Updates
March 2024

The Record of Decision (ROD) for the Site was issued by the NYSDEC in September 2020. The approved remedy for the Site includes a surface cover, institutional controls, and dense non-aqueous phase liquid (DNAPL) recovery.

Beginning in April 2022, the Nassau Gas Works MGP Site entered the Pre-Design Investigation (PDI) phase of the project in which six recovery wells were installed in zones of potential DNAPL recovery. Recovery wells were installed at depths determined by the visual observations made during the soil boring stage. After installation, recovery wells were developed and gauged for the presence and thickness of DNAPL immediately prior to and after well development. Recovery wells are monitored on a monthly basis and DNAPL recovery is conducted as needed to prevent the DNAPL from over topping the sumps.

The PDI report was approved on March 6, 2024. A Remedial Action Work Plan (RAWP) was a requirement of the PDI report approval and the RAWP to install additional Recovery Wells will be submitted to the NYSDEC in Spring 2024.