Remediation and Redevelopment of an Urban Waterfront Area at a Former Manufactured Gas Plant (MGP)



 Remediation and Redevelopment of an Urban Waterfront Area at a Former Manufactured Gas Plant (MGP)

Presenter:  Peter Cox, PG (AECOM)
Authors: Peter Cox, PG and Shail Pandya (AECOM)


This former MGP is located in an urban area abutting a large saline waterbody. The former MGP is comprised of two parcels – a main parcel and a waterfront parcel owned by the City. Remediation of the two parcels was conducted separately. The main parcel was remediated prior to the waterfront parcel. The bulkhead adjoining the waterfront parcel was in need of replacement. In consultation with the City, remediation of the waterfront parcel was conducted following the replacement of the Bulkhead. The waterfront parcel site remediation included installation of a NAPL barrier wall, removal of soil, placement of cover systems, and passive NAPL recovery system.

Prior to remediation and redevelopment, the waterfront parcel was a vacant lot with an uneven surface made up of fill and debris and a decrepit bulkhead. This poster discusses the collaborative and coordinative activities between multiple stakeholders with different objectives to achieve the common goal –remediation and redevelopment/revitalization of the bulkhead area.

Three major phases required coordination, including (1) replacement of the bulkhead wall to achieve shore protection, meet Hurricane Sandy requirements, and ensure construction does not disturb or distribute impacted areas; (2) development, selection, and design of post remediation park renderings for the waterfront parcel; and (3) remediation construction including construction of a waterfront park.

The first phase, bulkhead replacement, required design and implementation coordination with the City and it’s bulkhead replacement contractor including review of the design for regulatory (remedial) compliance, facilitation of permitting efforts, review of construction documents for remedial compliance, and oversight of construction work. The coordination included meetings between multiple City agencies, the former MGP representatives, the bulkhead replacement contractor, and the remedial regulatory agency. Changes during construction included changes to the bulkhead wall (King Piles) and import of clean backfill. This phase took two years to complete.

The second phase, post remediation park rendering design, required collaboration between former MGP representatives, City agencies, the remedial regulatory agency, and the public to develop and select redevelopment scenarios. The redevelopment scenarios were complicated due to the plan to construct a ferry terminal on portion of the waterfront lot. The selected post remedial redevelopment included a handicap compliant park with a new ferry terminal. This phase required multiple meetings as well as public presentation between the stakeholders (City agencies, remedial regulatory agency, and elected officials). This phase took two years to complete and was performed in parallel with the bulkhead replacement phase.

The third phase, remediation and construction of a handicap compliant park; included extensive permitting efforts and constructability issues (presence of C&D debris). The resulting park is now a community asset that fits into the future development plans. The park is handicap compliant and includes multiple seating areas, multiple fishing areas, and a variety of trees and plants as well as a new ferry terminal.  Sustainable and cost saving efforts during construction included reuse of left over sheet piles from the main site remediation and reuse of backfill imported during bulkhead replacement work.

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