Superfund Site: EWAN PROPERTY
SHAMONG TOWNSHIP, NJ
Superfund Site Profile
The Ewan Property site is located in Shamong Township in New Jersey. Waste disposal activities took place at the 43-acre site in 1974 and 1975, resulting in soil and groundwater contamination with volatile organic compounds (VOCs) including acetone, toluene, xylene and trichloroethylene; semi-volatile compounds (SVOCs), and some heavy metals, including arsenic, chromium and aluminum. There are two aquifers below the site that are linked, a shallow Cohansey aquifer and the deeper Kirkwood aquifer. Local groundwater flows in a southerly direction in both aquifers. Local residents in the area are on private potable wells. EPA added the site to the Superfund program’s National Priorities List (NPL) in 1984. This site is being addressed through Federal and Potentially Responsible Party (PRP) actions.
The site is being addressed in 2 operable units. OU1 addresses the heavily and moderately contaminated soils, and OU2 addresses contaminated groundwater and moderately contaminated soils. The OU1 portion of the site was completed in July 1995.
The OU2 groundwater cleanup remedy began in 1995 with the construction of a full-scale groundwater extraction, treatment, and infiltration (GWETS) remedial system that was designed extract to handle a flow of more than 200,000 gallons per day. A total of 6 re-infiltration basins were constructed, covering approximately 200,000 square feet, over the former soils excavation areas. The system was designed to establish hydraulic control of the contaminant plume via a “closed loop” system, with the same water being pumped, treated, and re-infiltrated, until the aquifer was restored. Beginning in March 1999, system underwent an extensive six month period of rigorous tests that were concluded in September 1999. The GWETS operated as designed until June 2006. Following additional limited hot spot groundwater and residual soils actions, that included two soils excavations and dual phase extraction/soil vapor extraction, the full scale GWETS was decommissioned, demolished, and disturbed ground areas were restored and replanted, between November 2015 to May 2016. The site is currently undergoing long-term groundwater monitoring. This activity is ongoing.