7 WORLD TRADE CENTER
On 9/11 fiery debris from the collapse of the north and south World Trade Center towers crashed into the 7 World Trade Center office building, which burned and eventually collapsed. Con Edison had maintained electric substation equipment within that building serving the west side of lower Manhattan and according to NYSDEC records, a significant transformer oil spill occurred. NYSDEC ordered Con Edison, and a building tenant, to perform remedial investigations to determine the extent of impact. Langan was retained by Silverstein Properties, the owner of 7 World Trade Center, to oversee remediation of soil and groundwater impacts. Langan confirmed that underground diesel oil storage tanks, owned and operated by Silverstein Properties, were contained within an undamaged concrete vault and did not leak. Langan then oversaw removal of two unprotected and heavily damaged underground diesel oil tanks, owned and operated by a tenant. Langan is currently overseeing demolition and removal of all remaining subsurface foundation structures including substation cables, cable conduit, and transformer oil-contaminated soil to a depth up to 25 feet below the surface. Langan prepared a Contaminated Soil and Groundwater Management Plan, approved by NYSDEC, and plans and specifications to address soil and groundwater removal and disposal, health and safety protection for construction workers and the general public. Our oversight responsibilities include documentation of all activities, testing and evaluation of soil and groundwater quality, waste classification sampling and analysis, air monitoring and preparation of a final Closure Report.