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Case Study

Innovative remediation of former waterfront manufactured gas plant site

Every Challenge Has a Backstory

Central Hudson Gas & Electric Co. set out to complete a $20 million cleanup effort to remove coal tar and polycyclic aromatic hydrocarbons (PAHs)  in soil, groundwater, and sediment at its former manufactured gas plant (MGP) site in Kingston, New York. To accomplish this, Central Hudson retained OBG under a design-build contract to remediate the site. 

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. 

Results that Matter

OBG safely and cost-effectively addressed upland and sediment remediation, including dredging 25,500 cubic yards of impacted sediment and performing 20,600 cubic yards of ISS. In support of regulatory goals, OBG provided for restoration of Rondout Creek, incorporating measures to maximize wildlife habitat while protecting energy infrastructure. Using a cooperative design-build approach, OBG delivered a project that was completed on schedule and at a significantly lower cost than what was originally estimated in the site’s feasibility study.