2.
Response
to
Comments
2.9
Individual
Responses
to
Comments
from
Organizations
has
not
been
documented.
The
shallow
groundwater
gradient
has
been
identified
as
easterly
towards
San
Francisco
Bay
and
southerly
towards
Brisbane
Lagoon;
however
the
shallow
groundwater
has
not
been
documented
as
being
in
communication
with
the
San
Francisco
Bay.
The
groundwater
contour
maps
delineating
groundwater
gradients
or
flow
direction
were
generated
using
known
data
points
and
computer
software
programs
that
use
the
measured
elevations
of
groundwater
in
the
groundwater
monitoring
wells,
as
well
as
depth
to
groundwater.
The
computer
software
model
then
mapped
contours
of
modeled
changes
across
the
site
where
none
have
been
measured,
based
on
the
nearest
measured
point.
As
such,
the
groundwater
contour
maps
accurately
reflect
groundwater
elevations
within
the
Baylands.
The
concept
of
a
groundwater
contour
map
is
to
provide
information
based
on
modeled
probability
with
regard
to
groundwater
gradient.
Maps
showing
groundwater
sampling
sites
at
the
site
provide
information
regarding
the
location
of
the
sampling
points
relative
to
the
site.
See
Response
These
maps
are
not
intended
to
provide
all
of
the
information
requested
in
the
comment.
Such
information
cannot
be
realistically
presented
in
a
graphic
placed
in
a
two-
dimensional
document.
Available
information
for
the
items
requested
in
this
comment
is,
however,
provided
in
the
text
of
the
Draft
EIR,
as
well
as
in
Appendices
H.2
and
H.3.
Depth
of
Young
and
Old
Bay
Mud.
See
Table
4.E-1
on
Draft
EIR
page
4.E-4.
Constituents
tested;
how
often
tested?
The
constituents
tested
within
the
Baylands
are
summarized
in
the
Draft
EIR
on
pages
4.G-23
through
4.G-25.
More
detailed
information
on
testing
within
the
landfill
is
presented
in
Appendix
H.2.
More
detailed
information
on
testing
within
Ou-1
and
is
presented
in
Appendix
H.3.
Location
of
tire
piles
within
the
landfill.
Appendix
H,
page
1542.
Photograph
5
on
that
page
indicates
the
location
of
the
tire
piles
being
in
the
northwestern
quadrant
of
the
former
landfill.
Maps
that
provide
a
visual
and
3-dimensional
history
of
the
underlying
conditions.
The
overall
history
of
the
filling
of
San
Francisco
Bay
to
create
the
Baylands
is
addressed
on
page
4.E-1
and
illustrated
in
Figure
4.E-1.
The
section
referenced
in
this
comment
summarizes
the
groundwater
gradient
as
reported
by
other
consultants
Brisbane
Baylands
Final
EIR
2.9.1-43
May
2015