Mich. Admin. Code R. 336.1225 - Health-based screening level requirements for new or modified sources of air toxics
Rule 225.
(1) A
person who is responsible for any proposed new or modified emission unit or
units for which an application for a permit to install is required by
R
336.1201 and which emits a toxic air contaminant shall
not cause or allow the emission of the toxic air contaminant from the proposed
new or modified emission unit or units in excess of the maximum allowable
emission rate which results in a predicted maximum ambient impact that is more
than the initial threshold screening level or the initial risk screening level,
or both, except as provided in subrules (2) and (3) of this rule and in
R 336.1226.
(2) As an alternative to complying with the
initial risk screening level in subrule (1) of this rule, a person may instead
demonstrate compliance with the secondary risk screening level. For the purpose
of complying with the secondary risk screening level, the total allowable
emissions of the carcinogen from the proposed new or modified emission unit or
units and all existing emission units at the stationary source shall not result
in a maximum ambient impact that is more than the secondary risk screening
level.
(3) If the ambient impacts
of a carcinogen occur on industrial property or public roadways, as an
alternative to complying with subrule (1) or (2) of this rule, a person may
instead demonstrate compliance with either of the following provisions:
(a) The maximum allowable emission rate of
the carcinogen from the proposed new or modified emission unit or units results
in ambient impacts that meet both of the following requirements:
(i) The maximum ambient impact on industrial
property or public roadways is less than or equal to the initial risk screening
level multiplied by a factor of 10.
(ii) The maximum ambient impact on all
property that is not industrial or a public roadway is less than or equal to
the initial risk screening level.
(b) The total allowable emissions of the
carcinogen from the proposed new or modified emission unit or units and all
existing emission units at the stationary source result in ambient impacts that
meet both of the following requirements:
(i)
The maximum ambient impact on industrial property or public roadways is less
than or equal to the secondary risk screening level multiplied by a factor of
10.
(ii) The maximum ambient impact
on all property that is not industrial or a public roadway is less than or
equal to the secondary risk screening level.
(4) Any owner or operator who utilizes the
alternative criteria provided in subrule (3) of this rule shall notify the
department if a change in land use occurs for property determined to be
industrial or a public roadway. The notification shall be submitted to the
department within 30 days of the actual land use change. Within 60 days of the
land use change, the owner or operator shall submit to the department a plan
for complying with the requirements of subrule (1) of this rule. The plan shall
require compliance with subrule (1) of this rule not later than 1 year after
the due date of the plan submittal.
(5) For the purposes of this rule, industrial
property includes only property where the activities are industrial in nature,
for example, manufacturing, utilities, industrial research and development, or
petroleum bulk storage. The term industrial property does not include farms or
commercial establishments.
(6) For
the purpose of subrules (1), (2), and (3) of this rule, both of the following
provisions apply:
(a) All polychlorinated
dibenzodioxins and dibenzofurans shall be considered as 1 toxic air
contaminant, expressed as an equivalent concentration of
2,3,7,8-tetrachlorodibenzo-p-dioxin, based upon the relative potency of the
isomers emitted from the emission unit or units.
(b) If 2 or more toxic air contaminants are
present and known to result in toxicological interaction, then the interactive
effects shall be considered in establishing initial threshold screening levels,
initial risk screening levels, and secondary risk screening levels.
Notes
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