maybe the best tack for the city,�to take would be to try to
preserve as much open space adjacent to or near those'areas as we possibly can so
that there is a reasonable amou t of open space fo .ithe people in those areas to
use. We have talked about theses mall lot sizes `ver and over again. The problems
in Red Cedar Point. The problems n Carver Be I think if there were
reasonable review, architectural or�ther kin of review, so that the people
when they built homes in those areas Nren't cutting off their next door neighbors
light or a reasonable amount of air or h have you, that they weren't building
shacks. We wouldn't end up with that ba 'a development even though it's something
that we have inherited from the past a►}, 1 's going to be difficult to work with,
in the long range it's going to be an/rasset',to the community.
Mayor Hobbs - In listening to your discussion these small lots the first thing
that comes to mind when we thin of a 6, 7, or OOO square foot lot, a row of
houses in Minneapolis or St. P 1 are all the same; you get out here and for many,
many years 15,000 square fee front yard, side yard.setbacks, the individual had
enough space to do most any ing he wanted to within that lot without having that
much effect on the neighb Xs on either side. You get Itn,to a situation like the
Council faced on this variance in Red Cedar Point where �e request was setback,
side yard se/Im
,thing and all of a sudden the conce..n from the neighbors
didn't deal act that they didn't think that per!
set be able to
set back a off the lot line, it was the structure�jo be put on it
and how it wt other structures around it. I think tr'+at becomes more
increasingly with smaller lots. Strong arguments were' -made that you
cannot use te request to dictate to the person what styi'e�of househe
puts on the
Walter Thompson moved to close the public hearing. Motion seconded by' 17
an Roos
and unanimously approved. Hearing closed at 8:1.5 p.m.
MIN E'J;: Hud Hollenback moved to approve the September.28, 1977, Planning Commission
m utes. Motion seconded by Jerry Neher and.unanimously approved.
MINNESOTA POLLUTION CONTROL,�AGENCY NOISE STANDARDS: Al Perez from the MPCA was
preen n urge a annirig dmm�ss on ::o' recur mend' apprnyal of the poise
ordinance`.
~Regular Planning Commission Meeting October 12, 1977 -2-
He brought a sound level meter for members to view. This type of equipment would
cost from $300 to $600. There are programs for loaning equipment through the
federal government which he felt the city should investigate. The MPCA does have
meters they will loan for a few days at a time. MPCA hold workshops twice a year
to familiarize persons with sound level meters, how to calibrate them, etc.
They will also train people at any time.
Hud Hollenback moved to recommend the City Council consider incorporating by
reference the Minnesota PCA Noise Standards into Ordinance 47 and amend the noise
standards in Section 12.7. Motion seconded by Jerry Neher and unanimously
approved.
MENDMENT TO ORDINANCE 47, ZONING LOT LIMITATIONS: Hud Hollenback moved Yo
rXrommend t e City Council consider amending 0rdinance 47, Section 19.15 to read
as llows:
1. ly one principal structure shall be permitted on each zoninVlbe
t.
2. A platted lot of record in the office of the Register of DeedRegistrar
of Titles of Carver County on or before February 8, 1972, sh deemed a
buildable lot provided sanitary sewer and water are in p1aZ7and assessed
and it has frontage on a public right-of-way and frontage.. nd area
requirements for the district in which it is located or, djusted to
conform as follows:
A platted lot of record in the office of the Register of Deeds or
Registrar o"Fjitles on or before February 8, 102, which is in an
"R" district and which does not meet the requirements of this
ordinance as to area or frontage, may be utilized for single family
detached dwelling purposes provided the measurements of such area,
frontage or open space are within 50% of the requirements of this
ordinance and sanitary sewer is in place and assessed to the platted
lot of record, and the principal struyrcture which is proposed to be
constructed on the platted lot of record shall conform to all
setback requirements of the district in which the platted lot of
record is located.
Motion seconded by Jerry Neher and un imously approved.
SUBDIVISION REQUEST DAVID LARSON The City Planner recommended that proposed
Lot 3 ave the minimum 90 feet o fronta e en Pleasant View Road and further
that the Planning Commission h d a public hearing to test neighborhood sentiment.
Mr. Larson has revised the pr osed plat to r ect the requested frontage.
Roman Roos moved to hold a public hearing on November 9, 1977, at 8:15 p.m. to
consider the subdivision request for David Larson. "*otion seconded by Hud
Hollenback and unanimoysly approved.
SUBDIVISION RE UEST - HERBERT BLOOMBERG: Mr. Bloomberg was present seeking
approvaT to su i e his property on t e east side of Colonial Grove into 30
single family 1 s and one common outlot. Sewer and water are in place to the
property. A11 he lots to be created meet or exceed the minimum requirements
of Ordinance 7 except for Lot 5, Block 1. This lot has to be 75 feet wide
pursuant t the Shoreland Ordinance, and Lot 4, Block 3 does not have sufficient
buildabl area when all side yard and rear yard setbacks are conside d.
con/
on of this lot would equalize the lot area in Lots 2, 3, 5, and 7.
Lot 4 s proposed as a common outlot afct4°is allowed upon the issuance o
con ' ional use permit. The City Planner feels the proposed subdivision n
is n conformance with the city{s plan for land use, transportation, and zo ng
ovided it is changed to reflect the above items.
CITY OF
CHANHASSEN
7610 LAREDO DRIVEOP.O. BOX 1479CHANHASSEN, MINNESOTA 55317
(612) 474-8885
MEMORANDUM
DATE: October 6, 1977
TO: Planning Commission
FROM: Bob Waibel, Assistant City Planner
SUBJ: Noise Ordinances
The following materials have been furnished by Commissioner
Walter Thompson for your consideration.
0
1
-
/'� EN-0018
pa-i8,74
A.
Sht' #:1.
EN-0018: SOUND LEVELS & NOISE, t:
1 , Sound levels and Noise Po'Ilu, ,i ;are. o_f increasing cancerrr
in G.R.C.6 act;ivities..t `'�nfgt•o�ement .of OSHA provisions
and varioue environmental.regtulati°ons .wi`11 intensify this: .
concern in the future.
2. Much is writtep on this subJoet,but three useful references
for G.R.C. people 'are! made o'f-..:reoord here:
a. Appendix "A"" is food 1'it 'Ia. desce..rtatioP liy IKirn
�►rster ident. aqd Sales
Anag*r of 'MGD Ppeuma t is s who make
Miehle-Deater.lblpw�:ra,
b. Appendix "B" is a scrklo s ri�aed t from a t1re11 )mown
manufactµrejr.-
C. Appendix "C" - "Noise - :Control Design For Process
Plants" S,,G,.�,qu, Bechtel, Inc.., is
a prize wigvi.ng reprint from Chemical
Engjneering',Mq&4ziPe.
3. Common sense and an understanding -of what makes noise t
will help solve most prablerns. wogld add that the
hard nosed specs for equ3pwarpt *hick are seen frequently
these days often miss theentire,.-root of the problem by
a mile. The Problems are not so much with the equipment
per se, as with its installation!
4. Some examples:
a. Case One At:a local $owsge plant, the Sutorbilt
?c ,Rvao= being giVOn fits by toe . goat-
se*kere'+... H '.bower. Was operating at
$, _
97 dobs�.. itxtt rig- a .y8" wood shim
r .
uxtder, 4 e reduced this to 83, dcbs.
Theth
tQio'•j4irk4i .
e thing e�
lid Y.O.at a s.
EN.-UQ 18
O1-18-74
S h t. ¢{ 2 t, f 1 2
b Case two - Aerodyne sold.a:high..speed blower which:
`was mounted on. the roof .of. a; plant In the. `
• country, The' neighbors, 1/4 mile down. the
road complained. Substitution of the
"industrial silencer" with a "residential
silencer" did not quiet their complaints..,
What.did quiet their.complaints:was.takipp
a pipe wrench and aiming.the "weather
head ell" on top of the $ilencer toward.
a nearby hi11 instead of at the neighbor's
side window.
C. Case three - Should be'in'the`:'plur.al..many times over
failure to, install. sound dampeners i,n
pipe and tubing'runs. These can'be a
simple piece of hose, an expansion -joint',
or other contrivances to prevent -harmonics
and resonance from developing in the. pipe
line ---and also in connected vessels and
tanks.
Engineering Manager
mlz
EN-001 fs
' 01-18-714
Sht #3 of 12
LN-0018: APPENDIX_ PA"'
From a letter to "M.G.L" reps by Ken Forster.,
1
VP Sales
Sound problems are as individual.as people. What may be noisy
or irritating to you.may.not even effect me because I am
sensitive to one frequency and you to another. "0" db is they
threshold of audibility for"the normal human ear. Ten db is
10 x greater, 20 db is 100 times greater, 30 db is 1000 times
greater, etc. The ear.is logarithmic ;in nature. Loudness
and intensity do not go band in hand, The human ear responds
to increased stimulation.rather„slowly. A sound that is in-.
creased in intensity by two is not heard twice as'loud but
seems scarsely to have change& in loudness. To make a sound
twice as loud the intensity must be_ increased by 10 times.
Three times as loud 100 times' four times as loud 1000 times.
The ear being logarithmic in nature, a.1000 cycle tone at the
110" level to reach the threshold of pain must go up 120 db or
an intensity ratio increase of,a thousand billion to one.
Loudness,is a subjective psychological sensation..depending
somewhat on the listener while intensity is an objective indic-
ation of power measureable by.an instrument. This distinction 1
1
is very important in our. -work because loudness and intensity
do not go hand in hand. Sound intensity is.measured on a logar-
ithmic scale. One decibel is a unit of measurement for each
tenfold increase in intensity.. Thus, when the ratio between
two sound intensities is 10 they differ by 10 db, 100 — 20 db
--.1000 - 30 db, etc. Each 10 db of intensity only increases
the loudness by a factor of 1. So once.egain to make a 1000
cycle tone 4 times as loud it must increase in intensity by
1000 times.
Another point to remember is that, `the ear does not respond the
same way to sounds of differing frequencies. Apparent. loud-
ness, will defend on the sound 'frequenc:y as well as its .inter!�iV.-.�
EN-001 £i
01-18-'74 '
Sht 44 mof 12.
Lower .tones .require a much gr.pater increase in iotens.ity, to
increase audibility than h.igh'A'ones'. The ear increases in
sensitivity to 1000 cycles then- fa,lls off gradually. The:
threshold of pain or extreme"discomfort has been established
at 120 db but it varies by ,frequency as follows:
50 cps, ; 125 db 100 cps. . 130 db
500 cps. . . . 120 db 7000 cps. . 123 db
4000-5000 cps. .• 116 db 10000 cps. . 119 db
All' things being equal, if the sound .intenssity .remains a.
constant the intensity..will faIL'off inversely as the.square
of the distance. For example, at 1/2. the distance (1/2)2 1j2'
its former value. At 3 times the distance (1/W or'1J9 et cetera.
Some Sound Intensity'Levels for comparison:
Faintest audible sound. Odb
Average home 2,0 to 30 db
Automobile ... 40 to 50 db
,Ordinary'Conversation . . . a 0 50 to 60 db
Heavy Street Traffic 70 to 80 db
Rivet Gun . . . . . .. . ; . . 90 to 100 db
Thunder . . . . . . . . 0 . 11.0 db
Jet Aircraft . . 0 0 140 db
The foregoing is a summary.taken from various Electronics
texts and the various Encyclopedia section on "Sound". In
out work where the specs are 85 db or 90 db noise level require-
ments it means the equipment we use to.silence must take the
noise levels at various frequencies and. silence them across
the board spectrum to a flat measuremewnt or intensity value
not to exceed the noise spec.t,o whigh we are working. This
. is why our ,.tests wer8 run 'in the ''most . adverse manner.. To
overcome the noise level to'apec .:evel''we apply a silencer
whose attenuation curve best 'a`ppl es at' the blower maximum
no3.se range.
