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Record of Decision System (RODS)



Address:  OFF RTE 40 
City & State:  EDGEWOOD  MD  21010
County:  HARFORD
EPA ID:  MD2210020036
EPA Region:  03
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-96/230
ROD Date:  09/27/1996
Operable Unit(s):  11
Media:  Groundwater
Contaminant:  Trichloroethene, 4-4-DDT, 4-4-DDE, PAHs, organics, metals, arsenic, copper, manganese, nickel, methoxychlor, 4-methylphenol, fluoranthene, pyrene, cadmium, cobalt, manganese, selenium, nitrobenzene, xylenes
Abstract:  Please note that the text in this document summarizes the Record of Decision for the purposes of facilitating searching and retrieving key text on the ROD. It is not the officially approved abstract drafted by the EPA Regional offices. Once EPA Headquarters receives the official abstract, this text will be replaced.

Aberdeen Proving Ground (APG) is located about 45 miles north of Baltimore, Maryland. Cluster 1 is part of APG in the Lauderick Creek Study Area. APG is bordered to the east and south by the Chesapeake Bay, to the west by Gunpowder Falls State Park, the Crane Power Plant, and residential areas, and to the north by the towns of Edgewood, Joppa, Magnolia, Perryman, and Aberdeen. APG is divided into 13 study areas comprising 55 clusters that encompass potential sources of contamination. Cluster 1 of the Nike Site is part of the Lauderick Creek Study Area. The remaining clusters of the Lauderick Creek Study Area and the other study areas are being addressed as separate actions.

The Nike site, is located in the northeast section of the Edgewood Area. The Nike Site is bordered to the west and north by the installation boundary, the Amtrack railroad tracks, and residential areas, and by wooded and marshy areas of the Lauderick Creek area to the south and east. The Nike site consists of 300 acres, of which about 102 acres was originally designated for closure under the Department of Defense Base Realignment and Closure (BRAC) program. The launch area, located at the northern end of Cluster 1 to the west of Monks Creek, includes six abandoned missile silos, several buildings, a landfill of approximately 1 acre, and a septic tank/subsurface sand filter bed system. An abandoned underground fuel oil storage tank was removed from the launch area in 1991. The barracks area, located southwest of the launch area consists of five buildings, a septic tank, and a subsurface sand filter bed. In addition, five underground fuel oil storage tanks were installed in the barracks area in 1957, and four still remain in use.

Cluster 1 and the surrounding area consist of forest, open field, and wetlands. The adjacent area north of the Amtrak line consists of forest and a residential subdivision. All residents are expected to use the public water supply. The use of wells for domestic water supply in homes in the area was discontinued in the 1970s when public water service was established.

The Lauderick Creek Area was used by the U.S. Army Chemical School for a wide variety of chemical warfare training activities from 1920 to 1951. Training activities included the use and firing of chemical ordnance; identification of chemical agents, riot control agents, smokes, chemical ordnance, and chemical-agent-contaminated material. The materials used in training included smoke and tear gas, high explosives, and lethal-agent-filled munitions. As a result of these training activities, unexploded has often been found and is still present in the Lauderick Creek Area.

The Nike site, constructed in School Fields Four and Seven of the Lauderick Creek Area, was used for deployment of Nike antiaircraft missiles between 1954 and 1973. The Army deployed Nike missiles at many sites throughout the United States to protect major cities and strategic military installations from aerial attack. The Nike missiles were removed from the missile silos when the Nike site was decommissioned in 1973.

The Mike site APG consists of the missile silo area, the Barracks Area, and the Control Area. In the Nike site missile silo area, Nike missiles were assembled, stored, and maintained within each of the six silos.

The Maryland National Guard has leased the area since 1973 and uses the area for light infantry training.
Remedy:  This action addresses the principal threats at the Nike site in four ways; extracting and treating contaminated groundwater, isolating the Launch Southwest Landfill as a potential source of contamination by installing an impermeable composite cap, removing contaminants from the sanitary sewer system and filling the system with an inert material, and accepting the interim missile silo remedial action as the final action.

The selected remedy for contaminated groundwater includes removal of groundwater using extraction wells and treatment of the water using aboveground reductive dehalogenation; discharge of treated water to a tributary of the Bush River; long-term groundwater monitoring to ensure reduction of contaminants to clean-up levels; land-use restrictions prohibiting the use of on-site groundwater.

The selected remedy for the launch southwest landfill includes: installation of a composite cap over the landfill; institution of land-use restrictions; installation of a chain link fence; installation of groundwater monitoring wells and long-term groundwater monitoring.

The selected remedy for the sanitary sewer system is composed of: removing sludge from the sewer system; high-pressure water blast sewer lines, manhole, and tanks to clean the system; fill the clean tanks, manholes, and pipes with inert material; remove all surficial structures, regrade, and vegetate; and dispose of the sludge and wash water off-site.

No further action is necessary at the Nike Missile silo. It is recommended that the removal action conducted there be accepted as the final action.
Text:  View full-text ROD [ 139K ]
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