; (2) iron, steel, the relevant manufactured goods, and the relevant commodity construction materials are not produced in the United States in sufficient and reasonably available quantities and of a satisfactory quality; or (3) inclusion of iron, steel, manufactured goods, and commodity construction materials produced in the United States will increase the cost of the overall project by more than 25 percent. (c) Written justification If the head of the Federal department or agency determines that it is necessary to waive the application of subsection (a) based on a finding under subsection (b), the head of the department or agency shall publish in the Federal Register a detailed written justification as to why the provision is being waived. (d) Consistency with international agreements This section shall be applied in a manner consistent with United States obligations under international agreements. (e) Limitation Nothing in this Act imposes, creates, or alters any requirement for a program that is not a deficient program. 4. Rulemaking Not later than 180 days after the date of enactment of this Act, the Secretary of Transportation shall issue regulations for purposes of this Act that define the term all manufacturing processes for manufactured products and commodity construction materials that are used in public works and infrastructure projects.