Prevent Off-Site Migration of Contaminated Groundwater
Albers, IL: Soil-Bentonite Slurry Wall, Monterey No. 2 Coal Mine
Geo-Con installed a slurry wall at the site of a former coal mine. The slurry wall was part of a larger remediation project to close the surface Refuse Disposal Areas (RDAs) of the mine. The slurry wall was designed to prevent mitigation of impacted groundwater off of the site.
The total slurry wall is approximately 180,000 square feet, with depths varying from 32 to 60 feet. The total length of wall is approximately 1,400 feet with a key-in depth of 5 to 8 feet into the underlying clay and bedrock key. Geo-Con created backfill with trench spoils along with dry bentonite to achieve permeability in the range of 1x10-8 cm/sec.
Quality control on the project included sampling the slurry wall using a drill rig and piston sampler following installation.
Additional scope of Geo-Con's work included stripping and replacing topsoil, erosion controls, slurry wall cap with geo-synthetics, and re-establishing vegetation.