Comprehensive remediation project management services

Project challenge:

WCD was hired to project manage the remediation of this former manufactured gas plant (MGP), which had significant technical challenges, including depth of excavation, odor control, and its proximity to residential and pre-school developments.


Client:

Advance Realty Group

Value:

$20Million

Solution:

WCD provided environmental consulting, regulatory interface, comprehensive remediation project management, and LSRP services at this urban redevelopment site.  The Site was a former Hoboken Gas Works MGP (manufactured gas plant) circa 1871 to 1946, and included subsequent use as a gas station. PSE&G, successor to Hoboken Gas Works, provided funding in addition to private development funding for the extensive remediation phase of the project. The remediation of this site had significant technical challenges relating to the depth of excavation, odor control due to the nature of the site contaminates (e.g., coal tar) and its very close proximity to dense residential and pre-school. developments.  Planned redevelopment included a mixed-use residential/commercial building with four stories of sub-grade parking.

These challenges were addressed through a unique “top-down” construction methodology which included the installation of a secant wall completely enclosing the Site. This was accomplished by drilling to bedrock and installing 307 perimeter concrete piles with reinforcing steel to simultaneously provide structural support for the building, support of excavation for the contaminated soil removal, and cutoff of the surrounding impacted groundwater.  Following installation of the secant wall, the first floor structural slab of the parking deck (P-1) was poured to “load” the secant piles, and excavation of contaminated soil was initiated from “top-down” to the second level, where the same process was repeated. The remediation subcontractor then removed and remediated in excess of 65,000 cy of impacted material from the site.  High capacity air handlers with carbon filtration of exhaust were used to ventilate the workspace and control odors emanating from the site.

Remediation work was recently completed and the Site is now in a vertical development phase.