A permeable reactive barrier, or “PRB,” is a wall constructed below ground to clean up contaminated groundwater. The wall is “permeable,” which means that contaminated groundwater can flow ...

In 2007, a $1.4 million permeable reactive barrier (PRB) was installed to protect Green Pond Brook: Comprised of an iron-based sand-like material, a PRB essentially allows groundwater to pass ...

But the underground permeable barrier treatments appear to be working. Hexavalent chromium levels from monitoring wells at the site in July showed at 31,000 micrograms per liter.

Thousands of Cape Cod homeowners may need to replace septic systems under new state regulations; Mass. residents express concerns about cost and feasibility of proposed septic regulations ...