2.
Response
to
Comments
2.9
Individual
Responses
to
Comments
from
Organizations
anchoring
piles
and
shorter
structures
may
not
need
exploratory
borings
to
go
as
deep
in
order
to
design
a
foundation
system
that
can
adequately
support
the
proposed
structure.
Therefore,
the
particulars
of
each
geotechnical
investigation
would
be
dependent
on
proposed
site
and
building
designs,
but
each
investigation
would
be
required
to
be
consistent
with
industry
standard
practices,
conducted
by
a
state
licensed
geotechnical
engineer,
in
accordance
with
current
building
code
requirements,
and
subject
to
review
and
oversight
by
the
City
Engineer
and
Building
Official.
See
also
for
a
discussion
of
prevention
of
cross
contamination.
“Failure”
in
this
context
refers
to
the
risk
that
proposed
fill
slopes
could
move
in
unwanted
ways
as
a
result
of
new
loadings
(e.g.
placement
of
new
fills,
or
construction
of
new
structures,
etc.)
placed
on
the
relatively
soft
compressible
Bay
Mud
deposits
underlying
the
Baylands
Project
Site.
These
clay
deposits
can
still
be
relatively
impermeable
to
the
vertical
movement
of
water
and
yet
not
capable
of
supporting
proposed
improvements,
as
these
are
separate
forces
at
work.
Draft
EIR
Mitigation
Measure
4.E-4b
requires
that
slope
stability
evaluations
be
included
as
part
of
site
specific
geotechnical
evaluations
that
would
include
measures
to
prevent
any
slope
failures
in
accordance
with
building
code
requirements.
With
implementation
of
this
mitigation
measure,
the
potential
for
slope
failure
would
be
reduced
to
less
than
significant.
See
also
5
for
a
discussion
of
the
applicability
of
building
code
requirements
and
applicability
of
compliance
with
the
law
as
mitigation.
See
for
a
discussion
of
prevention
of
cross
contamination.
]
“
Consolidation”
refers
to
the
reduction
in
volume
of
a
soil
unit
when
a
stress
load
(such
as
fill
or
a
building)
is
placed
on
top
of
it.
A
soil
is
said
to
be
“overconsolidated”
when
the
stress
loa
d
at
some
point
in
its
history
exceeds
the
current
stress
load.
The
degree
of
consolidation
of
clay
layers
has
the
effect
of
changing
the
calculated
responses
to
new
loadings
that
might
be
associated
with
placement
of
new
fills
and/or
structures.
Overconsolidated
layers
would
likely
experience
relatively
little
settlement
unless
new
loadings
in
excess
of
its
historical
maximum
are
placed
on
it.
Therefore,
the
implications
are
that
proposed
development
of
the
Baylands
would
be
required
to
be
designed
in
accordance
with
a
site-specific
design
level
geotechnical
evaluation
that
has
adequately
profiled
underlying
conditions
to
ensure
that
the
improvements
can
be
sufficiently
supported
over
the
design
life
of
onsite
buildings.
See
for
discussion
of
the
remediation
review
and
approval
process
and
for
discussion
of
cross-contamination.
As
discussed
in
the
use
of
any
specific
remediation
method
or
technology
has
not
been
approved
Brisbane
Baylands
Final
EIR
2.9.1-25
May
2015