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Record of Decision System (RODS)



City & State:  QUINCY  IL  62301
County:  ADAMS
EPA ID:  ILD980607055
EPA Region:  05
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-93/238
ROD Date:  09/30/1993
Operable Unit(s):  01
Media:  Groundwater, Leachate
Contaminant:  VOCs, Other Organics, Metals
Abstract:  The 56-acre Adams County Quincy Landfill #2 and #3 site is a former municipal landfill in Quincy, Adams County, Illinois. Land use in the area is predominantly agricultural, with a residential area located one mile north of the site. The site is bounded by pastureland to the east, a wooded tract to the south, private land to the west, and Old Broadway Road to the north. Although the area is generally rural, there are residences across Old Broadway Road located to the north and within one hundred yards of the site. From 1967 to 1972, the site was used for the stabling and pasturage of livestock. Later in 1972, the City of Quincy leased the landfill and redesignated the site as Quincy Municipal Landfill #2. Prior to1974, records of the types of materials received were not maintained, although liquids disposal and unsupervised dumping was known to occur. In 1974, EPA granted a permit for the development of 15 contiguous acres to be called Quincy Municipal Landfill #3. In 1978, the site was closed and a final cover was applied. From 1967 to 1978, the site received solid, hazardous, and liquid waste. In 1981, the City of Quincy acknowledged that the landfill had accepted unknown quantities of inorganics, solvents, heavy metals, mixed municipal wastes, and unknown wastes, and in 1982, the City of Quincy purchased the site. In 1983, EPA completed a preliminary assessment of the site that estimated that approximately 3,000 people were potentially affected by ground water contamination resulting from landfill contaminants migrating from the site. In 1984, EPA completed a site inspection that estimated that the site received approximately 343,000 gallons of sludge, 2,800,000 gallons of oily waste, 312,000 gallons of solvents, 343,200 gallons of organic and 180,000 gallons of inorganic chemicals, and 180,000 gallons of bases. A detailed topographic survey was performed by the City of Quincy, which included placement of an additional clay cap over leachate seeps, installation of new ground water monitoring wells, and approval of the City's erosion control proposal. In 1985, the State identified contamination in several adjacent residential wells and ordered the wells closed; and in 1986, the city extended the public water supply to the two affected residents. This ROD addresses a first and final remedy for the source contamination. The primary contaminants of concern affecting the groundwater and leachate are VOCs, including benzene and toluene; other organics, including PAHs; and metals, including arsenic and lead. SELECTED REMEDIAL ACTION: The selected remedial action for this site includes improving the landfill cap; collecting and treating leachate onsite using neutralization, metals precipitation, gravity separation, air stripping, and/or carbon adsorption, as determined during the RD phase; discharging of the treated leachate either onsite or offsite; providing a contingency for installation of a ground water pump and treat system to minimize contaminant migration; providing a public water supply for nearby affected residences, if ground water monitoring indicates that contamination exceeds compliance levels; monitoring leachate and ground water; installing surface engineering controls, including berms, lined ditches, and catch basins to direct surface infiltration away from known disposal areas; and implementing institutional controls, including deed restrictions, and site access restrictions, including fencing. The estimated present worth cost for this remedial action is $3,040,611, which includes an estimated annual O&M cost of $216,702. PERFORMANCE STANDARDS OR GOALS: Chemical-specific leachate cleanup goals are based on SDWA, MCLs, and include benzene 0.005 mg/l. INSTITUTIONAL CONTROLS: Deed restrictions will be implemented to prevent ground water use and building construction at the site.
Remedy:  The remedial action addresses two areas of concern--leachate and groundwater. The leachate remedial action addresses the source of the contamination by collecting and treating on-site waste. The function of this action is to control the landfill site as a source of groundwater contamination, to reduce the risks associated with exposure to contaminated materials, and to prevent untreated leachate from running off site. The groundwater remedial action involves long-term monitoring with cleanup levels. Failure to meet those cleanup levels will trigger remedial action.

The major components of the selected remedy include:
* Installation of a security fence around the landfill site;
* Deed restrictions to prohibit groundwater use and building construction on the site;
* Leachate collection, treatment, and monitoring;
* Installation of surface controls to reduce erosion;
* Landfill cap improvements to provide a minimum three feet of cover on the landfill;
* Provision of a public water supply to nearby residents;
* Groundwater monitoring;
* Groundwater containment and treatment if groundwater cleanup levels are not met and maintained.
Text:  View full-text ROD [ 58K ]
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