Jump to main content.



Beginning October 1, 2015, this website will undergo improvements. During this time, access to some information may not be immediately available. For assistance locating information, please contact the Community Involvement Coordinator listed below in the "Contacts" section of this page. Thank you for your patience as we work to improve your access to site information.

Dwyer Property Groundwater Plume

EPA Region 3 (Mid-Atlantic)

Elkton, Cecil County

EPA ID# MDD985366756

1st Congressional District

Last Update: February 2014

Other Names


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.

In November 2011, residential well samples were collected at houses located near the Site by the EPA Emergency Response Personnel. Soil, groundwater and soil gas samples were also collected near the Rudy Park Public Housing units. Results from samples collected from 55-gallon drums in the Summer of 2012 did not indicate disposal of hazardous substances. In the Fall of 2012 a unexploded ordnance survey (UXO) was conducted by EPA personnel in an area of the Site used for waste disposal. The survey did not reveal the presence of UXO in the survey area.

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.

Site Description

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.

Cleanup Progress

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.


Site Contacts

Region 3 | Mid-Atlantic Cleanup | Mid-Atlantic Superfund |EPA Home | EPA Superfund Homepage

Local Navigation

Jump to main content.