{"data":{"id":"us/40-cfr-147.2554","jurisdiction":"us","citation":"40 CFR 147.2554","heading":"Aquifer exemptions.","body":"In accordance with §§ 144.7(b) and 146.4 of this chapter, those portions of aquifers currently being used for injection in connection with Class II (oil and gas) injection operations on the Wind River Reservation, which are described below, are hereby exempted for the purpose of Class II injection activity. This exemption applies only to the aquifers tabulated below, and includes those portions of the aquifers defined on the surface by an outer boundary of those quarter-quarter sections dissected by a line drawn parallel to, but one-quarter mile outside, the field boundary, and is restricted to extend no further than one-quarter mile outside the Reservation boundary. Maps showing the exact boundaries of the field may be consulted at the EPA's Region 8 Office, and at the EPA Headquarters in Washington, DC.\nAreas To Be Exempted for the Purpose of Class II Injection on the Wind River Reservation\nFormation Approximate depth Location\nSteamboat Butte Field\nPhosphoria 6,500-7,100 T3N, R1W—W/2 Sec. 4, Sec. 5, E/2 Sec. 6, NE/4 Sec. 8, W/2 Sec. 9. T4N, R1W—W/2 Sec. 29, E/2 Sec. 30, E/2 Sec. 31, Sec. 32.\nTensleep 6,900-7,500 T3N, R1W—W/2 Sec. 4, Sec. 5, E/2 Sec. 6, NE/4 Sec. 8, W/2 Sec. 9. T4N, R1W—W/2 Sec. 29, E/2 Sec. 30, E/2 Sec. 31, Sec. 32.\nWinkleman Dome Field\nTensleep 2,800-3,300 T2N, R1W—SW/4 Sec. 17, Sections 18, 19, 20, 29, NE/4 Sec. 30. T2N, R2W—E/2 Sec. 13, NE/4 Sec. 24.\nPhosphoria 2,800-3,600 T2N, R1W—SW/4 Sec. 17, Sections 18, 19, 20, 29, NE/4 Sec. 30. T2N, R2W—E/2 Sec. 13, NE/4 Sec. 24.\nNugget 1,100-1,500 T2N, R1W—SW/4 Sec. 17, Sections 18, 19, 20, 29, NE/4 Sec. 30. T2N, R2W—E/2 Sec. 13, NE/4 Sec. 24.\nLander Field\nPhosphoria 1,100-3,800 T2S, R1E—Sections 12 and 13, E/2 Sec. 24, NE/4 Sec. 25. T2S, R2E—W/2 Sec. 18, W/2 Sec. 19, Sec. 30. T33N, R99W—Sec. 4.\nNW Sheldon Field\nCrow Mountain and Cloverly 3,400-3,600 T6N, R3W—SE/4 Sec. 35, SW/4 Sec. 36. T5N, R3W—N/2 Sec. 1.\nCircle Ridge Field\nTensleep 1,500-1,800 T6N, R2W—Sec. 6, N/2 Sec. 7. T7N, R3W—SE/4 Sec. 36. T7N, R2W—SW/4 Sec. 31. T6N, R3W—E/2 Sec. 1.\nPhosphoria 800-1,800 T7N, R3W—S/2 Sec. 36. T6N, R3W—NE/4 Sec. 1.\nAmsden 700-l,200 T6N, R3W—Sec. 6.\nRolff Lake Field\nCrow Mountain 3,500-3,700 T6N, R3W—SW/4 Sec. 26, NW/4 Sec. 27.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER D—WATER PROGRAMS","PART 147—STATE, TRIBAL, AND EPA-ADMINISTERED UNDERGROUND INJECTION CONTROL PROGRAMS","Subpart ZZ—Wyoming"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"a1bd0e7306f6822a8c3e9c55430c87f844a1494201eaf3b0e8e3f715f9da94cb","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-147.2553","next":"us/40-cfr-147.2555"},"notice":"GroundRules: Original legal text. Not legal advice."}