ENTACT completed construction of a 30-acre RCRA compliant cover system on a former municipal and industrial waste landfill. Site activities included excavation and placement of 15,000 cubic yards of VOC impacted soils; excavation, drying, and placement of 15,000 cubic yards of basin sediments; installation of 1,000,000 square ft of Geosynthetic Clay Liner (GCL), High Density Polyethylene (HDPE) and drainage composite; installation of a RCRA compliant cover system; management of 300,000 gallons of landfill leachate, installation of a gas vent system and upgraded leachate collection system; modification of the existing stormwater detention and discharge systems; and revegetation of the restored landfill cap.
Facility Landfill Closure Project
Borrow area preparation and excavation
Landfill regrading and geosynthetics installation
Installation of 21.2-acre, 2-foot soil cap with vegetative cover
Installation of access roadway and pavement, riprap ditches and gabions
Removal of sediments from sedimentation basin and construction of permanent detention basin structure
The scope of work on this project included clearing and grubbing; borrow area development; landfill re-grading; installation of geosynthetic liner systems; and construction of a 2-foot vegetative soil cover over 21.2 acres. Additional scope included construction of a paved access road with rip rap and gabion lined borrow ditches; removal of sediment from a retention basin; construction of a permanent detention basin structure; and site restoration.
Geosynthetic Clay Liner (GCL) – A geosynthetic clay liner is a layer of processed clay (typically bentonite) either bonded to a geomembrane of fixed between two sheets of geotextile. Overall GCL configuration, clay quality, clay quantity per unit area, and uniformity, are primary drivers of performance.
