1Section
182(
b)(
3)
specifies
that
EPA
would
approve
any
request
from
a
State
to
reclassify
to
a
higher
classification.
Technical
Support
Document
for
LaPorte
County,
Indiana
September
2004
1.0
Summary
On
July
15,
2004,
Lori
F.
Kaplan,
Indiana
Department
of
Environmental
Management
Commissioner
and
Governor's
designee,
submitted
a
request
to
reclassify
LaPorte
County
from
Moderate
ozone
nonattainment
to
Marginal
ozone
nonattainment.
The
petition
is
based
on
the
area's
Moderate
design
value
of
93
ppb
being
within
5%
of
the
maximum
Marginal
design
value
of
91
ppb
as
allowed
by
the
Clean
Air
Act.

2.0
Introduction
This
section
describes
the
statutory
provisions
and
EPA
guidance
regarding
reclassification
of
ozone
nonattainment
areas.
Sections
181(
a)(
4)
and
182(
b)(
3)
of
the
Clean
Air
Act
provide
that
areas
may
be
reclassified
under
certain
circumstances.
This
technical
support
document
addresses
the
provisions
of
section
181(
a)(
4)
and
a
specific
request
for
reclassifications
received
by
the
State
of
Indiana.
The
EPA
has
not
received
any
requests
for
reclassification
under
section
182(
b)(
3)
for
the
8­
hour
ozone
standard.
1
Under
section
181(
a)(
4),
an
ozone
nonattainment
area
may
be
reclassified
"
if
an
area
classified
under
paragraph
(
1)
(
Table
1)
would
have
been
classified
in
another
category
if
the
design
value
in
the
area
were
5
percent
greater
or
5
percent
less
than
the
level
on
which
such
classification
was
based."
In
the
April
30,
2004
notice,
we
indicated
that
an
area
with
a
moderate
design
value
of
96
ppb
(
or
less)
would
be
eligible
to
request
a
bump
down
because
five
percent
less
than
96
ppb
is
91
ppb,
a
marginal
design
value.

The
EPA
previously
described
criteria
to
implement
the
section
181(
a)(
4)
provisions
in
a
final
rule
designating
and
classifying
areas
published
on
November
6,
1991
(
56
FR
56698).
As
stated
in
that
notice,
the
provisions
of
section
181(
a)(
4)
set
out
general
criteria
and
grant
the
Administrator
broad
discretion
in
making
or
determining
not
to
make,
a
reclassification.
As
part
of
the
1991
action,
EPA
developed
more
specific
criteria
to
evaluate
whether
it
is
appropriate
to
reclassify
a
particular
area.
The
EPA
also
described
these
criteria
in
the
April
30,
2004
final
­
2
­

rule.
The
general
and
specific
criteria
are
as
follows:

General:
The
EPA
may
consider
the
number
of
exceedances
of
the
national
primary
ambient
air
quality
standard
for
ozone
in
the
area,
the
level
of
pollution
transport
between
the
area
and
other
affected
areas,
including
both
intrastate
and
interstate
transport,
and
the
mix
of
sources
and
air
pollutants
in
the
area.

Request
by
State:
The
EPA
does
not
intend
to
exercise
its
authority
to
bump
down
areas
on
EPA's
own
initiative.
Rather,
EPA
intends
to
rely
on
the
State
to
submit
a
request
for
a
bump
down.
A
Tribe
may
also
submit
such
a
request
and,
in
the
case
of
a
multi­
state
nonattainment
area,
all
affected
States
must
submit
the
reclassification
request.

Discontinuity:
A
five
percent
reclassification
must
not
result
in
an
illogical
or
excessive
discontinuity
relative
to
surrounding
areas.
In
particular,
in
light
of
the
areawide
nature
of
ozone
formation,
a
reclassification
should
not
create
a
"
donut
hole"
where
an
area
of
one
classification
is
surrounded
by
areas
of
higher
classification.

Attainment:
Evidence
should
be
available
that
the
proposed
area
would
be
able
to
attain
by
the
earlier
date
specified
by
the
lower
classification
in
the
case
of
a
bump
down.

