; and (2) specifying the percentage of funds expended for each of the purposes specified in subsections (a), (b), and (c). 6. Prudent use of funds (a) Cost-Effective methods In selecting a method to be used to control or manage an invasive species as part of a specific control or management project, the Secretary concerned shall prioritize the use of the least-costly option, based on sound scientific data and other commonly used, cost-effective benchmarks, in an area to effectively control and manage invasive species. (b) Comparative economic assessment To achieve compliance with subsection (a), the Secretary concerned shall require a comparative economic assessment of invasive species control and management methods to be conducted. (c) Categorical exclusions (1) In general An invasive species control or management project or activity described in paragraph (2) is categorically excluded from the requirement to prepare an environmental assessment or an environmental impact statement under the National Environmental Policy Act of 1969 ( 42 U.S.C. 4321 et seq.) during the period for which the Secretary concerned determines that the project or activity is otherwise conducted in accordance with applicable agency procedures, including any land and resource management plan or land use plan applicable to the area. (2) Description of projects and activities A project or activity referred to in paragraph (1) is a project or activity that, as determined by the Secretary concerned— (A) is, or will be, carried out on land or water that is— (i) directly managed by the Secretary concerned; and (ii) located in a prioritized, high-risk area; and (B) involves the treatment of any land or waterway located within 1,000 feet of— (i) any port of entry to the United States, including— (I) a water body or waterway; (II) a railroad line; (III) an airport; and (IV) a roadside or highway; (ii) a water project; (iii) a utility or telephone infrastructure or right-of-way; (iv) a campground; (v) a National Heritage Area