40 CFR 147.2554 -

Regulations last checked for updates: Feb 12, 2026

Title 40 - Protection of Environment last revised: Dec 22, 2026

View all text of Subpart ZZ [§ 147.2550 - § 147.2555]

§ 147.2554 -

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.

Areas To Be Exempted for the Purpose of Class II Injection on the Wind River Reservation

Formation	Approximate depth	Location
Steamboat Butte Field
Phosphoria	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.
Tensleep	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.
Winkleman Dome Field
Tensleep	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.
Phosphoria	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.
Nugget	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.
Lander Field
Phosphoria	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.
NW Sheldon Field
Crow Mountain and Cloverly	3,400-3,600	T6N, R3W—SE/4 Sec. 35, SW/4 Sec. 36. T5N, R3W—N/2 Sec. 1.
Circle Ridge Field
Tensleep	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.
Phosphoria	800-1,800	T7N, R3W—S/2 Sec. 36. T6N, R3W—NE/4 Sec. 1.
Amsden	700-l,200	T6N, R3W—Sec. 6.
Rolff Lake Field
Crow Mountain	3,500-3,700	T6N, R3W—SW/4 Sec. 26, NW/4 Sec. 27.

[53 FR 43092, Oct. 25, 1988]

authority: 42 U.S.C. 300f

source: 49 FR 20197, May 11, 1984, unless otherwise noted.

cite as: 40 CFR 147.2554