Emissions
reductions:
Evidence
should
be
available
that
the
area
would
be
very
likely
to
achieve
the
appropriate
total
percent
emission
reduction
necessary
in
order
to
attain
in
the
shorter
time
period
for
a
bump
down.

Trends:
Near­
and
long­
term
trends
in
emissions
and
air
quality
should
support
a
reclassification.
Historical
air
quality
data
should
indicate
substantial
air
quality
improvement
for
a
bump
down.
Growth
projections
and
emission
trends
should
support
a
bump
down.
In
addition,
we
will
consider
whether
vehicle
miles
traveled
and
other
indicators
of
emissions
are
increasing
at
higher
than
normal
rates.

Years
of
data:
For
the
8­
hour
ozone
standard,
the
2001­
2003
period
is
central
to
determining
classification.
Data
from
2004
may
be
used
to
corroborate
a
bump
down
request
but
should
not
be
the
sole
foundation
for
the
bump
down
request.

Limitations
on
Bump
Downs
­
3
­

An
area
may
only
be
reclassified
to
the
next
lower
classification.
An
area
cannot
present
data
from
other
years
as
justification
to
be
reclassified
to
an
even
lower
classification.
In
addition,
section
181(
a)(
4)
does
not
permit
moving
areas
from
subpart
2
into
subpart
1.

In
1991,
EPA
approved
reclassifications
when
the
area
met
the
first
requirement
(
a
request
by
the
State
to
EPA)
and
at
least
some
of
the
other
criteria
and
did
not
violate
any
of
the
criteria
(
emissions,
reductions,
trends,
etc.).
In
our
April
30,
2004
final
rule
on
designations
and
classifications,
we
stated
our
intention
to
use
this
method
and
these
criteria
once
again
to
evaluate
reclassification
requests
under
section
181(
a)(
4),
with
minor
changes
described
in
that
notice.
In
that
notice
we
also
described
how
we
applied
these
criteria
in
1991.
For
additional
information,
see
section
5,
"
Areas
requesting
a
5%
downshift
per
§
181(
a)(
4)
and
EPA's
response
to
those
requests,"
of
the
Technical
Support
Document,
October
1991,
for
the
1991
rule.
[
Docket
A­
90­
42A.]

The
EPA
is
not
basing
this
reclassification
determination
on
consideration
of
whether
the
nonattainment
area
being
reclassified
does
or
does
not
cause
any
pollution
transport.
The
EPA
is
presently
addressing
ozone
pollution
transport
issues
throughout
the
eastern
part
of
the
United
States
under
other
Clean
Air
Act
provisions.
Specifically,
EPA
has
proposed
a
determination
that
emissions
from
certain
states
contribute
significantly
to
downwind
nonattainment
for
ozone
under
CAA
section
110(
a)(
2)(
D)
through
the
Clean
Air
Interstate
Rule
(
CAIR).
The
CAIR
proposal,
published
in
a
Federal
Register
notice
dated
January
30,
2004,
would
require
upwind
States
to
eliminate
emissions
that
contribute
significantly
to
nonattainment
in
downwind
States.
69
Fed.
Reg.
454566.
The
EPA
previously
issued
the
NOx
SIP
call
(
63
FR
57356)
to
address
interstate
ozone
transport.
In
the
event
of
any
intrastate
transport
issue,
states
have
the
obligation
to
develop
attainment
SIPs
for
each
area
that
show
timely
attainment,
and
can
address
any
intrastate
transport
issues
in
that
context.

The
April
30,
2004
notice
invited
States
to
submit
the
reclassification
requests
within
30
days
of
the
effective
date
of
the
designations
and
classifications.
The
effective
date
was
June
15
which
means
that
reclassification
requests
were
to
be
submitted
by
July
15,
2004.
This
relatively
short
time
frame
is
necessary
because
section
181(
a)(
4)
only
authorizes
the
Administrator
to
make
such
reclassifications
within
90
days
after
the
initial
classification,
September
15,
2004.
­
4
­

3.0
Background
LaPorte
County
is
highly
impacted
by
transport
due
to
the
Lake
Michigan
ozone
phenomenon.
LaPorte
County
has
few
major
sources.
EPA
designated
this
area
as
Moderate
due
to
high
8­
hour
values
(
design
value
is
93
ppb)
and
1­
hour
values
(
135
ppb).

