Problem: The U.S. Environmental Protection Agency (EPA) remedy selection for a Superfund Site comprised of a shallow marine channel consists of engineered capping and natural recovery to address polychlorinated biphenyl (PCB) and lead contamination. The Engineering Evaluation/Cost Analysis (EE/CA) for the site recommended this alternative to address the contaminated sediments through a combination of dredging, capping, enhanced monitored natural attention/monitored natural attenuation (EMNR/MNR), and institutional controls. Sediments will be removed up to 2 feet in depth, and an engineered cap will be installed within the footprint of the removal areas. EMNR/MNR as well as institutional controls will be implemented where appropriate.

Solution: TIG Environmental was hired by a consortium of potentially responsible parties (PRPs) at the site to provide assistance throughout the Design and Remediation phases of the work. Pre-remedial design studies will address important considerations such as the siting of a sediment handling facility in close proximity to the nearby residential neighborhood. Additionally, there will be proof-of-concept studies for MNR/EMNR and engineered capping.

Value Provided: The technical, regulatory, and social setting of the site is complex. TIG Environmental is able to effectively balance the competing demands of the work while keeping the schedule moving forward. The high level of experience provided has been a reassurance to EPA and the community that their needs and concerns will be well considered.