National Grid Fulton NAPL Barrier Wall

Brooklyn, NY

National Grid

Project Dates:
2019 to 2021

  • Site Drainage and Sewer Contracting
  • Steel Sheet Piling
  • Steel Sheeting and Bulk Heading
  • Stone, Sand, Clean Fill
  • Thermal Disorbtion and Recycling of Petroleum Contaminated Soils
  • Thorough on-site Sampling; Testing and Analysis of Soils
  • Tie-backs
  • Transportation and Disposal of Contaminated Soils
  • Underpinning
  • Drilled Caissons
  • Earth Retention Systems
  • Marine Bulkheads
  • Remediation
  • Sanitary and Water Service Installations


The scope of this project involved the installation of new sheet pile bulkhead along the Gowanus Canal utilizing a non-vibratory press-in method for installation. This included site demolition of existing bulkhead and concrete slabs as well as excavation and disposal of contaminated soils. Posillico mobilized a large drill rig and jack-up barge to perform predrilling of sheet pile alignment to remove any obstructions, and then backfilled with sand up to the bulkhead tip elevation. The Giken Silent Piler was selected as the most capable press-in equipment. The project also involved the installation of micropiles, tiebacks and a waler system. Posillico extended the existent CSO pipe, provided building underpinning and installed a 20 ft noise barrier wall.


The location of the worksite and existing site conditions made this project complex. There was limited land access to the work area and the site was near occupied commercial buildings, including a movie studio and a special effects studio. The work performed caused noise nuisance and structural movement of existent buildings. In addition, the project required diligent coordination of marine traffic and deliveries due to other construction projects taking place simultaneously along the canal. Lastly, the project continued without interruption through the outbreak of the Covid-19 pandemic and the challenges it brought on.


The noise nuisance generated by the ongoing construction work was addressed by installing a noise dampening curtain. The structural issues of the adjacent buildings were addressed by underpinning the existent building foundations and developing alternate, less invasive, means of performing the contract work. Posillico coordinated with the other contractors working along the canal as well as with the NYCDOT to open bridges for deliveries. Lastly and importantly, Posillico implemented strict health and safety policies, assigned a full-time site safety officer, provided the crew with additional PPE, ensured daily cleaning procedures of the site facility, and led daily huddles and toolbox talks.