Settlement Evaluation for Cap Closure Performance

by Edward M. Zamiskie, Converse Consultants East, Parsippany, United States,
M. Golam Kabir, Converse Consultants East, Parsippany, United States,
Andre Haddad, Converse Consultants East, Parsippany, United States,

Document Type: Proceeding Paper

Part of: Vertical and Horizontal Deformations of Foundations and Embankments


Predicting short and long-term performance of a landfill cap system is a difficult task considering the generally unknown nature of the waste and magnitude and variation of settlement that may occur. A case study is presented for the evaluation of the performance of proposed landfill cap alternatives for a CERCLA (Superfund) landfill in Syosset, New York. The capping investigation, which addressed concerns of both the USEPA and NYSDEC (New York State Department of Environmental Conservation), included a site-specific field investigation to gather data on in situ properties of the solid waste. On the basis of these data, a settlement analysis of the solid waste was performed and the performance of landfill cap alternatives were evaluated. Geotechnical field investigation techniques more commonly used to assess soil properties were employed on the solid waste. These included standard exploratory borings, pressuremeter testing, and fill load tests using settlement plates. This landfill settlement study was the basis for recommendations regarding overall site grading and drainage, pre-capping stabilization alternatives, modifications or reinforcement of the cap design section, and a post-remediation cap performance monitoring program.

Subject Headings: Landfills | Load tests | Soil settlement | Soil stabilization | Field tests | Solid wastes | Load factors | New York | United States

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