; (2) iron, steel, and the relevant manufactured goods are not produced in the United States in sufficient and reasonably available quantities and of a satisfactory quality; or (3) inclusion of iron, steel, and manufactured goods produced in the United States will increase the cost of the overall project by more than 25 percent. (c) Publication of justification If the Secretary determines that it is necessary to waive the application of subsection (a) based on a finding under subsection (b), the Secretary shall publish in the Federal Register a detailed written justification of the determination. (d) Construction This section shall be applied in a manner consistent with United States obligations under international agreements. 307. Labor standards The grant programs under this Act are applicable programs (as that term is defined in section 400 of the General Education Provisions Act ( 20 U.S.C. 1221 )) subject to section 439 of such Act ( 20 U.S.C. 1232b ). 308. Charter schools A local educational agency receiving an allocation under this section shall use an equitable portion of that allocation for allowable activities benefitting charter schools within its jurisdiction, as determined based on the percentage of students from low-income families in the schools of the agency who are enrolled in charter schools and on the needs of those schools as determined by the agency. 309. Green schools (a) In general In a given fiscal year, a local educational agency shall use not less than the applicable percentage (described in subsection (b)) of funds received under this Act for public school modernization, renovation, repairs, or construction that are certified, verified, or consistent with any applicable provisions of— (1) the LEED Green Building Rating System; (2) Energy Star; (3) the CHPS Criteria; (4) Green Globes