Document ID: EPA-HQ-OAR-2003-0061-0409
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2004-09-15T04:00Z

Attachment
3
PM2.5
Monitoring
Trends
for
Macon,
Athens,
and
Rossville
Monitors
Macon
 
Allied
Chemical
Macon
 
Forestry
Athens
Rossville
2001
Arithmetic
Mean
16.1
ug/
m3
13.8
ug/
m3
17.5
ug/
m3
15.9
ug/
m3
2002
Arithmetic
Mean
14.8
ug/
m3
13.2
ug/
m3
15.0
ug/
m3
14.8
ug/
m3
2003
Arithmetic
Mean
14.8
ug/
m3
13.0
ug/
m3
14.3
ug/
m3
16.0
ug/
m3
2001­
2003
Design
Value
15.2
ug/
m3
13.3
ug/
m3
15.6
ug/
m3
15.6
ug/
m3
2004
 
1st
Quarter
14.5
ug/
m3
12.4
ug/
m3
13.5
ug/
m3
11.7
ug/
m3
2004
 
2nd
Quarter
16.4
ug/
m3
13.7
ug/
m3
15.0
ug/
m3
14.7
ug/
m3
2004
 
1st
&
2nd
Quarter
Arithmetic
Mean
15.4
ug/
m3
13.1
ug/
m3
14.2
ug/
m3
13.2
ug/
m3
2004
Critical
Value*
15.4
ug/
m3
18.8
ug/
m3
15.7
ug/
m3
14.2
ug/
m3
2002­
2004
Design
Value
using
1st
&
2nd
Quarter
2004
15.0
ug/
m3
13.1
ug/
m3
14.5
ug/
m3
14.7
ug/
m3
*
Critical
Value
is
the
minimum
2004
arithmetic
mean
that
would
result
in
a
2002­
2004
design
value
that
exceeds
the
annual
PM2.5
standard
for
each
specific
monitor.

The
data
for
the
Macon­
Allied
Chemical
monitor
shows
PM2.5
levels
that
are
very
close
to
the
critical
value
so
far
this
year.
Attainment
of
the
PM2.5
standard
for
this
monitor
will
depend
on
the
levels
measured
for
the
3rd
and
4th
quarter
of
2004.
Most
likely,
we
will
not
have
a
good
indication
of
this
monitor's
status
until
after
the
4th
quarter
since
PM2.5
levels
in
the
2nd
and
3rd
quarters
are
generally
higher
than
the
1st
and
4th
quarters.
The
date
for
the
Macon­
Forestry
monitor
indicates
that
this
monitor
will
continue
to
show
compliance
with
the
PM2.5
standard.
For
this
reason,
EPD
recommends
that
Bibb
County
and
the
portion
of
Monroe
County
that
contains
Plant
Scherer
(
specific
boundary
included
in
earlier
correspondence)
be
designated
"
attainment/
unclassifiable"
for
PM2.5.

The
1st
&
2nd
quarter
data
for
Athens
clearly
shows
a
continued
downward
trend
in
PM2.5
levels.
The
2004
arithmetic
mean
should
easily
stay
below
the
critical
value
of
15.7
ug/
m3,
thus
achieving
attainment
of
the
PM2.5
standard
for
Athens.
For
this
reason,
EPD
recommends
that
Clarke
County
be
designated
"
attainment/
unclassifiable"
for
PM2.5.

The
1st
&
2nd
quarter
data
for
the
Rossville
Monitor
shows
PM2.5
levels
well
below
historical
levels.
Should
this
trend
continue,
the
2004
arithmetic
mean
should
be
well
below
the
critical
value
of
15.7
ug/
m3.
EPD
therefore,
requests
that
Walker
County
be
designated
as
"
attainment/
unclassifiable."
Once
the
final
2004
data
for
the
Rossville
monitor
is
obtained,
EPD
can
then
consult
with
the
Tennessee
Department
of
Environment
and
Conservation
and
U.
S.
EPA
concerning
the
final
classification
of
the
Chattanooga
area
and
the
nonattainment
area
boundary
should
the
Chattanooga
area
eventually
be
classified
as
nonattainment
for
PM2.5.