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{longname} Q77. For a unit that has an O2 monitor and doesn't meet the conditions required to use Tier 4, but elects to use Tier 4, what are the monitoring requirements? {longname} |
A77.
...
If
...
a
...
facility
...
elects
...
to
...
use
...
Tier
...
4,
...
then
...
all
...
of
...
the
...
Tier
...
4
...
requirements
...
must
...
be
...
met.
...
In
...
this
...
case,
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a
...
stack
...
flow
...
monitor
...
must
...
be
...
installed
...
and
...
certified,
...
and
...
the
...
O2
...
monitor
...
may
...
be
...
used
...
in
...
lieu
...
of
...
installing
...
and
...
certifying
...
a
...
CO2
...
monitor,
...
provided
...
that:
...
(1)
...
only
...
fuels
...
listed
...
in
...
Table
...
1
...
in
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section
...
3.3.5
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of
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Part
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75,
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Appendix
...
F
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are
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combusted
...
in
...
the
...
unit;
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and
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(2)
...
the
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effluent
...
stream
...
does
...
not
...
include
...
any
...
CO2
...
emissions
...
from
...
non-combustion
...
processes
...
or
...
emission
...
control
...
systems.
...
(See
...
§98.33(a)(4)(iv)).
...
However,
...
the
...
relative
...
accuracy
...
test
...
audit
...
(RATA)
...
of
...
the
...
O2
...
monitor
...
must
...
be
...
conducted
...
on
...
a
...
%CO2
...
basis
...
comparing
...
the
...
calculated
...
CO2
...
concentrations
...
to
...
the
...
concentrations
...
measured
...
by
...
the
...
CO2
...
reference
...
method.
...
(See
...
§98.34(c)(2).)
...
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{info}
Source: This question and answer was derived from a Legacy FAQ, revised by M. Hannan, 1/23/2013
Approval / Publishing History: Version 2, approved by L. Grogan-McCulloch, 2/13/2013
Expiration: none
Relevant Subparts: Subpart C
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