• . ,. � EN-0018 • •
• •. 01_�8-71+ •.
Sht .#5' of 12
Noise is also a problem \of -environment. ' Hard floors, refle -
tive walls and ceilings, rigid piping and.poor•mountine, all
must be taken into account where apse control :is requirE:d..
Harmonics developing in the k'i.ping•,or mounts can play havoc,
A piano keyboard as .you may know,'. goes.frQm 28 cycles per
second on the lowest key to-4166'cps.on the•highest. The full
harmonic range,.however, tops .out above 16,000 cps. You can
see how harmonics developing in.a blower installation can
really play havoc wi.tb •th.e best.'engineering.
This is all pretty general ip .".eointex;t.but msybe it • will: -add a
little realsism to the sound apecs being so widel.y and many
times unscientifically imposed.
APAJ L LA.K NU.L bt5,
AI'I'I20X] i'1,1TE
A�IERAGIE
I NCLUDJ SIG EAR NE TWOIIK
101s
00
Thm-hold. of Painful Fcalinrj
Airplane and P!opeller•at 10 FL_
1017
12
.. E
Deafening
10t•.
E
4
Train Potting of High Speed
'a
1010
-10
-Riyeler of 30 Ft. Adto Moro 01.20 FL'
C
Pnr•untuli; L),dl of 10 Ff-
Subwoy Train r
1"
Filr Snyn at IS Ff Nosy $treat Roilwoy
0
100
i
Noisy Street
PO4r Whrslle at 1! Ff. -Autq at,-60 MPH
Meity
-
101
80-
yt
Very Nohy Rt+touronf. Auto -at IO MPH
.o
e
Avero.ce rioyrophrc� Rporn
4t•
s
•
10,
G
_ e
7_
-Factories. Auto of 20 MPH,
i
Nnise in I ollntnn (Windows Shut) '
Q
E
c
r
=
)
NC-sy 01l rce
Average
r
•
10';
�`
Avl-ro<te ;',stUuruni -
p,hr $tv, .' Aveurye/Conve solion of 7 Ff.
a
o
Ave,agr Office 04iol Street
It
a
c
_Noes, Risrdv nce ,.
=
1ps
a
SO
f
o
Quits Resfouraro - ,
Quits
c
'-
Q.ret Ofiue -
10,
40—
Mutr•um'
Ave,o a Srhool
A- raye4esi4en[e.
_
Mnt„n F rtu,t• Theater
very .
t
F
103
30-
t-nrory R-ochng R'ooms-
Aurf,toriu nt -
Quiet
•
,
Avrrc:ae Nhisper of S Ff.
s
Very O.i, I Reudrnlr =
0
10,
2
iBroodcosf;n!!
09
Stud;o
Solsrnd
l.eol
to
1a-
Zero of A.111, Stule IA ob.
-
;Room*
Zero of Original Scuk, 6,3 Dh
i
1
0— -Threshold of Audibility
t
4 1
t UN *► 0018
Page #7 of .,I
EN — 0018 t APPENDIX "CII
t
Noise -Control Des� n
-. g
For Process
Plants...,
About $290 billion will be spent to control environmental pollution
in the years 1971-1980, it has been estimated. Of thiS"about $2 billion
will go for noise abatement. It adds up to quite a challenge for engineers.
S.Z. hoU, Sachiel l6r,,
Under the National Environmental Policy Act 1472..extended thc.�eulation of poise'to other areas, and
('EPA), no project —be it a dam, pipeline, airport, hous- new legislation is being written at all levels of govern-
ing development, power station, refinery or chemical ment,
plant —can be started before an environmental impact Even withdut such laws, noire must be considered in
statement is approved by the Environmental Protection the design of a plant if a company- wants to avoid finan-.
Agency. The preparation alone of such statements has al- cial losses., For instance,. suits for hearing damaggs under
ready cost millions of dollars, and is known to have held. Workmen s. Compensation need not be based upon re -
up the starting. completion.and operation of many proj; cent noise -control laws.
ecis. If only for this reason, it is extremely important that
p1Lnt designs take into consideration the preserving and.
enhancing of the environment.
Most critical, of course, are air and water pollution.
But gaining recognition is noise pollution. Just as our air
i
and water must be cleaned up, so must the ever-increas-
�>
ine din in our society be arrested and even reduced.
Noise Legislation
The noise level of the industrialized world has been es-
timated to be rising approximately one decibel per year..
BtLaUsc of the increasing reliance on automation and.the,
uc; of higher -horsepower machines; noise levels at and '
near manufaeturin lants or trans nation to m nals
,4*v
are going up even faster. Noise is noo rely irritating but'.
' :St , t;7 126 250 SW 1,000, ,t]oD 4,typ0
czn also damage hearing when its. level becomes: s>Se�s9-
r ='Qctttwebasnd Centttr ftvquertcy, Hz•
0% high. This is why many nations have promulpa:ted:_►+aarr
!z _: and regulations in'the last decade or so to control".
r r �` lSuhwban. the `industry
nwse:
.{�dp►try
:4�,Wofk'mphp4nonly �'D¢ 'AQ 46
`•,
important provision of the Occvpational.,Safety
) 215%0tt, `, 30 �16 ao . ab
Health Act (OSHA) is the protcction.ofthe hearing
896ottlghr ` .'• +o 05> 50
':utitrial woticrs. The federal Noise Ct?ntrol Act of
'I ;es'O� t"!B - bQ 54
>.. p.t:rle Is.baerd on a paver presented ty� trw tluthpr at A nuia@ seminar
a ..+ .1 .Lt, ,.; .. t ..'. - . .
5:... . 'V, t,v corttr:,i cwr,polmnts Inc (M7 S. E Main W . Irvihe. to 427os)
-
N0l;,g CRrr9RIA {epressnt a.eys to paramet¢Fs—Ftg..1
.
: Z7
E —001 8
.
01 -1 8-74
'.
Fal t i<i Q f 1 1
NOISE DESIGN.
. .
11111111IMII111III111I)II11111
III IIII IIIIIIII1111111111111111111Jill IIIt1JIIIII{1111111111111IIIIIIIIIIIIIII11111111111111111{IIUIIIIIIIII11111IIIIII11111111111111III111111111111I11111II11111I11IIIlnlIILI
OSHA
Permissible.
.Sotand
Letels
— Table
Dail
Sound Level,
Optional Octavio Band Sound -Pressure Levels, d8.
^
Exposure, hr.
Slow Response, dBA,
63 125
250 -
500
1,000
2,000
4,000
8,000
8
90
110 103
'97'.
91
88
86
86
87
6
92
4
95
128 116
106
98
92
89
83
92
3
97
2
100
125
115
106
99
94
93
99.
1 %,
102
1
1.05
.1315"
127
116
107
100
98
105 -
/,
110
1,35
135
125
115
107
104
112
14
III IJIMIIIIIII111IIII IIIIIIII
115
III IIitI111111111111111111111111111111111111111111111111111111111IllillIIIIII)IIIIIIIII11111I
135
135
132
Jill 11111111
i21
Jill 11111HIM II111111111111111111
112
110
Jill I1111111II11llllltlllllll111111111
119
Once, communities were happy to acquire a new fac-
tory or a modern airport. But population growth has
changed many people's attitudes. Many are now openly
opposed to further growth.
Today, plants must often be located so as to not be vis-
ible to nearby residents or to passing motorists, For ex
ample, a cooling -water pumping station for a recently
built power plant had to be recessed into the shore of a
lake. and tunnels slant -drilled to reach water deep below
the surface, so that the station would not be visible._Qth-
erw•ise. the public would suspect pollution, even though
this power plant does not return used water directly to,
the lake.
Because of this change of attitude, companies can no
longer afford to ignore conservation factors.,
The.lmpact on Costs
The immediate impact of such environmental consid-
orations is increased cost. For, the power plant just men-
tioned. S200 million-25% of the total 'project cost —was
spent on environmental protection. Most of this. of.`
course, went for air and water pollution control. Noise,
however, was also carefully considered.. For instance. all
rails were welded together to reduce the noise of the
coal -carrying trains passing over them.
TY .� :'
.).. t{. , V r1I,,Jfr iY"'
"
Noise and Its Measuroment
. } r
Noise is a form of energy that is propagated by longttu-
Sound Power and Power Level
dinal waves through an elastic medium. Because its pros-
Sound -
sure fluctuates, it can be measured by pressure -sensitive
Power
devices, such as a microphone, which is one of the ee-
Level,
sential elements in a sound -level motor. ' ; .
Sound Power, Wsete dB, Source
From a soft whisper to the roar of the' large Saiurn
100,000,000 200
rocket engine, the level of sound power vares do widely
10,000,000 190 Saturn Rocket
that, when measured in the conventional unlit of .watto.
1,ow,000 180
handling the wide range of values i4 difticuit. Ttlerefore, a -
100,000 170 Military Jet
more convenient unit for measuring or COmp;ring hound
10,000 160
i povyers has been sought. In acoutitics, the term "level" -is
1.0p0 160
used whenever a comparison, or ,ratio, of a quantity to a `:
; 100 140
i reference quantity is made. Taking the, logarithm of this
10 120 75 viece orchestra
ratio greatly reduces, and so makes more manageable, .
1 1
0.1 11010 Automobile, 50 mph,
E. the range. The unit is the decibel, and, l4 atabraviated dl$.t ;.
0.01 too
Sound -power level, dB. 110 IMO (IN!W)
0.091 90 Shouting
0,000,1 80
Here, INa the sound power of the source.til Watts, and
0.000,01 70
Normal conversation
I Wu e a reference power, commonly 10-4 wilitts. The con- :,
0.000,001 60
venience of decibel unit is illustrated by the table
0.000,000,1 5o
Sound -pressure level, which Is comnwrily denoted is
0,00010001011 40
-
SPL and measured in decibels, is a a4ft M of the ."129
.',
s„ 0.000,000,001 30 Sort whisper
� i
nituds or intensity of noise:
t;'r.[^+-�+wr R"p., a••r. t.j^, "'4/,,°8,q•. '�,'� .inn-•.st�lr+wt....tl ,r
SPL . dB. _ 20 logy„ (PIPJ
;once -sound pressure commonly used is 0.0002 microbar,
_
' Here, P and P. are the pressures of;,Mspectively, t4
'whi4o'is approximately the pressure of a sound barely
noise being measured and a reference ltgyad. °Phe refer
siudlble t9 a youth wilh'healthy hearing..
�, ... },�„�?wM�..J. ?,,iG.�ti, 1:N''A LiS ibLfi,�'.1%Y-.[. -'+ _S 1• . i-.YuLwf•�.�,.eSfi..r eJix,A �e,a',. w.... ., .. ,..
CF,rlcs
Another, impact is the longer time required for the
construction of a plant. The additional equipment and
the 'required refinements all tend to delay project sched4
ules.
Exactly how much the cost and the time of'a project
are increased depends on the design, which here is de-
fined as including everything from original concept to fi-.
nal operation.
The first design consideration is site selection. How can
site selection prevent noise? By the most basic principle,
in noise control —putting a lot of distance between the
noise source and the receiver. A plant can be located in
an isolated place. This, however, is exactly contrary to
the usual standards of good site selection, namely, close-
ness to transportation, raw materials, labor and consu
mers. A remote site requires building special roads, rails
and waterways to a plant. Raw materials and finished
products must be hauled long distances. Very often, rec-..
reational facilities are also needed to attract the right
kind of workers. All these meant extra capital outlay and
increased operating expenses. So distance alone is usu-
ally a very expensive way to control noise.
Noise -Design Criteria
The first step is to establish noise criteria —whether it is
to prevent hearing damage, avoid community annoy-
ance. reduce speech interference or increase employee
comfort. The criteria will determine at what location and
to what level noise will be controlled.
