; and (B) by redesignating paragraphs (25) and (26) as paragraphs (24) and (25), respectively. (3) Study (A) In general The Secretary of the Interior shall conduct a study of stormwater impacts with respect to any area that the Secretary determines may be contaminated by stormwater runoff associated with oil or gas operations, which shall include— (i) an analysis of measurable contamination in such area; (ii) an analysis of ground water resources in such area; and (iii) an analysis of the susceptibility of aquifers in such area to contamination from stormwater runoff associated with such operations. (B) Report Not later than 1 year after the date of enactment of this section, the Secretary shall submit to Congress a report on the results of studies conducted under subparagraph (A). (c) Clean Air Act (1) Repeal of exemption for aggregation of emissions from oil and gas sources Section 112(n) of the Clean Air Act ( 42 U.S.C. 7412(n) ) is amended by striking paragraph (4). (2) Hydrogen sulfide as a hazardous air pollutant The Administrator of the Environmental Protection Agency shall— (A) not later than 180 days after the date of enactment of this Act, issue a final rule adding hydrogen sulfide to the list of hazardous air pollutants under section 112(b) of the Clean Air Act ( 42 U.S.C. 7412(b) )