January 28, 2022

National Grid’s contractor, Creamer Environmental, is implementing remedial actions at the Citizens former Manufactured Gas Plant (MGP) Site to address MGP Site related impacts in accordance with the NY State DEC approved design.  Mobilization began on July 10, 2019 and the remedial activities are expected to be completed in early 2022.  The cleanup activities are being performed with oversight by the New York State Department of Environmental Conservation (NYSDEC).  Community air monitoring and vibration monitoring are being conducted during this project.

Overview:

• The key elements of the remediation work include excavation of MGP Site impacted soils and installation of bulkheads using heavy construction equipment.
• Preparation for these key remediation elements requires sheet pile installation to support excavations on site, as well as construction of bulkheads along the Gowanus Canal.
• There are established measures to reduce potential noise, vibration, and dust from the work including pre-drilling before sheet pile driving, installation of a noise mitigation wall.
• Air, noise, and vibration monitoring are conducted each day to ensure that the work is conducted in accordance with the requirements of NYSDEC, NYSDOH and NYC. 

On-going activities:

• Installation of the hydraulic relief system and backfilling north and south of the gas shaft to grade on Parcel II.

• Installation of bulkhead cap on Parcel II.
• Installation of monitoring wells on Parcel I.
• Excavation of soil and demolition of subsurface structures from the Parcel I supplemental excavation area.
• Backfilling the Parcel I supplemental excavation as sections are completed to the design depth.
• Transportation of materials off-site for disposal and recycling.

Recently completed activities:

• Installation of monitoring wells on Parcels II.

Upcoming work activities:

• Installation of offsite monitoring well and product recovery wells on Parcel II.

Community Air Monitoring Plan Summary

Continuous community air monitoring is on-going.  For the period 01/20/21 through 01/26/22 there were no levels above the 15-minute Action Limit for Total Volatile Organic Compounds (TVOC) or Particulate Matter (PM-10) associated with Site activities. 

Installation of the bulkhead cap and backfilling to final grade north of the gas shaft on Parcel II.

Installation of the bulkhead cap and hydraulic relief system south of gas shaft on Parcel II.