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Record of Decision System (RODS)



City & State:  COLORA  MD  21917
County:  CECIL
EPA ID:  MDD980504344
EPA Region:  03
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-93/171
ROD Date:  09/28/1993
Operable Unit(s):  01
Media:  Soil, Debris, GW
Contaminant:  VOCs, Other Organics, Metals
Abstract:  The 37-acre Woodlawn County Landfill is a former municipal landfill located in Colora, Cecil County, Maryland. Land use in the area is predominantly rural and residential. The estimated 3,215 people who reside in the area use the ground water as their sole source of drinking water. An unnamed creek crosses the southern end of the site, and in the southcentral area of the site, there is a retention basin to collect precipitationrunoff from the landfill, of which a portion contains a wetland area. Prior to 1960, the site was a privately-owned sand and gravel quarry. From 1960 to 1978, Cecil County operated a municipal landfill for the disposal and sometimes burning of municipal, industrial, and agricultural waste. The Firestone Tire and Rubber Company initially disposed of PVC sludge, containing residual vinyl chloride throughout the landfill. From 1978 to 1981 disposal was limited to two disposal cells, known as Cell A and Cell B/C, under a State industrial waste disposal permit. In 1981, Firestone covered Cell B/C with eight inches of clay and soil in response to an agreement with the State. In 1978, the landfill was closed for the disposal of municipal waste and the Woodlawn Transfer Station began operations in the northeast corner of the site. The Transfer Station, which is still operating, accepts and compacts municipal and commercial waste for disposal in another County landfill. From 1978 to 1990, liquid waste from the compacting process was discharged to the Transfer Station septic system located west of the Transfer Station. Following an overflow of effluent from the septic system to the ground surface in 1990, liquids from the trash compactors were re-routed to an onsite holding tank and periodically taken offsite to a nearby wastewater treatment plant. In 1981 and 1982, site investigations revealed acetone, methylene chloride, methanol, vinyl chloride, benzene, and toluene contaminants in ground water samples taken from various monitoring wells. This ROD addresses a final remedy for the contaminated soil and ground water at the site. The primary contaminants of concern affecting the soil, debris, and ground water are VOCs, including PCE, TCE and vinyl chloride; other organics, including PAHs, pesticides, and phthlates; and metals, including arsenic, cadmium, manganese, and mercury. SELECTED REMEDIAL ACTION: The selected remedial action for this siteincludes testing andexcavating an estimated 400 yd[3] of mercury- contaminated soil (>1 mg/kg mercury) from the former drain field of the Transfer Station septic system disposing of soil found not to exhibit the RCRA toxicity characteristic for mercury at the center of the landfill and/or disposing of soil found to be hazardous at an offsite RCRA-permitted disposal facility; relocating the currently operating septic system drain field; capping a 31-acre portion of the landfill and identifiable cells of PVC sludge with a clay cap, with a gas collection system; installing an estimated 40 recovery wells; extracting contaminated ground water from the aquifer using multiple recovery wells; using a three-step treatment process onsite consisting of precipitation and flocculation/coagulation to remove manganese and other inorganics, followed by air stripping to remove VOCs, and granular activated carbon to remove SVOCs; discharging the treated water to the onsite stream; characterizing and disposing of any treatment residuals offsite; 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; characterizing and disposing of any residual wastes that are generated from the wellhead treatment offsite; and implementing institutional controls, including deed and ground water use restrictions. The estimated present worth cost for this remedial action is $23,826,000, which includes an estimated annual O&M cost of $1,609,000 for 30 years. PERFORMANCE STANDARDS OR GOALS: Chemical-specific soil excavation goals were based on the Summers Model and EPA guidance, and include mercury 1 mg/kg and vinyl chloride 7.7 ug/kg. Chemical-specific ground water cleanup goals are based on risk- or health-based levels, and include arsenic 1 ug/l; manganese 160 ug/l; PCE 1.5 ug/l; TCE 5 ug/l; and vinyl chloride 1 ug/l. If the risk- orhealth-based levels are found to be lower than background, or below the levels that can be detected, background levels or practical quantitation limits may be taken into account. INSTITUTIONAL CONTROLS: Institutional controls in the form of deed and ground water use restrictions will be implemented in order to prevent installation of drinking water wells on properties which overlie the ground water contaminant plume and any future uses of the property that could compromise the effectiveness of the selected remedy.
Remedy:  The Woodlawn Landfill Site is a former municipal landfill comprising approximately 37 acres. The remedial action selected for the Site is a final remedy which will address contaminated ground water, contaminated soils, and wastes buried at the Site. The ground water contamination represents a significant threat. Therefore, remediation of contaminated ground water will be required. The wastes and contaminated soils at the Site pose a relatively low long-term threat. Therefore, the wastes and contaminated soils will be addressed through a combination of engineering and institutional controls.

The selected remedial action includes the following components:
- Excavation and disposal of the soils from the former drain field of the Transfer Station septic system
- Relocation of the current drain field of the Transfer Station septic system
- Capping of the landfill and identifiable cells of PVC sludge
- Extraction of ground water
- Treatment of extracted ground water onsite and discharge to the onsite stream
- Monitoring of ground water, the stream, and landfill gas
- Provision for an alternate water supply, if necessary
- Restrictions on the deed and ground water use
- Perimeter fencing
Text:  View full-text ROD [ 105K ]
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