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Environmental and Geotechnical Construction Services
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Sediment Remediation - Midwest

  • Multi-year, phased removal of PCB-impacted sediments within a flash flood tributary basin of a river
  • Installation of 50,000 GPM and 9,000 GPM bypass pumping systems to reroute water flow
  • Segregation, stockpiling, and management of PCB-impacted floodplain soils and sediment
  • Installation of 550 LF cut-off wall using fiber reinforced plastic sheet (FRP) with cement bentonite grout injection
  • 3,000 LF of ditch line and 5,600 LF of creek channel remediated; 178,500 tons transported for offsite disposal

ENTACT completed multi-year, phased removal of PCB impacted sediments located within a flash flood tributary basin of a river. General site activities included site preparation; installation of 50,000 GPM and 9,000 GPM bypass pumping systems to reroute water flow around the work areas; directional boring of a new sewer discharge line under the ditch and existing rail line to the existing POTW sewer system; treatment and discharging of water to the creek or treatment plant; segregation, stockpiling, and management of PCB impacted floodplain soils and sediment, including those containing free product, prior to load-out and off-site disposal; removal and segregation of PCB impacted sediment, clay, and other native material from an outfall channel; installation of 550 LF cut-off wall using fiber reinforced plastic sheet (FRP) with cement bentonite grout injection; vacuum excavation of multiple fiber optic utilities along an active rail line; and site restoration activities.  A total of 3,000 LF of ditch line and 5,600 LF of creek channel were remediated, 178,500 tons were transported off-site for disposal, and 4 billion gallons of water were treated. Management and protection of work spaces in anticipation of flash flood events were critical to the success of the project.