Fairfax County Parkway

Project Tasks and Responsiblities

3e is responsible for the natural resource studies, remedial and hazardous materials work plans, environmental permitting and environmental oversight for a 2.4 mile extension of Fairfax County parkway from the Franconia-Springfield Interchange to Interstate 95 through the Ft Belvoir EPG. This was the last segment of the Fairfax County parkway. The project is a $90 million dollar Design Build project that creates a new interchange and access for Ft Belvoir’s BRAC expansion, which is experiencing significant expansion because of BRAC related closure at other installations. This is federally funded project, with significant challenges including:

• Presence of 3 RCRA Corrective Action sites with significant environmental contamination from petroleum and Volatile Organic Compounds at Ft Belvoir EPG that the parkway crosses. 3e completed a complex MODFLOW model of the groundwater plumes and evaluated whether the construction would affect the migration of the plumes by intercepting contaminated groundwater or changing the rate or direction of plume migration. 3e also prepared a Health and Safety Plan and a Hazardous Materials Management Plan for managing contaminated soils and groundwater during the construction. These plans were reviewed by Ft Belvoir environmental staff. 3e also developed an Investigative Work Plan for assessing sites that had unknown contamination from UXO or other environmental releases.

• Presence of UXO at six sites throughout the EPG that were being crossed by the roadway. 3e had to be trained to recognize and manage UXO for the environmental oversight that we had to perform during construction.

3e’s responsibilities involved comprehensive environmental studies including a Phase II Environmental Site Assessment and groundwater modeling (using MODFLOW) and hazardous materials assessment of the entire corridor, the wetland and stream assessment and permitting for the impacts to wetlands and streams from the road, wetland and stream mitigation (1.5 acres of wetlands and 920 stream credits), and inspection services for environmental permit compliance.