DCN
300­
011
SUBJ:
5­
day
Biochemical
Oxygen
Demand
(
BOD5)
and
Total
Suspended
Solids
(
TSS)
Limits
for
Poultry
Subcategory,
Subcategory
K
FROM:
Samantha
Lewis,
Project
Manager
TO:
MPP
Project
Record
DATE:
February
24,
2004
To
develop
the
final
limitations
and
standards
for
BOD
5
and
TSS
for
the
Poultry
Subcategory,
EPA
first
determined
the
median
BOD
5
and
TSS
effluent
concentrations
of
all
of
the
poultry
facilities
in
its
database
that
utilize
Option
2
or
Option
2.5
technologies.
In
order
to
respond
to
comments,
EPA
eliminated
all
Option
2
and
Option
2.5
facilities
with
a
filter
or
chemical
phosphorus
removal
from
the
analysis.
The
Option
2
and
Option
2.5
technologies
are
the
same
except
that
Option
2.5
also
includes
partial
denitrification.
For
this
evaluation,
EPA
combined
the
data
from
facilities
using
either
option
because
EPA
does
not
want
to
interfere
with
denitrification
(
which
is
required
to
achieve
BAT
limits
for
total
nitrogen)
and
the
data
indicate
that
effluent
discharges
of
BOD
5
and
TSS
are
sometimes
higher
from
facilities
that
employ
partial
denitrification.
Table
1
provides
information
on
the
facilities
and
BOD
5
and
TSS
effluent
discharges
used
to
calculate
the
median
BOD
5
and
TSS
effluent
concentrations.
Based
on
comments
that
EPA
should
use
all
of
the
data
available
to
it,
EPA
used
its
full
effluent
database
for
Option
2
and
2.5
facilities
(
i.
e.,
including
data
from
facilities
that
only
provided
data
reported
as
summarized
monthly
averages
)
to
select
a
model
facility
for
use
in
developing
the
BOD
5
and
TSS
LTAs
for
the
final
rule.
This
ensures
that
facilities
operating
the
selected
technology
would
be
able
to
achieve
the
limitations
and
standards
of
the
final
rule
(
including
the
BAT
limitations
for
total
nitrogen.)

Table
1:
Data
Used
to
Determine
the
Median
BOD
5
and
TSS
Effluent
Concentrations
from
Treatment
with
Option
2
or
Option
2.5
Technologiesa
Facility
Number
Treatment
Option
Mean
BOD
5
Effluent
Concentrationamg/
L
Mean
TSS
Effluent
Concentrationamg/
L
11
2.5
N/
A
12.8
22
2
N/
A
15.65
26
2.5
N/
A
13.9
27
2
13.02
N/
A
32
2.5
N/
A
4.98
39
2
5.30
6.00
Facility
Number
Treatment
Option
Mean
BOD
5
Effluent
Concentrationamg/
L
Mean
TSS
Effluent
Concentrationamg/
L
42
2
7.82
8.34
45
2.5
1.77
4.17
133
2
7.00
31.50
291
2
3.77
5.57
300
2.5
19.40
22.90
307a
2
7.87
10.1
309
2
Exceeds
Permit
Limit
11.1
312
2
3.51
8.94
aFor
facilities
in
EPA's
BAT
database,
these
values
reflect
the
final
values
after
data
exclusions
as
detailed
in
Section
14
of
the
final
Technical
Development
Document.
N/
A
­
Not
Available
Using
the
information
in
Table
1,
EPA
determined
that
the
median
BOD
5
and
TSS
effluent
concentrations
for
all
poultry
facilities
in
EPA's
database
employing
the
Option
2
or
Option
2.5
technologies
are
7.0
mg/
L
and
10.1
mg/
L,
respectively.
However,
for
purposes
of
calculating
the
long­
term
average
(
LTA)
and
variability
factors
(
VFs)
for
use
in
developing
limitations
and
standards
for
the
final
rule,
EPA
is
limited
to
using
only
those
episodes
with
individual
data
points
(
i.
e.
unsummarized
daily/
weekly
monitoring
or
EPA's
3­
5
day
sampling
episodes.)
For
TSS,
the
facility
with
the
median
of
mean
concentrations
(
307a)
did
provide
individual
data,
so
EPA
used
this
data
to
develop
the
LTAs
and
Vfs
for
the
final
limitations
and
standards.
For
BOD
5,
the
facility
with
the
median
of
mean
concentrations
(
133)
did
not
provide
individual
data
points
(
only
summarized
monthly
average
data),
therefore,
EPA
selected
the
facility
whose
median
was
closest
to
the
median
value
but
that
also
provided
individual
data.
For
BOD
5,
this
facility
is
again
307a,
so
EPA
used
this
data
to
develop
the
LTAs
and
Vfs
for
the
final
limitations
and
standards
Because
LTAs
are
model­
based,
they
are
not
necessarily
the
same
as
averages.
EPA
notes
that
LTAs
for
BOD
5
and
TSS
for
facility
307a
are
just
slightly
higher
than
the
mean
concentrations
provided
in
Table
1
(
i.
e.
the
BOD
5
LTA
=
7.98
mg/
L
and
the
TSS
LTA
=
10.2
mg/
L.)
Using
the
methodology
described
in
Chapter
14
and
multiplying
the
LTA's
by
the
variability
factors
for
facility
307a,
the
BOD5
daily
maximum
limit
16
7.98
mg/
L
*
3.25
=
26
mg/
L
and
the
monthly
average
is
7.98
mg/
L
*
1.96
=
16
mg/
L.
The
TSS
daily
maximum
limit
is
10.2
mg/
L
*
2.94
=
30
mg/
L
and
the
monthly
average
is
10.2
*
1.87
=
20
mg/
L.
These
limit
numbers
have
all
been
rounded
up
to
the
nearest
integer.
