Section 336.1226. Exemptions from the health-based screening level requirement.

Rule 226.  The health-based screening level requirement provided in R 336.1225(1) shall 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

¹These 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 (NHCONHCOCH2) 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 promulgated on or before November 14, 1990, under section 112 of the clean air act, as amended, 42 U.S.C.  §7401 et seq.:

(i)       Subpart  B  -  National  emission  standard   for  radon-222  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 radionuclide emissions from department of energy facilities. (vii) Subpart I - National emission standard for radionuclide emissions from facilities licensed by the nuclear regulatory commission and federal facilities 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-by-product 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-222  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.

History: 1998-2000 AACS.