Client Name: OENJ Cherokee Corporation, Bayonne, New Jersey

Edgeboro International Inc. was retained to construct a leachate collection system utilizing a Biopolymer trenching methodology and a pneumatic pumping system for OENJ Cherokee at the Bayonne Redevelop­ment Site, in Bayonne New Jersey.

Edgeboro redesigned the entire 13,000 lineal feet of leachate collection lines and pump stations incorporating the Biopolymer trenching methodology and a pneumatic pumping system in order to minimize potential prob­lems inherent in the original design;

• Stability of the existing cutoff wall during construction of the leachate collection system
• The need to dewater open trenches in order to install pipes
• Excessive volume of excavation and the need to construct work platforms
• Minimal slope of the gravity collection lines that would be future maintenance problems
• The ability of the containment system to provide an inward hydraulic gradient at the cutoff wall (i.e. leachate levels inside the cutoff wall lower than groundwater elevations outside the cutoff wall)

The construction of the leachate collection system using conventional construction methods would have been financially, technically and environmentally unfeasible due to the identified design flaws. Edgeboro proposed an alternative solution, which solved the client’s problems as well as saved the client a considerable amount of time and money.

Biopolymer Deep Trenching with a Pneumatic Pumping System

A Biopolymer slurry was used to support the walls of the 25’ deep trenches where the perforated HDPE pipe was installed to a specified grade, before the stone aggregate was installed. A pneumatic pumping system was incorporated into the collection network in order to complete the leachate collection design.

These particular construction methods also minimized the nuisance of decomposed waste odors, which can emanate from open trenches in landfills. Additionally, since the pipes were laid at the bottom of the excavation by the integrated construction equipment, the workers’ exposure to waste, leachate and landfill gas was minimized. Thus health and safety was less of an issue during pipe installation.