Remedial Action Work Site
Osborne Landfill Site
Grove City, Pennsylvania

Geo-Con successfully completed a two-year, $5 million remedial action project at the Osborne Landfill Superfund Site. The twenty-eight acre site contained a fifteen-acre abandoned coal seam strip mine that had been used as a landfill for primarily foundry sand. The onsite closure objectives were to prevent contact with the contaminants by the public, contain migration of contaminants from the fill area to the groundwater. Contaminants of concern (COC) included heavy metals (chromium, cadmium, lead, nickel, beryllium), PCBs, VOCs, and chlorinated solvents (vinyl chloride, trichloroethene).

Major elements of the remedial action included the following:

• 2-acres of wetland construction to replace approximately 1-acre of wetlands eliminated by construction activities.

• 180,000 cubic yards of earthwork that included waste relocation and cover, stream diversion, and back filling of two leachate ponds.

• Grouting of deep mine voids to facilitate construction of a soil-bentonite slurry wall.

• Construction of a first of its kind soil-bentonite slurry wall through grouted mine voids to contain groundwater within the former strip mine pit.

• Installation of extraction and injection well systems to maintain water levels within the area contained by the slurry wall.

• Construction of a multi-layer low permeability 18-acre cap system which included GCL, geocomposite and geotextile.

• Vegetation and site restoration of the site.