2.
Response
to
Comments
2.9
Individual
Responses
to
Comments
from
Organizations
Page
4.D-25,
Impact
Assessment
Methodology,
notes
that
many
mapping
sources
were
used,
including
historic
aerial
and
topographic
maps
of
Brisbane
from
1946
to
2005.
The
year
1946
is
the
earliest
year
that
is
available
to
researchers
using
online
aerial
photography
and
topographic
maps
of
the
Baylands
Project
Site.
Other,
earlier
maps
were
also
consulted,
as
described
in
the
same
section,
such
as
the
1915
San
Mateo
USGS
Quadrangle,
and
the
1906
Coast
and
Geodetic
Survey
Nautical
Chart
of
San
Francisco
Bay.
Please
also
see
Draft
EIR
page
(
Figure
,
Former
Railyard
Site
Over
Time),
which
shows
the
location
of
former
railroad
structures
on
historic
topographic
maps
from
to
1915
to
1995.
Standard
construction
and
grading
practices
with
the
potential
to
cause
vibration
damage
to
historic
structures
include
pile
driving,
drilling,
and
trenching
using
heaving
earthmoving
equipment,
and
vibratory
compaction.
The
effects
of
groundborne
vibration
on
buildings
are
discussed
on
page
4.J-22
of
Section
4.J,
Noise
and
Vibration
,
of
the
Draft
EIR.
As
explained
in
that
Section,
the
nearest
existing
offsite
structure
(the
7
Mile
House)
that
could
be
affected
by
Project
Site
development-related
pile
driving
is
located
360
feet
from
planned
high-rise
locations
(which
are
areas
where
pile-driving
is
expected).
At
this
distance,
pile-driving
vibration
would
be
well
below
the
threshold
(25
feet)
of
architectural
damage
for
both
modern
and
historic
and
older
buildings.
No
significant
vibration
with
the
potential
to
affect
this
historic
resource
would
occur,
and
therefore
no
vibration
testing
or
monitoring
would
be
necessary.
The
comment
is
correct
in
inferring
that
geological
coring
is
a
technique
often
used
by
archaeologists
to
test
for
the
presence
or
absence
of
archaeological
deposits
in
subsurface
strata.
The
Draft
EIR
does
not
include
specific
text
on
use
of
core
sampling
for
archaeological
testing
as
sampling
would
not
be
required
due
to
the
low
archaeological
sensitivity
of
the
Baylands
Project
Site.
Draft
EIR
Figure
illustrates
the
dates
of
historic
fill
at
the
Baylands
site.
Figure
identifies
remediation
areas
at
the
Baylands
site,
one
of
which
is
called
the
Former
Landfill.
The
use
of
the
term
“Landfill”
in
Figure
describes
a
specific
period
of
time
during
which
waste
materials
were
discarded
into
the
Former
Landfill
area
shown
on
the
map;
the
use
of
the
term
“fill”
in
Figure
describes
all
artificial
filling
that
occurred
in
the
Baylands
site
vicinity.
Site
hazards
related
to
liquefaction,
including
discussion
of
liquefaction
at
the
former
railyard,
are
included
in
Draft
EIR
Section
4.E,
Geology,
Soils,
and
Seismicity
,
pages
4.E-27
through
4.E-28.
No
changes
to
the
Draft
EIR
have
been
made.
Brisbane
Baylands
Final
EIR
2.9.3-50
May
2015