Congressional District # 02
MADISON METROPOLITAN SEWERAGE DISTRICT LAGOONSEPA ID# WID078934403
Last Updated: May, 2015
The 183-acre Madison Metropolitan Sewerage District (MMSD) Lagoons Superfund site consists of two sludge lagoons that are located adjacent to the treatment plant facilities south of the city of Madison in Dane County, Wisconsin. Land use to the northwest of the sludge lagoons is both commercial and industrial, while to the west and southwest land use is primarily residential. Hunting occurs in the wetlands adjacent to the site and the lagoons are feeding areas for many species of waterfowl.
MMSD has operated the Nine Springs Wastewater Treatment Plant since 1933. In April 1970, a portion of the north dike of Lagoon 2 collapsed, and approximately 85 million gallons of lagoon contents were released into the adjacent ditch. A facilities plan, prepared during the mid-1970s, recommended reuse of the lagoon sludge by beneficially recycling the material to agricultural land. In 1982, analysis of a sludge sample from the lagoons first showed the presence of polychlorinated biphenyls (PCBs) at concentrations exceeding 50 parts per million (ppm).
Site ResponsibilityThe MMSD Lagoons site is being addressed through potentially responsible party (PRP) actions under state and federal oversight.
Threats and ContaminantsSludge in the MMSD lagoons is contaminated with PCBs and is a potential health concern to people living near the site. People working on the cropland where sludge was applied may be exposed to PCBs. Surface water in the old effluent channel is tainted from the PCB-contaminated sludge.
Under an administrative order on consent (AOC), issued by EPA on September 24, 1992, MMSD completed a remedial investigation/feasibility study (RI/FS) at the site. A record of decision (ROD) was signed on March 31, 1997 that selected a remedy to reduce risk of exposure to sludges with PCB concentrations greater than 50 ppm for ecological receptors. Design was carried out by the potentially responsible parties (PRPs) under the September 24, 1992 AOC and was completed in December 1997.
A consent decree (CD) for remedial action (RA) was signed in December 1997. Cleanup work began in January 1998 and included construction of a soil and fabric cover for the lagoons and new dike construction. Sludges in these lagoons with PCB concentration less than 50 ppm will be used in the MMSD agricultural program. The preliminary close-out report (PCOR), documenting the construction completion of the remedy, was completed in September 2001.
EPA completed the first five-year review (FYR) at the site in March 2003 and the second FYR in March 2008. Each report found that the remedy remained protective and was functioning as designed. Institutional controls (ICs) were in place but needed to be reviewed for effectiveness.
EPA completed the third FYR at the site in March 2013 and with a supplement in September 2013. The report found that the remedy remained protective and was functioning as designed. ICs are in place and EPA is reviewing the Institutional Control Plan for effectiveness.
ContactsRemedial Project Manager, U.S. EPA
thomas smith (firstname.lastname@example.org)
Community Involvement Coordinator, U.S. EPA
AliasesMADISON METRO SEWAGE SLUDGE LAGOON
MADISON METROPOLITAN SEWERAGE DIST LAGON
MMSD SLUDGE LAGOON
MADISON METROPOLITAN SEWERAGE DISTRICT