OAR 340-104-0029: Unsaturated Zone Monitoring Program

An owner or operator may be required to establish an unsaturated zone monitoring program consisting of soil-pore liquid monitoring in the zone immediately below a facility to determine whether hazardous constituents have migrated out of the facility. The Department will approve the components of this program based on a consideration of the construction and operation of the facility and the type and amount of waste being managed therein.