Wisconsin Administrative Code
Department of Natural Resources
NR 400-499 - Environmental Protection - Air Pollution Control
Chapter NR 446 - Control Of Mercury Emissions
Subchapter IV - Mercury Emission Standards for Other Sources
Section NR 446.21 - Stack sampling
Universal Citation: WI Admin Code ยง NR 446.21
Current through August 26, 2024
(1) MERCURY ORE PROCESSING FACILITIES.
(a) Unless a waiver of emission testing is
requested and obtained from the department, each owner or operator of a
facility processing mercury ore on which construction or modification commenced
after February 1, 1984 shall test emissions from the source in accordance with
Method 101 within 90 days after startup.
(b) The department shall be notified at least
30 days prior to a stack or performance test to afford it the opportunity to
have a representative present to witness the testing procedures. The notice
shall include a test plan in accordance with s.
NR 439.07.
(c) Samples shall be taken over such a period
as is necessary to accurately determine the maximum emissions which will occur
in a 24-hour period. No changes in the operation may be made which would
potentially increase emissions above that determined by the most recent source
test until the new emission level has been estimated by calculation and the
results reported to the department.
(d) All samples shall be analyzed, and
mercury emissions shall be determined within 30 days after the source test.
Each determination shall be reported to the department by registered letter
dispatched before the close of the next business day following the
determination.
(e) Records of
emission test results and other data needed to determine total emissions shall
be retained at the source and made available for inspection by a department
representative for a minimum of 2 years.
(2) MERCURY CHLOR-ALKALI PLANTS-HYDROGEN AND END BOX VENTILATION GAS STREAMS.
(a) Unless a
waiver of emission testing is requested and obtained from the department, each
owner or operator of a mercury chlor-alkali cell on which construction or
modification commenced after February 1, 1984 shall test emissions from
hydrogen streams in accordance with Method 102 and from end-box gas streams in
accordance with Method 101 within 90 days after startup.
(b) The department shall be notified at least
30 days in advance of stack or performance tests to afford it the opportunity
to have a representative present to witness the testing procedures. The notice
shall include a test plan in accordance with s.
NR 439.07.
(c) Samples shall be taken over such a period
as is necessary to accurately determine the maximum emissions which will occur
in a 24-hour period. No changes in the operation may be made which would
potentially increase emissions above that determined by the most recent source
test until the new emission level has been estimated by calculation and the
results reported to the department.
(d) All samples shall be analyzed, and
mercury emissions shall be determined within 30 days after the source test. All
determinations shall be reported to the department by registered letter
dispatched before the close of the next business day following the
determination.
(e) Records of
emissions test results and other data needed to determine total emissions shall
be retained at the source and made available for inspection by a department
representative for a minimum of 2 years.
(3) MERCURY CHLOR-ALKALI PLANTS-CELL ROOM VENTILATION SYSTEM.
(a) Stationary sources
using mercury chlor-alkali cells may test cell room emissions in accordance
with par. (b), or demonstrate compliance with par. (d) and assume ventilation
emissions of 1.3 kg (2.9 lbs) per day of mercury.
(b) Unless a waiver of emission testing is
requested and obtained from the department, each owner or operator of a new or
modified chlor-alkali plant shall pass all cell room air in forced gas streams
through stacks suitable for testing and shall test emissions from the cell room
in accordance with Method 101 within 90 days after startup.
(c) The department shall be notified at least
30 days in advance of stack or performance tests to afford it the opportunity
to have a representative present to witness the testing procedures. The notice
shall provide a test plan in accordance with s.
NR 439.07.
(d) An owner or operator may carry out U.S.
environmental protection agency approved design, maintenance and housekeeping
practices.
Note: A list of approved practices is provided in appendix A of "Review of National Emission Standards for Mercury," EPA-450/3-84-014, December 1984, incorporated by reference in s. NR 484.05(9).
(4) SLUDGE INCINERATION AND DRYING PLANTS.
(a) Unless a waiver of emission
testing is requested and obtained from the department, each owner or operator
of sludge incineration plants and drying plants on which construction or
modification commenced after February 1, 1984 shall test emissions from the
source within 90 days of startup. The tests shall be conducted in accordance
with Method 101A, using the procedures in par. (f).
(b) The department shall be notified at least
30 days in advance of stack or performance tests to afford it the opportunity
to have a representative present to witness the testing procedures. The notice
shall include a test plan in accordance with s.
NR 439.07.
(c) Samples shall be taken over such a period
as is necessary to determine accurately the maximum emissions which will occur
in a 24-hour period. No changes may be made in the operation which would
potentially increase emissions above the level determined by the most recent
stack tests until the new emission level has been estimated by calculation and
the results reported to the department.
(d) All samples shall be analyzed, and
mercury emissions shall be determined within 30 days after the stack test. All
determinations shall be reported to the department by registered letter
dispatched before the close of the next business day following the
determination.
(e) Records of
emission test results and other data needed to determine total emissions shall
be retained at the source and shall be made available for inspection by a
department representative for a minimum of 2 years.
(f) If an owner or operator uses Method 105,
the following procedures shall be adhered to:
1. The sludge shall be sampled after
dewatering and before incineration or drying, at a location that provides a
representative sample of the sludge that is charged to the incinerator or
dryer. Eight consecutive grab samples shall be obtained at intervals of between
45 and 60 minutes and thoroughly mixed into one sample. Each of the 8 grab
samples shall have a volume of at least 200 milliliters but not more than 400
milliliters. A total of 3 composite samples shall be obtained within an
operating period of 24 hours. When the 24-hour operating period is not
continuous, the total sampling period may not exceed 72 hours after the first
grab sample is obtained. Samples may not be exposed to any condition that may
result in mercury contamination or loss.
2. The maximum 24-hour period sludge
incineration or drying rate shall be determined by use of a flow rate
measurement device that can measure the mass rate of sludge charged to the
incinerator or dryer with an accuracy of plus or minus 5% over its operating
range. Other methods of measuring sludge mass charging rates may be used if
they have received prior approval by the department.
3. The handling, preparation and analysis of
sludge samples shall be accomplished in accordance with Method 105.
4. The mercury emissions shall be determined
by use of the following equation:
where: EHg is the mercury emissions, g/day
M is the mercury concentration of sludge on a dry solids basis, µg/g
Q is the sludge charging rate, kg/day
Fsm(avg) is the average weight fraction of solids in the collected sludge after mixing
1000 is the conversion factor, kg µg/g2
5. No changes in the operation of a plant may
be made after a sludge test has been conducted which would potentially increase
emissions above the level determined by the most recent sludge test, until the
new emissions level has been estimated by calculation and the results reported
to the department.
6. All sludge
samples shall be analyzed for mercury content within 30 days after the sludge
sample is collected. Each determination shall be reported to the department by
registered letter dispatched before the close of the next business day
following the determination.
7.
Records of sludge sampling, charging rate determination and other data needed
to determine mercury content of wastewater treatment plant sludges shall be
retained at the source and made available for inspection by a department
representative for a minimum of 2 years.
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