SYMPOSIA PAPER Published: 01 January 1999

Instrumentation of Dredge Spoil for Landfill Construction


The Delaware Solid Waste Authority's Northern Solid Waste Management Center is located outside of Wilmington Delaware at Cherry Island, a former dredge disposal site. Dredge spoils, of very low permeability, range in depths up to 30 m (100 feet) which form a natural “liner” and the foundation for the 140 ha (350-acre) municipal solid waste landfill. The soils beneath the landfill have been extensively instrumented to measure pore pressure, settlement and deflections, using inclinometer casings, standpipe piezometers, vibrating wire piezometers, pneumatic piezometers, settlement plates, liquid settlement gages, total pressure cells and thermistors. The nature of the existing waste and anticipated settlements (up to 6 m (19 feet)) have required some unique installation details. The instrumentation data has been integral in planning the landfilling sequence to maintain perimeter slope stability and has provided key geotechnical parameters needed for operation and construction of the landfill. The performance of the instrumentation and monitoring results are discussed.

Author Information

Byle, MJ
Gannett Fleming, Inc., King of Prussia, PA
McCullough, ML
Gannett Fleming, Inc., King of Prussia, PA
Alexander, R
Delaware Solid Waste Authority, Dover, DE
Vasuki, NC
Delaware Solid Waste Authority, Dover, DE
Langer, JA
Gannett Fleming, Inc., Camp Hill, PA
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Developed by Committee: D18
Pages: 175–190
DOI: 10.1520/STP14221S
ISBN-EB: 978-0-8031-5405-6
ISBN-13: 978-0-8031-2604-6