July 10, 2020

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 by the middle of 2021.  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, and the use of temporary enclosed fabric structures with air handling systems to control air emissions from the excavation work within the fabric structure.
• 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:

• Transportation of materials off-site for disposal and recycling
• Installation of the Parcel 3 bulkhead headwall and anchor wall sheets
• Installation of Parcel 3 bulkhead tie back system
• Removal of Parcel 3 steel sheet piles installed for support of excavation
• Installation of steel sheet piles for Parcel 1 soil remediation area support of excavation
• Installation of temporary membrane structure at Parcel 1 soil remediation area.

Recently completed activities:

• Installation of noise mitigation wall on Parcel 1
• Removal of Parcel 3 temporary membrane structure
• Installation of controlled low strength material gravity wall for Parcel 1 soil remediation area support of excavation

Upcoming work activities:

• Initial phase of Parcel 3 soil remediation area excavation

Community Air Monitoring Plan Summary

Continued community air monitoring.  For the period 7/02/20 through 7/08/20 there were no levels above the 15-minute Action Limit for Total Volatile Organic Compounds (TVOC).  On 7/02/20, there was one 15-minute level above the Action Limit for Particulate Matter (PM-10) [smoke from chainsaw] within the northwestern Site boundary near the intersection of Smith and 5th Streets.  The chainsaw activity was limited and was completed when the Action Level alert was received.  Additionally, no dust was observed leaving the Site during this period.  No additional levels above the 15-minute Action Limit for PM-10 occurred during the reporting period.

Completed controlled low strength material gravity wall for support of excavation on Parcel 1.

Installation of Parcel 3 bulkhead anchor wall sheets.