Hearing protection is regulated by OSHA standards,
which limit noise exposure for the durations shown in
Table I. These limits apply to plant noise measured close
to the source.
A criterion covering Community noise is more difficult
to establish because of the complexity of human reac-
tions. Factors such as:sex, age, income level, mental and
physical health. special sensitization or immunization
make it very hard to judge what level of noise will be ac-
ceptable. Research to define the psychological effect of
noise is currently being pursued. and some day a univer-
sal criterion will be established. Until then. the designer
must rely on some of the'common rating methods now
mailable.
F-ig. I shows residential noise criteria developed by the
Army and Air Force. Receiving more popular support is
the simpler method given in Table 11, which uses a
single -number, A -weighted sound level for rating com-
munity -noise levels.
S(•menstates, such as Illinois, have enacted ordinances
libm call for the nondegradation of the environment. The
Illinuis law allows_a plant to be built if, among ether
things. it does not raise the noise level above that already
pre:cnt, which is difficult not to do. Across the country,
nor�e ordinances such as this one are being written. with
permissible residential levels varying from 30 to 55 dMA.
With regard to the speech -interference criterion. it has
ben. found that sounds in the frequcncy rang of 400 to•
_�r:r'• Hz_ tend to mask spoken words if the lc%els are
c:. rable. For a conversation to be carried on without
it is necessary that the noise level be appreciably
! than that which wtiuld - cause hcnrinc damage.
;:r• V; -:., 1973
slit
Qefiniilonsp of Nolpe-Control Terms
,Audio FregUency--The range of . normally audible
sound, approximately 15 to 20,000 Hz.
Audiogr&m Agraph showing hearing loss, or percent
hearing, as a function of frequency. ' ,
Audiomeferr-An Instrument for, measuring hewing
acuity.. Measurement may be madrf with recorded.
speech or tone signals.
Cycles/Second-.A unit of frequency, also called the
Hertz.
Decibel (dB.) -The pnit of a bevel that denotes the ra-
tio between two quantities that are proportional TQ
power, It Is also the unit of sound -pressure level.
frequency (1)--The reciprocal of the period of a tunc-
tion periodic in time, expressed as cycles/sec; or
Hertz.
,Hearing Loss —Amount in decibels at a specified ire- -
quencyby which the -threshold of.audibility exceeds
the normal threshold.'.
Hertz (HIJ-CycleicKond,
Level -The logrlthm of the ratio of a quantity to a ref=
erence quantity of the same kind. The kind of quan-
tity, the reference quantity and the base of the log-
arithm have to be specified.
Microbar..A unit of sound pressure equal to .1
dyne/sq. cm. or0.1 Newton/sq. in.
Petave Band —A range of frequencies in which the up-
per bound frequency is twice that of the lower bound..
Preferred octave bands: have .center frequencies of
3t,5, 63, 125, 250, 500. 1,000. 2,000, 4,000, andB.000
Hz.
Octavo -Bond Pressure Level —Band -pressure level for
a frequency band corresponding .to a specified oc-
tave.
Pitch —The attribute of auditory sensation by wh-ch
sovndb may be ordered from low to high. It depends
primarily on the frequency, but also on the so,d
pressure and wave form. of the stimulus.'
Power Level (Lw.)—.The logarithm to IlWbase •10 of
the ratio of a given power to a reference power mutti-
plied by 10, The unit of power level Is decibels.
Pure Tone —A sound wave whose instantaneous
sound pressure is a simple sinusoidal function of time.
Sound Power (W)—Total sound energy radiated by a
source per unit time.
Sound -Pressure Level (Lp or SPQ—The logarilhrr to
the base 10 of the ratio of the pressure of a sound to a
reference pressure multiplied by 10. Unit of SPL is
decibels.
Wave length —The perpendicular distance between
two wave fronts In which the displacements have a
phase difference of one complete period -
Table III gives some representative allowable speech-in-
terferencelevels, defined as the ;arithmetic average :� the
sound-pressure1evels in the octave bands of 500. 11_i,)0,
2,OCK) and .4.000 Hz.
Allowable Noise Levels
Once, the Criteria are'established. allos%able nui�-, lev-
cl .an lie;'it«i�ned to diflcrent part: 6f 'i pl.' l , ; in-
1 7S
el,
f
NOISE DESIGN ...
FM
ski
This s"1111-ti" tw rt it �'Ilnd or. Ash,ttriclu red is,44s!
.,"arn, 'aht'r, my be . ours. of
this sPrc lllutlor sf.fi, that th, pflfris,lbls, no '1 It $or
1.0 the lft,01�fsieo-ll, 01 the p-jeo
- In : lhIn 11: 1 ' ndi sljp_ oats ..,.it ..L.tb.d tO 010
q t. i I IV., and 01ti J th' Pf .. d ... tfor tq,I,r,V.
and 9 .... Ins, .4e tevals fol, the .4opeant
k4 of led.
1, In, Idllorin9 I . ton4m,dt snail awly unless othar.1so stoked;
ANSI S1.1-1960 ik,p., I i. at ANSI S:.2-J962 M.11yd for the P r Of Sound.
#kWS 5 .4- 961 Sp.c iliutior,t Ipr Ornarll P.1p... $0,nd
'Level
ANSI S1.11-1 10 OLL 0, f-OtLlvc, end ThIrd,Oct*v# Wd
m,0.11 Set,
ANSI Sl.l)-1970 Methods f0f't1,* "Ist-FasaWrL Q! SWed Pressure
L-1A,
0 RmiSSiBLIF Moist LEVELS . ; . .
3.1 The saalrete.Darmltt able noise 1-1, for h Item of Qvlpra_t ...
raiseborn on the d". 'hise". he no, 1.0 Pro-
I_ivil , :I� I lis". be hot .....0 0 ... ... ....
3.2 If the actual in soV an, OCt#Vs 1,11ii •,::ad, there I.,
the tlipdj hL No b, nor. 1". 5 Its. the pj b..-1e
level for h., land 11,111 b.,5 do Its$ then the indicatqd Perlis,
1.3 the prfnias lh 1. noitd JJ, spot, so .,t..l Installed condil' *11
for IN _' "T'"inS at "'i 9nl-1load, If acoustical It.. _.
or Ih-d' .1 Int1-001 are Proposed to red- then
In. or refer
'h
f pee of tI I ad th, 1--rilart d..I,,:d ,
properly incorporated in the -1-1 insitstl4li.n.
4. KEPDRIING
4,1 IN. .,Jp_.t ..ppil.r ."It at.$. In his q.0t.liff. In. ....d pr. ... w
NOISE I,ILVELS ISF EQVIFMI%T
A-Sil
0 r. V#21
1, of N by u<ta- behil, if,. 10.1. Prp iOld r. Lhe
J"I.14.1 n.10V M. IN- .11.0166 tq th.
irt-s;tign. IN.. -;,,, prHoir.,ri- lit lit considered, IN.
41-ti- Pf 040-in on. 0-spi.4 of - D'o",
1J.2 Th, rok,.o sov.0 I ... 1. %h.j1I be sajd enrol She
dal, -il9i I . . . . .
L'Il Act..) In ..PPI 1. shop in th
refirr .... It sit hdo,
W.1" it"s att. tt.;9.d An . d.pl.161. unit h finder
.Inil.r Condition, in isn,..40.9 start
Not- test data -1,, d On . -PI "at. -It at itw
tulr-
plier'1,plant, Jr. accordance pith re(ii-ed it.ndk,ds
A.. ?A A 'fit.pricol j Oisi.rol 9uar.ntee that It 1p
h, pj-
of io9 �rd.l 0.09-Is i ..r. will
ho, Prod-
1 F ..... lot. 1?-Iii 'p-i4ifi0,
1,.3 All do,, atoll hr car tJf isd 1,., also.. 4r,or1.O9taLle and .,P.,i a<r<e
t, or the -.at less s1..11 0.
liable, Ins, io-, feral end the NGlly sty 0 It...
Sho.le or ptrl. d 1. •ddit ion .0 111. 90
1.1 if in the opirigh of the *00poent "Ppli a'. he
ravel.-h., be "I JIni3O I -rsI,9 of q"P'
uti,,O A large . Ir, -, tat.
..V Psi. 0, to t ,kg and quo t no
to. "",.Ory ri.e ." L work, but r.o.,ting the - [-,Is
he if or*R*rfd 0 9wara,too for the qor rpwant he rill '"'I
' - In- .
s.slu.ting his b;d. 11.11tisl ill add 0, &11 �c .for 1 troops.
astot:mcils"ry to rpd"e the Noise to the *p44i`fIsd.I#1ja:$.
5.7 oil d.,,j.tI9.s is- 1h.1 LP..lfj1fI( 1WI.f lar clearly
in the bad. the abs"', of fetea list Split be C-IL'I'l 11
i.di.otin$ &Via.# c Vjiaa&`! rilh.thk. o'l and
'r
. qfp0
11s*pL '
-1 1 i, ho lotion, .1. 1p�c 11,alljoc ,J his .,.Lt. the Wiar
.hell 9r.ht to met th. ra itr,l.vel re"if"nN, of I his
and she atb.d data shaft. any J;I she
b.yo, or %N. ,If#, ... mall
of
the lasts 0 , fai to t. wras th.
9"!-keed noise loyal, I hall No at OF aa".%a,V' 44. 0.1141.
E-N - 00 1 ti
IS. 7 4
S fit .�,i 0
NOISE SPECIFICATIONS must convey exact requirements,. yet leave Is . quipMent design to minufacturer.41g.,,2
stance, to protect the hearing of the,workers, all the oper-
ating areas will be assigned a maximum 90-dBA. noise
level. This is ii�t low, but it meets present OSHA require-
ments. The sound level in control areas can be set at 65
dBA., and at no _more than 50 dBA, in offices. At the
plant's property line;
a 55-dBA. maximum can be set in
the direction of.a community, and 65 dBA. in directions
where only industrial or agricultural land adjoins. .
A noise level map such as this, superimposed on the
proposed plant layout, can be used to set the allowable:
noise level for each machine, or to determine necessary
properties L of construction' materials for buildings. or the
need I for partitions. Sometimes, noise levels at ccrtain
points are calculated from known or assumed nQiseL char.
aoteristics of adjacent equipment.- Such information can
be v I ised to determine whether the noise level of some of
the 0quiPment will have to be lowered.
Ill -practice, such measures are not easily implemented
1 7, '7
71 4:.".
17
n
d4:44w Mews
Human ears do not hear sounds of different 'fre,
+10
quiencies equally "fi.•Sounclist low and at Very high
quencles generally have to be bigher in level than those
A 0
at frequencies around i.000 to 2,OQO Hz. In'order,to be,
judged equally loud: This 0iiic4mination. of
10
'
sounds at both ends of Ibis audible treQuency specti" l8 . '
simulated by weighting networks in sound4evel ff!Ja!I6M
Y
4�20
~
Usually, there tarethree such 'Wog htiri� r;etWI;forks. ;in s
sound level meter -designated A..13 ang C-Cofr*Whd,-
Ing to the hearing characteristics of the ear f6i low me-
figure
ilium and Ngh4evei pvre-torne, *ounds. The 04tdws
'40
the frequency re4ponses of these 6etworks. for simptic-
sty, sound levels measured try these wjigtping`net*;*s , A..,.
'
__60
are expressad asd8A,_0.5t5.cr do 1EJ 11,1LILM, lu,u.j-
Frejuency, Hz.
R I 1-'�
MOYiMMA M
t yx-5 . y
y
01 118' 74 ,..
