National Grid Paerdegat Basin IRM
October 2021 to January 2022
- Remedial excavation
- Sheeted access pits
- Asphalt concrete restoration
- Management, transport and disposal of TSCA (toxic substance control act) PCB contaminated soil
This project involved cleanup of released gas condensate from an abandoned pipe into surrounding storm drains, soil and the Paerdegat Basin. The project included road closures, trench box excavation of PCB Contaminated Soil, backfill, the installation of access pits for active gas main inspection, cleaning and closure of abandoned gas main, and asphalt and concrete restoration. Posillico also handled the management, transport and disposal of TSCA (toxic substance control act) PCB contaminated soil and water.
WHAT MADE THIS JOB COMPLEX
The location of this project posed challenges including its proximity to a public park which remained open throughout the duration of work as well as an active roadway. There were also active water service lines within the excavation area, not previously known/identified by the water company.
HOW POSILLICO SOLVED IT
For safety purposes, we set up a barrier and fence to prevent accidental entrances to the work area by pedestrians and had a full-time flagger at the pedestrian crosswalk. Regarding the water service lines, we switched to a vacuum excavator to trench and locate the lines and excavated around them. Throughout the project, Posillico worked closely with National Grid to communicate with the public, being sure to keep them appraised of the project and progress.