Case Study - Initial Response Action and
Ground Water Investigation
Project Overview
Approximately 1,900 gallons of heating fuel oil were released from a fitting connecting the high school’s boiler room day-tank to a 10,000-gallon underground storage tank. The fuel oil was released to the floor of the boiler room, part of which had an unfinished crawl space that allowed for the fuel oil to migrate into the underlying soil and ground water. Initial response efforts in the days and weeks following the release resulted in the recovery of approximately 1,400 gallons of the fuel oil. Working closely with the school administration around school operation schedules, EnviroSense completed sub-slab soil gas and indoor air quality monitoring to assess potential migration pathways into the classroom areas of the building. Ground water monitoring wells were installed and ground water quality between the release area and a brook abutting the school property was assessed. Fuel oil recovery wells were also installed and fuel oil product was recovered from the ground water. The site is currently being managed under a New Hampshire Department of Environmental Services Groundwater Management Permit.
EnviroSense Role
- Completed an Initial Response Action that included the removal of 6.34 tons of petroleum-impacted soil from the crawl space.
- Collected soil samples for laboratory analysis and assessment.
- Advanced borings through the boiler room slab and screened soil gas and soil samples.
- Installed six ground water monitoring wells and three product recovery wells.
- Collected ground water samples for laboratory analysis and assessment.
- Determined ground water flow direction and evaluated dissolved-phase contaminant transport.
- Conducted product recovery from the product recovery wells.
- Conducted sub-floor soil gas sampling in the school to evaluate potential vapor-phase contaminant transport.
- Completed and submitted a Groundwater Management Permit (GMP).
- Completed and submitted a GMP renewal.
