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Record of Decision System (RODS)



City & State:  FOND DU LAC COUNTY  WI  54971
County:  FOND DU LAC
EPA ID:  WID980610190
EPA Region:  05
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-96/296
ROD Date:  03/27/1996
Operable Unit(s):  01
Media:  groundwater
Contaminant:  VOCs, vinyl chloride, TCE, PCE, benzene
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 Ripon Landfill is located in western Fond du Lac County, about 2 miles northwest of the City of Ripon, WI. The landfill is 7 1/3 acres in size and has a volume of approximately 180,000 cubic yards of waste.

Landfilling occurred between 1967 and 1983. Various entities operated at the site over the years, although Ripon was responsible for operations during much of the life of the landfill. The landfill accepted commercial, industrial and residential waste, including approximately three million gallons of municipal wastewater treatment plant sludge.

Between 1985 and 1992, the site was used to grow hay. Since 1992, the land has been planted in a grass cover. Agricultural crops are still grown on a property just east of the site. The site is fenced, but vehicle access is possible at two locations from the highways into the landfill. Across the highway to the west of the site is a sand and gravel quarry.

In 1967, Speed Queen Corporation leased the property for disposal of industrial wastes from its facility in Ripon. In 1968, the City of Ripon leased the property. The site accepted wastes between 1967 and 1983. The site was capped in 1985 with a clay cap. Vegetation was established to minimize erosion. A gas venting system (trench with gooseneck vents) was placed in a north-south orientation along the western edge of the landfill.

A private residence is located approximately 350 feet south of the landfill. The water supply well to this home was monitored for VOCs in 1984 and a couple of VOCs were detected, including vinyl chloride. Subsequent sampling of the well confirmed the presence of vinyl chloride. A replacement well was drilled for this household. Sampling of the replacement well also confirmed the presence of vinyl chloride. The well was abandoned in 1990. No water supply well exists on the property and nobody is currently living in the home.

A total of eight volatile organic compounds (VOCs) were detected in groundwater monitoring wells. Two metals, iron and manganese, were detected in samples. Arsenic and cadmium were also detected. These metal concentrations are likely due to the natural geology of the glacial deposits and the landfill doesn't appear to be contributing significant quantities of metals to the groundwater.

Contaminated groundwater exists from under the landfill and extends to the south and southwest of the landfill. The discharge point for this contaminated groundwater is the wetland located southwest of the site. The highest concentrations of VOCs are present along the southern edge of the landfill. Concentrations of VOCs in groundwater entering the wetland are low enough so as to not cause a problem to the wetland.
Remedy:  The components of the source control remedial action include: constructing a composite landfill cover over the entire landfill; installing a passive landfill gas venting system as part of the composite cap to effectively vent landfill gas from the waste; monitoring of the groundwater quality to determine the effectiveness of the landfill cap towards improving groundwater quality; monitoring of the landfill gas probes around the landfill to make sure that landfill gas is not migrating away from the site in an uncontrolled manner; maintenance of the landfill cap to repair erosion that may develop; a deed restriction prohibiting disturbing the landfill cap except for maintenance purposes; and fencing of the landfill perimeter to restrict access.

For the groundwater operable unit, no further action has been selected. The groundwater contamination that has migrated from this landfill is not severe enough to warrant active groundwater remedial measures to restore groundwater quality. The implementation of the source control operable unit remedy will result in decreased migration of contaminants from the landfill to the groundwater.
Text:  View full-text ROD [ 41K ]
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