For the purposes of the PSD increment impact analysis in support of provisions of Subparts 231-7 and 231-8 of this Part, the following significant impact levels will be used to determine whether a new or modified facility will have a significant air quality impact in Federal class I areas:

An analysis demonstrating that the maximum impacts from the proposed new or modified facility for any regulated NSR contaminant are below these significant impact levels in PSD defined class I areas will be deemed adequate as the required impact analysis to demonstrate that the source will not contribute to a standards violation or a PSD increment exceedance for that regulated NSR contaminant. However, such a demonstration will not exclude the performance of any other required impact analysis to satisfy other applicable provisions of Subparts 231-7 to 231-10 of this Part, including the modeling for air quality related values in Federal class I areas.