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Cherry Island Landfill Expansion Cherry Island Landfill Expansion Site Contracting Excavating Services Crushed Stone Sand Gravel Road Highway Paving

Terra Structures
4/1/2007 - 6/22/2010
Project Type: State/Municipal/Federal
Client: Sevenson Environmental Services, Inc.
Owner: Delaware Solid Waste Authority
Services Include:

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MSE Structures

Additional Project Features:

  • 2 million C.Y. of Fill
  • Over 1 million S.Y. of Geogrid Reinforcement
  • In 2007, DSWA began an expansion project with the goal of extending the life of the Cherry Island Landfill (CIL) by creating additional airspace on top of the existing landfill footprint. Subsurface characteristics at the site consisted of very soft and extremely compressible materials which presented a design challenge. A foundation improvement technique using prefabricated vertical drains (PVDs) combined with a Mechanically Stabilized Earth (MSE) berm was designed to overcome the stability issues and accommodate large expected settlements of the MSE berm - up to 14 feet. In April 2007, Terra Structures began construction of the 475,000 SF MSE berm. The berm is 60 feet high, almost 2 miles in length, consists of 2 million C.Y. of fill and over 1 million S.Y. of geogrid reinforcement. When completed, it will be one of the highest and most massive reinforced structures constructed over soft soils built in the U.S. and will provide 19 years of additional disposal life at the CIL facility.

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