Appendix
A
to
Subpart
DDDDD
 
Methodology
and
Criteria
for
Demonstrating
Eligibility
for
the
Risk­
Based
Provisions
Specified
for
the
Large
Solid
Fuel
Subcategory
1.
Purpose/
Introduction
This
appendix
provides
the
methodology
and
criteria
for
demonstrating
that
your
affected
source
is
eligible
for
exemption
from
complying
with
the
HCl
emission
limit
and/
or
excluding
manganese
from
the
total
selected
metals
emission
limit.
This
appendix
specifies
emissions
testing
methods
that
you
must
use
to
determine
HCl,
chlorine,
and
manganese
emissions
from
the
affected
sources
and
what
parts
of
the
affected
source
facility
must
be
included
in
the
eligibility
demonstration.
You
must
determine
if
your
facility
is
eligible
for
the
risk­
based
provisions
using
either
a
look­
up
table
analysis
(
based
on
the
look­
up
tables
included
in
this
appendix)
or
using
the
sitespecific
methodology
described
in
the
"
Air
Toxics
Risk
Assessment
Guidance
Reference
Library"
together
with
the
criteria
specified
in
this
appendix.
This
appendix
also
specifies
how
and
when
you
must
obtain
approval
of
the
eligibility
demonstrations
for
your
affected
source
and
how
to
show
that
your
affected
source
remains
eligible
for
the
risk­
based
provisions.

2.
Who
is
eligible
to
demonstrate
that
they
qualify
for
the
riskbased
provisions?
Each
new,
reconstructed,
or
existing
affected
source
may
demonstrate
that
they
are
eligible
for
the
risk­
based
provisions.
Section
§
63.7490
of
subpart
DDDDD
defines
the
affected
source
and
explains
which
affected
sources
are
new,
existing,
or
reconstructed.

3.
What
parts
of
my
facility
have
to
be
included
in
the
riskbased
eligibility
demonstration?
You
must
include
every
appropriate
emission
point
within
the
affected
source
facility
that
emits
one
or
more
HAP
in
the
eligibility
demonstration.
Alternatively,
you
can
choose
to
assess
only
the
emission
points
covered
by
subpart
DDDDD.
If
a
facility
chooses
this
option
under
the
lookup
table
approach,
you
must
multiply
the
appropriate
value
in
the
lookup
table
by
0.5
to
arrive
at
your
allowable
toxicity­
weighted
HCl
emission
rate
or
your
allowable
manganese
emission
rate.
Under
the
site­
specific
risk
assessment
approach,
you
must
compare
the
Hazard
Index
to
the
limit
of
0.5.

4.
How
do
I
determine
HAP
emissions
from
my
affected
source?
(
a)
You
must
conduct
HAP
emissions
tests
for
every
appropriate
emission
point
within
the
affected
source
facility
that
emits
HAP
according
to
the
requirements
in
paragraphs
(
b)
through
(
f)
of
this
section
and
the
methods
specified
in
Table
1
of
this
appendix.
You
must
test
the
units
at
your
facility
for
MaxHourlyEmissions
ER
Hm
=
×
each
of
the
appropriate
pollutants
listed
in
Table
1.

