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Record of Decision System (RODS)



City & State:  WILLIAMSTOWN  WI  53032
County:  DODGE
EPA ID:  WID052906088
EPA Region:  05
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-95/279
ROD Date:  09/06/1995
Operable Unit(s):  02
Media:  groundwater
Contaminant:  Clay cap, gas extraction
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 Hechimovich Sanitary Landfill, now known as the Land and Gas Reclamation Landfill (LGRL), does not include the active landfill (the new Hechimovich Sanitary Landfill) which is located immediately to the north of the closed LGRL. The new landfill meets current state design and operation requirements and is licensed to accept only nonhazardous waste. The site does not include a licensed demolition debris landfill directly west of the LGRL.

The LGRL site is located in a rural area in Williamstown, approximately 2 miles south of Mayville and approximately 3 « miles east of Horicon, Wisconsin. This 24 3/10 acre closed landfill is unfenced and access is not controlled.

The area surrounding the site is primarily agricultural land with low density residential development. Horicon Wildlife Area, a major migratory bird habitat, is approximately 2 1/2 miles west of the site.

The LGRL was a licensed landfill, operated by Mayville from 1959 to 1970 and then privately operated from 1970 to October 1986, when it ceased accepting waste. The Mayville landfill was a small open dump that now is part of the northern end of the closed landfill. A variety of waste disposal activities occurred at the Mayville site including open burning, battery recycling operations and solvent disposal. It appears these past activities are a significant contributor to the current groundwater problems, as the highest groundwater contamination levels are directly down gradient and adjacent to the old dump site.

Beginning in 1970, the site was operated by George Hechimovich and the site was then called the Hechimovich Sanitary Landfill. The Mayville site was sold to and became part of the Hechimovich Sanitary Landfill in 1971. In March 1984, site ownership and operations were transferred to Land and Gas Reclamation, Inc., and the site name was subsequently changed to LGRL in July 1985. The site was closed in October 1986.

During part of the 1970-1986 time period, the site was licensed to accept hazardous waste. Paint sludges and cutting oils from local industries, possibly containing lead, chromium, and solvents, were disposed of in several lagoons on site. It is estimated that 53,000 gallons of liquid hazardous waste were disposed of at this site. In addition, the site accepted approximately 1 million cubic yards of nonhazardous household and commercial wastes. The landfill does not have a liner. An initial cover, consisting of 2-4 feet of local till soils and 6 inches of topsoil, was put in place in 1987. A system of groundwater and surface water monitoring locations were included in a monitoring program required at site closure.

In July 1987, the LGRL site was subject of a state enforcement action which directed that actions be taken at the landfill. These actions included the installation of a clay cap and a gas collection system. The court-ordered clay cap was installed. In addition, an active gas extraction system has been operating according to design specifications. The enhancement of this gas extraction system is the main activity in the final remedy for the site.
Remedy:  The final remedial action for this site consists of the existing clay cap and, if necessary, an expansion of the current operating gas extraction system. The cap and gas extraction system installed in 1992 as an interim source control measure form the backbone of the final remedial action. The additional actions proposed in the ROD will increase the landfill gas extraction rate. The increased gas extraction rate will be accomplished either by adding additional gas extraction wells in the waste or by increasing the gas flow rate through the existing well system. The intent will be to, as rapidly as possible, reduce the volatile organic compound (VOC) concentration in the landfill wastes and consequently reduce the VOC loading from the landfill to groundwater. The reduced loading, in conjunction with the natural attenuation processes already occurring in the groundwater, should reduce the existing groundwater contamination levels at a satisfactory rate. Groundwater monitoring will be required to track improvement in water quality.
Text:  View full-text ROD [ 73K ]
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