ENTACT remediated an MGP site located in an urban area bordered by light industrial and commercial development, undeveloped land, and a shallow river. Historical releases of MGP residuals had impacted soil and groundwater, and contaminants migrating to the adjacent river’s bank affected an isolated sediment area.

The overall scope included the development of a treatability study; demolition of concrete footings and slabs; excavation and off-site disposal of 10,500 tons of impacted soil; installation of 180 linear feet of 36-inch reinforced concrete pipe, manhole and headwall; in-situ solidification and stabilization (ISS) through vertical auger mixing of approximately 30,000 cubic yards of impacted materials across the site; restoration of the site to natural grade with topsoil, native grasses and trees; and stabilization of the river bank through riprap placement.