; 137 Stat. 38); (B) describe the existing categorical exclusions most frequently used by the Secretary to streamline the environmental review of project studies; (C) consider— (i) whether the adoption of additional categorical exclusions, including those used by other Federal agencies, would facilitate the environmental review of project studies; (ii) whether the adoption of new programmatic environmental impact statements would facilitate the environmental review of project studies; and (iii) whether agreements with other Federal agencies would facilitate a more efficient process for the environmental review of project studies; and (D) identify— (i) any discrepancies or conflicts, as applicable, between the amendments to the National Environmental Policy Act of 1969 ( 42 U.S.C. 4321 et seq. ) made by section 321 of the Fiscal Responsibility Act of 2023 ( Public Law 118–5 ; 137 Stat. 38) and— (I) section 2045 of the Water Resources Development Act of 2007 ( 33 U.S.C. 2348 ); and (II) section 1001 of the Water Resources Reform and Development Act of 2014 ( 33 U.S.C. 2282c ); and (ii) other issues, as applicable, relating to section 2045 of the Water Resources Development Act of 2007 ( 33 U.S.C. 2348 ) that are impeding the implementation of that section consistent with congressional intent. (g) Study on dredged material disposal site construction (1) In general The Comptroller General shall conduct a study that— (A) assesses the costs and limitations of the construction of various types of dredged material disposal sites, with a particular focus on aquatic confined placement structures in the Lower Columbia River; and (B) includes a comparison of— (i) the operation and maintenance needs and costs associated with the availability of aquatic confined placement structures