Project: Urban Park
Uplands Cleanup & Sediments Rl/FS
Urban Park
CRETE principals assisted in completing remediation and restoration of an urban park and preparing an RI/FS for the offshore sediments. The 25-acre public park was created in the mid-1970s and retained many of the former industrial structures as park features. The upland remedy was constructed in 2001 and was operated, maintained, and monitored through 2006. The upland remedy included tar removal, soil capping, an air sparging system along portions of the shoreline to remove benzene from shallow groundwater that discharges to the lake, and upland and shoreline habitat restoration.
A draft RI/FS was submitted for the cleanup and restoration of sediments and the adjacent shoreline area. Historical MGP, shipyard, and other industrial operations impacted the sediments with elevated levels of cPAHs, metals, and other contaminants. CRETE principals helped develop sediment cap designs that are resistant to frequent boat wake erosion and also offer aesthetic and environmental habitat value. Cap design has included fate and transport modeling of PAHs through sediment to determine necessary cap thickness. Shoreline remedies are being designed that will maintain park usage. A detailed geotechnical evaluation of the very soft site sediments was performed to determine the feasibility of capping the sediments and subaqueous slope stability of the relatively steep banks that flank the uplands site to determine cap and slope stability under both static and seismic conditions.
Work Performed
- Regulatory negotiations - MTCA
- Permitting - design commission, historic landmarks
- Shoreline site cleanup and development integration
- Construction management
- Insurance cost recovery
- Sediment RI/FS
- Geotechnical analysis of sediments
- Sediment cap design
Value Added
- Negotiated remediation levels based on groundwater to surface water attenuation factors
- Completed cleanup of the park during the winter and successfully reopened park for July 4th celebration
- Incorporated design features, such as the use of corten steel, to satisfy the Design Commission and the Historic Landmarks Board
- Successfully demonstrated the ability to cap very soft sediments