Invited Session: Smart Technologies
Using Monitoring Data to Design a Sustainable Landfill Expansion (0.5 CEU)
Wednesday, September 27, 2017
9:00 – 9:30
Moderator: Allison Trulock, Executive Consultant, Environmental Practice, NewGen Strategies & Solutions, LLC, Florida
Cherry Island Landfill (CIL) has been in operation since 1985 by the Delaware Solid Waste Authority (DSWA). DSWA had “NO TIME TO WASTE” as the CIL was approaching permitted capacity and a vertical expansion using conventional techniques was economically unfeasible, permitting a new landfill site was initially considered. In 2006, the construction of an 8,000-ft long, 70-ft high mechanically stabilized earth (MSE) berm began. The MSE berm was constructed over soft deposits that exhibited shear strengths as low as 200 psf. The expansion project was demonstrated to be economically viable through the implementation of an innovative, cutting-edge design and construction approach. This project was a finalist of the Outstanding Civil Engineering Award, an international competition organized by the American Society of Civil Engineers. This is the first time that a solid waste project had ever been selected as a finalist of this prestigious award. In addition, this project was selected to be the only representative from the U.S. in the International Society for Soil Mechanics and Geotechnical Engineering “Outstanding Geotechnical project” award competition.
This presentation will discuss the successful design and construction of this massive earth structure over extremely soft dredge material using innovative design and construction techniques. It will examine the possibilities for designing the reuse of existing landfill facilities, delaying siting of a new landfill and will compare opportunities for raising levees and dykes cost effectively at critical locations along rivers that are prone to flooding. Although construction and operation over extremely soft foundations requires extensive monitoring, the potential drawbacks pale in comparison with the significant advantages. This project is expected to serve as a bellwether for similar projects.