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Record of Decision System (RODS)

MUSKEGO SANITARY LANDFILL

Abstract

Site Name:  MUSKEGO SANITARY LANDFILL
Address:  HIGHWAY 24 & CROWBAR ROAD 
City & State:  MUSKEGO  WI  53150
County:  WAUKESHA
 
EPA ID:  WID000713180
EPA Region:  05
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-92/204
ROD Date:  06/12/1992
Operable Unit(s):  01
 
Media:  Soil, Sediment
 
Contaminant:  VOCs, Other Organics
 
Abstract:  SITE HISTORY/DESCRIPTION: The 56-acre Muskego Sanitary Landfill site is located in the City of Muskego, Waukesha County, Wisconsin. Land use in the area is predominantly residential and agricultural, with wetlandareas located in the nearby vicinity. All of the site lies within the 100- year floodplain. The upper glacial drift aquifer, one of three principal sources of ground water in Waukesha County, is used for human consumption. From the 1950's to 1981, municipal waste, waste oils, paint products, and other wastes were disposed of at the site. The site is separated into three disposal areas: the Old Fill Area (38 acres); the Southeast Fill Area (16 acres); and the Non-Contiguous Fill Area (4.2 acres), composed of a drum trench, north and south refuse trenches, and an L-shaped fill area, all containing waste similar to the Old Fill Area. As a result ofdeteriorating water quality at onsite ground water monitoring wells, Waste Management of Wisconsin Inc. (WMWI) and the state conducted numerous investigations that revealed elevated levels of contaminants in the ground water. In 1985, WMWI installed a methane extraction system to alleviate the gas migration along the western portion of the Old Fill Area. In 1986, public water was supplied to the site and private wells in the area. Two separate areas at the site were discovered to contain buried drums and contaminated soil. The first area was located east of the Non-Contiguous Fill Area. The secondarea, known as the drum trench, was discovered in a portion of the Non- Contiguous Fill Area and contained 989 drums and 2,500 cubic yards of contaminated soil. In 1991, the drums and soil from both areas were disposed of offsite at appropriate hazardous waste disposal facilities. Liquid wastes and drums were also sent offsite for incineration. This interim ROD addresses the control and remediation of the contamination sources, including landfill waste, contaminated soils, leachate, and landfill gas. Future RODs will address the control and remediation of the contamination in the ground water aquifer as a separate operable unit. The primary contaminants of concern affecting the soil and sediment are VOCs, including benzene, TCE, toluene, and xylenes; and other organics, including PAHs, PCBs, pesticides, and phenols. PERFORMANCE STANDARDS OR GOALS: A performance based clean-up standard will be applied to the area covered by the ISVE system in the Non-Contiguous Fill Area. The clean-up standard will be based on residual soil gas concentrations that are low enough to assure compliance with ground water clean-up standards, which will be specified in the subsequent ROD for the contaminated ground water. INSTITUTIONAL CONTROLS: Institutional controls including deed restrictions will be implemented to prevent access, excavation, and disturbance of the cap and installation of the wells.
 
Remedy:  SELECTED REMEDIAL ACTION: The selected remedial action for this site includes installing a cap over the Old and Southeast Fill Areas; adding a landfill leachate control system at the Old Fill Area and improving the existing leachate control system at the Southeast Fill Area; discharging the collected leachate onsite to the sewer if pretreatment requirements are met, or treating leachate along with contaminated ground water as part of the subsequent OU; managing sludge residuals from the treatment processes as a hazardous waste, if it exhibits the characteristic of toxicity; capping of the Non-Contiguous Fill Area; treating soil within the drum trench and north and south refuse areas using in-situ vapor extraction to remove VOCs; treating the extracted gas using either activated carbon or thermal destruction with catalytic oxidation, or another treatment method prior to emission to the atmosphere; utilizing an active gas control system, in conjunction with the leachate collection system at both the Old and Southeast Fill Areas to destroy extracted gases with a ground flare; and conducting semi-annual ground water monitoring and implementing institutional controls including deed restrictions and site access restrictions including fencing. The estimated present net worth cost for this remedial action is $9,914,000, which includes an annual O&M cost of $309,500 for years 0-5, and $134,200 for years 6-30.
 
Text:  View full-text ROD [ 63K ]
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