2.
Response
to
Comments
2.9
Individual
Responses
to
Comments
from
Organizations
See
All
structures
within
the
former
landfill
area
will
be
required
to
be
provided
with
foundations
meeting
applicable
CBC
requirements,
including
resistance
to
potential
subsidence.
As
described
above
in
Response
differential
settlement
has
been
clearly
identified
as
a
potential
hazard
at
the
Baylands
site
for
all
proposed
improvements.
Requirements
for
proposed
roadways
and
sidewalks
would
be
included
as
part
of
site-specific
design
level
geotechnical
reports
and
recommendations
provided
for
site
preparation
to
ensure
that
these
improvements
are
protected
from
substantial
damage
as
a
result
of
differential
settlement.
In
general,
roadways
and
sidewalks
represent
much
lighter
loading
as
compared
to
multi-story
structures
and
typically
do
not
require
the
same
amount
of
site
preparations.
Pursuant
to
Mitigation
Measure
4.E-2a,
all
roadways
and
sidewalks
to
be
constructed
on
the
Baylands
site
would
be
evaluated
for
all
geotechnical
hazards
including
settlement
and
differential
settlement
at
such
time
as
specific
locations
and
engineering
designs
for
such
roadways
are
proposed.
All
roadways
and
sidewalks
would
receive
appropriate
geotechnical
site
preparations
such
as
use
of
engineered
fill,
compaction
requirements,
and
surcharging
as
well
as
other
design
features
including
hinged
slabs
such
that
the
impacts
from
differential
settlement
would
be
less
than
significant.
“Deep
dynamic
compaction”
is
a
geotechnical
method
of
increasing
the
density
of
underlying
materials
such
that
new
loadings
(e.g.,
placement
of
fill
or
construction
of
a
building)
can
be
adequately
supported.
The
process
involves
dropping
of
a
heavy
weight
repeatedly
on
the
ground
at
regularly
spaced
intervals.
The
weight
used
and
the
height
from
which
it
is
dropped
depends
on
the
degree
of
compaction
desired.
This
technique
is
widely
used
in
a
variety
of
areas
including
dense
urban
development
such
as
is
proposed
in
the
Baylands
development
scenarios.
Prior
to
commencement
of
any
deep
dynamic
compaction
activities
that
may
be
proposed,
a
site
specific
geotechnical
investigation
as
required
by
Draft
EIR
Mitigation
Measure
4.E-2a
would
be
undertaken
to
provide
a
detailed
understanding
of
the
underlying
materials
and
recommendations
for
site
preparation
methods.
These
recommendations
would
be
in
accordance
with
industry
standard
practices
and
building
code
standards
that
are
subject
to
review
by
the
City
Engineer,
and
would
be
required
to
be
implemented
as
part
of
site
preparation
and
grading.
Deep
dynamic
compaction
is
not
the
only
option
available
for
building
foundation
design
and
would
only
be
employed
where
appropriate
as
determined
by
site-specific
data
following
review
and
approval
by
the
City
building
official.
Brisbane
Baylands
Final
EIR
2.9.2-75
May
2015