Im an ROP facility and I have a grandfathered emission unit below the 10% significant levels in Rule 278, do they need to be included in MAERS?
A grandfathered emission unit is an emission unit that was installed before August 15, 1967 , that is not covered by a permit exemption in Rules 279-290, and that was never modified, reconstructed, or relocated after August 15, 1967 . All grandfathered emission units must be included in MAERS. If the emission unit was installed prior to August 15, 1967 but is covered by one of the permit exemptions and is not excluded from exemption per Rule 278, then it is not considered a grandfathered emission unit with respect to MAERS. This emission unit should be included in MAERS if it meets any of the following: It is located at an ROP subject facility; Its emissions exceed 10% of the significant thresholds; or, it is identified in and meets the criteria in the Rule 201 Exemption List found in the Emissions Unit Instructions.
A grandfathered emission unit is an emission unit that was installed before August 15, 1967 , that is not covered by a permit exemption in Rules 279-290, and that was never modified, reconstructed, or relocated after August 15, 1967. All grandfathered emission units must be included in MAERS. If the emission unit was installed prior to August 15, 1967 but is covered by one of the permit exemptions and is not excluded from exemption per Rule 278, then it is not considered a grandfathered emission unit with respect to MAERS. This emission unit should be included in MAERS if it meets any of the following: It is located at an ROP subject facility; Its emissions exceed 10% of the significant thresholds; or, it is identified in and meets the criteria in the Rule 201 Exemption List found in the Emissions Unit Instructions.
