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Record of Decision System (RODS)



City & State:  PATUXENT RIVER  MD  20670
County:  ST. MARY'S
EPA ID:  MD7170024536
EPA Region:  03
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-96/222
ROD Date:  07/29/1996
Operable Unit(s):  07
Media:  Groundwater.
Contaminant:  Benzene, carbon disulfide, chloroform, 1,1-dichloroethene, 1,2-dic trichloroethene, vinyl chloride, arsenic, beryllium, lead, manganese, thallium.
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.

Naval Air Station (NAS) Patuxent River is a 6,800 acre naval installation located in St. Mary's County, Maryland. The installation is located at the confluence of the Patuxent River and Chesapeake Bay and has been in operation since 1942. The installation is bordered by residential, park, industrial, and commercial properties. Approximately 11,000 military, civilian, and contractual personnel work at the installation.

The Former Sanitary Landfill is approximately 1« mile southeast of the main entrance near the southern border of the installation and adjacent to the intersection of State Route 235 and Hermanville Road. Adjacent and downgradient to the Former Sanitary Landfill (landfill) is the Current Sanitary Landfill.

The landfill is approximately 6« acres in size and operated from 1974 to 1980. Presently, the landfill is covered with two feet of soil and is heavily vegetated. The landfill is surrounded on all sides by a predominantly coniferous forest and two intermittent streams to the east and west. The surrounding wooded area is occasionally used by installation personnel for recreational purposes such as hiking, bird watching, and hunting. Currently, the area is accessible to installation personnel by foot and a gate at the entrance limits vehicular access. The landfill is within « mile of residential dwellings outside the confines of the installation.

Disposal operations at the landfill began in 1974 which consisted of placing solid waste in 10 foot lifts and 50 foot working faces. Once the solid waste was placed in the lifts, it was covered with soil from the borrow area next to the landfill. The borrow area for the landfill during its operation is now known as the Current Sanitary Landfill. It is estimated that the landfill received about 22,500 tons of plastic and paper trash. It is estimated that the landfill received approximately 43 tons of oil contaminated soils and liquid wastes consisting of petroleum-oil lubricants, solvents, thinners, paints, small amounts of pesticides, and photographic wastes. The liquid wastes were predominantly residues left in cans, rags, and absorbents. The landfill operated from March 1979 until September 1980 when it was closed.

During construction of the Current Sanitary Landfill, a leachate collection system was extended along the downgradient perimeter of the landfill. The system connects the two landfills; therefore, any monitoring of the system includes leachate from both landfills. Monthly monitoring of the leachate began in January 1985.

The initial assessment of the installation was completed in 1984 and the landfill was one of 31 sites identified in the report. A study into the type and extent of contamination was conducted in 1987. Other studies were also conducted between 1990 and 1995.
Remedy:  The major components of the selected remedy include: a cap to be constructed on the landfill (the current sanitary landfill will be capped at the same time since the landfills are connected by a leachate collection system); groundwater and leachate collection system monitoring will be conducted on a regular basis; a landfill gas treatment system will be installed and used to treat landfill gas before discharge to the atmosphere; landfill gas monitoring will be conducted on a regular basis; wetlands impacted by implementation of the interim remedy will be replaced; and land-use controls in the form of deed restrictions will be exercised to limit property use to maintain the integrity of the impermeable cap and to limit possible exposure to landfilled wastes.
Text:  View full-text ROD [ 84K ]
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