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Record of Decision System (RODS)



Site Name:  HAGEN FARM
City & State:  STOUGHTON  WI  53589
County:  DANE
EPA ID:  WID980610059
EPA Region:  05
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-92/216
ROD Date:  09/30/1992
Operable Unit(s):  02
Media:  Ground Water
Contaminant:  VOCs Metals
Abstract:  SITE HISTORY/DESCRIPTION: The Hagen Farm site is a former waste disposal facility approximately 1 mile east of the City of Stoughton, Dane County, Wisconsin. The site is defined as the area within the property boundary and the contaminant plume. The property is approximately 28 acres in size, and within the property boundary is a 10-acre area that was used for waste disposal. The site is located in a rural area that is largely dominated by sand and gravel mining and agricultural activities. Eleven private wells are located within 1,000 to 4,000 feet of the site. In addition, a wetland area is located adjacent to and just south of the site. Prior to the 1950's, the site was operated as a sand and gravel pit. The gravel pit was then used for disposal of waste materials from the late 1950's to the mid-1960's. Waste materials were disposed of in three onsite subareas designated A, B, and C. Waste materials included municipal and industrial wastes, such as solvents and other various organic materials. From 1980 to 1986, state investigations revealed organic compounds in nearby private water supply wells. A 1990 ROD addressed contaminated soil in the three disposal areas as OU1 and provided for excavation of soil in subareas B and C with consolidation in disposal area A; construction of a landfill cover at disposal area A; and implementation of a soil vapor extraction system in sub-waste soil under disposal area A. This ROD provides a final remedy for the ground water control on the property and off the property, as OU2. The ROD defines on-property ground water as contaminated ground water in the immediate vicinity of the main disposal area and off-property groundwater at any location within the plume other than in the area defined as on- property ground water. The primary contaminants of concern affecting the ground water are VOCs, including 1,1-dichloroethene, ethylbenzene, benzene, tetrahydrofuran, toluene, vinyl chloride, and xylenes; and metals, including arsenic and lead. PERFORMANCE STANDARDS OR GOALS: Chemical-specific ground water clean-up goals are based on the State of Wisconsin Preventive Action Limits (PALs) and include benzene 0.067 ug/l; 1,1-dichloroethene 0.024 ug/l; ethylbenzene 272 ug/l; tetrahydrofuran 10 ug/l; toluene 68.6 ug/l; vinyl chloride 0.0015 ug/l; xylenes 124 ug/l; arsenic 5 ug/l; and lead 5 ug/l. INSTITUTIONAL CONTROLS: Institutional controls, including deed restrictions, will be implemented to prevent use of the land or ground water and to safeguard human health and the environment during remedial activities.
Remedy:  SELECTED REMEDIAL ACTION: The selected remedial action for this site includes extracting and pretreating on- and off-property ground water to remove metals and inorganic solids; treating on-property ground water using an activated biological sludge treatment system; treating off-property ground water using a treatmenttechnology to be determined during the remedial design stage; discharging the treated ground water onsite to the wetlands, surface water, or possibly reinjecting the treated water into theaquifer to promote in situ biodegradation, based on the results of a bench- scale study; treating sludge generated from the treatment process, prior to disposal in a RCRA landfill; treating off-gases emissions from the treatment process using carbon adsorption, with regeneration or treatment of the spent carbon; monitoring private wells located around the site; implementing institutional controls including deed restrictions, and access restrictions. The estimated present worth cost for this remedial action (depending on the treatment selected for the off-property ground water) ranges from $13,612,000 to $24,163,000, which includes an annual O&M cost ranging from $550,000 to $1,062,000 for the first year.
Text:  View full-text ROD [ 56K ]
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