Health & Safety

Committed to Public Health & Safety

Some contaminated soils remain at the site near the source areas in Operable Units 1 and 3. However, these soils lie below clean soil, buildings or asphalt, and people will not come in contact with contaminated soils unless they dig below the surface materials. Contaminated groundwater in each of the operable units is not used for drinking or other purposes and the area is served by a public water supply that obtains water from a different source not affected by this contamination.

Measures are in place to control the potential for people to come in contact with subsurface soil and groundwater contamination that has migrated off the site. Volatile organic compounds in the groundwater may move into the soil vapor (air spaces within the soil), which in turn may move into overlying buildings and affect the indoor air quality. This process, which is similar to the movement of radon gas from the subsurface into the indoor air of buildings, is referred to as soil vapor intrusion. The potential for people to inhale site contaminants in indoor air due to soil vapor intrusion in off-site buildings has been extensively evaluated, and the environmental sampling conducted to date indicates that soil vapor intrusion is not a concern for off-site buildings located over site-related groundwater contamination.

National Grid is committed to protecting the public and its employees' health and safety as it continues cleanup efforts at historic MGP sites.