2.
Response
to
Comments
2.9
Individual
Responses
to
Comments
from
Organizations
Restoring
rail
access
from
the
Roundhouse
building
to
the
main
line
is
not
proposed.
While
laying
track
within
the
building
could
be
part
of
its
rehabilitation,
such
details
regarding
the
ultimate
design
of
Roundhouse
restoration
are
not
available.
See
Standard
construction
and
grading
practices
with
the
potential
to
cause
vibration
damage
to
historic
structures
include
pile
driving,
drilling,
and
trenching
using
heavy
earthmoving
equipment,
and
vibratory
(dynamic)
compaction.
These
activities
generally
attenuate
ground-borne
vibration
to
a
less-than-significant
threshold
beyond
25
feet
from
their
sources,
according
to
accepted
standards
8
.
Draft
EIR
Mitigation
Measure
4.J-2b,
Pre-Construction
Assessment
to
Minimize
Structural
Pile-Driving
Vibration
Impacts
on
Adjacent
Historic
Buildings
and
Structures
and
Vibration
Monitoring
,
requires
that
any
development
within
85
feet
of
the
Roundhouse
solicit
a
pre-
construction
assessment
and
implement
recommendations
from
a
qualified
geotechnical
engineer
before
a
building
permit
is
issued.
If
recommended
by
the
pre-construction
assessment,
nearby
historic
structures
including
the
Roundhouse
would
be
monitored
for
groundborne
vibrations.
The
combination
of
natural
attenuation
of
groundborne
vibration
at
distances
greater
than
25
feet,
and
the
conservative
implementation
of
pre-construction
evaluations
and
mitigation
for
construction
within
85
feet
of
the
Roundhouse
as
specified
in
Mitigation
Measure
4.J-2b
would
reduce
any
construction-related
impacts
to
the
Roundhouse
to
a
less-than-significant
level.
Please
also
see
Draft
EIR
Section
4.J,
Noise
and
Vibration,
for
discussions
of
groundborne
vibration
impacts.
See
Mitigation
Measure
4.D-1a
requires
preparation
of
a
stabilization
plan
for
the
Roundhouse
building
to
be
prepared
and
approved
by
the
City
prior
to
approval
of
the
first
grading
or
building
permit
within
the
Baylands,
to
be
implemented
immediately
upon
approval
of
that
first
grading
or
building
permit.
The
presence
of
wetlands
at
the
roundhouse
are
discussed
on
page
4.C-9
of
the
Draft
EIR,
which
states,
“freshwater
emergent
wetland
habitat
is
found
within
the
former
rail
yard
area
in
the
middle
of
the
property
and
at
the
center
of
the
roundhouse
structure
where
the
turntable
once
operated.
The
depression
within
which
the
turntable
would
have
rotated
accumulates
water
runoff
and
has
developed
wetland
vegetation.”
Figure
4.c-1
has
been
updated
to
depict
the
location
of
this
wetland,
which
was
discussed
in
the
text
but
inadvertently
omitted
from
the
graphic.
8
Wilson,
Ihrig
&
Associates,
Inc.
et
al
,
Current
Practices
to
Address
Construction
Vibration
and
Potential
Effects
to
Historic
Buildings
Adjacent
to
Transportation
Projects
,
September,
2012.
Brisbane
Baylands
Final
EIR
2.9.2-71
May
2015