September 2025

Supplemental Remedial Investigation Commences

Supplemental Remedial Investigation (SRI)

Supplemental Remedial Investigation (SRI) field work was conducted in June at the former Williamsburg Works MGP site under a New York State Department of Environmental Conservation (NYSDEC) approved SRI Work Plan. The purpose of the work was to vertically delineate groundwater adjacent to the site, on Parcel 6.

The work consisted of installation and development of nine monitoring wells on Parcel 6. The work commenced in June 2025 and was completed in July 2025. Information from the well monitoring will be used to develop a draft SRI Report, which National Grid will submit to NYSDEC.

A map of the site and parcels can be seen on the Site Description tab.

Ongoing Activities:

• Development of the Remedial Alternatives Analysis Report for Parcels 2, 3 and 4.
• Development of the Parcel 6 SRI report.

Upcoming Activities:

• Parcel 6 SRI field work began in June 2025 and included the installation of 9 soil borings for groundwater monitoring wells. Community Air Monitoring was conducted during all invasive activities.
• Submittal of Parcel 6 SRI Report.
• Submittal of Remedial Alternatives Analysis Report for Parcels 2, 3 and 4.
• Development of a Parcel 5 SRI Work Plan.