4.0
Reclassification
Request
by
State
The
State
argues
that
LaPorte
County
should
receive
a
reclassification
from
Moderate
to
Marginal.
The
demonstration
is
based
on
modeling
showing
progress
towards
attainment
by
the
Marginal
attainment
date
(
2007),
identification
of
the
ozone
transport
problem
in
the
area,
and
a
demonstration
of
less
than
one
percent
of
contribution
from
local
sources.

5.0
EPA
Review
of
the
Reclassification
Request
5.1
Request
by
State
The
request
was
submitted
by
Lori
F.
Kaplan,
Commissioner
of
the
Indiana
Department
of
Environmental
Management.
The
IDEM
Commissioner
is
the
Governor's
designee.

5.2
Discontinuity
If
LaPorte
County
is
reclassified
from
Moderate
to
Marginal,
this
will
not
result
in
a
discontinuity
or
"
donut
hole."
The
only
area
that
is
adjacent
to
Laporte
County
that
has
a
higher
classification
is
the
Chicago­
Gary
moderate
nonattainment
area.
All
of
the
other
counties
immediately
bordering
LaPorte
County
are
either
designated
as
attainment
or
are
Subpart
1
nonattainment.

5.3
Attainment
The
Lake
Michigan
Air
Directors
Consortium
(
LADCo)
used
modeling
results
performed
to
support
the
1­
hour
ozone
attainment
demonstration
for
the
Lake
Michigan
area
and
applied
8­
hour
ozone
metrics.
As
noted
in
Michigan's
petition,
the
LADCo
modeling
was
designed
to
assess
1­
hour
ozone
and,
as
such,
there
are
some
limitations
with
using
it
to
assess
8­
hour
ozone.
On
the
other
hand,
it
should
be
noted
that
three
of
the
four
modeled
episodes
are
representative
periods
for
high
8­
hour
ozone
and
basecase
model
performance
for
8­
hour
ozone
was
found
to
be
as
good
as
(
or
better
than)
that
for
1­
hour
ozone
(
page
7
of
the
IDEM
&
LADCo
July
2004
"
Photochemical
Modeling
Analysis
of
8­
Hour
Ozone
for
LaPorte
County").
The
local
scale
LADCo
modeling
indicates
that
­
5
­

2Engine
manufacturers
will
have
flexibility
to
meet
the
new
standards
through
a
phase­
in
approach
between
2007
and
2010.
The
fuel
provision
will
go
into
effect
in
June
2006
and
will
be
phased­
in
through
2009.
air
quality
is
expected
to
improve
(
from
93
to
89
ppb)
in
LaPorte
County,
but
may
not
reach
attainment
in
2007.
Since
this
modeling
was
performed
before
the
Heavy
Duty
Engine
rule
was
proposed,
it
does
not
reflect
emission
reductions
from
that
national
program.
2
Use
of
a
more
recent
emission
inventory
and
base
design
value
would
likely
result
in
lower
predicted
concentrations.

Additional,
regional
scale,
modeling
from
the
CAIR
proposal
indicates
the
area
will
be
in
attainment
(
84
ppb)
by
2010.
The
CAIR
modeling,
however,
was
not
designed
to
provide
results
for
years
prior
to
2010.

In
summary,
EPA
believes
the
LADCo
and
CAIR
modeling
analyses
are
not
conclusive
with
respect
to
LaPorte's
attainment
status
in
2007.
Although
neither
analysis
is
as
comprehensive
an
assessment
as
would
be
expected
with
a
SIP
attainment
demonstration,
they
do
provide
support
for
a
decision
to
reclassify
the
area.
Both
modeling
analyses
indicate
air
quality
will
be
improving
over
the
next
several
years.

