(This post is the seventh in a series describing the Site Investigation activities that are taking place or will be in the areas around the Saint-Gobain facility.)
Stormwater generated at the Saint-Gobain facility is collected in a below ground piping network and discharged at an outfall on the Merrimack River. Water has been observed discharging from the outfall even during periods when it has not rained for some time. The source of this “dry weather flow” is thought to be groundwater that leaks into the stormwater piping network in several locations. Saint-Gobain will be spot-lining and grouting sections of the piping network to alleviate the flow. This work started the week of September 17 and will take several weeks to complete.