Website Update – September 31, 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:

  • Continued construction of underpinning system at 222 Maspeth Avenue.
  • Continued demolition of concrete slab sections at 222 Maspeth Avenue.
  • Transportation (trucking) and offsite removal of demolished concrete at 222 Maspeth Avenue.
  • Air, noise, and vibration monitoring.

Recently completed activities:

  • Completion of test pile load testing for underpinning system at 222 Maspeth Avenue.
  • Test pitting at select areas for former MGP structures at 222 Maspeth Avenue.

Upcoming work activities:

  • Soil excavation at 222 Maspeth Avenue.
  • Transportation (trucking) and offsite removal of excavated soil, demolished concrete, and misc. materials at 222 Maspeth Avenue.
  • Soil excavation, work platform construction, and mobilization of grout mixing plant and mixing equipment in support of In-situ soil stabilization / solidification 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 09/16/2023 through 09/31/2023, there were no measured readings above action levels associated with Site activities for Total Volatile Organic Compounds (TVOC) or Particulate Matter (PM-10).