1
Sht #1.1. of 1�
IIIIIIIIIIIIIIIIIIIIIIII111111111111111111111111H111111111111111l1111111111111111111111111111t1111
� pIN11Rf111J1gII111111U1111illllIli.IIIIIl111111111111111111111111111111111111111)IIIIIIJIIIIIIIIII
Community Noise dBA. Levels - Tabls I
Causes and Cures for Noise Table. IV
Daytime Nighttime
NoiseCaused By
Can Be Reduced By
Residential
Aerodynamico—,fan Intake and
Reducing velocity; using absor•
Country 40 30
, .discharge, ventii, steam jots, etc,
bent ins tenal.and silencer. .
Surburban 96 35
Flow in pipes —gas or vapor.
Reducing and increas-
Busy urban 50 40
lines, compressor inlet or dis-'
velocity
ins pipe 'size; avoiding sudden
Contiguous to airport
charge pipes, etc.
9 p p
changes of pipe size and direr-
Indoors 87
,
: tion of flow; avoiding abrupt
Outdoors 106
obstruction;..
IIIIUI1111tIIII1tIIIIIIl11111Ullllllllllltlllllllllnllll111111RNIIIl1111II1111Ulllllllllllto
`(Metallic contacts .— grinders,
Substituting other materials,
mills, conveyors, etc,
such as wood, rubber, or plastic
for metal.
Stamping p blankin unche
Ch h
Itllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll.l
Speech Interference Levels —� Table. III
Maximum
Level,
Location
dW
Process plant area (except control room, etc.)
75
Field offices, control rooms, machine shops, etc.
65
Secretarial and accounting offices with machines
60
Large offices, laboratories
55.
Small offices (3 people or less)
45'
Conference rooms
30 - 35
•Measured when the specified space is not occupied
III Ii111111111111111111111111111111111111111111111111111111111l111111111111111111111111{II111111111
because the sound power level and directivity of each
piece of equipment are different, and because the sound
fields of machines interfere in a complicated pattern.
Sound -reflecting and absorbing surfaces sometimes.make
ar, accurate prediction of noise level difficult even for ex-
ptmenced specialists. Once permissible equipment noise
levels have been determined, however, these must be
conveyed to manufacturers.
Noise Specifications
"We won't have any noise problem on this project, be-
cause we told the manufacturers to supply quiet ma-
chines." ,
-'Did you issue noise specs with your purchase -or
d ers?"
"hb. We just told them they have to comply with
OSHA standards."
This conversation between a design engineer and a
n<;ise specialist highlights some common misconceptions
k_r,-,ut noise specifications. The engineer's solution is ob,
% i ously too simple. OSHA has set noise levels, not a noise
lc el. If, for example, a vendor supplied a pump that op=
crates at 90 dBA., he would, of course, be complying
%.*i, OSHA standards. But a pump at 115 dBA. would'
z satisfy OSHA standards -if it were run only 15 min-
or less each day.
the vendor knows that the pump will be operated
r,unusl�. he would, pf course, supply one that gptr-
C g—p s• anging,Into 4 ear ng action.
Vibration of machine casing —
compressors, blowers,engines,
etc.'
Blade passing interference —
turbines; fans, blowers, etc.
tonic flow in control valve —
steam reducing stations, safety
relief. -valves, etc.
Sliding or backlashing—convey-
ors, gears, etc.
Amplificatipn due to, reflec-
tion—pumphouse, compressor
station,' etc.
Using sturdier design or dam p-
ing material.
Increasing gap between inter-
fering pans,
Reducing pressure drop or dis-
sipating flow energy.
Controlling manufacturing tol-
erance and using proper lubri-
cat ion.
Applying acoustical absorbent
to reflecting surface.
Electrical or magnetic force— Avoiding resonance between
motors, transformers, etc. machine parts, and frequency
of alternating current,
IIIn1111111111111111111111111111111111111111111111111111111rIII1111111111111111111111111111111ig1111
ated at 90 dBA. Suppose further that, instead of one
pump, two. were installed, together, and the noise mea-
sured 93 dBA. Is the vendor to blame? Hardly. Only,the
engineer could have known the noise reflecting and rein-
forOng effect of the final installation. He should have
specified'a lower noise level for each of the pumps.
OSHA standards cannot be the only criteria. if certain
equipment is to be installed next to where 90 dBA. would
be unacceptable, its noise level would have to be low-
ered, even if it complied v6th OSHA standards.
Also.to be considered is where the noise is measured.
OSHA's.intent is to protect the hearing of workers, so it
specifies that measurements be made.3 or 4 ft. away from
most equipment (where workmen's can are generally). If
where the measurement should be taken is not specified,
a pump ordered for 90 dBA• might' only measure 90
dBA. at'] 5 ft.
The foregoing shows the importance of preparing
specifications pfoperly._To convey exact requirements, a
specification trust include .the permissible sound level,
where'and,how,this level is to -be measured, and the type
of instrument .to be used, Spe6fieation should at,, ask
vendors to'state.exceptions, if any. and t6 describe meth=
opts of noise cofitrol. In the past : a flat warrantx' seas
� .. t � �3{L :t :..F�,y :f '},8•a.. Fri ty.:,�. 'Y�,' '. 'i,
EN , 0G l h
skit #12 cif lw
NOISE DESIGN. +
; eyutPtnent suClt as a heater or a large comprc.sv)r, may. ,
,.
COfnbinilp l ourld )i eY@if be bought before a noise Specification is developed. Fur r:
When there is More than ono (pound ¢t any locatibn the
" they, legal or community standards may changv nccessi
and pressure ,is Increased le
But because s0Wnd,w* 6ting ai�ditional work .to bring,the plum into cczmplianee
e defined logailthmically, ;h+. resultant sour dlevel 1s with the new laws
of an pigebrail; sum ot.the Indlyidual levels 'The Homo-
ram shows how .tW4 sound iavelis can be comblriad + Field Atbatement .
t, I'
DC61:161% to t?p add4d to higher lfevel t
The next step is field abatement. This involves the op
3.0
2.6 fs i0 Q:Q 0.6 0.4 '1f3 0.2 ' � ?, , ;imuM employment of noise -control principles'and'rrta
terials.'Theoretically, Boise can be controlled at -an), of
t y a A 6'7 8 :e 1 A"I",s as •ta three places: the source, the receiver or tb.e path. Source
tb` " controlling occurs when equipment is designed and built
C)fffer®irtop to 040144 ttstYve4n twn levrla so f uo�nbtrt®d r
4, dR . according tq.8 noilie specification. Control at tht rt;cciver,
is'out of'considerati.on for most cases because OSHA in
mare than two sound revels arcomiined the' : spectors'are not very willjng to approve the usc. o.f hear
ird is added to the cgmbined rosult of.the f ysttwo in tha. ', .: ing protgction as a permanent means of noise cr,ntrol
me manner, and so -on. -it is useful tQ' know. that when',' j This leavers controlling the:patlrof sound trar<smttition:
o sounds of Apue'i jevel sire added, the, ifiew; is on,ittj .,. 'One ,ot the most useful ;eclin Sues of the: last i ,to in -
vase of 8 08. timllarly tenfold lriprl +iP ir to ose a barrier between- the source' and its surround
ises the sound level by only 1d d6 r` ,r:'.
ngs; This can be either a• complete or partial enclosure
or just a'partition. .To be effective, the �piateri4]' of the .
barrier has to bG dense and impervious. A Complete en-
closure should be designed so:that any necessary supply
thought to scare away prospective vendors, or to prompt of air is not qut off, and that the temperature inside it
them to add a large contingency onto equipment price. does; not becorpe dangerously high. Convenient access
Since then, many fabricators have learned to make qui- formaintenance should also: be provvided.,
eter products. It is now a good idea to require a guaran- Sometimes, the high level of noise. is due to xellwion.
tee from the vendor, so he can be called in to help if a This 'ean' be reduced :by applying absorbent material on ,
problem should later arise. the reflecting surfaces. When sound waves travel through' }
A typical noise specification is shown'in Fig. 2. this material, both upon ,incidence and after being re
The preparation of noise specifications leaves the task fleeted at the surface behind it.'a portion of the energy
of designing quiet machines to the manufacturer who, by will be expended in the form of heat so the noise that is
virtue of his special knowledge and .experience, should bounced back will be reduced,'
be entrusted with this work. There are: however, a few If the noise sourcecan be identified, a battle can usu-
basic principles of noise reduction that will help the de- ally be built around it, so that the noise can only reach a'.
sign engineer. These are given in Table IV. person after many reflections. Further.: if .the surfaces
where the reflections occur arc lined with a.bsortt`nt ma -
Noise Survey aerial, a first-class noise -reduction device is created. The,
barriers of the baffle cut off the direct line of noise trans -
Designing for quietness does not stop at writing speci- mission from the source to receiver. and increase the
fications and buying low -decibel machines. What is pur- length of the propagating path many times by forcing
chased may purr like a kitten or roar like a lion,' depend- many surface reflections. Also. a portion of the acoustical
ing on how reliable the vendor is. This is.why a noise energy is absorbed at every reflection point.
survey is an important next step. A silencer or muffler will usually reduce tie sound.
Conducting noise -level measurements immediately af- level of noise .caused by the flow of large quantities of a
try the plant -is completed will serve several purposes. It gas or vapor at high velocities. There arc many suppliers
will enable the project engineer to determine whether the of this product, and most of the time a standard size can
plant is in compliance with OSHA requirements and lo- be selected. 'a
cal (rdinances. And it can verify the noise performance
of equipment while vendors can be called back for coy, Met t the Author
ri_ctions at much less expense. rather than when modi- f
f:cations can only be made during o regoular or emergencyS.C.Lou isAssistant Chief Pressure y
- G .vuasel FnO.heer too Bechtel's Affin-
,0)utdowns. The survey will also determine where further e y and Chen -cat Div. (so Beale st-
6an, Francisco. CA 94105) and the 4
noise reduction is necessary.. compefry•s toad,ng noise aeecialtst
A graduee' of the Henry Lester
There are many - reasons for field noise -reduction Technical Instnule of Shanghai. • �',���
-tither than attempting to control noise at the design chine, n e,so received a sa
- from' Unive•say of Arkanss as.. an '!4--�►y's
ge. First, factors such as vibration. resonance. ntarru "" nn F 111" Cornett university and a �.
'Ph.[). fro+ Un,vereity of eai,fania at
foCtllrinL tolerance, alignment and installation. all tend to.- Acoustic .A. mot Arn of nd In.
- ` ACOUS6cai Sic Ot Ameifca and In.
.•
eke the prediction of noise levels less than tOf> i aCCtl strument Sr- of Arrtenca'S Cnnuot
1� - ' vaive Nose , mmihee, he is a reg-
"f'LC. SccondIv. tll'ne may limit the inCorppliatiOrt of Si;- i5tered ing nee- in the State of Call-
.
tenting features. for it is pooihle that long -delivery torniap^aADens;Grnade
NOVEMBER'2rk, 1972?r.* hUCAL EMG'ti�)rF�INC
a ^1
CITY OF
CHANHASSEN
7610 LAREDO DRIVEOP 0 BOX 1470CHANHASSEN, MINNESOTA 55317
(612) 474-8885
MEMORANDUM
DATE: October 4, 1977
TO: Planning Commission and Staff
FROM: Bruce Pankonin, City Planner
SUBJ: Minnesota Pollution Control Agency Noise Standards
Attached hereto, for your consideration and review, is the Minnesota
Pollution Control Agency's (MPCA) noise standards. Al Perez, noise
expert from the MPCA, will be available on Wednesday, October 12, 1977,
to answer any questions you may have regarding the attached.
s
. j1Y{•, f 3
s y 1 � a ..� .�•:a
MINNESOTA STATE ::
!
