Record of Decision System (RODS)
WOODLAWN COUNTY LANDFILL
|Site Name:||WOODLAWN COUNTY LANDFILL|
|Address:||FIRE TOWER & WAIBEL RDS.|
|City & State:||COLORA MD 21917|
|NPL Status:||Currently on the Final NPL|
The Woodlawn Landfill site is located in a rural and residential area approximately one mile north of the intersection of Route 275 and 276 in Colora, Cecil County, Maryland. The Woodlawn Transfer Station, which began operations in June 1978, is located in the northeast corner of the site near the intersection of Firetower Road and Waibel Road. The site property is 38 acres and was a privately owned gravel quarry before 1960 when it was purchased by Cecil County. The County owned and operated a municipal landfill at the site from 1960 until June 1978 when the landfill was closed to municipal waste under order from the State of Maryland Department of Health and Mental Hygiene (MDHMH). From 1960 to 1978, agricultural, municipal and industrial wastes were disposed at the site.
The U.S. Environmental Protection Agency (EPA) placed the Site on the National Priorities List (NPL) in July, 1987. On December 28, 1988, EPA and two Potentially Responsible Parties (PRPs), the Firestone Tire & Rubber Company (now known as Bridgestone/Firestone) and Cecil County, entered into an Administrative Order on Consent whereby the two PRPs agreed to perform a Remedial Investigation and Feasibility Study with EPA oversight.
A Record of Decision was issued for this Site on September 28, 1993. A Record of Decision Amendment was completed in September 1999 which describes the revised selected remedy for the contaminated soils and ground water and explains why EPA is changing the selected remedy. EPA is the lead agency for response activities at the Site. Maryland Department of the Environment is the support agency for this response action.
Soil Cover, Monitored Natural Attenuation of Ground Water Alternative:
This alternative would use the in situ treatment processes naturally occurring at the Site to restore the ground water quality. An impermeable landfill cap will no longer be constructed; instead, a vegetated soil cover will be constructed over the 20.5-acre landfill. The soil cover would be a minimum of 24 inches thick and deep rooted trees and plants will be acceptable.
A long-term ground water monitoring plan would be implemented to document that the natural attenuation mechanisms that are currently effective in attenuating contaminants at the Site continue, to ensure that concentrations of contaminants continue to decline and achieve cleanup standards, and to ensure continued protection of human health and the environment. As an added safety measure, the ground water monitoring plan includes wells placed up gradient of potential receptors to ensure that any significant changes in ground water conditions are identified early. In the event that a significant potential risk of exposure was identified, a plan to eliminate that potential exposure would be implemented. This contingency plan would implement localized ground water pumping and treatment, provide an alternate water supply, and evaluate the need for source control. Surface water from the Unnamed Creek would be monitored concurrent with the ground water. The creek would be monitored during and after landfill cover installations.
An engineered surface water runoff and erosion control system would be designed in accordance with State Storm Water Control Regulations and installed to control surface water runoff. The system would include surface grading and storm water retention basins with outfall structures, as necessary. The septic system drain field, which is currently operating will not be affected.
An effort would be made to return the landfill property to a beneficial use. The most likely reuse option would be the creation of a wildlife habitat area. The areas disturbed by the soil cover construction activities would be revegetated with a diverse seed mix of grain and/or wildflowers. Other reuse options (i.e., a nature center, golf course, etc.) would be available provided that the integrity of the remedy was maintained and State and local regulations were met. A security plan would be developed to minimize vehicular traffic and the potential for unauthorized dumping on the property.
Estimated Capital Cost: $1,280,000
Estimated Annual O & M Cost: $269,000
Estimated Present Worth Cost: $6,228,400
The selected remedial action for this site includes excavating an estimated 15 yd3 of mercury contaminated soil (<1
mg/kg mercury) from the former drain field of the Transfer Station septic system, disposing of soil at an offsite
RCRA permitted disposal facility; constructing a soil cover on the 20.5-acre portion landfill; monitored natural
attenuation for ground water; implementing ground water, surface water, and air/landfill gas monitoring programs;
providing an alternate water supply or wellhead treatment to any residents with wells that are contaminated with site
related contaminants at concentrations that exceed the cleanup levels, if necessary; characterizing and disposing of
any residual wastes that are generated from the wellhead treatment offsite; implementing institutional controls,
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