O1267
e e
CA:RMM:SSS
City Council Meeting 1-11-83 Santa Monica, California
ORDINANCE No. lZ67(CCS)
(City Council Series)
AN ORDINANCE OF THE CITY COUNCIL
OF THE CITY OF SANTA MONICA
TO ESTABLISH AN AIRPORT
NOISE LIMIT OF 100 SEMEL
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 10105B.
Aircraft Noise
Restrictions for the Santa Monica
MuniciFal Airport.
(a) Prohibition And Remedy for
Repeated Violation.
An aircraft taking
off from or landing at the Airport shall
not be operated in violation of this
section.
A person who violates this
section more than once may, at the
dlscretion of the Airport Director and
after being given notice and an
opportunity to be heard, be prohibited
from using the Airport for a period not to
exceed 180 days, except upon such
condit ions as the Airport Director may
prescribe. The remedy provided in this
1
e
e
subsection shall be supplemental to any
other remedy provided by law. Each
violation subsequent to the first
violation shall be specifically
remediable.
(b) Definitions.
Each of the terms
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 microbar).
(2) Noise level (NL): The noise
level, ln decibels, is an A-weighted sound
pressure level as measured using the slow
dynamic characteristics for sound level
meters speClfied in the American 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
e
e
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 unlt IdBAM" as found in FAR-36, Part
36, Appendix F.
(4) Noise exposure level (NEL): The
noise exposure level in decibels is the
noise accumulated during a given event.
More specifically, the noise exposure
level is the level of the time-integrated
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) Sinsle
level (SENEL):
event noise exposure
The single event noise
exposure level, in decibels, is the noise
exposure level of a single event, such as
an alrcraft flyby, measured over the time
interval between the initial and final
times for which the nOlse levels of a
single event exceeds the threshold noi se
level. For implementation of this
Section, the threshold noise level shall
be 65 NL.
3
e
e
(6) California Airport Noise
Standards: The Callforn1a Airport Noi se
Standards are defined in the California
Division of Aeronautics "Noise Standards",
California Administrative Code, Title 21,
Subchapter 6 I (Register 79, No. 21, May
26, 1979), or latest revisions thereof.
(7) Aircraft Operator: Aircraft
operator means the legal or beneficial
owner of the aircraft with authori ty to
control the aircraft utilization; except
where the aircraft is leased, the lessee
is the operator. Aircraft operator also
means the pilot of an aircraft.
(8) City: City means the City of
Santa Monica.
(9) Airport: Airport means the
Santa Monica Municipal Airport.
(10) Aircraft Model: Aircraft Model
means a version of an aircraft that
requires or if now manufactured would
require noise cert~fication under FAA
rules.
(c) Methodolo~y. The noise levels
generated by aircraft takeoffs or aircraft
landings at the Airport are to be measured
at one or more positions in the vicinity
4
e
-
of the Airport. The measurements shall be
in terms of the SENEL. The measured SENEL
values are to be compared with noise level
limits established by this Section. An
aircraft operator whose aircraft produces
noise levels which exceed the SENEL limits
shall be deemed to be in violation of this
Section.
(d) Measurement Locations.
Measurements shall be made at ground
posi tions 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 posi tions may be
established as needed to carry out the
purpose of this Section.
(e) Frequency of Measurement. At
each established microphone location,
single event noise exposure level
measurements shall be made on a schedule
to be established by the City.
5
e
.
(f) Noise Monitorin9 System Speci-
fications. The noise monitoring system
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 requirements established in
Noise Standards, as amended. In general
the overall accuracy of the noise
measurement system shall be +1.5 dBAs
determined in accordance with the
procedures specified in Section 5080.3 of
the California Airport Noise Standards, as
amended.
(g) Field 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 neighbor ing
rooftops, whichever lS higher. To the
6
e
e
extent practical, the following
precautions should be followed:
(1) Each monitoring location shll
be in an open area surrounded by
relatively flat terrain having no exceSlve
sound absorption characteristics such as
may be caused by thick tall grass,
shrubbery or wooded areas.
(2) No obstructions
which would
significantly influence the sound fi eld
from the aJ.rcraft shall exist wi thin the
conical space above the measurement
position, the cone being defined by an
axis along the line of sight normal to the
aircraft and by a half angle of 75 degrees
from this axis.
(3) When the foregoing precautJ.ons
are not practical, the microphone shall be
placed at least 10 feet above neighboring
buildings in a position which has a clear
line-of-sight view to the path of the
aircraft in flight.
(h) Maximum Allowable Sin91e Event
Noise Level (SENEL). The City shall set
noise level limits for each of the
established measurement posi tions . For
the noise monitor stations specified in
7
e
e
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
further, are hereby repealed or modified to that extent
necessary to affect the provisions of thlS 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
validity 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 invalid or unconstitutional
without 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 this ordinance.
This City
Clerk shall cause the same to be published once in the
official newspaper wlthin 15 days after its adoption. The
ordinance shall become effective after 30 days from lts
adoption.
APPROVED AS TO FORM:
~-.~'"
R?bert M. Myers
Clty Attorney
8
"', '"
It
e
ADOPTED AND APPROVED THIS
11th
DAY
OF
January
f
~ 1 98 1.
;/1
{
MAYOR
I HEREBY CERTIFY THAT THE FOREGOING ORDINANCE,
NO. l267 (CCS), WAS DULY AND REGULARLY INTRODUCED AT A
MEETING OF THE CITY COUNCIL ON THE 21st DAY OF December
1982; THAT THE SAID ORDINANCE WAS THEREAFTER DULY ADOPTED
AT A MEETING OF THE CITY COUNCIL ON THEllth DAY OF January
1983 BY THE FOLLOWING COUNCIL VOTE:
NOES:
COUNCILMEMBERS: Connt Edwards, Jennin~st Press,
Reed, Zane and Mayor Yannatta
Goldway
COUNCILMEMBERS: ~one
AYES:
ABSENT:
COUNCILMEMBERS: None
ABSTAIN:
COUNCILMEMBERS: ~one
ATTEST:
r~
CLERK