(
b)
Periods
when
emissions
tests
must
be
conducted.
(
1)
You
must
not
conduct
emissions
tests
during
periods
of
startup,
shutdown,
or
malfunction,
as
specified
in
§
63.7(
e)(
1).
(
2)
You
must
test
under
worst­
case
operating
conditions
as
defined
in
this
appendix.
You
must
describe
your
worst­
case
operating
conditions
in
your
performance
test
report
for
the
process
and
control
systems
(
if
applicable)
and
explain
why
the
conditions
are
worst­
case.
(
c)
Number
of
test
runs.
You
must
conduct
three
separate
test
runs
for
each
test
required
in
this
section,
as
specified
in
§
63.7(
e)(
3).
Each
test
run
must
last
at
least
1
hour.
(
d)
Sampling
locations.
Sampling
sites
must
be
located
at
the
outlet
of
the
control
device,
including
wet
control
devices,
and
prior
to
any
releases
to
the
atmosphere.
(
e)
Collection
of
monitoring
data
for
HAP
control
devices.
During
the
emissions
test,
you
must
collect
operating
parameter
monitoring
system
or
continuous
emissions
monitoring
system
(
CEMS)
data
at
least
every
15
minutes
during
the
entire
emissions
test
and
establish
the
site­
specific
operating
requirements
in
Table
2
of
subpart
DDDDD
using
data
from
the
monitoring
system
and
the
procedures
specified
in
§
63.7530
of
subpart
DDDDD.
(
f)
Nondetect
data.
You
may
treat
emissions
of
an
individual
HAP
as
zero
if
all
of
the
test
runs
result
in
a
nondetect
measurement
and
the
condition
in
paragraph
(
1)
is
met
for
the
manganese
test
method.
Otherwise
nondetect
data
for
individual
HAP
must
be
treated
as
one­
half
of
the
method
detection
limit.
(
1)
For
manganese
measured
using
Method
29
in
appendix
A
to
40
CFR
part
60,
you
analyze
samples
using
atomic
absorption
spectroscopy
(
AAS).
(
g)
You
must
determine
the
maximum
hourly
emission
rate
for
each
appropriate
emission
point
according
to
equation
1.

(
Eq.
1
)

Where:
MaxHourly
=
Maximu
m
hourly
emissi
ons
for
Emissions
hydrogen
chloride,
chlorine,
or
manganese,
in
units
of
pounds
per
hour.
Er
=
Emission
rate
(
as
calculated
according
to
Table
1
of
this
appendix)
for
hydrogen
chloride,
chlorine,
or
manganese,
in
units
of
pounds
per
million
Btu
of
heat
input.
Hm
=
Maximum
rated
heat
input
capacity
of
appropriate
emission
point,
in
units
of
million
Btu
per
hour.

5.
What
are
the
criteria
for
determining
if
my
facility
is
eligible
for
the
risk­
based
provisions?
(
a)
Determine
the
HAP
emissions
from
each
appropriate
emission
point
within
the
affected
source
facility
using
the
procedures
specified
in
section
4
of
this
appendix.
(
b)
Determine
if
your
facility
is
eligible
for
either
of
the
risk­
based
provisions
using
one
of
the
methods
described
in
either
section
6
of
this
appendix
(
look­
up
table
analysis)
or
section
7
of
this
appendix
(
site­
specific
risk
assessment).

6.
How
do
I
conduct
a
look­
up
table
analysis?

Use
the
look­
up
tables
to
determine
if
your
facility
is
eligible
for
either
the
exemption
from
the
HCl
emission
limit
or
the
exclusion
of
manganese
from
the
total
selected
metals
emission
rate
determination.
(
a)
HCl
risk­
based
exemption.
Determine
the
total
toxicityweighted
HCl
equivalent
emission
rate
for
your
affected
source
by
summing
the
maximum
hourly
HCl
and
CL2
emission
rates
(
calculated
using
the
procedure
in
section
(
5)(
g)
of
this
appendix)
from
all
sources
within
the
facility
boundary
line.
A
toxicity­
weighted
emission
rate
expressed
in
HCl
equivalents
is
then
calculated
according
to
equation
1.