R'EGULATIQN$�� t � a
`,� � fix? � � �'� ' ', •S�r 3
:MINNESOTA�JPOLL
UTI4r
CONTROV"AGENG�'Y
.�•. yt i fie,w.
r I'+'y, i � � xx.+ �- �.
r - - NOISE POL�x,.U'x�tION C�otQ .,
00
1 47r
�:,►x.It
r` NPC 1 Nobe PD�n!bronudon •Vp10
' NPC 2' Nobe &andot+i3r
Ned with tho 8omet"y at , �,R`:;i±r'
and C mmLdmor of Admhdsftudlq, . , i r
Wo"om h. Yf. 1974,
Dbtrib
t�
SECTION, DEPARuT�p F y
Room 140 CenMnnLs l B OF ADM1Nll97
St. Pouf, mhnm t'ai
1C '
NPC 1 Definitions, Severability and Regulations Variances for Noise Po1luQon Control
(a) Definitions. For the purpose of all noise pollution control regulations:
(1) Agency. Agency means the Minnesota Pollution Control Agency,
its agent, or representative.
(2) ANSI. ANSI means the American National Standards Institute or
its successor bodies.
(3) Director. Director means the Executive Director of the Minnesota
Pollution Control Agency.
(4) Daytime Hours. Daytime hours are those from 7:00 a.m. to 10:00
P.M. (0700-2200).
(5) Nighttime Hours. Nighttime hours are those from 10:00 p.m. to
7:00 a.m. (2200-0700).
(6) Person. Person means any human being, any municipality or other
governmental or political subdivision, or any other public agency, any public
or private corporation, any partnership, firm, association or other organiza-
tion, any receiver trustee, assignee, agent or other legal representative of any
of the foregoing, or any other legal entity, but does not include the Minne-
sota Pollution Control Agency.
(7) SLUCM. SLUCM means the Standard Land Use Coding Manual
(1969, United States Government Printing office) which designates land
activities by means of numerical codes.
(8) Sound. Sound is an oscillation in pressure, stress, particle displace-
ment, particle velocity, etc., in an elastic or partially elastic medium, or the
superposition of such propagated alterations.
(9) Noise. Noise means any sound not occurring in the natural en-
vironment, including, but not limited to, sounds emanating from aircraft
and highways, and industrial, commercial and residential sources.
(10) Impulsive Noise. Either a single sound pressure peak (with
either a rise time less than 200 milliseconds or total duration less than 200
milliseconds) or multiple sound pressure peaks (with either rise times less
than 200 milliseconds or total duration less than 200 milliseconds) spaced
at least by 200 millisecond pauses.
(11) Non -Impulsive Noise. All noise not included in the definition of
Impulsive Noise.
dB. (12) Decibel. Decibel is a unit of sound pressure level, abbreviated
(13) Sound Pressure Level (SPL). Sound Pressure Level is 20 times
the logarithm to the base 10 of the ratio of the pressure of a sound, p,
to the reference pressure, p,. For the purposes of these regulations, the
reference pressure shall be 20 micronewtons per square meter (20 µN/m').
In equation form, Sound Pressure Level in units of decibels is expressed as:
SPL (dB) = 20 log,,,p/p,
(14) dBA. dBA is 'a unit of sound level. dBA is the weighted sound
pressure level by the use of the A metering characteristic and weighting as
specified in ANSI Specification for Sound Level Meters, 51.4 - 1971, which
is hereby incorporated by reference. For the purpose of these regulations,
dBA is used as a measure of human response to sound.
rA
a
expressed in dBA, which is exceeded
(15) Lto• 1-1° is the. so oae hour survey as measured by test procedures
ten percent of the time fora which a exceeded
b the Director• dBA, test proce-
approved Y expressed as measured by
(16) Lp• l °° is the soundne hour survey,
fiftypercent of the time fora the application
du s approved by the Director. Of any iegulation or such invalidity
if any provision provisions
(b) Severability• lication, and to this end the p
an person or circ or aFP s is held to
dare declared to be
thereof to Y provisionlications
shall not of ctof anthe various app person
of all regulationsOil ccuaasances
severable. wrritten application of the
would cause
(c) Variance. WhereU on at by reason of excep lation
the Agency on
th noise TCg not feasible under
or persons, with any provisions le army raatical on such conditions
strict conformity would be unr may pelr�itit a variance uP reventiony
undue hardship, ency it may prescribe for thptent of the
the cucumstances,`tnhl� AgencyWas ith
in bartnoay With the
and within suchent Of platys•
control d anyaapplicable Federal
State a.n
2
NPC 2 Nola Standards
(a) These standards describe the limiting levels of sound established on
the basis of present knowledge for the preservation of public health and
welfare. These standards are consistent with speech, sleep, annoyance and
hearing conservation requirements for receivers within areas grouped
according to land activities by the Noise Area Classification (NAC) system
herein described. However, these standards do not, by themselves, identify
the limiting levels of impulsive noise needed for the preservation of public
health and welfare.
(b) Noise Standards
Day (0700-2200) Night (2200-0700)
NAC La _Liu
_ L. U.
1 60 65 50 55
2 65 70 65 70
tt3/� 75 80 75 80
(c) Noise Area Classification System According to Land Activity at Re-
ceiver. Acceptable sound levels for the receiver are a function of the in-
tended activity in that land area. The following noise area classifications
are grouped and defined by the SLUCM numerical codes and descriptions.
(d) Noise Area Classification-1 (NAC-1) includes the following land ac-
tivities:
NAC-1
11 Household units (includes farm houses)
12 Group quarters
13 Residential hotels
14 Mobile home parks or courts
15 Transient lodgings
19 Other residential, NEC*
397 Motion picture production
651 Medical and other health services
674 Correctional institutions
68 Educational services
691 Religious activities
71 Cultural activities and nature exhibitions
721 Entertainment assembly
7491 Camping and picnicking areas (designated)
75 Resorts and group camps
79 Other cultural, entertainment, and recreational activities, NEC
(e) Noise Area Classification-2 (NAC-2) includes the following land activi-
ties:
NAC-2
4113 Railroad terminals (passenger)
4115 Railroad terminals (passenger and freight)
4122 Rapid rail transit and street railway passenger terminals
4211 Bus passenger terminals (intercity)
4212 Bus passenger terminals (local)
*NEC — Not elsewhere coded.
4
4213 Bus passenger terminals (intercity and local)
429 Other motor vehicle transportation, NEC
4312 Airport and flying field terminals (passenger)
4314 Airport and flying field terminals (passenger and freight)
4411 Marine terminals (passenger)
4413 Marine terminals (passenger and freight)
46 Automobile parking
4721 Telegraph message centers
492 Transportation services and arrangements
51 Wholesale trade
52 Retail trade — building materials, hardware; and farm equipment
53 Retail trade —general merchandise
54 Retail trade —food
55 Retail trade — automotive, marine craft, aircraft, and accessories
56 Retail trade — apparel and accessories
57 Retail trade— furniture, home furnishings, and equipment
58 Retail trade — eating and drinking
59 Other retail trade, NEC
61 Finance, insurance and real estate services
62 Personal services
63 Business services
64 Repair services
652 Legal services
659 Other professional services, NEC
66 Contract construction services
67 Governmental services (except 674)
69 Miscellaneous services (except 691)
72 Public assembly (except 721, 7223)
73 Amusements (except 731)
74 Recreational activities (except 7491)
76 Parks
(f) Noise Area Classification-3 (NAC-3) includes the following land activi-
ties:
NAC-3
21 Food and kindred products — manufacturing
22 Textile mill products — manufacturing
23 Apparel and other finished products made from fabrics, leather,
and similar materials — manufacturing
24 Lumber and wood products (except furniture) — manufacturing
25 Furniture and fixtures — manufacturing
26 Paper and allied products — manufacturing
27 Printing, publishing and allied industries
28 Chemicals and allied products — manufacturing
29 Petroleum refining and related industries
31 Rubber and miscellaneous plastic products — manufacturing
32 Stone, clay, and glass products — manufacturing
33 Primary metal industries
34 Fabricated metal products— manufacturing
35 Professional, scientific, and controlling instruments; photographic
and optical goods; watches and clocks — manufacturing
39 Miscellaneous manufacturing, NEC (except 397)
41 Railroad, rapid rail transit, and street railway transportation (ex-
cept 4113, 4115, 4122)
42 Motor vehicle transportation (except 4211. 4212, 4213, 429)
43 Aircraft transportation (except 4312, 4314)
44 Marine craft transportation (except 4411, 4413)
45 Highway and street right-of-way
47 Communication (except 4721)
48 Utilities
49 Other transportation, communication and utilities, NEC (except
492)
7223 Race tracks
731 Fairgrounds and amusement parks
81 Agriculture
82 Agricultural and related activities
83 Forestry activities and related services (including commercial
forest land, timber production and other related activities)
84 Fishing activities and related services
85 Mining activities and related services
89 Other resource production and extraction, NEC
— All other activities
(g) Noise Area Classification-4 (NAC-4) includes the following land activi-
ties:
NAC-4
91 Undeveloped and unused land area (excluding non-commercial
forest development)
92 Non-commercial forest development
93 Water areas
94 Vacant floor area
95 Under construction
99 Other undeveloped land and water areas, NEC
(h) Measurement Procedure. A measurement procedure approved by the
Director shall be used to determine the acceptability of sound levels in a
fiven area. Such measurements shall be made at the point of human activity
to the receiving area which is nearest the noise source and which is typical
for the Noise Area Classification category of the receiving area, except where
existing barriers, obstructions or reflecting surfaces prevent an accurar. measurement. All measurements shall be made outdoors.
(i) Exceptions
(1) The Standards of NAC-2 may apply to buildings within the follow-
ing NAC-1 categories: 11, 12, 13, 14, 15, 19, 397, 651, 68, 691, 71, 721, if
all of the following conditions are met:
(i) The building is constructed and insulated in such a way as to
assure that the exterior -interior sound level attentuation, measured under a
measurement procedure approved by the Director, is at least 30 dBA; and
I
(ii) The building possesses year -around indoor climate control; and
(iii) The building has no facilities intended for outdoor activities, in-
cluding but not limited to yards, swimming pools, patios, balconies, tennis
courts, golf course, gardens and picnic areas.
(2) The NAC-1 Day Standards may apply to land uses in NAC-1 cate-
gories durin; nighttime hours in lieu of NAC-1 Night Standards if such land
uses are not intended for overnight sleeping.
CITY OF CHANHASSEN
CARVER AND HENNEPIN COUNTIES, MINNESOTA
NOTICE OF PUBLIC HEARING
ON PROPOSED AMENDMENT TO CHANHASSEN ZONING ORDINANCE
TO INCLUDE MINNESOTA POLLUTION CONTROL AGENCY
NOISE STANDARDS
NOTICE IS HEREBY GIVEN, That the Planning Commission of the
City of Chanhassen will meet on Wednesday, August 14, 1977, at
7:30 o'clock p.m. at the City Hall in said City for the purpose
of holding a public hearing on a proposed amendment of the Chanhassen
Zoning Ordinance which would incorporate the Minnesota Pollution
Control Agency's Noise Standards by reference.
The proposed amendment would entail an amendment of Section 12.07
Subdivision 1 of the Zoning Ordinance to incorporate the Pollution
Control Agency's noise standards by reference.
Copies of the Zoning Ordinance and the Chanhassen Zoning Map
are available for public inspection at Chanhassen City Hall during
regular business hours.
All interested persons may appear and be heard at said time and
place.
Dated: August 29, 1977 BY ORDER OF THE PLANNING COMMISSION
Bruce Pankonin, City Planner
Publish in the Carver County Herald on September 1, 1977.
CITY OF CHANHASSEN
CARVER AND HENNEPIN COUNTIES, MINNESOTA
ORDINANCE NO. 47-I
AN ORDINANCE REPEALING SUBSECTION NO. 1, NOISE, OF
SECTION 12.07, PERFORMANCE STANDARDS,' OF THE CHAN-
HASSEN ZONING ORDINANCE AND ADDI'NG.THERETO SECTION
19.20, NOISE STANDARDS.
