(a) If the estimated annual mercury mass emissions are 464 ounces per year or less,
the unit is eligible to use the monitoring methodology of this rule, and mercury
continuous emission monitoring is not required.
(b) The results of the testing performed under this rule shall be submitted as a
certification application to the department, not later than 45 days after the test is
completed. The calculations demonstrating that the unit emits less than 464 ounces per
year shall be provided, and the default mercury concentration that will be used for
mercury mass emission reporting shall be specified.
(c) Following initial certification the following steps shall be taken:
(i) The default mercury concentration used to estimate the unit's annual mercury
mass emissions shall be reported for each unit operating hour and shall be used to
calculate hourly mercury emissions.
(ii) The mercury emission testing described in this rule shall be repeated periodically
for the purpose of quality assurance, as follows:
(A) If the results of the certification testing under this rule show that the unit emits
144 ounces (9 pounds) per year or less, the first retest is required by the end of the fourth
quarter following the calendar quarter of the certification test.
(B) If the results of the certification test under this section show that the unit emits
more than 144 ounces per year but less than 464 ounces per year, the first retest is
required by the end of the second quarter following the calendar quarter of the
certification test.
(C) Retesting shall be required either by the end of the second or fourth quarter
following the quarter of the previous test, depending on the results of the previous test.
To determine whether the next retest is required within 2 or 4 quarters, substitute the
highest mercury concentration from the current test or 0.50 µg/scm, whichever is greater,
into the equation under subrule (3) of the rule. If the estimated annual mass emissions
exceed 144 ounces, the next test is due within 2 quarters. If the estimated annual mass
emissions are 144 ounces or less, the next test is due within 4 quarters.
(d) The updated mercury default concentration shall be applied beginning with the
first unit operating hour after the completion of the retest.
(e) If the unit is equipped with flue gas desulfurization system or add-on mercury
controls, the owner or operator shall record the parametric data for each unit operating
hour.
(f) An additional retest is required when there is a change in coal rank of the primary
fuel or other significant fuel change.
(g) At the end of each calendar year, if the cumulative annual mercury mass
emission from an affected unit exceeds 464 ounces, the owner or operator shall install,
certify, operate, and maintain a mercury continuous emission monitoring system, or
sorbent trap monitoring system, not later than 180 days after the end of the calendar year
in which the emissions exceeded 464 ounces.
History: 2009 AACS; 2014 AACS.
R 336.2161 Rescinded.
History: 2009 AACS; 2014 AACS.
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