; up to $50,000,000 may be used for staff quarters; up to $50,000,000 is for equipment; and no more than $200,000,000 is available to reduce the Backlog of Essential Maintenance, Alteration and Repair: Provided , That none of the funds provided under this heading shall be obligated until the Indian Health Service has provided a detailed spend plan, including identifying each specific project by Tribe, the estimated project cost, and the expected project completion, to the Committees on Appropriations of the House of Representatives and the Senate at least 30 days prior to distributing any funds: Provided further , That the Indian Health Service shall provide a quarterly project report to such committees: Provided further , That notwithstanding any other provision of law, funds appropriated for the planning, design, construction, renovation or expansion of health facilities for the benefit of an Indian Tribe or Tribes may be used to purchase land on which such facilities will be located: Provided further , That such amount is designated by the Congress as being for an emergency requirement pursuant to section 251(b)(2)(A)(i) of the Balanced Budget and Emergency Deficit Control Act of 1985. 501. None of the funds made available by this Act may be used to withdraw— (1) the preliminary regulatory determination to regulate perfluorooctanesulfonic acid (PFOS) and perfluorooctanoic acid (PFOA) under section 1412(b) of the Safe Drinking Water Act ( 42 U.S.C. 300g–1(b) ) that is described in the document entitled Announcement of Preliminary Regulatory Determinations for Contaminants on the Fourth Drinking Water Contaminant Candidate List published by the Environmental Protection Agency in the Federal Register on March 10, 2020 (85 Fed. Reg. 14098)