OBG’s Focus on Solutions
OBG led a design-build team to remediate PAHs and non-aqueous phase liquids (NAPL) in soil and sediment at the nearly two-acre waterfront site. The project included remedial design, permitting, agency negotiations, construction management, air monitoring, in-situ soil stabilization/solidification (ISS), bulkhead replacement, dry dock removal, sediment dredging, sediment capping, turbidity monitoring, and habitat restoration.
The ISS component of the upland soil remedy was integrated with the design of the permanent bulkhead as a result of value engineering by the team during bidding. The proposed ISS depth was increased along the bulkhead replacement to stabilize deep NAPL, reduce the potential for migration, and facilitate construction of the permanent bulkhead. The project applied green remediation techniques, maximizing habitat creation by integrating habitat restoration into the remedial plan. Restoration included design water depths aligned with fish habitat needs and the installation of sunken evergreen trees and timber cribs to provide refuge and fish forage habitat.