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DEe 2 1 1982
CA:RHH:SSS
City Council Meeting 12-21-82
Santa Monica, California
STAFF REPORT
TO: Mayor and City Council
FROM: City Attorney
SUBJECT: Re-Enactment of Airport Noise Limit
At its December 14, 1982 meeting, the City Council
directed the City Attorney to prepare an ordinance reinstating
the Single Event Noise Exposure Level (SENEL) limit of 100
decibels (dB) on aircraft using the Santa Monica Airport. The
accompanying ordinance effectuates this direct1on. Th1s or-
dinance is 1dentical to the 100 declbel SENEL limit which was
adopted by the Council for a six month period in January,
1982.
RECOMMENDATION
It is respectfully recommended that the accompanying or-
dinance be introduced for first read1ng.
Prepared By: Robert M. Myers, City Attorney
Stephen S. Stark, Assistant C1ty Attorney
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DEe 2 1 1982
I
CA:RMM:SSS
City Council Meeting 12-21-82
Santa Monica, California
ORDINANCE No.
(City Council Series)
AN ORDINANCE OF THE CITY COUNCIL
OF THE CITY OF SANTA HORICA
TO ESTABLISH AN AIRPORT
NOISE LIMIT OF 100 SENEL
THE CITY COUNCIL OF THE CITY OF SANTA MONICA DOES ORDAIN
AS FOLLOWS:
SECTION 1. Section 10105B of the Santa Monica Municipal
Code is hereby amended to read as follows:
Section
1010SB.
Aircraft
Noise
Restrictions
for
the
Santa
Monica
Municipal Alrport.
(a)
Prohib1tion
And
Remed y fa r
Repeated Violation.
An aircraft taking
off from or land1ng at the A~rport shall
not be operated 1n violation of this
section.
A person who violates this
section
more
than once may, at the
discretion of the Airport Director and
after
belng
given
notice
and
an
opportunity to be heard, be prohib1ted
from using the Airport for a period not to
exceed
180
days,
except
upon such
conditions as the Alrport Director may
prescribe.
The remedy provided in this
1
subsection shall be supplemental
other remedy provided by law.
violation subsequent to the
to any
Each
first
violation
remediable.
(b) Definitions. Each of the terms
shall
be
specifically
as used in this section shall be defined
as follows:
(1) Sound pressure level (SPL): The
sound pressure level, in decibels (dB), of
a sound is twenty times the logarithm to
the base 10 of the ratio of the pressure
of this sound to the reference sound
pressure. The reference pressure shall be
20 micropascals (20 micronewtons per
square meter, or 0.0002 nicrobar).
(2) Noise level (~L): The noise
level, ln decibels, is an A-weighted sound
pressure level as neasured using the slow
dynamic characteristics for sound level
meters specified in the Amerlcan National
Standard Specification for Sound Level
Meters, ANSI Sl.4-1971 (or latest revision
thereof.). The A-weighting
characteristics modifies the frequency
response of the measuring instrument to
account approximately for the frequency
2
characteristics of the human ear. The
reference pressure is 20 micropascals.
(3) Noise Level Maximum (NLM): The
maximum NL reached during an aircraft
noise occurrence. This is synonymous with
the unit "dBAll" as found in FAR-36, Part
36, Appendix F.
(4) Noise exposure level (NEL): The
noise exposure level ln decibels is the
noise accumulated during a given event.
More specifically, the noise exposure
level 1S the level of the time-lntegrated
A-weighted sound pressure for a stated
time interval or event, based on a
reference pressure of 20 micropascals and
a reference duration of one second.
(5) ?}ngle
level (SENEL):
event noise exposure
The single event noise
exposure level, 1n decibels, is the noise
exposure level of a single event, such as
an aircraft flyby, measured over the time
lnterval between the initial and final
times for which the noise levels of a
slngle
level.
Section,
be 65 NL.
event exceeds the threshold nOlse
For
implementation
of
this
the threshold noise level shall
3
(6) California A1rport N01se
Standards: The California Airport Noise
Standards are defined in the Californ1a
Division of Aeronaut1cs "Noise Standards~,
Californ1a Adm1nistrative Code, T1tle 21,
Subchapter 6, (Register 79, No. 21, May
26, 1979), or latest revisions thereof.
(7) A1rcraft Operator: Aircraft
operator means the legal or beneficial
owner of the aircraft with author1ty to
control the aircraft ut11ization: except
where the aircraft 1S leased, the lessee
1S the operator. Aircraft operator also
means the pilot of an a1rcraft.
