; (B) provide an opportunity for the owner or operator to submit a proposed plan amendment to address directly the changed condition; and (C) allow the owner or operator to continue to implement those elements of the approved plan that do not directly and adversely affect the condition precipitating the need for modification. (4) Categorical exclusion process The Secretary and the Secretary of Agriculture shall apply his or her categorical exclusion process under the National Environmental Policy Act of 1969 ( 42 U.S.C. 4321 et seq.) to plans developed under this subsection on existing transmission and distribution rights-of-way under this subsection. (5) Implementation A plan approved under this subsection shall become part of the authorization governing the covered right-of-way and hazard trees adjacent to the right-of-way. If a vegetation management plan is proposed for an existing transmission and distribution facility concurrent with the siting of a new transmission or distribution facility, necessary reviews shall be completed as part of the siting process or sooner. Once the plan is approved, the owner or operator shall provide the agency with only a notification of activities anticipated to be undertaken in the coming year, a description of those activities, and certification that the activities are in accordance with the plan. (6) Definitions In this subsection: (A) Vegetation management, facility inspection, and operation and maintenance plan The term vegetation management, facility inspection, and operation and maintenance plan means a plan that— (i) is prepared by the owner or operator of one or more electrical transmission or distribution facilities to cover one or more electric transmission and distribution rights-of-way