Offpost Intercept and Treatment System (North Plume Group)

Construction of this facility (located beyond the Arsenal's northern boundary at Peoria Street and 96th Avenue) began in November 1991. Full-scale operations began in June 1993.

The major components of this action are the removal of contaminated groundwater north of the RMA boundary, followed by treatment of the extracted groundwater, and finally recharging the treated groundwater using a series of reinjection wells.

The reinjected groundwater meets or exceeds applicable state and federal standards for groundwater. The Offpost Record of Decision, which was finalized December 19, 1995, determined that this facility would be improved and monitored as needed.