U.S. EPA REGION 5
Congressional District # 02
MADISON METROPOLITAN SEWERAGE DISTRICT LAGOONSEPA ID# WID078934403
Last Updated: December, 2011
Site DescriptionThe Madison Metropolitan Sewerage District (MMSD) Lagoons site consists of two sludge lagoons, totaling 183 acres, 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. 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 ResponsibilityThis site is being addressed through federal and potentially responsible parties' actions.
Threats and ContaminantsThe sludge in the lagoons is contaminated with polychlorinated biphenyls (PCBs) and is a potential health concern to people living near the site. People working on the cropland where sludge is applied may be exposed to PCBs. Surface water in the old effluent channel is tainted from the PCB-contaminated sludge. Hunting occurs in the wetlands adjacent to the site. The lagoons are feeding areas for many species of waterfowl.
Cleanup ProgressUnder an administrative order on consent (AOC), issued by U.S. EPA on September 24, 1992, MMSD completed a remedial investigation/feasibility study (RI/FS) for 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. Construction 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. The first five-year review of the site was completed in March 2003. The second five-year review was completed March 2008. The five-year review found that the remedy remains protective and is functioning as designed. Institutional Controls are in place and the Institutional Control Plan is being reviewed for effectiveness. The next five-year review will be completed in 2013.
ContactsRemedial Project Manager, U.S. EPA
david linnear (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