Cherry Island Landfill Expansion
| Location | Wilmington, Delaware |
| Contract Value | $90,000,000 |
| Period of Performance | September 2006 – September 2012 |
| Role | Prime Contractor |
History & Location
The Cherry Island Landfill (CIL), in Wilmington, Delaware underwent an expansion to provide an additional 19 years of disposal life. The landfill is located at the confluence of two rivers, creating very challenging subsurface conditions. The existing landfill was initially constructed in 1985 atop an area that was partially reclaimed from the Delaware River, and was used for many years as a dredged material disposal site for the U.S. Army Corps of Engineers. As a result, the subsurface characteristics at the CIL site consist of very soft and extremely compressible materials. Previous stability analysis indicated that the capacity of the landfill for vertical expansion was limited and, based on the incoming waste stream, the site would reach its capacity in 2006. The client’s goal was to develop a cost-effective design that could overcome the stability issues associated with the subsurface materials and allow a major facility expansion. In addition, the 513 acre landfill remained operational during the vertical expansion of the landfill footprint.
Significant Project Features
- Construct the earth and geosynthetics components of a 472,000 SF Mechanically Stabilized Earth Perimeter Berm on soft soils
- Over 2,000,000 cubic yards of engineered fill required to construct berm
- Installation of over 81,000 prefabricated vertical drains. Materials totaled 6,800,000 lf
- Installation of groundwater and landfill gas monitoring wells, and geotechnical and environmental monitoring systems to measure ground settlement during and after construction
- Construction of temporary and permanent components of leachate and landfill gas management systems. Installation of temporary and permanent mechanical and electrical systems
- Install 30+ acres of vapor barrier, geosynthetics clay layer, 60 mil geomembrane and geocomposite components of a liner system
- Material volume exceeded 1,300,000 SF
- Directional drilling at lengths over 150 lf and angles of repose greater than 35 degrees
- Leachate divers were required during installation of the leachate transmission system
- Strict compliance with DNREC regulations throughout the six (6) years of construction
Project Gallery
Rooted in Remedial Construction
Expanded into Environmental Dredging
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