Investigation & Remediation2018-06-11T16:08:55+00:00

Investigation and Remediation

As required by state environmental cleanup regulations, National Grid is proposing to conduct cleanup (“remediation”) activities in both the upland and marine portions of the former MGP Site.

In 2005, the Massachusetts Department of Environmental Protection (MassDEP) assigned Release Tracking Number 3-25126 to the Site. A Release Tracking Number is a case number assigned by MassDEP to track projects. Since then, National Grid has undertaken a series of studies in accordance with MassDEP regulations (i.e., the Massachusetts Contingency Plan). The regulations require the following steps to investigate and remediate a site:


Phase  I – Initial Site Investigation and Tier Classification

Between 2005 and 2006, National Grid collected soil and water samples from the Site and submitted a Phase I report to MassDEP. The Phase I study indicated that compounds related to the former Manufactured Gas Plant (MGP) were present beneath the ground surface at the Site.

Phase II – Comprehensive Site Assessment

After confirming the presence of MGP compounds, National Grid collected and analyzed hundreds of additional samples over a five-year period. National Grid collected samples from the upland properties where the former MGP had been located and from the harbor adjacent to these properties, and submitted the results to MassDEP in a Phase II report in July 2011. The Phase II report described the types of MGP-related compounds found at the Site and how they migrated through the environment to their current locations. (See the Phase II page of this website for details.) The report also documented the upland and marine areas of the Site that need to be remediated (or cleaned up) before the Site can meet the State’s cleanup requirements.

Phase III – Identification and Selection of Comprehensive Remedial Action Alternatives

In February 2012, National Grid submitted a Phase III Remedial Action Plan (RAP) to MassDEP, which presented the benefits and drawbacks of the different technologies that could potentially be used to remediate the MGP compounds at the Site. (See the Phase III page of this website for details.) National Grid used MassDEP criteria to select the most feasible and effective technologies for the conditions present in Gloucester. The remedial project is now in the engineering and permitting phase. The Design page of this website describes various elements of the project design. Before cleanup activities can begin, the project will require permits from federal, state, and local agencies. The Permits page outlines the status of permit submittals and approvals. After all the agencies issue approvals, the Project will move into Phase IV, i.e., the cleanup of the compounds from the Site. The Project Mitigation section describes the measures that National Grid will undertake to limit the project’s impacts to the community and environment.

Phase IV – Implementation of the Selected Remedial Action Alternative

This phase will begin after permits for the cleanup have been received from multiple local, state, and federal regulators.

Phase V – Operation, Maintenance, and/or Monitoring

This phase will begin after remedial equipment has been installed at the Site.