Md. Code Regs. 26.11.16.02 - Demonstrating Compliance with COMAR 26.11.15.06
A. Screening Analysis.
(1) Carcinogenic Effects. A person may
demonstrate that emissions of a Class I TAP from a premises will not
unreasonably endanger human health because of potential carcinogenic effects by
a screening analysis showing that total allowable emissions from the premises
will not cause increases in ambient levels that exceed the risk-based screening
level for the TAP.
(2) Other Toxic
Effects.
(a) A person may demonstrate that
emissions of a Class I or Class II TAP from a premises do not unreasonably
endanger human health because of potential toxic effects other than cancer by a
screening analysis showing that total allowable emissions from the premises
will not cause increases in ambient levels that exceed applicable TLV-based,
threshold-based, or special screening levels.
(b) If a special screening level has been
adopted, a TLV-based or threshold-based screening level may not be used for
that TAP. A threshold-based screening level may be used only if there is no
TLV, no special screening level, and no acceptable ambient level for a
TAP.
(3) For a screening
analysis, a person may use the dispersion modeling procedures in Air Management
Administration Technical Memorandum 86-02 (TM 86-02), "Ambient Air Quality
Impact Screening Analysis for Toxic Air Pollutants", which is incorporated by
reference, or other, more rigorous dispersion modeling procedures as provided
in §C(1)(a) of this regulation. If concentrations predicted using TM 86-02
exceed applicable screening levels, more rigorous modeling techniques should be
used in either a screening analysis or a more detailed analysis.
(4) Instead of using dispersion modeling, a
person may conduct a screening analysis by showing that total allowable
emissions of a TAP will be less than the most stringent applicable emission
rate listed in the tables in this section. Multiple screening levels with
different averaging periods may apply to a TAP. These tables may not be used
with screening levels having averaging periods other than those listed in the
tables. Emission rates labeled "10 Meter Stacks, No Downwash" may be used only
if all emissions of the TAP are discharged from a stack or stacks at least 32.8
feet (10 meters) high under conditions preventing downwash. (TM 86-02 describes
conditions causing downwash.) Except as provided in COMAR
26.11.15.06 a, these emission
rates apply to the total allowable emissions from a premises.
B. Second Tier Analysis.
(1) Carcinogenic Effects. A person may
demonstrate that emissions of a Class I TAP from a premises will not
unreasonably endanger human health because of potential carcinogenic effects by
a second tier analysis showing that total allowable emissions from the premises
will not cause increases in ambient levels that exceed an insignificant risk
concentration (IRC) for the TAP, or by an approvable request for a special
permit under Regulation .05 of this chapter. A second tier analysis would be
appropriate if new information is available concerning carcinogenic
dose-response relationships. A special permit should be requested if a person
wishes to more accurately characterize exposure, to justify approval of risks
greater than 1 x 10-5, or to otherwise modify
assumptions to more accurately represent risks.
(2) Other Toxic Effects. A person may
demonstrate that emissions of a Class I or Class II TAP from a premises will
not unreasonably endanger human health because of toxic effects other than
cancer by a second tier analysis showing that total allowable emissions from
the premises will not contribute to concentrations exceeding the applicable
acceptable ambient level (AAL) for the TAP.
C. General Procedures for Compliance
Demonstrations.
(1) Dispersion Modeling
Procedures Required.
(a) A person using
dispersion modeling to demonstrate compliance with COMAR
26.11.15.06 a shall use procedures
approved by the Department. The Department will approve dispersion modeling
procedures that are consistent with the U.S. Environmental Protection Agency's
guidance on dispersion modeling.
(b) For second tier analysis showing that
total allowable emissions from a premises will not contribute to concentrations
exceeding an acceptable ambient level, a person shall use available emissions
data to model ambient impacts caused by other sources of the Class II TAP
within 5 kilometers (3.1 miles) of the premises. The Department will assist
persons modeling ambient concentrations for comparison to AALs by providing
available information on emissions from other sources or on background levels.
The Department may provide additional assistance as resources permit.
(2) Averaging Times. To
demonstrate compliance with this chapter, a person shall use the averaging time
consistent with the applicable screening level, AAL, or IRC unless the
Department requires the use of a shorter averaging time. The Department will
require that a shorter averaging time be used if it determines that the
operating procedures of the source may cause a high concentration of a TAP for
a short period and that consideration of potential health effects due to peak
exposures may be warranted for the TAP.
Screening Level | Premises Emission Rate (10 Meter Stacks and No Downwash) | Premises Emission Rate (Shorter Stack, Possible Downwash, or Fugitive) | ||
Annual (micro-grams/ cubic meter) | (lb./yr.) | (kg/yr.) | (lb./yr.) | (kg/yr.) |
0.001-0.0099 | 1.66 | 0.75 | 0.36 | 0.16 |
0.01-0.099 | 16.64 | 7.53 | 3.65 | 1.65 |
0.1-0.99 | 166.44 | 75.39 | 36.52 | 16.54 |
1.0-10 | 1664.40 | 753.97 | 365.29 | 165.47 |
Greater than 10 | 16644.00 | 7539.73 | 3652.92 | 1654.77 |
8-Hour or 1-Hour (micrograms/ cubic meter) | (lb./hr.) | (kg/hr.) | (lb./hr.) | (kg/hr.) |
1-9.9 | 0.01 | 0.007 | 0.003 | 0.001 |
10-29.9 | 0.16 | 0.07 | 0.04 | 0.01 |
30-59.9 | 0.49 | 0.22 | 0.10 | 0.04 |
60-99.9 | 0.98 | 0.44 | 0.21 | 0.09 |
100-129.9 | 1.60 | 0.70 | 0.36 | 0.16 |
130-250 | 2.12 | 1.00 | 0.46 | 0.21 |
Greater than 250 | 4.07 | 1.80 | 0.89 | 0.40 |
Notes
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No prior version found.