2.
Response
to
Comments
2.9
Individual
Responses
to
Comments
from
Organizations
from
construction
of
the
CPP
or
CPP-V
scenario
would
therefore
be
considered
a
less-than-significant
impact.
Construction
noise
is
of
a
temporary
nature,
whereas
roadway
noise
is
permanent.
Data
used
for
assessment
of
construction
noise
impacts
from
pile
driving
were
derived
from
the
U.S.
Department
of
Transportation’s
document
Transit
Noise
and
Vibration
Impact
Assessment
.
This
document
identifies
noise
levels
from
a
variety
of
construction
equipment
at
a
reference
distance
of
50
feet.
For
pile
driving
this
reference
vibration
level
is
101
dBA
at
50
feet.
Applying
a
noise
propagation
equation
of
L
q
(
equip
)
=
L(
ref
)
–
20
log(D/50)
results
in
a
noise
level
of
73
dBA
at
1,600
feet.
The
reference
to
high-volume
roadway
traffic
on
Draft
EIR
page
4.J-33
comes
from
the
City
of
San
Francisco’s
Citywide
Noise
Map
available
at
https://www.sfdph.org/dph/files/EHSdocs/ehsPublsdocs/Noise/noisemap2.pdf,
which
shows
portions
of
Geneva
Avenue
in
excess
of
70
dBA
as
well
as
numerous
roadway
sections
throughout
San
Francisco.
With
regard
to
Brisbane
General
Plan
Policy
176
(minimize
the
intrusion
of
unwarranted
and
intrusive
noise
on
community),
Mitigation
Measure
4.J-4a
of
the
Draft
EIR
includes
a
measures
to
implement
“quiet”
pile-driving
technology
(such
as
pre-drilling
of
piles
and
the
use
of
more
than
one
pile
driver
to
shorten
the
total
pile
driving
duration),
where
feasible,
in
consideration
of
geotechnical
and
structural
requirements
and
conditions.
The
intent
of
this
measure
is
to
minimize
the
intrusion
of
unwarranted
and
intrusive
noise
on
the
community
generated
by
pile
driving,
consistent
with
Policy
176.
With
regard
to
General
Plan
Policy
183
(Coordinate
land
uses
and
construction
conditions
to
minimize
noise
impacts
of
the
Caltrain
corridor
and
major
highway
arterials
on
adjacent
land
uses),
Mitigation
Measure
4.J-4a
of
the
Draft
EIR
includes
several
measures
intended
to
coordinate
construction
conditions
to
minimize
noise
impacts.
General
Plan
Policy
184,
in
conjunction
with
development
applications
and
other
land
use
decisions,
considers
the
potential
for
noise
generation
from,
as
well
as
noise
impacts
on,
the
project
or
area),
is
addressed
within
the
five
impact
statements
and
analysis
contained
in
Draft
EIR
Section
4.J,
Noise
and
Vibration
.
As
discussed
in
the
Response
BCC-
411,
the
shape
of
the
terrain
in
Brisbane
and
the
slope
of
the
valley
means
that
homes,
like
seats
in
an
amphitheater,
have
a
“good
view”
of
noise
sources.
This
means
that
noise
will
propagate
better
than
in
a
typical
flat
community
because
buildings
are
less
likely
to
intercept
the
line-of-sight
to
a
noise
source.
Because
the
noise
predictions
in
the
Draft
EIR
do
not
assume
any
acoustical
shielding
by
intervening
buildings,
they
are
therefore
appropriate
for
the
analysis,
given
Brisbane
Baylands
Final
EIR
2.9.2-125
May
2015