ERtw
=
E.
R.
HCl
+(
E.
R.
Cl2*
100)
Eq.
1
where:
ERtw
is
toxicity­
weighted
emission
rate
ERHCl
is
the
HCl
emission
rate
in
lbs/
hr
ERCl2
is
the
Cl2
emission
rate
in
lbs/
hr
Calculated
toxicity­
weighted
emission
rates
will
then
be
compared
to
the
appropriate
allowable
toxicity­
weighted
emission
rate
in
the
table.
To
determine
the
correct
value
from
the
table,
a
facility­
wide
average
value
should
be
used
for
stack
height
and
the
minimum
distance
between
any
stack
at
the
facility
and
the
closest
boundary
of
the
nearest
residential
(
or
residentially
zoned)
area
should
be
used
for
fenceline
distance.
Your
facility
is
exempt
from
demonstrating
compliance
with
the
HCl
emission
limit
if
your
toxicity­
weighted
emission
rate,
determined
using
the
methods
specified
in
this
appendix,
does
not
exceed
the
values
specified
in
Table
2
of
this
appendix.
Alternatively,
a
facility
can
choose
to
assess
only
the
emission
points
covered
by
the
subpart
DDDDD.
If
a
facility
chooses
this
option,
they
must
multiply
the
appropriate
value
in
the
lookup
table
by
0.5
to
arrive
at
their
allowable
toxicityweighted
emission
rate.
(
b)
Manganese
Exclusion.
Determine
the
total
maximum
manganese
emission
rate
for
your
affected
source
by
summing
the
maximum
hourly
manganese
emission
rates
(
calculated
using
the
procedure
in
section
(
5)(
g)
of
this
appendix)
for
all
sources
within
the
facility
boundary
line.
Calculated
maximum
manganese
emission
rates
will
then
be
compared
to
the
appropriate
allowable
manganese
emission
rate
in
the
table.
To
determine
the
correct
value
from
the
table,
a
facility­
wide
average
value
should
be
used
for
stack
height
and
the
minimum
distance
between
any
stack
at
the
facility
and
the
closest
boundary
of
the
nearest
residential
(
or
residentially
zoned)
area
should
be
used
for
fenceline
distance.
Your
facility
is
exempt
from
including
manganese
in
demonstrating
compliance
with
the
total
selected
metals
emission
limit
if
your
manganese
emission
rate,
determined
using
the
methods
specified
in
this
appendix,
does
not
exceed
the
values
specified
in
Table
3
of
this
appendix.
Alternatively,
a
facility
can
choose
to
assess
only
the
emission
points
covered
by
the
subpart
DDDDD.
If
a
facility
chooses
this
option,
they
must
multiply
the
appropriate
value
in
the
lookup
table
by
0.5
to
arrive
at
their
allowable
manganese
emission
rate.

7.
How
do
I
conduct
a
site­
specific
risk
assessment?

Use
the
tiered
methodology
for
conducting
site­
specific
risk
assessments
according
to
the
"
Air
Toxics
Risk
Assessment
Guidance
Reference
Library"
and
the
criteria
specified
in
paragraphs
(
a)
through
(
f)
of
this
section
to
determine
if
your
facility
is
eligible
for
either
of
the
risk­
based
provisions.
You
may
obtain
a
copy
of
the
"
Air
Toxics
Risk
Assessment
Guidance
Reference
Library"
from
Each
tier
in
the
three­
tiered
site­
specific
risk
assessment
methodology
results
in
more
refined
risk
modeling
results.
You
only
need
to
complete
the
lowest
tier
that
demonstrates
that
your
facility
is
eligible
for
one
or
both
of
the
risk­
based
provisions.
However,
you
need
not
conduct
all
tiered
analyses
before
moving
to
a
higher
tier
(
e.
g.,
you
could
choose
to
do
the
tier
3
analysis
first
without
conducting
the
look­
up
table,
tier
1,
or
tier
2
analyses).
(
a)
You
may
use
an
alternative
method
of
risk
assessment
(
other
than
the
methods
described
in
the
"
Air
Toxics
Risk
Assessment
Guidance
Reference
Library")
provided
you
request
and
obtain
approval
to
use
the
alternative
method
from
the
EPA
Administrator.
The
alternative
method
must
have
been
subject
to
independent
peer
review.
(
b)
Your
facility
is
eligible
for
the
HCl
exemption
if
your
site­
specific
risk
assessment
demonstrates
that
the
HI
from
HCl
and
CL2
is
less
than
one
(
or
0.5
if
you
choose
to
assess
only
the
emission
points
covered
by
subpart
DDDDD).
(
c)
Your
facility
is
eligible
for
the
manganese
exclusion
if
your
site­
specific
risk
assessment
demonstrates
the
risk
from
manganese
emissions
is
less
than
one
(
or
0.5
if
you
choose
to
assess
only
the
emission
points
covered
by
subpart
DDDDD).