(8) C1ty: City means the City of
Santa Monica.
(9) A1rport: Airport means the
Santa Monica Municipal A1rport.
(10) A1rcraft Model: A1rcraft Model
means
a verSlon of an aircraft that
requires or if now nanufactured would
require
rules.
(c) Methodology. The noise levels
generaten by aircraft takeoffs or aircraft
landings at the Airport are to be ~easured
at one or More positions in the vicinity
noise certification under FAA
4
of the Alrport. The measurements shall be
in terms of the SENEL. The measured SEMEL
values are to be compared with noise level
limits established by this Section. An
aircraft operator whose a1rcraft produces
noise levels which exceed the SENEL limits
shall be deemed to be in vlolation of this
Section.
(d) Measurement Locations.
MeasureMents
shall be made at ground
pos1tlons on or near the center line of
nominal takeoff and landing flight tracks
for aircraft operating from the Airport.
The nominal flight track is a line
projected on the ground under the nominal
flight path of the aircraft. Measurement
positions shall be established by the City
at a position 1500 feet from the east and
1500 feet from the west end of the runway.
Additional measurement positions may be
established as needed to carry out the
purpose of this Section.
(e) !.Eequency of Heasurement. At
each established microphone location,
single
event
noise
exposure
level
measurements shall be made on a schedule
to be established by the C1ty.
5
(f) ~9ise Monitoring System Speci-
fications. The noise monitoring sys tem
shall measure the single event noise
exposure level of noise events exceeding
the noise threshold established at each
measurement posi tion and shall log the
time of occurrence of each event. The
performance of the noise monitoring system
shall meet the requ1rements established in
Noise Standards, as amended. In general
the overall accuracy of the noise
measurement system shall be +1.5 dBAs
determ1ned in accordance with the
procedures specified in Section 5080.3 of
the Ca11farnia Airport N01se Standards, as
amended.
(g) Fleld Measurement Precautions.
Specific locations of the monitoring
systems shall be chosen, whenever
possible, such that the noise levels
contributed from sources other than
aircraft shall be equal to or less than
60dB. The measurement microphone shall be
placed 20 feet above the ground level or
at least 10 feet from the neighboring
rooftops, wh1chever is higher. To the
6
extent pract1cal, the following
precautions should be followed:
(1) Each monitor1ng location shall
be in an open area surrounded by
relatively flat terrain having no excesive
sound absorption character~stics such as
may be caused by thick tall grass,
shrubbery or wooded areas.
(2) No obstructions which would
signlficantly influence the sound field
from the aircraft shall exist within the
con1cal
space
above
the measurement
position, the cone be~ng defined by an
axis along the line of sight normal to the
aircraft and by a half angle of 75 degrees
from th~s axis.
(3) ~~en the foregoing precautions
are not pract~cal, the microphone shall be
placed at least 10 feet above neighborlng
buildings in a position which has a clear
line-of-sight view to the path of the
aircraft in flight.
(h) Max~mum Allowable Single Event
Noise Level (SENEL). The City shall set
noise level limits for each of the
established measurement positions. For
the noise monltor stations specified in
7
subsection
(d)
above,
the
maximum
permissible SENEL shall be 100 Decibels.
SECTION 2. Any provision of the Santa Monica Municipal
Code or appendices thereto inconsistent with the provisions of
this ordinance, to the extent of such inconsistencies and no
furthe r ,
are hereby repealed or modified to that extent
necessary to affect the provisions of this ordinance.
SECTION
3.
If any section,
subsection,
sentence,
clause, or phrase of this ordinance is for any reason held to
be invalid or unconstitutional by a decision of any court of
any competent jurisdiction, such decision shall not affect the
valid1ty of the remaining portions of the ordinance. The City
Council hereby declares that it would have passed this
ordinance and each and every section, subsection, sentence,
clause or phrase not declared 1nvalid or unconstltutional
w1thout regard to whether any portion of the ordinance would
be subsequently declared invalid or unconstitutional.
SECTION 4.
The Mayor shall sign and the City Clerk
shall attest to the passage of thlS ordinance. This City
Clerk shall cause the same to be published once in the
official newspaper within 15 days after its adoption. The
ordinance shall become effectlve after 30 days from its
adopt1on.
APPROVED AS TO FORM:
~ -. "'rr-
Robert M. Myers "
City Attorney
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