§
308(
e)

*
*
*
*

(
3)
A
State
which
opts
under
40
CFR
51.308(
e)(
2)
to
implement
an
emissions
trading
program
or
other
alternative
measure
rather
than
to
require
sources
subject
to
BART
to
install,
operate,
and
maintain
BART
may
satisfy
the
final
step
of
the
demonstration
required
by
that
section
by
conducting
dispersion
modeling
to
determine
the
visibility
impact
of
the
trading
alternative.
The
dispersion
modeling
should
determine
differences
in
visibility
between
BART
and
the
trading
program
for
each
impacted
Class
I
area,
for
the
worst
and
best
20
percent
of
days.
The
modeling
should
identify
the
estimated
difference
from
future
baseline
visibility
conditions
under
the
two
approaches
for
each
Class
I
area,
and
the
average
difference
in
visibility
over
all
Class
I
areas
impacted
by
the
region's
emissions.
The
modeling
would
demonstrate
"
greater
reasonable
progress"
if
both
of
the
following
two
criteria
are
met:
­­
visibility
does
not
decline
in
any
Class
I
area,
and
­­
there
is
an
overall
improvement
in
visibility,
determined
by
comparing
the
average
differences
over
all
affected
Class
I
areas.

(
4)
A
State
that
opts
to
participate
in
the
Clean
Air
Interstate
Rule
cap­
and­
trade
and
trade
program
under
part
96
AAA
 
EEE
need
not
require
affected
BART­
eligible
EGU's
to
install,
operate,
and
maintain
BART.
A
State
that
chooses
this
option
may
also
include
provisions
for
a
geographic
enhancement
to
the
program
to
address
the
requirement
under
§
51.302(
c)
related
to
BART
for
reasonably
attributable
impairment
from
the
pollutants
covered
by
the
CAIR
cap­
and­
trade
program.

(
5)
After
a
State
has
met
the
requirements
for
BART
or
implemented
emissions
trading
program
or
other
alternative
measure
that
achieves
more
reasonable
progress
than
the
installation
and
operation
of
BART,
BART­
eligible
sources
will
be
subject
to
the
requirements
of
§
51.308(
d)
in
the
same
manner
as
other
sources.

(
6)
Any
BART­
eligible
facility
subject
to
the
requirement
under
§
51.308(
e)
to
install,
operate,
and
maintain
BART
may
apply
to
the
Administrator
for
an
exemption
from
that
requirement.
An
application
for
an
exemption
will
be
subject
to
the
requirements
of
§
51.303(
a)(
2)
 
(
h).
