; and (II) not later than 30 days after the end of any hydraulic fracturing operations, the list of chemicals used in each underground injection during such operations, including identification of the chemical constituents of mixtures, Chemical Abstracts Service numbers for each chemical and constituent, material safety data sheets when available, and the volume of each chemical used. (ii) The State or the Administrator, as applicable, shall make the disclosure of chemical constituents referred to in clause (i) available to the public, including by posting the information on an appropriate internet website. (iii) Whenever the State or the Administrator, or a treating physician or nurse, determines that a medical emergency exists and the proprietary chemical formula of a chemical used in hydraulic fracturing operations is necessary for medical treatment, the person conducting the hydraulic fracturing operations shall, upon request, immediately disclose the proprietary chemical formulas or the specific chemical identity of a trade secret chemical to the State, the Administrator, or the treating physician or nurse, regardless of whether a written statement of need or a confidentiality agreement has been provided. The person conducting the hydraulic fracturing operations may require a written statement of need and a confidentiality agreement as soon thereafter as circumstances permit. (B) Subparagraphs (A)(i) and (A)(ii) do not authorize the State (or the Administrator) to require the public disclosure of proprietary chemical formulas. . (b) Clean Water Act (1) Limitation on permit requirement Section 402(l) of the Federal Water Pollution Control Act ( 33 U.S.C. 1342 ) is amended by striking paragraph (2) and redesignating paragraph (3) as paragraph (2). (2) Definitions Section 502 of the Federal Water Pollution Control Act ( 33 U.S.C. 1362 ) is amended— (A) by striking paragraph (24)