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Wood Treatment Site
Summary
This 100 acre former wood treating site is located in Nashua NH along the Merrimack River. The site is being addressed via a consent decree between the owner and the New Hampshire Department of Environmental Services. The past history of pressure treating of various wood products, such as rail ties and utility poles with creosote, have resulted in the presence of Dense Non Aqueous Phase Liquids (DNAPL) in the subsurface. KEY and its affiliate FTS have been involved in the investigation and remediation of the site. Remediation challenges at the site were further complicated by varied geologic conditions, bordering along a navigable river used for recreation, and being adjacent to a city owned park. Remediation planning took into consideration redevelopment of the site.
Techniques
Investigation:
Tar Specific Green Optical Screening Tool (TarGOST)
Extensive terrace deposit and bedrock investigations soil and groundwater investigations
River sediment investigations
Environmental Visualization Software (EVS )
DNAPL recover evaluations
Permitting:
NHDES- wetlands, shoreland, alteration of terrain and groundwater injection
USACOE – Wetland
City
Community relations
Remediation:
Well abandonment
DNAPL Recovery
Cement bentonite barrier wall
River sediment excavation
River restoration using reactive core mat and capillary break
In-situ chemical stabilization
On-site consolidation and capping of impacted soils
Air monitoring
Operation and Maintenance (FTS)
Daily operation of remediation components
Triannual groundwater monitoring and reporting
Waste management