8.
What
must
my
risk­
based
eligibility
demonstration
contain?

(
a)
Your
low­
risk
demonstration
must
contain
the
information
specified
in
paragraphs
(
a)(
1)
through
(
6)
of
this
section.
(
1)
Identification
of
each
appropriate
emission
point
at
the
affected
source.
(
2)
Dispersion
parameters
for
each
appropriate
emission
point
including,
but
not
limited
to,
the
parameters
listed
in
(
a)(
2)(
i)
through
(
iv)
below:
(
i)
Emission
release
type
(
ii)
Stack
height,
stack
area,
stack
gas
temperature,
and
stack
gas
exit
velocity
(
iii)
Distance
from
each
appropriate
emission
point
to
the
fenceline.
(
iv)
Identification
of
any
control
devices
used
to
reduce
emissions
from
each
appropriate
emission
point.
(
3)
Emission
test
reports
for
each
appropriate
emission
point
based
on
the
test
methods
specified
in
Table
1
of
this
appendix,
including
a
description
of
the
process
parameters
identified
as
being
worst
case.
(
4)
Identification
of
the
RfC
values
used
in
your
sitespecific
risk
assessment,
according
to
section
5(
b)
of
this
appendix.
(
5)
Calculations
used
to
determine
the
toxicity­
weighted
emission
rates
expressed
in
HCl
equivalents
according
to
section
5(
c)
of
this
appendix.
(
6)
Identification
of
the
controlling
process
factors
(
including,
but
not
limited
to,
fuel
type,
heat
input
rate,
type
of
control
devices,
process
parameters
documented
as
worst­
case
conditions
during
the
emissions
testing
used
for
your
eligibility
demonstration)
that
will
become
Federally
enforceable
permit
conditions
used
to
show
that
your
facility
remains
eligible
for
the
risk­
based
provisions.
(
b)
If
you
use
the
look­
up
table
analysis
in
section
5
of
this
appendix
to
demonstrate
that
your
facility
is
eligible
for
either
the
risk­
based
exemption
or
the
risk­
based
exclusion,
your
eligibility
demonstration
must
contain
the
information
in
paragraphs
(
a)
and
(
b)(
1)
through
(
3)
of
this
section.
(
1)
Calculations
used
to
determine
the
average
stack
height
of
the
appropriate
emission
points.
(
2)
Identification
of
the
appropriate
emission
point
with
the
nearest
distance
to
the
closest
boundary
of
the
nearest
residential
(
or
residentially
zoned)
area
used
for
fenceline
distance.
(
3)
Comparison
of
the
values
in
the
look­
up
tables
(
Tables
2
and
3
of
this
appendix)
to
your
maximum
hourly
emission
rates.
(
c)
If
you
are
using
a
site­
specific
risk
assessment
as
described
in
section
7
of
this
appendix
to
demonstrate
that
your
facility
is
eligible,
your
eligibility
demonstration
must
contain
the
information
in
paragraphs
(
a)
and
(
c)(
1)
through
(
12)
of
this
section:
(
1)
Identification
of
the
risk
assessment
tier
used
(
tier
1,
tier
2,
or
tier
3),
or
description
of
the
approved
alternative
method
used.
(
2)
Documentation
of
the
fate
and
transport
model
used
(
such
as,
SCREEN3,
HEM,
ISCST3,
etc.).
(
3)
Documentation
of
the
fate
and
transport
model
inputs,
including
the
information
described
in
paragraphs
(
a)(
1)
through
(
5)
of
this
section
converted
to
the
dimensions
required
for
the
model
and
all
of
the
following
that
apply:
meteorological
data;
building,
land
use,
and
terrain
data;
receptor
locations
and
population
data;
and
other
facility­
specific
parameters
input
into
the
model.
(
4)
Documentation
of
the
fate
and
transport
model
outputs.
(
5)
Documentation
of
exposure
assessment
and
risk
characterization
calculations
performed
according
to
the
"
Air
Toxics
Risk
Assessment
Guidance
Reference
Library."
(
6)
Documentation
of
uncertainty
analysis
(
required
for
tier
3
only)
performed
according
to
the
"
Air
Toxics
Risk
Assessment
Guidance
Reference
Library."
(
7)
Comparison
of
each
chronic
inhalation
TOSHI
(
for
respiratory
effects,
neurological
effects,
etc.)
to
the
limit
of
1,
as
required
in
section
7(
c)
of
this
appendix.
(
8)
Comparison
of
the
acute
inhalation
HI
to
the
limit
of
1,
as
required
in
section
7(
d)
of
this
appendix.

