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Record of Decision System (RODS)



Address:  OFF RTE 40 
City & State:  ABERDEEN  MD  21005
County:  HARFORD
EPA ID:  MD3210021355
EPA Region:  03
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/541/R-97/092
ROD Date:  09/23/1997
Operable Unit(s):  02
Media:  Groundwater,soil,surface water,sediment
Contaminant:  Pesticide containers, swimming pool paint, asbestos, solvents, waste motor oil, transformer oil, polychlorinated biphenlys, pesticides, rodenticides, wastewater treatment sludge, chemical warfare material
Abstract:  Michaelsville Landfill is located in the north-central portion of the Aberdeen Area of Aberdeen Proving Ground (APG) in Maryland. APG is a 72,500-acre Army Installation located in Harford and Baltimore counties on the western shore of the Upper Chesapeake Bay. The installation is bordered to the east and south by the Chesapeake Bay; to the west by Gunpowder Falls State Park, the Crane Point Power Plant, and residential areas; and to the north by the towns of Edgewood, Joppa, Magnolia, and Aberdeen.Operations at Michaelsville Landfill Area (MLF) began in late 1969 and continued through 1980. Landfill operations included trench-and-fill disposal of domestic and non-industrial waste from sources at APG. Based on verbal and written evidence, other material that may have been disposed of in MLF includes pesticide containers, rabbit droppings, swimming pool paint, asbestos, shingles, solvents, waste motor oil, transformer oil containing polychlorinated biphenyls, pesticides, rodenticides, and wastewater treatment sludges. Since waste was received from the Edgewood area, there is a possibility that substances contaminated with chemical warfare may be present in MLF. Agent degradation compounds were found in a few wells supporting this possibility.In 1981, the Harford County Department of Health recommended capping the landfill. In response, an impervious soil cap was placed on MLF in 1983. Follow-up inspections in 1983 and 1985 indicated that the landfill cap did not appear to be functioning properly to prevent water infiltration into the landfill. Leachate seeps occurred several times between capping in 1983 and 1991. In 1991, a leachate collection system was installed along the northwestern side of MLF to provide for proper disposal of the leachate. In 1994, a new, multilayered cap system with a geosynthetic membrane was installed in accordance with sanitary landfill requirements. Installation of the new cap included surface water controls for seasonal precipitation and the installation of a methane gas venting system within the landfill cap system. The leachate collection system installed in 1991 was removed and replaced by a new drainage system.
Remedy:  The selected remedy at this site is no further action monitoring to verify that no unacceptable exposures to potential hazards posed by conditions at MLF Operable Unit 2 (OU 2) will occur in the future.
Text:  View full-text ROD [ 44K ]
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