Tata & Howard has been providing environmental services for a Site in Wilmington, Massachusetts for several years. The contaminants of concern at the Site are chlorinated volatile organic compounds (CVOCs). The CVOCs were detected in June 1994 as part of a due diligence assessment for bank financing, and the sources of the CVOCs are from prior operations at the Site that utilized chlorinated solvents to clean electronic parts. These compounds were released to the environment through improper disposal and leakage from the equipment that was used onsite.
Remedial activities were performed at the Site to reduce the concentrations of CVOCs in soil and groundwater, and in August 2000, a Class C Temporary Solution Response Action Outcome (RAO) was filed with the Massachusetts Department of Environmental Protection (MassDEP), which concludes that there was no substantial hazard to human health, safety, public welfare, or the environment caused by the contamination at the premises. That conclusion is based on appropriate assessment, testing and analyses, and includes a Method 3 Risk Characterization, which supports those findings. In August 2005, and again in August 2010 and September 2015, the Class C RAO was renewed based on the conclusion that there was, as of the date of each renewal, no substantial hazard caused by the contamination at the premises.
In May 2015, T&H filed a Release Abatement Measure (RAM) Plan for the installation of a sub-slab depressurization system (SSDS) at the Site as part of a Permanent Solution in accordance with MassDEP’s regulations. Based on more recent data, six points and radon type fans were installed in an effort to develop a negative pressure field beneath the western portion of the building. T&H also installed a remote telemetry system equipped with an alarm that will notify MassDEP, Tata & Howard, and the owner of the building if the SSDSs fail as the result of loss of power, mechanical issues, or other disruption of the system.
The building is primarily comprised of office and commercial warehouse space, and an Activity and Use Limitation will be implemented as part of the Permanent Solution to prohibit more sensitive uses in the future, such as daycare or residential.