
1
February
11,
2004
MEMORANDUM
From:
William
H.
Maxwell
CG/
ESD
(
C439­
01)

To:
Utility
MACT
Project
Files
Subject:
Analysis
of
variability
in
determining
MACT
floor
for
coal­
fired
electric
utility
steam
generating
units
 
Errata
sheet
In
a
memorandum
dated
November
26,
2003
(
E­
DOCKET
entry
OAR­
2002­
0056­
0006),
the
following
paragraph
may
be
found
on
the
bottom
of
page
4:

The
control
configuration
of
each
of
the
best
performing
units
identified
was
identified.
The
Hg
removal
fraction
and
test
coal
Cl
concentrations
were
obtained
from
the
ICR
database
for
each
of
the
units
in
the
database
that
have
one
of
the
identified
control
configurations.
Finally,
a
correlation
equation
was
derived
for
each
identified
control
configuration
by
fitting
the
following
mathematical
expression
to
the
Hg
removal
fractions
and
corresponding
Cl
concentrations
obtained
from
the
ICR
stack
test
database.

However,
the
"
mathematical
expression"
noted
in
the
last
sentence
was
not
included
in
the
memorandum.
The
mathematical
expression
is
as
follows:

Fr
=
1
­
[
 
exp(­
 CCl)]

where:
Fr
=
fraction
of
mercury
removed
during
the
test
CCl
=
chlorine
concentration
in
the
test
coal
(
ppm)

{
For
clarification,
the
mathematical
expression
is:
Fr
=
One
minus
the
product
of
(
beta)
and
the
quantity
["
e"
raised
to
the
(­
alpha*
CCl)
power].}
