Manufactured Gas Plant (MGP) Site in Bay Shore, New York:
A full project description can be found on National Grid’s BayShore website: http://www.bayshoreworksmgp.com/about.html
National Grid has multiple online documents illustrating the proven success of our remediation technology on the Bay Shore former MGP facility for your review on what has proven successful. “Remedial Action Plan for Operable Unit 1” was finalized by the NYSDEC in August, 2004. The Final Remedial Action Plan includes:
- Excavating contaminant source areas in the southern half of the site from the surface to an approximate depth of 8 feet;
- Excavating source areas in four locations to approximate depths of at least 16 feet and to a maximum depth of 25 feet based on field conditions, removal and off-site thermal desorption of impacted soil;
- Backfilling excavated areas to restore existing grades;
- Performing in-situ chemical oxidation to treat residual source material beneath the excavated areas;
- Constructing a subsurface barrier wall at the downgradient edge of OU-1 with in-situ groundwater treatment immediately upgradient of the barrier;
- Recovering mobile tar or dense non-aqueous phase liquid (DNAPL) via extraction wells where practicable; and
- Implementing institutional controls and a site management plan to manage future subsurface disturbance and resultant potential exposures.
- Long term operation, monitoring, and maintenance of the containment and treatment systems.
Oxygen systems were quickly added to enhance aerobic bioremediation of organic compounds, specifically BTEX and naphthalene. The addition of oxygen downgradient to the ozone system, which in itself produces oxygen, provided increased dissolved oxygen to biodegrade the dissolved-phase contaminants. This factor is important as the equipment Piper Environmental Group, Inc. will be proposing for Nicor Gas involves one primary treatment system with full redundancy including air, oxygen, and ozone sparging mechanisms in one plant.