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 446.22 - Monitoring of emissions and operations

Current through June 24, 2024
(1) All wastewater
				  treatment plant sludge incineration and drying plants for which mercury
				  emissions exceed 1.6 kg (3.5 lbs) per 24-hour period, demonstrated either by
				  stack sampling or sludge sampling according to s.
				  NR
				  446.21(4), shall monitor mercury
				  emissions at intervals of at least once per year in accordance with Method 105
				  and the procedures specified in s.
				  NR
				  446.21(4) (f). The results of
				  monitoring shall be reported to the department by registered letter dispatched
				  before the close of the next business day following the monitoring. The results
				  shall be retained at the source and shall be made available for inspection by a
				  department representative for a minimum of 2 years.
(2) The owner or operator of each mercury
				  cell chlor-alkali plant-hydrogen and end-box ventilation gas streams shall:
(a) Perform a mercury emission test that
				  demonstrates compliance with the emission limits in s.
				  NR
				  446.20(1) on the hydrogen stream by
				  Method 102 and on the end-box stream by Method 101 for the purpose of
				  establishing limits for parameters to be monitored, within one year after June
				  1, 1994 or within one year of startup for a plant with initial startup after
				  February 1, 1984.
(b) Monitor and
				  record manually or automatically at least once every 15 minutes during the
				  tests specified in par. (a) all of the following control device parameters,
				  except as provided in par. (c):
1. The exit
				  gas temperature from uncontrolled streams.
2. The outlet temperature of the gas stream
				  for the final cooling system when no control devices other than coolers and
				  demisters are used.
3. The outlet
				  temperature of the gas stream from the final cooling system when the cooling
				  system is followed by a molecular sieve or carbon adsorber.
4. Outlet concentration of available
				  chlorine, pH, liquid flow rate and inlet gas temperature of chlorinated brine
				  scrubbers and hypochlorite scrubbers.
5. The liquid flow rate and exit gas
				  temperature for water scrubber.
6.
				  The inlet gas temperature of carbon adsorption systems.
7. The temperature during the heating phase
				  of the regeneration cycle for carbon adsorbers or molecular sieves.
(c) Average the parameters
				  recorded in par. (b) over a minimum 6 hour test period. The highest temperature
				  reading that is measured in par. (b) 7. is to be identified as the reference
				  temperature for use in par. (f) 2.
(d) Monitor and record manually or
				  automatically immediately after the completion of the emission tests specified
				  in par. (a) the following:
1. The parameters
				  specified in par. (b) 1. to 6. at least once per hour.
2. The temperature specified in par. (b) 7.
				  during each heating phase of the regeneration cycle.
(e) Operate, maintain and calibrate
				  monitoring devices according to the manufacturer's instructions. Monitoring
				  devices used in accordance with pars. (b) and (d) shall be certified by their
				  manufacturer to be accurate to within 10%. Records of the certifications and
				  calibrations shall be retained at the chlor-alkali plant and made available for
				  inspection by the department as follows: certification, for as long as the
				  device is used for this purpose; and calibration, for a minimum of 2
				  years.
(f) Notify the department
				  within 10 days when:
1. The hourly value of a
				  parameter monitored in accordance with par. (d) 1. exceeds, or, in the case of
				  liquid flow rate and available chlorine, falls below, the value of that same
				  parameter determined in par. (b) for 24 consecutive hours, and
2. The maximum hourly value of the
				  temperature measured in accordance with par. (d) 2. is below the reference
				  temperature recorded according to par. (c) for 3 consecutive regeneration
				  cycles.
(g) Submit
				  semiannual reports to the department indicating the time and date on which the
				  hourly value of each parameter monitored according to par. (d) 1. and 2. fell
				  outside the value of that same parameter determined under par. (c) and
				  corrective action taken, and the time and date of the corrective action.
				  Parameter excursions shall be considered unacceptable operation and maintenance
				  of the emission control system. In addition, while compliance with the emission
				  limits is determined primarily by conducting a performance test according to
				  the procedures in s.
				  NR
				  446.21(2), reports of parameter
				  excursions may be used as evidence in judging the duration of a violation that
				  is determined by a performance test.
(h) Submit semiannual reports required in
				  par. (g) to the department on September 15 and March 15 of each year. The first
				  semiannual report is to be submitted following the first full 6 month reporting
				  period. The semiannual reports due on September 15 and March 15 shall include
				  all excursions monitored during the 6 calendar months previous to the report
				  date.