The following are the steps most often required by the New York State Department of Environmental Conservation in the investigation and remediation of a former MGP site.

Remedial Investigation/Feasibility Study (or Alternatives Analysis)
Interim Remedial Measures
Record of Decision (or Decision Document)
Design and Construction

The Williamsburg former Manufactured Gas Plant site project is now in the Remedial Investigation/Alternatives Analysis phase. Multiple phases of field work for the Remedial Investigation have taken place from 2009 and are continuing.

Remedial Investigation Report:

A Remedial Investigation Report for Parcels 2, 3 and 4 was finalized in August 2025 and included an Executive Summary, a description of the field activities, analytical results compared to NYSDEC guidance and standards, geological findings, Qualitative Human Health Exposure and Fish and Wildlife Impact Assessments.  Appendices will include all of the pertinent data.  Once the report is approved by NYSDEC and NYSDOH, the entire report and a summary Fact Sheet will be made available to the public.

All of this information and analyses will be used to ensure that National Grid and the NYSDEC have a full understanding of the nature and extent of the impacts to the environment of the former MGP operations. This information, in turn, will be used in the development of a Alternatives Analysis, which is an evaluation of technologies and activities to address the impacts as necessary.