THE CITY COUNCIL OF CHANHASSEN ORDAINS:
Section 1. Subsection No. 1, Noise, of Section 12,07, Performance
Standards, of Ordinance 47 entitled, "The Chanhassen Zoning Ordinance"
adopted February 8, 1972, is hereby repealed.
Section 2. Section 19 of Ordinance No. 47 entitled, "The Chan-
hassen Zoning Ordinance," adopted February 8, 1972, is hereby amended
by adding thereto the following subsection to read as follows
19.20. Noise Standards.
a. Incorporation by Reference.
A certain document, a copy of which is on file in the
office of the City Clerk, marked "Official Copy, City of
Chanhassen" and designated as Noise Pollution Control
Section, NPC 1 (Definitions, Severability and Variances
for Noise Pollution Control Regulations) and NPC 2 (Noise
Standards), adopted by the Minnesota Pollution Control
Agency and filed with the Secretary of State and Commis-
sioner of Administration on November 27, 1974, and all
rules, regulations and standards amendatory thereof or
supplementary thereto are hereby adopted for the purpose
of establishing the rules, regulations and noise standards
governing the limiting levels of sound established on the
basis of present knowledge for the preservation of public
health and welfare. Said rules, regulations and standards
shall be applicable to all zoning districts within the
City of Chanhassen; and all of said rules, regulations and
standards are hereby referred to, adopted, incorporated by
reference and made a part hereof as though fully set forth
in this ordinance.
Section 3. Effective Date. This ordinance shall become effective from
and after its passage and publication.
Passed by the Council this day of , 1977.
Attest:
City Clerk/Manager
Mayor
Public hearing held ., 1977.
Published in Carver County Herald on
1977.
CITY OF j
CHANHASSEN
7610 LAREDO DRIVEOP 0. BOX 1470CHANHASSEN, MINNESOTA 55317
(612) 474-8885
MEMORANDUM
TO: Mayor and City Council
FROM: City Manager, Don Ashworth
DATE: July 13, 1977
SUBJ: Administrative Presentations
0 Noise Ordinance: The city council previously approved
first reading of an amendment to the noise ordinance and provided
guidelines to the city attorney for preparation of the final draft.
Attached please find a copy of the proposed ordinance. This office
has forwarded this ordinance to the planning commission so that they
may hold a public hearing on such in accordance with the procedures
of the zoning ordinance. After consideration by the planning commission,
this item will be returned to the city council for final consideration
based upon planning commission comments, public hearing testimony,
and corrections or additions desired by the city council.
2. New Employment: Attached please find a copy of a
memorandum to the city treasurer concerning new employees which have
previously been considered by the city council and a listing of the
summer youth employees working for the City. In discussing work
completed by these employees with the various supervisors, I can
honestly state that we believe we have a very fine group of summer
youth employees to help the city in various departments. I would
like to state that I am very pleased with the work of Frances
Callahan in being able to obtain funding, interview and effeciently
place these kids in needed positions.
1
CITY OF CHANHASSEN
CARVER AND HENNEPIN COUNTIES, MINNESOTA
ORDINANCE NO. 47=I
AN ORDINANCE REPEALING SUBSECTION NO. 1, NOISE, OF
SECTION 12.07, PERFORMANCE STANDARDS, OF THE CHAN-
HASSEN ZONING ORDINANCE AND ADDING THERETO SECTION
19.20, NOISE STANDARDS.
THE CITY COUNCIL OF CHANHASSEN ORDAINS:
Section 1. Subsection No. 1, Noise, of Section 12.07, Performance
Standards, of Ordinance 47 entitled, "The Chanhassen Zoning Ordi-
nance", adopted February 8, 1972, is hereby repealed.
Section 2. Section 19 of Ordinance No. 47 entitled, "The Chan-
hassen Zoning Ordinance," adopted February 8, 1972, is hereby amended
by adding thereto the following subsection to read as follows:
19.20. Noise Standards.
a. Incorporation by Reference.
A certain document, a copy of which is on file in the
office of the City Clerk, marked "Official Copy, City of
Chanhassen" and designated as Noise Pollution Control
Section, NPC 1 (Definitions, Severability and Variances
for Noise Pollution Control Regulations) and NPC 2 (Noise
Standards), adopted by the Minnesota Pollution Control
Agency and filed with the Secretary of State and Commis-
sioner of Administration on November 27, 1974, and all
rules, regulations and standards amendatory thereof or
supplementary thereto.:are hereby adopted for the purpose
of establishing the rules, regulations and noise standards
governing the limiting levels of sound established on the
basis of present knowledge for the preservation of public
health and welfare. Said rules, regulations and standards
shall be applicable to the I-1 Industrial District and all
other zoning districts within the City of Chanhassen; and
all of said rules, regulations and standards are hereby
referred to, adopted, incorporated by reference and made a
part hereof as though fully set forth in this ordinance.
Section 3. Effective Date. This ordinance shall become effective
from and after its passage and publication.
Passed by the Council this day of
Attest:
MAYOR
City Clerk Manager
Public hearing held
1977.
1977.11
Published in Carver County Herald on the day of
1977.
MINNESOTA STATE
REGULATIONS
MINNESOTA POLLUTION
CONTROL AGENCY
NOISE POLLUTION CONTROL SECTION
1974
NPC 1 Definitions, Severa6iHty and V foe,
Noise Pollution Control ReguWoos
NPC 2 t Noma Standards
Filed with the Seery of State
and Comumiaetaner of Administration
November 27, 1974
Distributed by
DOCUMENTS SECTION, DEPARTMENT OF ADMINISTRATION
Room 140 Centennial Building, St. Paul, Minneaotet 55155
NPC 1 Definitions, Severability and Variances for Noise Pollution Control
Regulations
(a) Definitions. For the purpose of all noise pollution control regulations:
(1) Agency. Agency means the Minnesota Pollution Control Agency,
its agent, or representative.
(2) ANSI. ANSI means the American National Standards Institute or
its successor bodies.
(3) Director. Director means the Executive Director of the Minnesota
Pollution Control Agency.
(4) Daytime Hours. Daytime hours are those from 7:00 a.m. to 10:00
P.M. (0700-2200).
(5) Nighttime Hours. Nighttime hours are those from 10:00 p.m. to
7:00 a.m. (2200-0700).
(6) Person. Person means any human being, any municipality or other
governmental or political subdivision, or any other public agency,an
or private corporation, any partnership, firm, association or other orgapublic
niza-
tion, any receiver trustee, assignee, agent or other legal representative of any
of the foregoing, or any other legal entity, but does not include the Minne-
sota Pollution Control Agency.
(7) SLUCM. SLUCM means the Standard Land Use Coding Manual
(1969, United States Government Printing Office) which designates land
activities by means of numerical codes.
(8) Sound. Sound is an oscillation in pressure, stress, particle displace-
ment, particle velocity, etc., in an elastic or partially elastic medium, or the
superposition of such propagated alterations.
(9) Noise. Noise means any sound not occurring in the natural en-
vironment, including, but not limited to, sounds emanating from aircraft
and highways, and industrial, commercial and residential sources.
(10) Impulsive Noise. Either a single sound pressure peak (with
either a rise time less than 200 milliseconds or total duration less than 200
milliseconds) or multiple sound pressure peaks (with either rise times less
than 200 milliseconds or total duration less than 200 milliseconds) spaced
at least by 200 millisecond pauses.
(I1) Non -Impulsive Noise. All noise not included in the definition of
Impulsive Noise.
dB. (12) Decibel. Decibel is a unit of sound pressure level, abbreviated
(13) Sound Pressure Level (SPL). Sound Pressure Level is 20 times
the logarithm to the base 10 of the ratio of the pressure of a sound, p,
to the reference pressure, p,.. For the purposes of these regulations, the
reference pressure shall be 20 micronewtons per square meter (20 gN/mz).
In equation form, Sound Pressure Level in units of decibels is expressed as:
SPL (dB) = 20 Iog,,,p/Pr
(14) dBA. dBA is a unit of sound level. dBA is the weighted sound
pressure level by the use of the A metering characteristic and weighting as
specified in ANSI Specification for Sound Level Meters, SlA - 1971, which
is hereby incorporated by reference. For the purpose of these regulations,
dBA is used as a measure of human response to sound.
expressed in dBA, which is exceeded
,o is the sound level, sti r�ey+ as measured by
test procedures
�15) Lta. 1-
ten percent of thetorT a one hour dBA which is exceeded
approved by the A expressed in test proce-
level, p as measured by
(16) I,�. L� is the for sound
the time one hour survey,
fdty percent of the application
lures approved by the 1) reCtor. of any iegulation or such invalidity
if any provision is held to be invalid, the provisions
(b) Sevcrabllity. circumstances ,end to this end
ddecJared to be
erson or or application, ` thereof are
thereof to any P Provision applications
shall not hand the various Person
Of all regulationsapplication of the responsible p
severable. written app of exceptional circumstances
(c) Variance. whereupon b reason lation would cause
A ency finds that Y of any noise regu under
or persons, the g, rovisions impractical or not feh conditions
conformity with any unreasonable, imp on such
strict would be may permit a variance up the prevention,
undue hardship, the Agency it tnay prescribewi hfor
the intent of the
the circumstances, e limitations as. in harmony
and within, such time noise pollution
control or abattement Of cable Federal laws'
State and any pP
NPC 2 Noise Standards
(a) These standards describe the limiting levels of sound established on
the basis of present knowledge for the preservation of public health and
welfare. These standards are consistent with speech, sleep, annoyance and
hearing conservation requirements for receivers within areas grouped
according to land activities by the Noise Area Classification (NAC) system
herein described. However, these standards do not, by themselves, identify
the limiting levels of impulsive noise needed for the preservation of public
health and welfare.
(b) Noise Standards
Day (0700-2200) Night (2200-0700)
NAC L. L,.
1 60 65 50 55
2 65 70 65 70
3 75 80 75 80
(c) Noise Area Classification System According to Land Activity at Re-
ceiver. Acceptable sound levels for the receiver are a function of the in-
tended activity in that land area. The following noise area classifications
are grouped and defined by the SLUCM numerical codes and descriptions.
(d) Noise Area Classification-1 (NAC-1) includes the following land ac-
tivities:
NAC-1
11 Household units (includes farm houses)
12 Group quarters
13 Residential hotels
14 Mobile home parks or courts
15 Transient lodgings
19 Other residential, NEC*
397 Motion picture production
651 Medical and other health services
674 Correctional institutions
68 Educational services
691 Religious activities
71 Cultural activities and nature exhibitions
721 Entertainment assembly
7491 Camping and picnicking areas (designated)
75 Resorts and group camps
79 Other cultural, entertainment, and recreational activities, NEC
(e) Noise Area Classification-2 (NAC-2) includes the following land activi-
ties:
NAC-2
4113 Railroad terminals (passenger)
4115 Railroad terminals (passenger and freight)
4122 Rapid rail transit and street railway passenger terminal@
4211 Bus passenger terminals (intercity)
4212 Bus passenger terminals (local)
*NEC — Not elsewhere coded.
