Pigeon Point Landfill, Wilmington, DE


Duffield has provided engineering services for various types of projects (and for various clients), related to the landfill located at Pigeon Point for over 20 years. Duffield’s engineers provided geotechnical analysis of the landfill, which was originally constructed by New Castle County in the 1970’s and continuing after the Delaware Solid Waste Authority (DSWA) took over operation of the landfill in the early 1980’s. Services included evaluating the impacts of constructing the landfill over very soft marsh deposits present at this site, cover surveys and environmental monitoring.

In 1985, when DSWA contracted with the Crouse Corporation of Delaware (CCD) to build an Energy Generating Facility (EGF) at Pigeon Point, CCD retained Duffield to provide geotechnical, structural, civil, environmental and construction engineering services for construction of the facility. The EGF structure, because of the extremely soft soil conditions, was constructed on a combination of both shallow and deep (pile) foundations.  Duffield was also responsible for the design of the strip drain system, the embankments, sheet pile retaining systems (used to create the grade separations), and shallow and pile foundations for the structures and equipment, as well as reviewing the construction of these elements.

In a later development of the site, Duffield was retained by the City of Wilmington to assist with the design and placement of stabilized sludge to recap the landfill and promote improved surface drainage. Placement of these materials also served to stabilize the top and was a major consideration in the later attempt by the Port of Wilmington to attract Toyota to build on the landfill.

pigeon point