Superfund Site: MILLSBORO TCE, MILLSBORO, DE
Superfund Site Profile
The Millsboro TCE Site is located in the town of Millsboro, Sussex County, Delaware. The Site consists of a source area at the intersection of Wharton Street and S. DuPont Highway, groundwater wells located at the Town of Millsboro’s Wellfield on West Church Street, and the impacted groundwater under the properties in between. The Site is approximately 1500 feet long and 300 feet wide.
From 1952 through 1999, a number of different entities opeated poultry vaccine manufacturing operations at the site. The facility buildings were demolished in 2000. In October 2005, the state water authority detected trichloroethylene (TCE) at a concentration that exceeded the national drinking water standard while conducting a routine water sampling. The Site was proposed to EPA's National Priorities List in 2009.
The Town of Millsboro is currently filtering groundwater and sampling drinking water to ensure there are no detectible levels of TCE in drinking water. Cleanup actions will continue to address contaminated soil and groundwater at the Site.
TOPICS IN FOCUS
An Enforcement Action Memorandum was signed in January 2017. The Enforcement Aciton Memorandum selects the preferred means to address contaminated soil and groundwater at the Site. The major components of the proposed remedy are in-situ chemical oxidation of the source area, direct groundwater circulation pump and treatment using granular activated carbon to treat extracted groundwater that will then be re-injected into the shallow aquifer, and long-term monitoring to ensure the safety and effectiveness of the selected remedy. The April 2016 Fact Sheet gives further informaiton about the cleanup.
It is important to note that the Town of Millsboro is currently filtering groundwater through activated carbon to meet drinking water standards and ongoing sampling continues to show that there are no detectible levels of TCE in the drinking water.