4213 Bus passenger terminals (intercity and local)
429 Other motor vehicle transportation, NEC
4312 Airport and flying field terminals (passenger)
4314 Airport and flying field terminals (passenger and freight)
4411 Marine terminals (passenger)
4413 Marine terminals (passenger and freight)
46 Automobile parking
4721 Telegraph message centers
492 Transportation services and arrangements
51 Wholesale trade
52 Retail trade — building materials, hardware, and farm equipment
53 Retail trade — general merchandise
54 Retail trade — food
55 Retail trade — automotive, marine craft, aircraft, and accessories
56 Retail trade — apparel and accessories
57 Retail trade — furniture, home furnishings, and equipment
58 Retail trade — eating and drinking
59 Other retail trade, NEC
61 Finance, insurance and real estate services
62 Personal services
63 Business services
64 Repair services
652 Legal services
659 Other professional services, NEC
66 Contract construction services
67 Governmental services (except 674)
69 Miscellaneous services (except 691)
72 Public assembly (except 721, 7223)
73 Amusements (except 731)
74 Recreational activities (except 7491)
76 Parks
(f) Noise Area Classification-3 (NAC-3) includes the following land activi-
ties:
NAC-3
21 Food and kindred products — manufacturing
22 Textile mill products — manufacturing
23 Apparel and other finished products made from fabrics, leather,
and similar materials — manufacturing
24 Lumber and wood products (except furniture) — manufacturing
25 Furniture and fixtures — manufacturing
26 Paper and allied products — manufacturing
27 Printing, publishing and allied industries
28 Chemicals and allied products — manufacturing
29 Petroleum refining and related industries
31 Rubber and miscellaneous plastic products — manufacturing
32 Stone, clay, and glass products — manufacturing
33 Primary metal industries
34 Fabricated metal products — manufacturing
35 Professional, scientific, and controlling instruments; photographic
and optical goods; watches and clocks — manufacturing
39 Miscellaneous manufacturing, NEC (except 397)
41 Railroad, rapid rail transit, and street railway transportation (ex-
cept 4113, 4115, 4122)
42 Motor vehicle transportation (except 4211, 4212, 4213, 429)
43 Aircraft transportation (except 4312, 4314)
44 Marine craft transportation (except 4411, 4413)
45 Highway and street right-of-way
47 Communication (except 4721)
48 Utilities
49 Other transportation, communication and utilities, NEC (except
492)
7223 Race tracks
731 Fairgrounds and amusement parks
81 Agriculture
82 Agricultural and related activities
83 Forestry activities and related services (including commercial
forest land, timber production and other related activities)
84 Fishing activities and related services
85 Mining activities and related services
89 Other resource production and extraction, NEC
— All other activities
(g) Noise Area Classification-4 (NAC-4) includes the following land activi-
ties:
NAC-4
91 Undeveloped and unused land area (excluding non-commercial
forest development)
92 Non-commercial forest development
93 Water areas
94 Vacant floor area
95 Under construction
99 Other undeveloped land and water areas, NEC
(h) Measurement Procedure. A measurement procedure approved by the
Director shall be used to determine the acceptability of sound levels in a
given area. Such measurements shall be made at the point of human activity
in the receiving area which is nearest the noise source and which is typical
for the Noise Area Classification category of the receiving area, except where
existing barriers, obstructions or reflecting surfaces prevent an accur.gt,.
measurement. All measurements shall be made outdoors.
(i) Exceptions
(1) The Standards of NAC-2 may apply to buildings within the follow-
ing NAC-1 categories: 11, 12, 13, 14, 15, 19, 397, 651, 68, 691, 71, 721, if
all of the following conditions are met:
(i) The building is constructed and insulated in such a way as to
assure that the exterior -interior sound level attentuation, measured under a
measurement procedure approved by the Director, is at least 30 dBA; and
(ii) The building possesses year -around indoor climate control; and
(iii) The building has no facilities intended for outdoor activities, in-
cluding but not limited to yards, swimming pools, patios, balconies, tennis
courts, golf course, gardens and picnic areas.
cate-
goriesndards
during nighttime hours in lieu ofmayapply
1y Night Standards if such land
uses are not intended for overnight sleeping.
Midavit of Publication
Sate of Minnesota )
) ss.
CITY OFCHANHASSEN
County of Carver )
CARVER AND HENNEPIN
COUNTIES, MINNESOTA
NOTICE OF PUBLIC HEARING
ON PROPOSED AMENDMENT TO CHANHASSEN
ZONING ORDINANCE TO INCLUDE MIN-
William Picuarry
NESOTA POLLUTION CONTROL AGENCY
being duly sworn, on oath says he is and during
NOISE STANDARDS
all the time herein stated has been the publisher and printer of the newspaper known as Carver County Herald and has full
NOTICE IS HEREBY GIVEN, That the Planning
knowledge of the facts herein stated as follows: (1) Said newspaper is printed in the English language in newspaper format
Commission of the City of Chanhassen will meet on
'Wednesday August 19o7, at 7: s0 o'clock at
and in column and sheet form equivalent in printed space to at least 900 square inches. (2) Said newspaper is a weekly
Ha,
the City Hall in said City for the purpose of holding a
City holding
and is distributed at least once a week. 3 Said news r has 50% of its news columns devoted to news of local interest
() ��
public hearing on a proposed amendment of the
to the community which it purports to serve and does not wholly duplicate any other publication and is not made up
Chanhassen Zoning Ordinance which would incorporate
entirely of patents, plate matter and advertisements. (4) Said newspaper is circulated in and near the municipality which
the Minn,sota Pollution Control Agency's Noise
Standards by reference.
it purports to serve, has at least 500 copies regularly delivered to paying subscribers, has an average of at least 75% of its
The proposed amendment would entail an amend-
total circulation currently paid or no more than three months in arrears and has entry as second-class matter in its local
ment of Section 12.07 Subdivision 1 of the Zoning Or-
post -office. (5) Said newspaper purports to serve the City of Chaska in the County of Carver and it has its known
dinance to incorporate the Pollution Control Agency's
office of issue in the City of Chaska in said county, established and open during its regular business hours for the
noise standards by reference.
gathering of news, sale of advertisements and sale of subscriptions and maintained by the managing officer of said
Copies of the Zoning Ordinance and the Chanhassen
newspaper, persons in its employ and subject to his direction and control during all such regular business hours and at
Zoning Nfav are available for public inspection at
which said newspaper is printed. (6) Said newspaper files a copy of each issue immediately with the State Historical
Chanhassen City Hall during regular business hours.
Society. (7) Said newspaper has complied with all the foregoing conditions for at least one year preceding the day or dates
All interested persons may appear and he heard at
said time and place.
of publication mentioned below. (8) Said newspaper has filed with the Secretary of State of Minnesota prior to January 1,
Dated: August 29, 1977
January p Y Lary of State and signed by the
1966 and each Jan 1 thereafter an affidavit in the form rescribed b the Secretary
BY ORDER OF THE
managing officer of said newspaper and sworn to before a notary public stating that the newspaper is a legal newspaper.
PLANNING COMMISSION
Bruce Psnkonin, City Planner
He further states on oath that the printed Arn A n d. N o i s e S t a n d
(P•-41ish in the Carver County Herald on August 91,
1977) —V'
hereto attached as a part
hereof was cut from the columns of said newspaper, and was printed and published therein in the English language,
once each week, for One successive weeks; that it was first so published on Wed • the 31 S t
day of AU'79__ 1977 and was thereafter printed and published on every to and
including the day of 19 and that the following is a printed copy of the lower case alphabet
from A to Z, both inclusive, and is hereby acknowledged as being the size and kind of type used in the composition and
publication of said notice, to wit:
abc defghi jklm nopgrstuvwxyz
Subscribed and sworn to before me this IS7I&ay of
(Notarial Seal)
LORRAINE LANO
NOTARY PUBLIC — MINNESOTA
`. CARVER COUNTY
My Commission Expires June 29, 1982
Popp
Notary public, CIOLM—L-f County, Minnesota
My Commission Expires 9 19�!Z
CITY OF CHANHASSEN
CARVER AND HENNEPIN COUNTIES, MINNESOTA
ORDINANCE NO. 47=I
AN ORDINANCE REPEALING SUBSECTION NO. 1, NOISE, OF
SECTION 12.07, PERFORMANCE STANDARDS, OF THE CHAN-
HASSEN ZONING ORDINANCE AND ADDING THERETO SECTION
19.20, NOISE STANDARDS.
THE CITY COUNCIL OF CHANHASSEN ORDAINS:
Section 1. Subsection No. 1, Noise, of Section 12.07, Performance
Standards, of Ordinance 47 entitled, "The Chanhassen Zoning Ordi-
nance", adopted February 8, 1972, is hereby repealed.
Section 2. Section 19 of Ordinance No. 47 entitled, "The Chan-
hassen Zoning Ordinance," adopted February 8, 1972, is hereby amended
by adding thereto the following subsection to read as follows:
19.20. Noise Standards.
a. Incorporation by Reference.
A certain document, a copy of which is on file in the
office of the City Clerk, marked "Official Copy, City of
Chanhassen" and designated as Noise Pollution Control
Section, NPC 1 (Definitions, Severability and Variances
for Noise Pollution Control Regulations) and NPC 2 (Noise
Standards), adopted by the Minnesota Pollution Control
Agency and filed with the Secretary of State and Commis-
sioner of Administration on November 27, 1974, and all
rules, regulations and standards amendatory thereof or
supplementary thereto.:are hereby adopted for the purpose
of establishing the rules, regulations and noise standards
governing the limiting levels of sound established on the
basis of present knowledge for the preservation of public
health and welfare. Said rules, regulations and standards
shall be applicable to (the I-1 Industrial District and)all
(other)zoning districts within the City of Chanhassen; and
all of said rules, regulations and standards are hereby
referred to, adopted, incorporated by reference and made a
part hereof as though fully set forth in this ordinance.
Section 3. Effective Date. This ordinance shall become effective
from and after its passage and publication.
Passed by the Council this
Attest:
City Clerk Manager
Public hearing held
day of 1977.
MAYOR --
11 1977.
Published in Carver County Herald on the day of
1977.
r
:a
s
MINNESOTA STATE
REGULATIONS
MINNESOTA POLLUTION
CONTROL AGENCY
NOISE -POLLUTION CONTROL SECTION
1974
NPC 1 D=ti= Severability and Variances for
Noise Poiladon Control Regaladone
NPC 21 Noise Standards
Filed with the 9erretary of State
and Commissioner of Administntlon
November 27, 1974
Diatributed by
DOCUMENTS SECTION, DEPARTMENT OF ADMINISTRATION
Room 140 Centennial Building, St. Paul, Mfnnesota 55155
.O,,.
NPC 1 Definitions, Severability and Variances For Noise Pollution Control
Regulations
(a) Definitions. For the purpose of all noise pollution control regulations:
(1) Agency. Agency means the Minnesota Pollution Control Agency,
its agent, or representative.
(2) ANSI. ANSI means the American National Standards Institute or
its successor bodies.
(3) Director. Director means the Executive Director of the Minnesota
Pollution Control Agency.
(4) Daytime Hours. Daytime hours are those from 7:00 a.m. to 10:00
P.M. (0700-2200).
(5) Nighttime Hours. Nighttime hours are those from 10:00 p.m. to
7:00 a.m. (2200-0700).
(6) Person. Person means any human being, any municipality or other
governmental or political subdivision, or any other public agency, any public
or private corporation, any partnership, firm, association or other organiza-
tion, any receiver trustee, assignee, agent or other legal representative of any
of the foregoing, or any other legal entity, but does not include the Minne-
sota Pollution Control Agency.
(7) SLUCM. SLUCM means the Standard Land Use Coding Manual
(1969, United States Government Printing Office) which designates land
activities by means of numerical codes.
(8) Sound. Sound is an oscillation in pressure, stress, particle displace-
ment, particle velocity, etc., in an elastic or partially elastic medium, or the
superposition of such propagated alterations.
(9) Noise. Noise means any sound not occurring in the natural en-
vironment, including, but not limited to, sounds emanating from aircraft
and highways, and industrial, commercial and residential sources.
(10) Impulsive Noise. Either a single sound pressure peak (with
either a rise time less than 200 milliseconds or total duration less than 200
milliseconds) or multiple sound pressure peaks (with either rise times less
than 200 milliseconds or total duration less than 200 milliseconds) spaced
at least by 200 millisecond pauses.
