; (2) the Environmental Protection Agency; and (3) other Federal departments and agencies, as the Secretary determines to be necessary. (j) Design guide The Secretary shall encourage the National Renewable Energy Laboratory to develop a new design guide for schools that takes into account best practices and lessons learned from the implementation of the grant program established under subsection (b). (k) Labor standards (1) Labor and Buy American provisions (A) In general Each contractor or subcontractor for a project funded by a grant under this section shall carry out the following: (i) Ensure that the materials used by the contractor or subcontractor are substantially manufactured, mined, and produced in the United States in accordance with chapter 83 of title 41, United States Code (commonly known as the Buy American Act ). (ii) Ensure that all laborers and mechanics employed by the contractor or subcontractor in the performance of construction, alteration, repair, or maintenance work financed in whole or in part with assistance under this section shall be paid wages at rates not less than those prevailing on similar construction in the locality, as determined by the Secretary of Labor, in accordance with subchapter IV of chapter 31 of title 40, United States Code (commonly known as the Davis-Bacon Act ). With respect to the labor standards in this clause, the Secretary of Labor shall have the authority and functions set forth in Reorganization Plan Numbered 14 of 1950 (64 Stat. 1267