Jason
Burnett/
DC/
USEPA/
US
03/
14/
2006
03:
29
PM
T
o
darbuckl@
omb.
eop.
gov
c
c
Marcus
Peacock/
DC/
USEPA/
US@
EPA,
wehrum.
bill@
epa.
gov@
EPA,
Arthur_
G._
Fraas@
omb.
eop.
gov
S
u
b
j
e
c
t
CAIR
ozone
significance
test
Dear
Dr.
Arbuckle,
Marcus
asked
me
to
follow
up
with
you
on
a
question
that
I
understand
came
out
of
your
conversation
earlier
today
regarding
the
screening­
level
significance
test
for
ozone
in
the
Clean
Air
Interstate
Rule
(
CAIR).

As
part
of
the
significance
test,
we
look
at
linkages
between
upwind
states
and
downwind
nonattainment
areas.
If
a
linkage
is
determined
potentially
significant
based
on
the
screening­
level
test,
we
perform
a
zero­
out
and
source
apportionment
test
to
determine
the
significance
of
the
upwind
contribution.
Below
I
have
listed
the
linkages
that
were
determined
potentially
significant
based
on
the
screening­
level
test
but
then
found
not
significant
based
on
the
other
tests.

Listed
as
upwind
state
(
downwind
nonattainment
area):
West
Virginia
(
Middlesex,
CT)
Maryland
(
Middlesex,
CT)
West
Virginia
(
Washington,
DC)
Virginia
(
Fulton,
GA)
Michigan
(
Harford,
MD)
Massachusetts
(
Suffolk,
NY)
New
York
(
Chester,
PA)
New
York
(
Montgomery,
PA)
West
Virginia
(
Arlington,
VA)

Please
note,
however,
that
each
of
these
upwind
states
are
included
in
the
ozone
part
of
CAIR
due
to
the
significance
of
other
linkages.
Also
note
that
based
on
our
modeling
a
significant
number
of
linkages
(
about
50)
that
failed
the
screen
would
have
passed
the
zero­
out
and
source
apportionment
test
had
those
tests
been
performed
for
those
linkages
but
no
additional
states
would
be
included.
Marcus
said
that
he
will
be
calling
you
later
this
afternoon
to
follow
up
on
this
information.

Respectfully,
Jason
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
Jason
K.
Burnett
(
Office)
202.564.2028
(
Fax)
202.501.0986
(
Cell)
202.468.5344
burnett.
jason@
epa.
gov
