- City of Nashua, Division of Public Works
- State & Local
- Nashua, New Hampshire
Project Overview
Charter built the Phase III expansion of the Four Hills Landfill for the City of Nashua, New Hampshire. The new cell was needed because the existing Phase II municipal disposal area was approaching capacity.
Charter cleared approximately seven acres of forested land, excavated the new cell to design subgrade and constructed a double-lined containment system to protect groundwater.
Charter’s Role
- Submittals, site-specific work plans, clearing and grubbing
- Excavation, perimeter berms, access roads and stormwater-management infrastructure
- A compacted clay subgrade and secondary liner of low-permeability soil, 60-mil HDPE and drainage geocomposite
- A primary liner of geosynthetic clay liner, 60-mil HDPE and drainage geocomposite, topped with a protective sand layer
- Primary and secondary leachate collection sumps with pump-access pipes
- A leachate-control building to monitor levels and load leachate for off-site disposal
Outcomes & Benefits
The expansion gave the City of Nashua much-needed new disposal capacity before the existing cell reached its limit, built with a double-lined containment system to protect groundwater.
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