(11) Non -Impulsive Noise. All noise not included in the definition of
Impulsive Noise.
dB. (12) Decibel. Decibel is a unit Of sound pressure level, abbreviated
(13) Sound Pressure Level (SPL). Sound Pressure Level is 20 times
the logarithm to the base 10 of the ratio of the pressure of a sound, p,
to the reference pressure, pr. For the purposes of these regulations, the
reference pressure shall be 20 micronewtons per square meter (20 uN/m2).
In equation form, Sound Pressure Level in units of decibels is expressed as:
SPL (dB) = 20109111P/Pr
(14) dBA. dBA is a unit of sound level. dBA is the weighted sound
pressure level by the use of the A metering characteristic and weighting as
specified in ANSI Specification for Sound Level Meters, S1.4 - 1971, which
is hereby incorporated by reference. For the purpose of these regulations,
dBA is used as a measure of human response to sound.
H
expressed in dBA, which is
(15) L1�• L10 is tceeded
he sound level, as measured by test procedures
ten percent 01 the r or. a ppe hour surveys din dBA, which is exceeded
approved by as measured by test proce-
(16) Lam• L� is. the sound level, expressed
percent of the tme for a one hour survey,
fifty p elation or the application
roved by the Director. of any regulation such invalidity
dures approved if any provision be invalid, rovistons
(b) t to a b Pei licatio. and to this end the p
or ctrcumstances is.held to
Pelson or app the
are declared to be
thereof to any P provision lications
shall not affect nshaner d the various app person
of all reg responsible
severable* on written applicatioonf exceptional circumstances
Whereupon b reason noise e regulation would cause
(�i Variance. ency finds that y of any
or persons, the Ag, royisions ractical or not feasible it under
with any p fiance upon such conditions
strict conformity would be unreasonpelrmit a Variance the prevention,
undue hardship, the Agency. mays . rescribe for intent of the
limitations as it may p with the
the circumstsuchs time ollution in harmony
and withint of noise
control or abatemFederal laws.
State and any applicable
2
.0
NPC 2 Noise Standards
(a) These standards describe the limiting levels of sound established on
the basis of present knowledge for the preservation of public health and
welfare. These standards are consistent with speech, sleep, annoyance and
hearing conservation requirements for receivers within areas grouped
according to land activities by the Noise Area Classification (NAC) system
herein described. However, these standards do not, by themselves, identify
the limiting levels of impulsive noise needed for the preservation of public
health and welfare.
(b) Noise Standards
Day (0700-2200) Night (2200-0700)
NAC L. L,o L. L
1 60 65 50 55
2 65 70 65 70
3 75 80 75 80
(c) Noise Area Classification System According to Land Activity at Re-
ceiver. Acceptable sound levels for the receiver are a function of the in-
tended activity in that land area. The following noise area classifications
are grouped and defined by the SLUCM numerical codes and descriptions.
(d) Noise Area Classification-1 (NAC-1) includes the following land ac-
tivities:
NAC-1
11 Household units (includes farm houses)
12 Group quarters
13 Residential hotels
14 Mobile home parks or courts
15 Transient lodgings
19 Other residential, NEC*
397 Motion picture production
651 Medical and other health services
674 Correctional institutions
68 Educational services
691 Religious activities
71 Cultural activities and nature exhibitions
721 Entertainment assembly
7491 Camping and picnicking areas (designated)
75 Resorts and group camps
79 Other cultural, entertainment, and recreational activities, NEC
(e) Noise Area Classification-2 (NAC-2) includes the following land activi-
ties:
NAC-2
4113
Railroad terminals (passenger)
4115
Railroad terminals (passenger and freight)
4122
Rapid rail transit and street railway passenger terminals
4211
Bus passenger terminals (intercity)
4212
Bus passenger terminals (local)
*NEC — Not elsewhere coded.
.e
4213 Bus passenger terminals (intercity and local)
429 Other motor vehicle transportation, NEC
4312 Airport and flying field terminals (passenger)
4314 Airport and flying field terminals (passenger and freight)
4411 Marine terminals (passenger)
4413 Marine terminals (passenger and freight)
46 Automobile parking
4721 Telegraph message centers
492 Transportation services and arrangements
51 Wholesale trade
52 Retail trade — building materials, hardware, and farm equipment
53 Retail trade — general merchandise
54 Retail trade — food
55 Retail trade — automotive, marine craft, aircraft, and accessories
56 Retail trade — apparel and accessories
57 Retail trade — furniture, home furnishings, and equipment
58 Retail trade — eating and drinking
59 Other retail trade, NEC
61 Finance, insurance and real estate services
62 Personal services
63 Business services
64 Repair services
652 Legal services
659 Other professional services, NEC
66 Contract construction services
67 Governmental services (except 674)
69 Miscellaneous services (except 691)
72 Public assembly (except 721, 7223)
73 Amusements (except 731)
74 Recreational activities (except 7491)
76 Parks
(f) Noise Area Classification-3 (NAC-3) includes the following land activi-
ties:
NAC-3
21 Food and kindred products — manufacturing
22 Textile mill products — manufacturing
23 Apparel and other finished products made from fabrics, leather,
and similar materials — manufacturing
24 Lumber and wood products (except furniture) — manufacturing
25 Furniture and fixtures — manufacturing
26 Paper and allied products — manufacturing
27 Printing, publishing and allied industries
28 Chemicals and allied products — manufacturing
29 Petroleum refining and related industries
31 Rubber and miscellaneous plastic products — manufacturing
32 Stone, clay, and glass products — manufacturing
33 Primary metal industries
34 Fabricated metal products — manufacturing
35 Professional, scientific, and controlling instruments; photographic
and optical goods; watches and clocks — manufacturing
39 Miscellaneous manufacturing, NEC (except 397)
41 Railroad, rapid rail transit, and street railway transportation (ex-
cept 4113, 4115, 4122)
42 Motor vehicle transportation (except 4211, 4212, 4213, 429)
43 Aircraft transportation (except 4312, 4314)
44 Marine craft transportation (except 4411, 4413)
45 Highway and street right-of-way
47 Communication (except 4721)
48 Utilities
49 Other transportation, communication and utilities, NEC (except
492)
7223 Race tracks
731 Fairgrounds and amusement parks
81 Agriculture
82 Agricultural and related activities
83 Forestry activities and related services (including commercial
forest land, timber production and other related activities)
84 Fishing activities and related services
85 Mining activities and related services
89 Other resource production and extraction, NEC
— All other activities
(g) Noise Area Classification-4 (NAC-4) includes the following land activi-
ties:
NAC-4
91 Undeveloped and unused land area (excluding non-commercial
forest development)
92 Non-commercial forest development
93 Water areas
94 Vacant floor area
95 Under construction
99 Other undeveloped land and water areas, NEC
(h) Measurement Procedure. A measurement procedure approved by the
Director shall be used to determine the acceptability of sound levels in a
given area. Such measurements shall be made at the point of human activity
inthe receiving area which is nearest the noise source and which is typical
for the Noise Area Classification category of the receiving area, except where
existing barriers, obstructions or reflecting surfaces prevent an accurate
measurement. All measurements shall be made outdoors.
(i) Exceptions
(1) The Standards of NAC-2 may apply to buildings within the follow-
ing NAC-1 categories: 11, 12, 13, 14, 15, 19, 397, 651, 68, 691, 71, 721, if
all of the following conditions are met:
(i) The building is constructed and insulated in such a way as to
assure that the exterior -interior sound level attentuation, measured under a
measurement procedure approved by the Director, is at least 30 dBA; and
(ii) The building possesses year -around indoor climate control; and
(iii) The building has no facilities intended for outdoor activities, in-
cluding but not limited to yards, courts, golf course, gardens and picswimming pools, patios, balconies, tennis
nic area&
ards
gories2during nighttime hours in lieu ofaNAapply Night Standards ifto land uses in such land
uses are not intended for overnight sleeping.
CITY OF
CHANHASSEN
7610 LAREDO DRfVE*P.O BOX 1479CHANHASSEN, MINNESOTA 55317
(612) 474-8885
MEMORANDUM
DATE: July 21, 1977
TO: Planning Commission and Staff
FROM: Bruce Pankonin, City Planner
SUBJ: Proposed Noise Ordinance
Attached hereto for your consideration and review, is a proposed
noise ordinance, incorporating the Minnesota Pollution Control Agency's
noise standards into local -ordinance.
As of this writing, I do not understand the technicalities of the
attached, however, I will contact the Minnesota Pollution Control
Agency, prior. to Wednesday night's meeting and hopefully, ascertain
what all of this means.
RUSSELL H. LARSON
CRAIG M. MCRT2
RUSSELL H. L.A1teoN
ATTORNEY AT LAW
1900 FIRST NATIONAL BANK BUILDING
MINNEAPOLIS, MINNESOTA 55402
July 19, 1977
Mr. Donald W. Ashworth
Chanhassen City Manager
Box 147
Chanhassen, Minnesota 55317
Re: Noise Ordinance
Dear Don:
AREA CODE 612
TELEPHONE 336-9565
Ref: Zoning Amendments
Our initial draft of proposed Ordinance No. 47-1 should be changed
to read as shown on the attached revised draft.
You may also wish to consider that the noise regulations be made
applicable to all public bodies of water which lie wholly or
partially within the City. In such case, the last sentence of
Section 19.20 should read:
"Said rules, regulations and standards shall be
applicable to all zoning districts within the City
of Chanhassen, including all public bodies of water
which lie wholly or partially therein; and all of
said rules, regulations and standards are hereby
referred to, adopted, incorporated by reference, and
made a part hereof as though fully set forth in this
ordinance."
t
trul urs,
RUSSELL H. LARSON
Chanhassen City Attorney
RHL:mep
Encl.
cc: Bruce Pankonin, City Planner
JUL1977
RECEIVED
wu.AOR or.
CNANHASMN.
_ MINN.
CITY OF CHANHASSEN
CARVER AND HENNEPIN COUNTIES, MINNESOTA
ORDINANCE NO. 47-I
AN ORDINANCE REPEALING SUBSECTION NO. 1, NOISE, OF
SECTION 12.07, PERFORMANCE STANDARDS, OF THE CHAN-
HASSEN ZONING ORDINANCE AND ADDING THERETO SECTION
19.20, NOISE STANDARDS.
THE CITY COUNCIL OF CHANHASSEN ORDAINS:
Section 1. Subsection No. 1, Noise, of Section 12.07, Performance
Standards, of Ordinance 47 entitlea, u-The Chanhassen Zoning Ordinance"
adopted February 8, 1972, is hereby repealed.
Section 2. Section 19 of Ordinance No. 47 entitled, "The Chan-
hassen Zoning Ordinance," adopted February 8, 1972, is hereby amended
by adding thereto the following subsection to read as follows:
19.20. Noise Standards.
a. Incorporation by Reference.
A certain document, a copy of which is on file in the
office of the City Clerk, marked "Official Copy, City of
Chanhassen" and designated as Noise Pollution Control
Section, NPC 1 (Definitions, Severability and Variances
for Noise Pollution Control Regulations) and NPC 2 (Noise
Standards), adopted by the Minnesota Pollution Control
Agency and filed with the Secretary of State and Commis-
sioner of Administration on November 27, 1974, and all
rules, regulations and standards amendatory thereof or
supplementary thereto are hereby adopted for the purpose
of establishing the rules, regulations and noise standards
governing the limiting levels of sound established on the
basis of present knowledge for the preservation of public
health and welfare. Said rules, regulations and standards
shall be applicable to all zoning districts within the
City of Chanhassen; and all of said rules, regulations and
standards are hereby referred to, adopted, incorporated by
reference and made a part hereof as though fully set forth
in this ordinance.
Section 3. Effective Date. This ordinance shall become effective from
and after its passage and publication.
Passed by the Council this day of , 1977.
Attest: Mayor
City Clerk/Manager
Public hearing held , 1977.
Published in Carver County Herald on _, 1977.