9.
When
do
I
have
to
complete
and
submit
my
risk­
based
eligibility
demonstration?

(
a)
If
you
have
an
existing
affected
source,
you
must
complete
and
submit
for
approval
your
low­
risk
demonstration
no
later
than
the
date
one
year
after
the
effective
date
of
subpart
DDDDD.
(
b)
If
you
have
a
new
or
reconstructed
affected
source
that
starts
up
before
the
effective
date
of
subpart
DDDDD,
or
an
affected
source
that
is
an
area
source
that
increases
its
emissions
or
its
potential
to
emit
such
that
it
becomes
a
major
source
of
HAP
before
the
effective
date
of
subpart
DDDDD,
then
you
must
comply
with
the
requirements
of
subpart
DDDDD
until
the
eligibility
demonstration
that
you
complete
and
submit
for
approval
is
approved
by
EPA.
(
c)
If
you
have
a
new
or
reconstructed
affected
source
that
starts
up
after
the
effective
date
for
subpart
DDDDD,
or
an
affected
source
that
is
an
area
source
that
increases
its
emissions
or
its
potential
to
emit
such
that
it
becomes
a
major
source
of
HAP
after
the
effective
date
for
subpart
DDDDD,
then
you
must
follow
the
schedule
in
paragraphs
(
1)
and
(
2)
of
this
section.
(
1)
You
must
complete
and
submit
for
approval
a
preliminary
eligibility
demonstration
based
on
the
information
(
e.
g.,
equipment
types,
estimated
emission
rates,
etc.)
used
to
obtain
your
title
V
permit.
You
must
base
your
preliminary
eligibility
demonstration
on
the
maximum
emissions
allowed
under
your
title
V
permit.
If
EPA
concludes
that
your
affected
source
facility
appears
to
be
eligible
for
either
risk­
based
provision
based
on
this
preliminary
eligibility
demonstration,
then
your
may
start
up
your
new
affected
source
without
either
complying
with
the
HCl
emission
limit
and
corresponding
compliance
requirements
in
subpart
DDDDD
or
including
manganese
in
your
total
selected
metals
calculations.
(
2)
You
must
conduct
the
emission
tests
specified
in
section
4
of
this
appendix
upon
initial
startup
and
use
the
results
of
these
emissions
tests
to
complete
and
submit
your
eligibility
demonstration
within
180
days
following
your
initial
startup
date.
To
be
eligible,
you
must
meet
the
criteria
in
section
11
of
this
appendix
within
18
months
following
initial
startup
of
your
affected
source.

11.
When
do
I
become
eligible
for
the
risk­
based
provisions?

To
be
eligible
for
either
the
risk­
based
HCl
exemption
or
the
risk­
based
manganese
exclusion,
you
must
meet
the
criteria
in
paragraphs
(
a)
and
(
b)
of
this
section.
If
you
do
not
meet
these
criteria,
then
your
affected
source
is
subject
to
the
applicable
compliance
options,
operating
requirements,
and
work
practice
requirements
in
Subpart
DDDDD.
(
a)
Your
demonstration
of
eligibility
must
be
approved
by
EPA.
(
b)
The
parameters
that
defined
your
affected
source
as
eligible
for
the
risk­
based
provisions
(
including,
but
not
limited
to,
fuel
type,
type
of
control
devices,
process
parameters
documented
as
worst­
case
conditions
during
the
emissions
testing
used
for
your
eligibility
demonstration)
must
be
incorporated
as
Federally
enforceable
limits
into
your
title
V
permit.

