020-26 Wyo. Code R. § 26-9
Where a well penetrates more than one aquifer or water bearing strata, every aquifer and/or strata shall be sealed off to prevent migration of water from one aquifer or strata to another.
(a) Strata shall be sealed off by placing impervious material opposite the strata and opposite the confining formation(s). The seal shall extend above and below the strata no less than ten (10) feet. The sealing material shall fill the annular space in the interval to be sealed, and the surrounding void spaces that might absorb the sealing material. The sealing material shall be placed from the bottom to the top of the interval to be sealed.
(b) Commercial, municipal and industrial waste and artificial recharge wells shall be sealed/ cemented in order that all aquifers are isolated over the entire length of casing(s) and shall be surrounded by a minimum of two (2) inches of sealant. The sealant/cement plug used to isolate the aquifer(s) shall extend fifty (50) feet above and below the interface between confining layer and the aquifer(s).
(c) Sealing material shall consist of neat cement, cement grout, or bentonite clay as per Section 6(c).
020-26 Wyo. Code R. § 26-9
Amended, Eff. 6/29/2018.