Website Update – November 30, 2023

National Grid’s contractor, Posillico Environmental, Inc. (Posillico), is implementing interim remedial measure (IRM) activities at the K-Equity Works former Manufactured Gas Plant (MGP) Site to address MGP Site related impacts in accordance with the New York State Department of Environmental Conservation (NYSDEC) approved design. The IRM activities are being performed at 222 Maspeth Avenue, Brooklyn, NY, with a support area across the street at 287 Maspeth Avenue. Mobilization began on June 26, 2023, with full time work activities starting on July 31, 2023. Community air monitoring and vibration monitoring are being conducted during this project.

Overview:

  • The key elements of the remediation work include:
    • Underpinning of certain site structures,
    • Removal of surficial concrete;
    • Shallow excavation;
    • In-situ soil stabilization / solidification;
    • Deep excavation under a temporary tent structure; and
    • Site restoration.
  • There are established measures to reduce potential noise, vibration, and dust from the work.
  • Air, noise, and vibration monitoring are being conducted each day to ensure that the work is conducted in accordance with the requirements of NYSDEC, New York State Department of Health (NYSDOH) and New York City (NYC). 

On-going activities:

  • Import (trucking) of reagents to support in-situ soil stabilization / solidification at 222 Maspeth Avenue.
  • Construction of a subsurface cement/slag/bentonite wall around the outside of the former MGP holder in support of in-situ soil stabilization / solidification activities at 222 Maspeth Avenue.
  • On-site soil management of excavated soil and debris in preparation for trucking loadout and off-site disposal.
  • Air, noise, and vibration monitoring.

Recently completed activities:

  • Activities are ongoing.

Upcoming work activities:

  • Soil excavation, work platform construction, and mobilization of mixing rig in support of In-situ soil stabilization / solidification at 222 Maspeth Avenue.
  • Transportation (trucking) and offsite removal of excavated soil and misc. materials at 222 Maspeth Avenue.
  • In-situ soil stabilization / solidification at 222 Maspeth Avenue.

Community Air Monitoring Plan Summary

Continuous community air monitoring is on-going.  For the period between 11/19/2023 through 11/30/2023, there were no measured readings above action levels associated with site activities for Total Volatile Organic Compounds (TVOC), and there were two isolated measured readings above action levels for Particulate Matter (PM-10) that were promptly mitigated (readings above action levels were on 11/22 and 11/28/2023).