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Record of Decision System (RODS)



City & State:  MUSKEGO  WI  53150
EPA ID:  WID000713180
EPA Region:  05
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-95/280
ROD Date:  02/02/1995
Operable Unit(s):  02
Media:  soil, groundwater
Contaminant:  Benzene, toluene, chloroform, trichloroethene, ethyl benzene, methylene chloride, vinyl chloride, tetrachloroethene, 1,2-dichloroethane, 1,1-d nickel, zinc, ketones, polynuclear aromatic hydrocarbons
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 Muskego Sanitary Landfill site occupies approximately 56 acres north of Stat Highway 24, and east of Crowbar Road in Muskego, Waukesha County, Wisconsin. Th site is located in Southeastern Wisconsin approximately 15 miles southwest of Milwaukee. More specifically the site is southwest of the urbanized portions of Muskego by roughly three miles. The site includes three areas known as the Old Fill Area, the Southeast Fill Area and the Non-Contiguous Fill Area. The site also includes wastewater ponds associated with a former rendering plant complex (Anamax plant). Portions of the property associated with the Anamax plant are also included in the Old Fill Area and Southeast Fill Area boundaries. Directly north of the site is the Stoneridge Landfill, a closed and covered solid waste landfill that is not part of the site. Land use to the west of the site is for sand and gravel excavation. To the south, east and north of the site, the land use is a combination of residential and agricultural. The area surrounding the site is semi-rural, but is zoned to permit further development. Several homes and businesses are in the vicinity of the property, and many more were once served by individual private water supply wells. In the late 1980s, city water mains were extended into the area and several homes and businesses were connected. Currently, two residences southeast of the site are not connected to public water.

The 38-acre Old Fill Area accepted material from the mid-1950s until 1977. An unknown amount of waste oils, paint products, and other wastes were deposited into the Old Fill Area during this time. The Southeast Fill Area, which covers about 16 acres, accepted only municipal wastes during its operation from 1977 to 1981. The Non-Contiguous Fill Area includes a drum trench, north and south refuse trenches, and an L-shaped fill area. This Non-Contiguous Fill Area occupies approximately four and two-tenths acres northeast of the Old Fill Area. Based on information from workers employed during operation of the landfill, the L-shaped Fill Area is expected to contain waste similar to that of the Old Fill Area.

In response to deteriorating water quality at on-site groundwater monitoring wells, sampling of off-site private water supply wells was conducted in 1982 and 1984. The results of the analyses indicated that several of the private wells may have been impacted by source of contamination, which could have been the landfill and/or the Anamax wastewater lagoons.

During the remedial investigation (RI), a trench was discovered in a portion of the Non-Contiguous Fill Area that contained a large concentration of 55-gallon drums. A total of 989 drums were excavated along with approximately 2,500 cubic yards of surrounding contaminated soil. The soils were excavated down to a dept of approximately 25 feet below the original surface elevation until groundwater was encountered.
Remedy:  The major components of the remedial action are as follows: monitor groundwater throughout the site; conduct a groundwater pumping test; install and operate groundwater extraction in the vicinity of the Non-Contiguous Fill Area; perform on-site treatment and discharge of extracted groundwater from the Non-Contiguous Fill Area; discharge treated water to an on-site infiltration basin in accordanc with state standards; dispose of treatment residuals to an approved disposal facility; monitor and evaluate the effectiveness of the groundwater extraction system in achieving progress toward cleanup standards, and expansion of the system if data on the performance of the system indicates that expansion is necessary to make progress toward cleanup standards.
Text:  View full-text ROD [ 89K ]
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