Superfund

Site Information for
ROLLING KNOLLS LF

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EPA’s Involvement at this Site

The Rolling Knolls landfill operated from the early 1930s through December 1968. During that time, it received municipal solid waste, as well as construction and demolition debris. Chatham Township Board of Health records indicate that the types of wastes deposited at the landfill included tree stumps, scrap metal, tires, household refuse, residential septage wastes and industrial waste. In order to comply with health code regulations adopted in 1959, operational procedures at the facility included the application of herbicides and pesticides to control weeds, insects and rodents, as well as the application of oil on facility roadways to control dust and daily cover over all exposed surfaces.

After initial investigations, EPA placed the site on the Superfund program’s National Priorities List in September 2003.

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What is the current site status?

A baseline human health risk assessment was completed in 2014 and identified potential site risks to trespassers and future residential occupants. The baseline risk assessment was evaluated in 2016 to assess data gap sampling results and the risks identified remain the same. A screening level ecological risk assessment was completed in 2013 and was followed by a baseline ecological risk assessment which is underway.

The remedial investigation to characterize the nature and extent of contamination is ongoing with an estimated completion in 2017. A feasibility study will be prepared in 2017 to identify cleanup alternatives that will address risks posed by site contamination. EPA will develop a cleanup plan after completion of the remedial investigation and feasibility study.

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What's being done to protect human health and the environment?

In 2005, EPA entered into a legal settlement under which potentially responsible parties (PRPs) agreed to conduct and pay for a thorough investigation of site and off-site soil, groundwater and sediment. This investigation will determine the nature and extent of the contamination at the site. After completion of the investigation, the agreement also includes the performance of a study that identifies and evaluates a number of potential cleanup alternatives to address contamination found at the site. To date, EPA continues to search for additional PRPs.

EPA approved the PRPs’ investigation work plan in the summer of 2007. Field work started in July 2007. The field work included visual inspections (including test pits), background soil and groundwater sampling, and on-site surface and subsurface soil and groundwater sampling, as well as follow-up sampling in areas determined to require further exploration. Data gaps were identified and additional sampling was conducted in 2015. Biota sampling and analyses were conducted in 2016 for an ecological risk assessment. Site groundwater investigations are ongoing.
 

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