October
14,
2003
James
Eddinger
Combustion
Group
Emission
Standards
Division
Office
of
Air
Quality
Planning
and
Standards
US
Environmental
Protection
Agency
Research
Triangle
Park,
NC
27711
Dear
Jim:

At
the
meeting
between
ACC
and
EPA
earlier
this
year,
you
had
requested
any
available
information
on
the
number
of
individual
boilers
and
process
heaters
by
size
and
fuel
type
on
typical
major
HAP
source
plant
sites
or
what
would
be
typical
for
regulated
sectors.
The
attached
Excel
file
provides
summarized
information
received
based
on
my
request
to
a
fairly
broad
distribution
among
industrial
association
contacts.

The
responses
received
were
very
limited
and
varied
significantly
by
type
of
installation
and
service.
It
is
recognized
that
this
is
truly
a
limited
sampling
of
the
universe,
but
it
may
provide
some
insight
into
the
range
of
sources
distributed
on
major
source
sites.
There
are
some
cell
notes
in
the
spreadsheet
to
provide
additional
detail.

During
the
ACC/
EPA
meeting,
you
also
requested
any
available
information
on
variation
in
operating
parameters
with
unit
load.
The
only
response
for
information
relating
to
that
request
was
one
confirmation
that
wet
gas
scrubber
pressure
drop
decreased
with
load
due
to
lower
gas
flow
rate.
This
made
alternative
monitoring
based
on
maintaining
the
pressure
drop
measured
at
the
initial
performance
test
problematic
since
that
performance
testing
was
conducted
at
or
near
maximum
load.
However,
no
specific
data
was
provided.
The
approach
going
forward
in
that
case
was
to
rely
on
the
manufacturer's
recommendation
for
pressure
drop
vs
load
for
setting
alternative
monitoring
parameter
guidelines.

I
apologize
for
the
delay
in
providing
this
information
and
hope
it
can
be
of
some
value
in
your
rulemaking
process.
Please
contact
me
with
any
questions
or
if
you
desire
further
clarification
or
additional
information.

Best
regards,

John
C.
deRuyter
Principal
Consultant
Phone:
(
302)
774­
2603
Fax:
(
302)
774­
5276
Email:
john.
c.
deruyter@
usa.
dupont.
com
CC:
Bob
Morehouse­
ExxonMobil
Lorraine
Krupa­
Gershman­
ACC
DuET­
DuPont
Engineering
Technology
Energy
Engineering
1007
Market
St.,
Brandywine
6202
Wilmington,
DE
19898
