FORMER WOOD TREATING SITE CORRECTIVE MEASURES IMPLEMENTATION
Bentonite Slurry Wall Installation Around Impacted Area Prevents Groundwater Migration into Nearby Wetlands
ENTACT implemented corrective measures at a 52-acre former wood-treating facility that produced creosote-treated railroad crossties.
We installed a 2,200 linear foot soil-bentonite slurry wall to a depth of 45 feet below surface grade and permeability of 1×10-7 cm/sec to contain the source area and control groundwater migration from it. ENTACT also excavated and consolidated 17,000 cubic yards of polycyclic aromatic hydrocarbon and phenol-impacted surface soils, subsurface soils, and sediments and dewatered and backfilled a former water supply pond located in the slurry wall containment area. Finally, we constructed a 7.4-acre engineered capping system over the containment area consisting of clay and topsoil.
ENTACT completed the project by backfilling and revegetation of excavated areas, installing recovery wells to capture free product, and restoring a ditch and surrounding wetlands areas affected by the corrective action.