Off-permit definition
Off-permit means certain changes can be made at a source that result in new applicable requirements but do not need to be incorporated into the ROP until the renewal period of the permit. This category includes changes that involve a new emission unit that requires a Permit to Install (PTI) or new emission unit exempt from Permit to Install but subject to a New Source Performance Standard (NSPS) or a Maximum Achievable Control Technology (MACT) standard.