5.4
Emissions
Reductions
Because
this
area
is
so
heavily
impacted
by
transported
pollution
from
upwind
areas,
it
would
be
difficult
to
show
that
reductions
from
the
area
will
help
to
achieve
the
area's
earlier
attainment
date.
It
can
be
expected
that
ozone
values
will
continue
to
decrease
due
to
the
implementation
of
various
rules
such
as
the
NOx
SIP
Call,
Tier
II/
Low
Sulfur,
Heavy
Duty
Diesel
Engine
standards/
low
sulfur
diesel,
and
other
national
rules.
In
addition,
implementation
of
emission
reductions
contained
in
1­
hour
ozone
attainment
plans
in
the
Lake
Michigan
area
will
further
reduce
emissions.

Other
voluntary
measures
being
implemented
in
the
Lake
Michigan
area
include:

°
Schoolbus,
nonroad
vehicle
and
garbage
truck
diesel
retrofit
programs
°
Alternative
fuel
fleets
°
Gas
can
replacement
programs
°
Lawmower
buyback
programs
°
Educational
outreach
programs
and
ozone
action
days
­
6
­

3The
ozone
values
for
the
2004
ozone
season
through
September
1
and
are
preliminary.
5.5
Trends
A
short­
term
analysis
does
shows
a
large
decrease
in
the
4th
high
ozone
values
at
both
the
Michigan
City
monitor
and
the
City
of
LaPorte
monitor.

4th
High
Ozone
Values
in
LaPorte
County
Michigan
City
City
of
LaPorte
2002
107
ppb
100
ppb
2003
82
ppb
84
ppb
20043
68
ppb
71
ppb
Further,
it
can
be
expected
that
ozone
values
will
continue
at
these
lower
levels
due
to
the
implementation
of
various
rules
such
as
the
NOx
SIP
Call,
Tier
II/
Low
Sulfur,
Heavy
Duty
Diesel
Engine
standards/
low
sulfur
diesel,
and
other
national
rules.
In
addition,
implementation
of
emission
reductions
contained
in
1­
hour
ozone
attainment
plans
in
the
Lake
Michigan
area
will
further
reduce
emissions
and
improve
air
quality.

5.6
Years
of
Data
The
design
values
are
2001­
2003
values.
In
2003
and
2004,
Michigan
City
and
City
of
LaPorte
recorded
4th
high
ozone
values
of
82
and
84
ppb
and
68
and
71
ppb,
respectively.

5.7
Additional
Information
Modeling
results
demonstrate
that
local
emission
reductions,
regardless
of
volume,
have
little
to
no
impact
on
ozone
concentrations
within
LaPorte
County.

Local
governments
within
LaPorte
County
have
recently
adopted
and
implemented
strategies
to
improve
air
quality
in
the
area
voluntarily.
These
strategies
include
the
use
of
cleaner
burning
alternative
fuels,
implementation
of
non­
idling
policies
for
municipal
vehicles,
and
enhanced
public
education
and
awareness.
­
7
­

5.8
Conclusions
The
following
factors
support
the
request
for
downward
revision
to
the
8­
hour
ozone
classification
for
LaPorte
County:
the
design
value
of
93
ppb
meets
our
criteria
to
qualify
for
consideration
of
bump
down,
local
modeling
shows
that
the
area
will
be
close
to
attainment
in
2007,
proposed
CAIR
modeling
shows
the
area
will
attain
by
2010,
a
short
term
trends
analysis
shows
large
decreases
in
ozone
values,
and
additional
reductions
from
regional
and
national
regulations
will
support
this
trend
in
low
ambient
ozone
values.

5.9
EPA
Action
The
request
meets
certain
criteria
EPA
established
(
request,
discontinuity,
emission
reductions,
trends,
and
data)
and
does
not
violate
any
of
the
criteria
(
attainment).
Therefore,
EPA
is
approving
the
reclassification
request
for
LaPorte
County.

6.0
Additional
Information
Additional
information
regarding
the
bump
down
request
for
this
area
is
contained
in
the
docket
for
this
action.
This
information
includes
the
State
request,
supporting
documents,
and
other
necessary
material.
