core trench
Excavation of a trench in the foundation material under an earth embankment or dam in which special material is placed to reduce permeability.
Authorization Path: 2.4.5.2.20.15
Excavation of a trench in the foundation material under an earth embankment or dam in which special material is placed to reduce permeability.
Authorization Path: 2.4.5.2.20.15