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Dwyer Property Groundwater Plume
EPA Region 3 (Mid-Atlantic)
Elkton, Cecil County
EPA ID# MDD985366756
1st Congressional District
Last Update: February 2014
Current Site Status
The Dwyer Property Groundwater Plume was proposed to the National Priorities List on October 21, 2010. The site became final on the NPL in March of 2011.
A public availability session was held on March 30, 2011 at the Elkton High School.
The Remedial Investigation/Feasibility Study (RI/FS) has been delayed due to complications due to legal issues with the potentially responsible parties (PRPs). Field work for the RI/FS, which will be performed under EPA-lead, is projected to start in the summer of 2014.
The Dwyer Property Groundwater Plume site is located north of the intersection of Maryland Route 545 (Blue Ball Road) and Maryland Route 279 (Elkton Road), in Elkton, Cecil County, Maryland. The site is located in the area of former explosives manufacturing facilities known as Triumph Explosives and Aerial Products. This company manufactured products for the military. It has been inactive since 1972, and is currently abandoned and overgrown. The site consists of a two distinct groundwater plumes contaminated with volatile organic compounds (VOCs). A specific source of the VOCs in the northern plume has been identified on the property; however, a specific source for the southwestern plume has not been identified. The VOC plumes were initially identified by the Maryland Department of the Environment (MDE). MDE has performed a number of investigations at the site to try to determine the potential sources and extent of the plume.
- Site Responsibility
Cleanup of this site is the responsibility of federal and state governments, and parties potentially responsible for site contamination.
- NPL Listing History
The site was proposed to the NPL on October 21, 2010. The site became final on March 10, 2011.
Threats and Contaminants
The groundwater has been contaminated with volatile organic compounds (VOCs), mainly trichloroethylene (TCE). Other groundwater contaminants include PCE, cis-1,2-DCE, 1,1-DCE, 1,1,2,2-TCA, 1,2-dibromomethane, carbon tetrachloride, naphthalene, vinyl chloride and perchlorate. The potential for exposure to contaminated groundwater and indoor vapor poses a threat to human health. The Site poses a potential risk for buried UXO.
Contaminant descriptions and risk factors are available from the Agency for Toxic Substances and Disease Registry, an arm of the CDC.
MDE first became involved at the site as a result of a real estate transaction. As part of a Preliminary Assessment, three wells were installed. Analytical results of groundwater indicated high concentrations of chlorinated volatiles in the parts per million range.
Successive investigations by MDE in the mid 1990s to 2005 expanded the areas of contamination. The MDE investigations primarily focused on TCE in groundwater.
In March 2010, MDE performed an expanded remedial investigation (ERI) that discovered a dense non-aqueous chlorinated solvents (DNAPL) source composed mainly of TCE.
Other years of investigation, MDE installed a total of 74 monitoring wells, 12 piezometers, 36 soil borings and 5 stream gauging stations. In addition, a soil vapor survey and multiple ground water sampling events were conducted.