2.
Response
to
Comments
2.9
Individual
Responses
to
Comments
from
Organizations
forecasted,
it
will
need
to
be
taken
into
account
in
relation
to
remedial
technologies
and
monitoring.
As
a
result,
additional
mitigation
measures
as
requested
in
this
comment
are
not
necessary.
“Undocumented
fill”
refers
to
fill
materials
that
were
placed
without
record
of
their
compaction
level
and
therefore
are
generally
assumed
to
be
relatively
loose
and
more
susceptible
to
settlement
and
erosion.
The
potential
for
erosion
is
reduced
when
exposed
soils
are
covered
with
concrete
or
other
impervious
surfaces
largely
because
they
are
no
longer
exposed
to
the
effects
of
wind
and
water.
As
stated
on
Draft
EIR
page
4.E-36,
“the
foundation
system
for
each
building
site
within
the
Baylands
must
be
designed
in
accordance
with
the
site-specific
engineering
properties
of
the
materials
beneath
the
proposed
structure,
combined
with
the
intended
loading
(weight)
of
the
proposed
structure.”
This
holds
true
for
areas
where
liquefaction
hazards
are
present
as
well
as
other
seismic
hazards.
Therefore,
with
implementation
of
Draft
EIR
Mitigation
Measure
4.E-2a,
a
site-specific
geotechnical
approach
would
be
required
for
developments
where
pilings
are
not
recommended.
Standard
geotechnical
approaches
can
include
replacing
liquefiable
soils
with
engineered
fill,
treatment
of
soils,
dynamic
compaction,
or
even
soil-cement
mixing
where
cement
grout
is
injected
into
the
ground.
These
can
all
be
effective
at
minimizing
the
potential
for
liquefaction.
As
to
the
potential
for
corrosion,
evaluating
soils
for
corrosion
potential
would
be
included
as
part
of
final
design-level
site-specific
geotechnical
evaluations.
All
subsurface
improvements
including
deep
foundation
systems
such
as
pilings
would
also
be
evaluated
for
potential
corrosion
and
designed
to
ensure
that
potential
damage
from
corrosion
is
minimized.
The
text
on
page
of
the
Draft
EIR
is
part
of
a
description
of
the
history
of
the
Baylands
Project
Site,
and
is
not
intended
to
describe
either
present
conditions
or
future
activities.
Section
3.2.2
of
the
Draft
EIR
starting
on
page
describes
areas
subject
to
remediation
and
landfill
closure.
Proposed
remedial
actions,
including
landfill
closure
are
described
in
Section
3.11,
Remedial
Actions
,
starting
on
page
including
a
description
of
landfill
closure
procedures.
The
closure
of
the
former
landfill
is
discussed
in
detail
in
Section
4.G
Hazards
and
Hazardous
Materials
of
the
Draft
EIR.
Section
4.E,
Geology,
Soils,
and
Seismicity
,
describes
the
geology,
soils,
and
the
seismicity
of
the
Project
Site
and
vicinity.
It
also
analyzes
and
evaluates
the
impacts
of
Project
site
development
to
those
resource
areas,
specifically,
geology,
soils,
and
seismicity.
The
paragraph
on
page
4.E-33
of
the
Draft
EIR
under
the
heading
“San
Mateo
County
Health
System
–
Solid
Brisbane
Baylands
Final
EIR
2.9.3-54
May
2015