2.
Response
to
Comments
2.9
Individual
Responses
to
Comments
from
Organizations
techniques
that
could
result
in
vibrations
of
0.25
in/sec
to
engage
a
qualified
geotechnical
engineer,
subject
to
City
approval,
to
conduct
a
pre-construction
assessment
of
existing
subsurface
conditions
and
the
structural
integrity
of
the
nearby
historic
structures
subject
to
pile-driving
or
other
vibration-inducing
activity
before
a
building
permit
is
issued
to
demonstrate
that
the
proposed
construction
activities
would
not
result
in
vibration-induced
damage
to
the
Roundhouse
building.
The
Draft
EIR
text
referred
to
in
Comment
describes
the
methodology
used
to
analyze
vibration
impacts.
Analysis
of
human
annoyance
impacts
from
construction-related
vibration
is
presented
on
pages
4.J-23
and
4.J-24
of
the
Draft
EIR
and
was
determined
to
be
less-than-significant.
Draft
EIR
page
4.J-16
to
which
the
comment
refers
presents
the
methodology
for
assessing
construction-related
noise
impacts.
Noise
impacts
related
to
construction
activity
are
presented
on
Draft
EIR
pages
4.J-31
through
4.J-34.
This
analysis
addresses
existing
offsite
noise-sensitive
uses
nearest
the
proposed
demolition
and
construction
activity
including
the
residents
of
the
Mission
Blue
Drive
development,
residents
on
San
Francisco
and
Santa
Clara
Streets
in
Brisbane,
residents
on
Linda
Vista
Drive
and
MacDonald
Street
in
Daly
City,
and
residents
on
Desmond
Street
and
in
the
Little
Hollywood
neighborhood
in
San
Francisco.
The
northeast
ridge
of
Brisbane
is
located
over
4,000
feet
from
the
Project
Site
development
area
and
therefore
more
distant
sites
such
as
this
were
not
included
in
the
noise
monitoring
effort.
The
following
analysis
is
a
demonstration
of
why
more
distant
sites
were
not
included.
As
stated
on
page
4.J-33
of
the
Draft
EIR,
pile
driving
noise
of
103
dBA
at
the
southern
end
of
the
project
site
would
be
attenuated
to
73
dBA
at
the
nearest
receptor
1,600
feet
away.
At
a
distance
of
4,000
feet
where
Kings
Road
exists,
the
noise
would
be
further
attenuated
to
65
dBA.
The
Draft
EIR
does
not
identify
pile-driving
noise
as
a
“nuisance”
impact.
The
only
reference
in
the
Draft
EIR
to
a
“nuisance”
noise
impact
is
on
Draft
EIR
page
4.J-36,
which
addresses
aircraft
noise.
Planning
for
acceptable
noise
exposure
takes
into
account
the
types
of
activities
and
corresponding
noise
sensitivity
in
a
specified
location
for
a
generalized
land
use
type.
Some
general
guidelines
are
as
follows:
sleep
disturbance
can
occur
at
levels
above
35
dBA;
interference
with
human
speech
begins
at
about
60
dBA;
and
hearing
damage
can
result
from
prolonged
exposure
to
noise
levels
in
excess
of
85
to
90
dBA
(USEPA,
1974).
Brisbane
Baylands
Final
EIR
2.9.2-115
May
2015