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Record of Decision System (RODS)

TOMAH MUNICIPAL SANITARY LANDFILL

Abstract

Site Name:  TOMAH MUNICIPAL SANITARY LANDFILL
Address:  WEST 24TH AVENUE 
City & State:  TOMAH  WI  54660
County:  MONROE
 
EPA ID:  WID980610307
EPA Region:  05
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/541/R-97/098
ROD Date:  09/25/1997
Operable Unit(s):  01
 
Media:  Groundwater.
 
Contaminant:  Chloroethane, 1,1-dichloroethane, 1,2-dichloroethene, 1,2-dichloropropane, 1,2-dichloroethane, vinyl chloride, benzene, toluene, ethylbenzene, xylenes, chlorobenzene, aluminum, iron, manganese, thallium, cadmium, chromium, endrin, chlordane.
 
Abstract:  The Tomah Municipal Sanitary Landfill (TMSL) is located north of the City of Tomah, Wisconsin. The landfill occupies approximately 18 acres within the 40-acre site. The site is bordered on the north by Deer Creek and its associated wetlands, on the east by 24th Avenue and agricultural property, on the south by the Sunnyvale Subdivision, and on the west by agricultural fields and wetlands. The City of Tomah operated TMSL as a disposal site from 1959 to 1979, disposing of municipal and industrial wastes on 18 acres located on the southern portion of the site. Wastes were placed in shallow unlined trenches. The city closed the site in 1979, covered it with soil and topsoil, and planted grass and trees on the site. In 1983, an assessment was done on the site that indicated that the landfill represented a potential hazard to groundwater and surface water, and that there could be other migration pathways. Sampling took place on site in 1992 that found elevated levels of vinyl chloride. Subsequently, residents of the local subdivision were provided with municipal water and their private wells were abandoned. In 1994, in an effort to prevent further contamination of any media, the site was contained using a landfill cap, a groundwater collection and treatment system, a landfill gas collection and treatment system, a leachate collection and treatment system, and future land use restrictions. In 1996, an active gas extraction system was installed as an addition to the containment system.
 
Remedy:  The selected remedy for this operable unit addresses the source of groundwater contamination. The major components of the remedy include: capping the approximately 18-acre landfill with a dual barrier cap that includes a geosynthetic clay liner, overlain by a low-permeability geomembrane, and covered with 3 feet of soil and vegetated with plants that have a root system less than 3 feet; expansion of an already existing active gas collection system: and conducting environmental monitoring to ensure the effectiveness of the remedy.
 
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