12.
How
do
I
ensure
that
my
facility
remains
in
the
low­
risk
PCWP
subcategory?

(
a)
You
must
update
your
eligibility
demonstration
and
resubmit
it
to
EPA
for
re­
approval
each
time
one
of
the
actions
in
paragraphs
(
a)(
1)
and
(
2)
occurs.
(
1)
A
pollutant
is
deemed
to
be
more
potent
than
thought
at
the
time
of
your
original
eligibility
demonstration
(
i.
e.,
if
a
reference
concentration
decreases
for
one
of
the
pollutants
included
in
your
approved
eligibility
demonstration).
You
must
check
the
EPA
website
(
http://
www.
epa.
gov/
ttn/
atw/
toxsource/
summary.
html)
at
least
once
per
calendar
quarter
for
dose­
response
values
(
RfC)
to
ensure
that
they
remain
the
same
as
the
values
used
in
your
approved
elibility
demonstration.
(
2)
You
have
a
process
change,
such
that
any
of
the
parameters
that
defined
your
affected
source
changes
in
a
way
that
could
result
in
increased
HAP
emissions
(
including,
but
not
limited
to,
fuel
type,
change
in
type
of
control
device,
changes
in
process
parameters
documented
as
worst­
case
conditions
during
the
emissions
testing
used
for
your
approved
eligibility
demonstration).
(
b)
You
need
not
conduct
repeat
emissions
tests
according
to
section
4
of
this
appendix
when
updating
your
eligibility
demonstration
to
account
for
one
of
the
actions
specified
in
paragraph
(
a)(
1)
of
this
section,
provided
that
you
collected
emissions
test
data
for
the
subject
pollutant
when
you
conducted
emissions
testing
for
your
previously
approved
eligibility
demonstration.
(
c)
You
must
update
and
re­
submit
your
low­
risk
demonstration
according
to
the
schedule
specified
in
paragraphs
(
c)(
1)
and
(
2)
below.
(
1)
If
you
are
updating
your
eligilibity
demonstration
to
account
the
action
in
paragraph
(
a)(
1)
of
this
section,
then
you
must
submit
your
revised
eligibility
demonstration
to
EPA
within
1
year
following
the
change
to
the
pollutant
dose­
response
value.
If
your
updated
eligibility
demonstration
indicates
that
your
affected
source
is
no
longer
part
of
the
low­
risk
subcategory,
then
you
must
comply
with
the
applicable
emission
limits,
compliance
options,
and
operating
requirements
in
Subpart
DDDDD
within
3
years
following
the
change
to
the
pollutant
doseresponse
value.
(
2)
If
you
are
updating
your
eligibility
demonstration
to
account
for
an
action
in
paragraph
(
a)(
2)
of
this
section,
then
you
must
perform
emission
testing
according
to
section
4
of
this
appendix
for
the
appropriate
emission
points
that
may
have
increased
HAP
emissions
beyond
the
levels
reflected
in
your
previously
approved
eligibility
demonstration
due
to
the
process
change.
You
must
submit
your
revised
eligibility
demonstration
to
EPA
prior
to
revising
your
permit
to
incorporate
the
process
change.
If
your
updated
eligibility
demonstration
indicates
that
your
affected
source
is
no
longer
eligible
for
the
risk­
based
provisions,
then
you
must
comply
with
the
applicable
emission
limits,
compliance
options,
and
operating
requirements
in
Subpart
DDDDD
prior
to
making
the
process
change
and
revising
your
permit.

