Document ID: EPA-HQ-OAR-2002-0009-0055
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2006-08-17T04:00Z

­­­­­
Original
Message­­­­­
From:
Chris
Sarsony
[
mailto:
csarsony@
e2m.
net]
Sent:
Monday,
January
30,
2006
3:
41
PM
To:
'
Johnson.
Ann@
epamail.
epa.
gov';
'
Pagano.
Dennis@
epamail.
epa.
gov';
'
Dail.
Lynn@
epamail.
epa.
gov'
Cc:
'
csarsony@
e2m.
net'
Subject:
RE:
TCA
Ann,

We
looked
at
this
a
while
back
and
found
the
following
for
emissions
(
the
number
of
facilities
I
determined
today):

TCA
emissions
in
1999:
3,704
tons
(
565
facilities)
TCA
emissions
in
2002:
2,295
tons
(
473
facilities)
A
38%
decrease
in
emissions
(
16%
decrease
in
facilities).

MC
emissions
in
1999:
1,384
tons
(
218
facilities)
MC
emissions
in
2002:
405
tons
(
194
facilities)
A
75%
decrease
in
emissions
(
11%
decrease
in
facilities)

TCE
emissions
in
1999:
3,054
tons
(
323
facilities)
TCE
emissions
in
2002:
2,313
tons
(
357
facilities)
A
24%
decrease
in
emissions
(
10%
increase
in
facilities)

PCE
emissions
in
1999:
1,297
tons
(
208
facilities)
PCE
emissions
in
2002:
2,245
tons
(
188
facilities)
A
73%
increase
in
emissions
(
10%
decrease
in
facilities)

OVERALL
EMISSIONS
FOR
FOUR
POLLUTANTS
IN
1999:
9,439
tons
(
1,093
unique
facilities)
OVERALL
EMISSIONS
FOR
FOUR
POLLUTANTS
IN
2002:
7,262
tons
(
1,002
unique
facilities)
A
23%
reduction
in
emissions
(
8%
decrease
in
facilities)

This
data
was
from
the
draft
2002
NEI
database.
One
problem
with
the
version
we
had
to
work
with
was
that
it
did
not
have
the
NEI
facility
ID
field.
This
makes
it
more
difficult
identify
unique
facilities.
We
identified
unique
facilities
in
the
2002
NEI
by
creating
a
composite
field
composed
of
"
StateCountyFIP"
and
"
StateFacilityIdentifier".

Plus,
since
the
database
evolves
over
time
it
may
not
be
accurate
to
directly
compare
1999
to
2002.
For
example,
the
participation
rate
may
have
changed
over
time.
One
anomaly
that
can
be
seen
right
away
is
that
there
was
a
74%
INCREASE
in
PCE
emissions
whereas
the
number
of
facilities
using
PCE
DECREASED
by
10%.
In
addition,
solvent
demand
shows
that
use
of
PCE
decrease
during
this
period.

We
have
to
be
careful
not
to
read
too
much
into
the
comparisons
between
the
two
databases.
A
more
accurate
study
of
the
changes
might
be
to
look
at
the
facilities
that
reported
halogenated
HAP
emissions
in
1999
and
see
what
these
specific
facilities
reported
in
2002.
Unfortunately,
without
the
facility
identifiers
it
may
be
difficult
to
do,
but
I
can
try
it
using
the
composite
field.

Let
me
know
if
you
have
any
questions
or
comments.

Chris
Sarsony
engineering­
environmental
Management,
Inc.
109
Salem
Towne
Court
Apex,
NC
27502
Ph
(
919)
303­
6469
Fx
(
919)
303­
6048
csarsony@
e2m.
net
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