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Record of Decision System (RODS)



Address:  ROUTE 56 
City & State:  WARRENVILLE  IL  60555
County:  DUPAGE
EPA ID:  ILD980606305
EPA Region:  05
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/541/R-98/092
ROD Date:  09/30/1998
Operable Unit(s):  01
Media:  Groundwater, Leachate, Other, Sediment, Soil, Surface Water
Contaminant:  Acids, Base Neutral Acids, Inorganics, Metals, PAH, PCBs, Pesticides, Petroleum Hydrocarbon, VOC
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.

The DuPage County Landfill/Blackwell Forest Preserve Site is located approximately 6 miles southwest of downtown Wheaton, near Warrenville, in DuPage County, Illinois. The site is an approximately 40-acre landfill centrally located within the approximately 1200-acre Blackwell Forest Preserve. The Forest Preserve is open space containing woodlands, grasslands, wetlands and lakes used by the public for recreational uses such as hiking, camping, boating, fishing and horseback riding.

The landfill is located within the Spring Brook watershed of the West Branch of the DuPage River drainage basin. From Spring Brook, surface water drains to the West Branch of the DuPage River and, ultimately, to the Des Plaines River. There are a number of private wells east of the site. Trace concentrations (several orders of magnitude below regulatory levels) of volatile organic compounds (VOCs) were detected in private wells east of Spring Brook.

The 40-acre tract of land that is now the landfill was originally purchased by the Forest Preserve District (FPD) in 1960. The surrounding 1,100 acres were purchased during the next five years. In 1963 gravel excavations were ongoing at the pit and continued through July 1969. Concurrent with the gravel mining operation, the nearby lakes were enlarged and deepened. The FPD began development of the landfill in its present location. Approximately 1.5 million cubic yards of waste were deposited in the landfill between 1965 and 1973, creating Mt. Hoy which is approximately 150 feet above the original ground surface.

In 1969, the first leachate well was installed to monitor the amount and types of liquids contained in the landfill and in 1970, ten monitoring/piezometer wells were installed surrounding the landfill. Measurement of groundwater levels and samples for pH and chloride were taken. The last load of public refuse was accepted in 1973. The picnic and camping areas, hiking trails, swim lake and Mt. Hoy opened at the preserve in 1976. In 1980, leachate was observed seeping from the north slope of the landfill. Twenty three wells were installed to monitor groundwater, and two geologic studies were completed. Due to concerns about the accumulation of landfill gases, ten shallow gas vents and six deep gas vents were installed in 1982. A groundwater/surface water sampling program began in 1983, while 20 additional monitoring wells were installed and added to the routine sampling program in 1984-1986.

The FPD agreed to conduct a Remedial Investigation (RI) and a Feasibility Study (FS) at the site in 1989. After the inclusion of the site on the National Priorities List (NPL) in 1990, the FPD entered into an Administrative Order on Consent (AOC) to complete several components of the required design and cleanup of the site under removal authority. After several remedial efforts, the final cap improvements were completed in 1998.
Remedy:  The selected remedy for the final remediation of the DuPage County Landfill includes long-term institutional controls (deed restrictions, erosion/flood control), long-term operation and maintenance of the improved landfill cap, long-term leachate extraction with possible augmentation of nine additional wells, long-term off-site leachate treatment and disposal, long-term passive landfill gas collection with possible augmentation to active gas collection and on-site thermal treatment, monitored natural attenuation for groundwater, and long-term groundwater, leachate, and landfill gas monitoring.

Estimated Capital Costs: $290,000
Estimated Annual O & M Costs: $399,000
Estimated Present Worth Costs (7%): $5,819,000
Estimated Present Worth Costs (3%): $8,577,000
Estimated Total Monitored Natural Attenuation Costs: $80,000
Text:  View full-text ROD [ 118K ]
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