Site Name: MOSLEY ROAD SANITARY LANDFILL
EPA ID: OKD980620868 EPA Region: 06 Metro Statistical Area: 5880
MOSELEY RD BTWN NE 23 & NE 36, OKLAHOMA CITY, OK 73117
Operable Unit: 01
ROD ID: EPA/ROD/R06-92/070 ROD Date: 06/29/92
Contaminant: Organics, Metals
Keys: Arsenic; Background Levels; Benzene; Capping; Carcinogenic Compounds; Contingent Remedy; Debris, Direct Contact; Drinking Water Contaminants; Drinking Water Contaminants; Groundwater; Groundwater Monitoring; Groundwater Treatment; Institutional Controls; MCLs; Metals; Onsite Containment; Onsite Disposal; RCRA; Safe Drinking Water Act; Soil; Solvents; State Standards/Regulations; VOCs; Wetlands.
Abstract:
SITE HISTORY/DESCRIPTION: The 72-acre Mosley Road Sanitary Landfill site is an inactive municipal landfill in Oklahoma City, Oklahoma County, Oklahoma. Land use in the area is primarily residential and undeveloped with 875 residents within a one-mile radius of the site. The North Canadian River flows about one-half mile west of the site, and Crutcho Creek flows near the eastern boundary of the site. The site overlies two aquifers: an alluvial aquifer and the Garber-Wellington aquifer, which is a source of drinking water for three cities near the landfill. Both of these ground water areas have been impacted by migration of landfill contaminants. Several wetland areas are located in the vicinity of the landfill. In 1973, the site was permitted as a sanitary landfill, and between February and August 1976, the state authorized the landfill to accept industrial hazardous waste. During this 6-month period, the Mosley Road Sanitary Landfill accepted approximately 1.7 million gallons of mostly liquid industrial hazardous waste. Types of wastes included industrial sludge, caustic material, plating sludge, acid solutions, oil emissions, alkaline solutions, solvents, paint sludge, toxaphene, and TCE. Waste was deposited into unlined waste pits, which are currently buried under 80 feet of municipal refuse. In 1987, the landfill reached its permitted capacity and was closed. In 1988, a compacted clay cover was installed in accordance with existing closure regulations, and the area was vegetated to reduce erosion. This ROD addresses the source (waste pits) and the contaminated ground water as a final remedial action for this site. The primary contaminants of concern affecting the soil, debris, and ground water are VOCs, including benzene, and metals, including arsenic. PERFORMANCE STANDARDS OR GOALS: All potential drinking water impacted by the site will meet SDWA MCLs. Chemical-specific cleanup goals for ground water include arsenic 0.05 mg/l; barium 1 mg/l; selenium 0.01 mg/kg; and vinyl chloride 0.002 mg/kg. Chemical-specific clean-up goals for the soil and debris were not provided. INSTITUTIONAL CONTROLS: Institutional controls will be implemented, including deed, land, and ground water use restrictions.
Remedy:
SELECTED REMEDIAL ACTION: The selected remedial action for this site includes repairing and improving the existing cap and adding a vegetative soil layer to reduce erosion and infiltration; allowing ground water to naturally attenuate; installing a landfill gas monitoring system; using ground water monitoring and periodic sampling to monitor leachate migration; providing a contingency for active ground water extraction and treatment, if after 5 years natural attenuation has not decreased contaminant levels; and implementing institutional controls including deed, land, and ground water use restrictions. The estimated present worth cost for this remedial action is $3,600,000. No O&M costs were provided for this remedial action.