EPA will hold a public meeting to explain the proposed plan at the Cinnaminson Superfund site
The U.S. Environmental Protection Agency (EPA) has determined that no further action is needed to address two closed landfills at the Cinnaminson Ground Water Contamination Superfund site in the townships of Cinnaminson and Delran, N.J. The site, which covers approximately 400 acres, includes residential and industrial properties and the two landfills. As a result of historic operations throughout the site, the groundwater and soil are contaminated with volatile organic compounds and heavy metals, which can have serious health effects. EPA will require that the groundwater continue to be monitored.
The agency determined that no further cleanup actions are needed at the landfills, because the actions already taken have been successful. Additionally, a review of conditions at the site shows that the threat of further release of contaminants from the landfills to groundwater has been addressed. Groundwater monitoring conducted over the past 26 years confirms the effectiveness of those actions.
EPA will hold a public meeting on May 12 to explain the proposed plan and is encouraging public comments. The meeting will be held at 7 p.m. at the Cinnaminson Community Center at 1621 Riverton Rd. in Cinnaminson, N.J. Comments will be accepted until May 29.
The landfill property on the site was originally a sand and gravel mining operation. Later, solid waste, including hazardous substances, were dumped in the mining pits. Sanitary Landfill Inc., a subsidiary of Waste Management Inc., operated the landfills from 1970 until they closed in the 1980s. The site was first addressed by the New Jersey Department of Environmental Protection, with EPA taking over when the site was added to the Superfund list in 1986.
EPA's cleanup of the site has been conducted in phases to facilitate the long-term restoration of the area. In 1987, Sanitary Landfill Inc. covered the landfills with a clay cap to keep water from mixing with the contaminants and spreading the groundwater contamination. A landfill gas management system to collect and control landfill gas was expanded in 1996.
In the first phase of the EPA cleanup in 2000, SC Holdings Inc., a successor to Sanitary Landfill Inc., constructed a groundwater treatment system to clean the polluted groundwater and installed wells to measure and monitor groundwater contamination. The groundwater monitoring for volatile organic compounds and metals is ongoing and performed twice a year.
In September 2010, EPA began investigating whether vapors from the groundwater contamination in the area were getting into nearby homes. Approximately 60 properties were sampled and two required mitigation systems to vent the contaminated vapors. These systems have been installed.
In the second phase of the project, SC Holdings Inc. will continue to monitor the groundwater and the landfill caps to ensure that people’s health and the environment are protected. The landfills remain eligible for cleanup work in the event that a change in site conditions should warrant such an action.
The third and fourth phases of the cleanup will address soil and groundwater contamination in other areas of the site.