Superfund Site Profile
The New Cassel/Hicksville Ground Water Contamination site (Site) is an area of widespread groundwater contamination in the Towns of North Hempstead, Hempstead and Oyster Bay in Nassau County, New York. Sampling found contaminants in four Town of Hempstead wells, six Hamlet of Hicksville wells and one Village of Westbury well. The primary contaminants observed in groundwater at the Site are tetrachloroethylene (PCE), trichloroethylene (TCE) and other volatile organic compounds (VOCs). VOCs are contaminants that evaporate easily into the air and dissolve in water. VOCs are often used as ingredients in paints, solvents, aerosol sprays, cleaners, disinfectants, automotive products and dry cleaning fluids. It is believed that past industrial and commercial activities in the area may have contributed to the groundwater contamination at the site. Consistent with the Safe Drinking Water Act that protects public drinking water supplies throughout the nation, the public water suppliers in the area of the Site monitor water quality regularly and have previously installed treatment systems to remove VOCs from groundwater.
From 1988 to 2010, the New York State Department of Environmental Conservation (NYSDEC) identified a number of sources of the contamination and further investigated the contaminated groundwater pursuant to New York State authorities. In 2010, NYSDEC requested that EPA list the Site on the Superfund program’s National Priorities List (NPL). The Site was listed on the NPL in September 2011. EPA is addressing the Site in discrete phases or components known as operable units or OUs. After the Site’s NPL listing, site investigations to determine the nature and extent of contamination and to identify and evaluate remedial alternatives began