NR 460.02(23s) (23s) “Major changes to recordkeeping and reporting” means:

NR 460.02(23s)(a) (a) A modification to federally required recordkeeping or reporting that meets one of the following criteria:

NR 460.02(23s)(a)1. 1. May decrease the stringency of the required compliance and enforcement measures for the relevant standards.

NR 460.02(23s)(a)2. 2. May have national significance.

NR 460.02(23s)(a)3. 3. Is not site-specific.

NR 460.02(23s)(b) (b) Examples of major changes to recordkeeping and reporting include, but are not limited to:

NR 460.02(23s)(b)1. 1. Decreases in the record retention for all records.

NR 460.02(23s)(b)2. 2. Waiver of all or most recordkeeping or reporting requirements.

NR 460.02(23s)(b)3. 3. Major changes to the contents of reports.

NR 460.02(23s)(b)4. 4. Decreases in the reliability of recordkeeping or reporting, such as manual recording of monitoring data instead of required automated or electronic recording or paper reports where electronic reporting may have been required.

NR 460.02(24) (24) “Major source” means any stationary source or group of stationary sources located within a contiguous area and under common control that emits or has the potential to emit considering controls, in the aggregate, 10 tons per year or more of any hazardous air pollutant or 25 tons per year or more of any combination of hazardous air pollutants, unless the administrator establishes a lesser quantity, or in the case of radionuclides, different criteria from those specified in this definition.

NR 460.02(24c) (24c) “Malfunction” means any sudden, infrequent and not reasonably preventable failure of air pollution control and monitoring equipment, process equipment, or a process to operate in a normal or usual manner which causes, or has the potential to cause, the emission limitations in an applicable standard to be exceeded. Failures that are caused in part by poor maintenance or careless operation are not malfunctions.

NR 460.02(24e) (24e) “Minor alternative monitoring” means:

NR 460.02(24e)(a) (a) Federally required monitoring with modifications that meet all of the following criteria:

NR 460.02(24e)(a)1. 1. Do not decrease the stringency of the compliance and enforcement measures for the relevant standard.

NR 460.02(24e)(a)2. 2. Have no national significance.

NR 460.02(24e)(a)3. 3. Are site-specific, made to reflect or accommodate the operational characteristics, physical constraints or safety concerns of an affected source.

NR 460.02(24e)(b) (b) Examples of minor modifications to monitoring include, but are not limited to:

NR 460.02(24e)(b)1. 1. Modifications to a sampling procedure, such as use of an improved sample conditioning system to reduce maintenance requirements.

NR 460.02(24e)(b)2. 2. Increased monitoring frequency.

NR 460.02(24e)(b)3. 3. Modification of the environmental shelter to moderate temperature fluctuation and thus protect the analytical instrumentation.

NR 460.02(24m) (24m) “Minor change to a test method” means:

NR 460.02(24m)(a) (a) A modification to a federally enforceable test method that meets all of the following criteria:

NR 460.02(24m)(a)1. 1. Does not decrease the stringency of the emission limitation or standard.

NR 460.02(24m)(a)2. 2. Has no national significance.

NR 460.02(24m)(a)3. 3. Is site-specific, made to reflect or accommodate the operational characteristics, physical constraints or safety concerns of an affected source.

NR 460.02(24m)(b) (b) Examples of minor changes to a test method include, but are not limited to:

NR 460.02(24m)(b)1. 1. Field adjustments in a test method’s sampling procedure, such as a modified sampling traverse or location to avoid interference from an obstruction in the stack, increasing the sampling time or volume, use of additional impingers for a high moisture situation, accepting particulate emission results for a test run that was conducted with a lower than specified temperature, substitution of a material in the sampling train that has been demonstrated to be more inert for the sample matrix.

NR 460.02(24m)(b)2. 2. Changes in recovery and analytical techniques such as a change in quality control or quality assurance requirements needed to adjust for analysis of a certain sample matrix.