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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/ROD/R03-92/162
ROD Date:  06/30/1992
Operable Unit(s):  01
Media:  Soil
Contaminant:  VOCs, Other Organics, Metals
Abstract:  SITE HISTORY/DESCRIPTION: The 20-acre USA Aberdeen, Michaelsville Landfill is a municipal landfill located along the Chesapeake Bay in Harford County, Maryland. The site is in the northern portion of the Aberdeen Proving Ground (APG) in the Aberdeen Area (AA) between Michaelsville Road and Trench Warfare Road. Land use in the area is predominantly industrial and residential, with a wetland area located south and east of the site. In 1970, operations at the landfill began and continued until its closure in 1980. Previous studies of the landfill operations indicated that trench and fill methods were used to dispose of wastes in the landfill. The majority of materials reportedly disposed of at the site included domestic trash, trash from nonindustrial sources at APG, solvents, waste motor oils, PCB transformer oils, wastewater treatment sludges, pesticides containing thallium, insecticides containing selenium, and rodenticides containing antimony. From 1981 to 1991, the county, state agencies, U.S. Army Environmental Hygiene Agency (AEHA), and U.S. Army Corps of Engineers Waterways ExperimentStation (WES) periodically inspected the site. In 1981, the county recommended that the landfill be capped. In 1983, the state inspected the installed cover and advised the APG personnel to repair two "leachate outbreaks." In 1985, the AEHA discovered that the landfill cover was not functioning properly and suggested that an impervious cap be placed on the landfill. From 1987 to 1990, WES conducted an analysis of ground water from the monitoring wells surrounding the site and concluded that the landfill contributed chemicals to the uppermost aquifer. In early 1991, the state observed several additional "leachate outbreaks" onsite. In mid-1991, a removal action was conducted onsite by APG, which included installing a leachate collection system to control and collect leachate. This ROD addresses protection of the ground water by minimizing leachate flow and preventing current or future exposure to waste materials as the first of two OUs planned for the site. A future ROD will address sediment, surface water, and ground water at and near the site to determine the need, if any, of further remediation at the site. The primary contaminants of concern affecting the soil are VOCs; other organics, including pesticides; and metals, including chromium and lead. PERFORMANCE STANDARDS OR GOALS: The soil clean-up goals for capping the site are established in accordance with state requirements for sanitary landfill and RCRA subtitle C requirements. INSTITUTIONAL CONTROLS: Not provided.
Remedy:  SELECTED REMEDIAL ACTION: The selected remedial action for this site includes replacing the existing cover with a multi-layer cap in accordance with state requirements for sanitary landfills; covering the cap with an earthen cover and revegetating the area; installing a methane gas venting system within the cap system to minimize the migration or accumulation of gases generated by the landfill wastes; and installing surface water controls to accommodate seasonalprecipitation. The present worth cost for this remedial action is $9,207,200, which includes an annual O&M cost of $27,000 for 30 years.
Text:  View full-text ROD [ 52K ]
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