13.
What
records
must
I
keep?
(
a)
You
must
keep
records
of
the
information
used
in
developing
the
eligibility
demonstration
for
your
affected
source,
including
all
of
the
information
specified
in
section
8
of
this
appendix.

(
b)
You
must
keep
dated
records
(
e.
g.,
quarterly
printouts
of
http://
www.
epa.
gov/
ttn/
atw/
toxsource/
summary.
html)
of
the
current
dose­
response
values
to
ensure
that
they
match
the
doseresponse
values
used
in
your
approved
eligibility
demonstration.

14.
Definitions.
The
definitions
in
§
63.7575
of
subpart
DDDDD
apply
to
this
appendix.
Additional
definitions
applicable
for
this
appendix
are
as
follows:

Appropriate
emission
point
means
a
process
unit
that
is
reasonably
expected
to
emit
the
HAP
of
concern
(
HCl,
chlorine,
or
manganese).

Hazard
Index
(
HI)
means
the
sum
of
more
than
one
hazard
quotient
for
multiple
substances
and/
or
multiple
exposure
pathways.

Hazard
Quotient
(
HQ)
means
the
ratio
of
the
potential
exposure
to
the
substance
and
the
level
at
which
no
adverse
effects
are
expected.
For
inhalation
exposures,
the
HQ
is
calculated
as
the
air
concentration
divided
by
the
RfC.

Look­
up
table
analysis
means
a
risk
screening
analysis
based
on
comparing
the
total
HAP
emissions
from
the
affected
source,
converted
to
a
toxicity­
weighted
emission
rate,
to
the
maximum
allowable
toxicity­
weighted
emission
rates
in
Tables
3
and
4
of
this
appendix
for
a
facility­
specific
stack
height
and
fenceline
distance.

Reference
Concentration
(
RfC)
means
an
estimate
(
with
uncertainty
spanning
perhaps
an
order
of
magnitude)
of
a
continuous
inhalation
exposure
to
the
human
population
(
including
sensitive
subgroups
which
include
children,
asthmatics
and
the
elderly)
that
is
likely
to
be
without
an
appreciable
risk
of
deleterious
effects
during
a
lifetime.
It
can
be
derived
from
various
types
of
human
or
animal
data,
with
uncertainty
factors
generally
applied
to
reflect
limitations
of
the
data
used.

Reference
Dose
(
RfD)
means
an
estimate
(
with
uncertainty
spanning
perhaps
an
order
of
magnitude)
of
a
daily
oral
exposure
to
the
human
population
(
including
sensitive
subgroups
which
include
children,
asthmatics
and
the
elderly)
that
is
likely
to
be
without
an
appreciable
risk
of
deleterious
effects
during
a
lifetime.
It
can
be
derived
from
various
types
of
human
or
animal
data,
with
uncertainty
factors
generally
applied
to
reflect
limitations
of
the
data
used.

Target
organ
specific
hazard
index
(
TOSHI)
means
the
sum
of
hazard
quotients
for
individual
chemicals
that
affect
the
same
organ
or
organ
system
(
e.
g.,
respiratory
system,
central
nervous
system).

Worst­
case
operating
conditions
means
operation
of
a
process
unit
during
emissions
testing
under
the
conditions
that
result
in
the
highest
HAP
emissions
or
that
result
in
the
emissions
stream
composition
(
including
HAP
and
non­
HAP)
that
is
most
challenging
for
the
control
device
if
a
control
device
is
used.
For
example,
worst
case
conditions
could
include
operation
of
the
process
unit
at
maximum
throughput
with
the
wood
species
mix
likely
to
produce
the
most
HAP.
Table
1
to
Appendix
B
of
Subpart
DDDD.
Emission
Test
Methods.

For...
You
must...
Using...

(
1)
each
emission
point
select
sampling
ports'
location
and
the
number
of
traverse
points
Method
1
of
40
CFR
part
60,
appendix
A.

(
2)
each
emission
point
determine
velocity
and
volumetric
flow
rate;
Method
2,
2F,
or
2G
in
appendix
A
to
40
CFR
part
60.

