Rule 226. The health-based screening level requirement
provided in
R 336.1225(1) does
not apply to any of the following:
(a)
Emissions of a toxic air contaminant that meet both of the following
requirements:
(i) The emission rate is less
than 10 pounds per month and 0.14 pound per hour.
(ii) The toxic air contaminant is not a
carcinogen or a high concern toxic air contaminant listed in Table 20.
Table 20. List of High Concern Toxic Air Contaminants
|
CHEMICAL NAME
|
CAS NUMBER
|
|
2,4,6-trinitrotoluene (TNT)
|
118-96-7
|
|
2-diethylaminoethanol
|
100-37-8
|
|
Acrolein
|
107-02-8
|
|
allyl chloride
|
107-05-1
|
|
alpha chloroacetophenone
|
532-27-4
|
|
alpha-amylase
|
9000-90-2
|
|
antimony
compounds1
|
|
Arsine
|
7784-42-1
|
|
barium compounds1
|
|
Biphenyl
|
92-52-4
|
|
Bromine
|
7726-95-6
|
|
chlorine dioxide
|
10049-04-4
|
|
chlormadinone acetate
|
302-22-7
|
|
chlorpyrifos
|
2921-88-2
|
|
cobalt compounds1
|
|
Colophony
|
8050-09-7
|
|
dibromochloropropane
|
96-12-8
|
|
dibutyltin oxide
|
818-08-6
|
|
Dichlorvos
|
62-73-7
|
|
diisocyanate
compounds1,2
|
|
dimethyl sulfate
|
77-78-1
|
|
glutaraldehyde
|
111-30-8
|
|
halogenated dimethylhydantoin
compounds3
|
|
isocyanate
compounds1,4
|
|
maleic anhydride
|
108-31-6
|
|
manganese
compounds1
|
|
melengesterol acetate
|
2919-66-6
|
|
mercury
compounds1
|
|
octachlorostyrene
|
29082-74-7
|
|
osmium tetroxide
|
20816-12-0
|
|
pentachlorobenzene
|
608-93-5
|
|
platinum soluble salt
|
7440-06-4
|
|
selenium
compounds1
|
|
Subtilisins (proteolytic
enzymes)5
|
|
sulfuric acid (including sulfur trioxide and
oleum)
|
7664-93-9
|
|
tetrachlorobenzene
compounds6
|
|
thallium
compounds1
|
|
Vanadium pentaoxide
|
1314-62-1
|
1 These listings include any
unique chemical substance that contains the named chemical (for example,
antimony, barium, cobalt, diisocyanate, isocyanate, manganese, mercury,
selenium, and thallium) as part of the chemical structure.
2 Diisocyanate compounds include
compounds with 2 of the isocyanate functional groups (-CNCO).
3 Halogenated dimethylhydantoin
compounds includes those compounds with a hydantoin infrastructure
(NHC0NHC0CH2) substituted by 2 methyl groups at the 5 position on the ringed
structure and halogens at the 1 or 3 position or the 1 and 3 position.
4 Isocyanate compounds includes
compounds with 1 or more of the isocyanate functional groups (CNCO).
5 Subtilisins (proteolytic
enzymes) includes any members of the group of proteolytic enzymes derived from
Bacillus subtilis or closely related organisms.
6 Tetrachlorobenzenes includes
compounds that consist of a benzene ring substituted with 4 chlorine
atoms.
(b) An
emission unit or units for which standards have been promulgated under section
112(f) of the clean air act for hazardous air pollutants listed under section
112(b) of the clean air act.
(c)
Air contaminants and emission units that are regulated by the following
national emission standards for hazardous air pollutants, 40 C.F.R. part
61:
(i) Subpart B, National emission standard for
radon emissions from underground uranium mines.
(ii) Subpart C, National emission standards
for beryllium.
(iii) Subpart D,
National emission standard for beryllium rocket motor firing.
(iv) Subpart E, National emission standard
for mercury.
(v) Subpart F,
National emission standard for vinyl chloride.
(vi) Subpart H, National emission standard
for emissions of radionuclide from department of energy facilities.
(vii) Subpart I, National emission standard
for radionuclide emissions from federal facilities other than nuclear
regulatory commission licensees and not covered by subpart H.
(viii) Subpart J, National emission standard
for equipment leaks (fugitive emission sources) of benzene.
(ix) Subpart K, National emission standard
for radionuclide emissions from elemental phosphorus plants.
(x) Subpart L, National emission standard for
benzene emissions from coke byproduct recovery plants.
(xi) Subpart M, National emission standard
for asbestos.
(xii) Subpart N,
National emission standard for inorganic arsenic emissions from glass
manufacturing plants.
(xiii)
Subpart O, National emission standard for inorganic arsenic emissions from
primary copper smelters.
(xiv)
Subpart P, National emission standard for inorganic arsenic emissions from
arsenic trioxide and metallic arsenic production facilities.
(xv) Subpart V, National emission standard
for equipment leaks (fugitive emission sources).
(xvi) Subpart W, National emission standard
for radon emissions from licensed uranium mill tailings.
(xvii) Subpart Y, National emission standard
for benzene emissions from benzene storage vessels.
(xviii) Subpart BB, National emission
standards for benzene emissions from benzene transfer operations.
(xix) Subpart FF, National emission standards
for benzene waste operations.
(d) Emissions of a toxic air contaminant if
it is demonstrated, on a case-by-case basis, to the satisfaction of the
department, that the proposed new or modified emission unit or units will not
cause or contribute to a violation of the provisions of
R 336.1901. The demonstration shall
include all relevant scientific information such as the following:
(i) All available information on the health
effects of the toxic air contaminant.
(ii) The levels at which adverse health or
environmental effects have occurred.
(iii) Net air quality benefits that would
occur as a result of replacing an existing facility.
(iv) Actual exposure levels and duration of
exposure.
(v) The uncertainty in
data or analysis.
(vi) Other
supporting information requested by the department.
(e) Engines, turbines, boilers, and process
heaters burning solely natural gas, diesel fuel (No. 2 fuel oil), or biodiesel,
of up to 100 MMBTU per hour, provided that the effective stack is vertical and
unobstructed and is at least 1.5 times the building height, and the building
setback is at least 100 feet from the property line.
(f) Natural gas fuel burning equipment or
natural gas fired equipment that meet all the following:
(i) A maximum natural gas usage rate of
50,000 cubic feet per hour or less.
(ii) Emissions from the source are discharged
from an unobstructed stack oriented vertically upwards.
(iii) With a stack height at least 1.5 times
the height of the building most influential in determining the predicted
ambient impacts of the emissions.
(g) Air pollution control equipment that
combusts only natural gas as fuel.