(
3)
each
emission
point
conduct
gas
molecular
weight
analysis
Method
3A
or
3B
in
appendix
A
to
40
CFR
part
60.

(
4)
each
emission
point
measure
moisture
content
of
the
stack
gas
Method
4
in
appendix
A
to
40
CFR
part
60.

(
5)
each
emission
point
measure
the
hydrogen
chloride
and
chlorine
emission
concentrations
Method
26
or
26A
in
appendix
A
to
40
CFR
part
60.

(
6)
each
emission
point
measure
the
manganese
emission
concentration
Method
29
in
appendix
A
to
40
CFR
part
60.

(
7)
each
emission
point
convert
emissions
concentration
to
lb
per
MMBtu
emission
rates.
Method
19
F­
factor
methodology
in
appendix
A
to
part
60
of
this
chapter.
Table
2
to
Appendix
A
of
Subpart
DDDDD.
Allowable
toxicity­
weighted
emission
rate
expressed
in
HCl
equivalents
(
lbs/
hr)

fenceline
(
m)

Stack
ht.(
m)
50
100
150
200
250
500
1000
1500
2000
3000
5000
5
114.9
114.9
114.9
114.9
114.9
144.3
287.3
373.0
373.0
373.0
373.0
10
188.5
188.5
188.5
188.5
188.5
195.3
328.0
453.5
434.4
434.4
434.4
20
386.1
386.1
386.1
386.1
386.1
386.1
425.4
580.0
602.7
602.7
602.7
30
396.1
396.1
396.1
396.1
396.1
396.1
436.3
596.2
690.6
807.8
816.5
40
408.1
408.1
408.1
408.1
408.1
408.1
448.2
613.3
715.5
832.2
966.0
50
421.4
421.4
421.4
421.4
421.4
421.4
460.6
631.0
746.3
858.2
1002.8
60
435.5
435.5
435.5
435.5
435.5
435.5
473.4
649.0
778.6
885.0
1043.4
70
450.2
450.2
450.2
450.2
450.2
450.2
486.6
667.4
813.8
912.4
1087.4
80
465.5
465.5
465.5
465.5
465.5
465.5
500.0
685.9
849.8
940.9
1134.8
100
497.5
497.5
497.5
497.5
497.5
497.5
527.4
723.6
917.1
1001.2
1241.3
200
677.3
677.3
677.3
677.3
677.3
677.3
682.3
919.8
1167.1
1390.4
1924.6
Table
3
to
Appendix
A
of
Subpart
DDDDD.
Allowable
Manganese
Emission
Rates
(
lbs/
hr)

fenceline
(
m)

Stack
ht.(
m)
50
100
150
200
250
500
1000
1500
2000
3000
5000
5
0.29
0.29
0.29
0.29
0.29
0.36
0.72
0.93
0.93
0.93
0.93
10
0.47
0.47
0.47
0.47
0.47
0.49
0.82
1.13
1.09
1.09
1.09
20
0.97
0.97
0.97
0.97
0.97
0.97
1.06
1.45
1.51
1.51
1.51
30
0.99
0.99
0.99
0.99
0.99
0.99
1.09
1.49
1.73
2.02
2.04
40
1.02
1.02
1.02
1.02
1.02
1.02
1.12
1.53
1.79
2.08
2.42
50
1.05
1.05
1.05
1.05
1.05
1.05
1.15
1.58
1.87
2.15
2.51
60
1.09
1.09
1.09
1.09
1.09
1.09
1.18
1.62
1.95
2.21
2.61
70
1.13
1.13
1.13
1.13
1.13
1.13
1.22
1.67
2.03
2.28
2.72
80
1.16
1.16
1.16
1.16
1.16
1.16
1.25
1.71
2.12
2.35
2.84
100
1.24
1.24
1.24
1.24
1.24
1.24
1.32
1.81
2.29
2.50
3.10
200
1.69
1.69
1.69
1.69
1.69
1.69
1.71
2.30
2.92
3.48
4.81
