MOSS-AMERICAN CO., INC. (KERR-MCGEE OIL CO.)
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The Moss-American site comprises 88 acres including a former creosote facility and six miles of the Little Menomonee River, which is adjacent to the former facility. The Moss-American property is located at the intersection of Brown Deer and Granville Roads on Milwaukee's northwest side. About 65 acres are undeveloped Milwaukee County park land. About 23 acres are owned by the Union Pacific Railroad and are currently being used for industrial purposes.
From 1921 to 1976, Moss-American operated as a wood-preserving facility that treated railroad ties with a creosote and fuel-oil mixture. EPA environmental studies concluded that previous site activities contaminated soil and groundwater as well as sediment (mud) in the Little Menomonee River. Contaminants of concern include polycyclic aromatic hydrocarbons, or PAHs, and organic compounds such as benzene, toluene, ethyl benzene, and xylene.
What Has Been Done to Clean Up the Site?
In 2017, Wisconsin Department of Natural Resources completed excavating contaminated soil which was suspected to be the continuing source of on-site groundwater contamination. The excavated soil was transported to a landfill in Michigan that is licensed to accept hazardous waste. This work, which was done according to an official document called a “cooperative agreement” between EPA and WDNR, was a follow-up to EPA’s 2015 five-year review. The agreement also covers minor restoration planned for 2019 which includes removing invasive species, installing a gate, and recontouring disturbed areas. This will complete all planned work at the site.
The Little Menomonee River cleanup was completed in December 2009 which involved rerouting portions of the river as well as dredging contaminated sediment where rerouting wasn’t possible. The river project followed a 2002 cleanup of the Moss-American property. Since this was the source of the river's contamination, groundwater and soil were cleaned up first before moving on to the river.
EPA will continue to monitor the site through 2026 and then determine if it can be taken off the Superfund list.
What Is the Current Site Status?
EPA is conducting a five-year review of the Moss-American site. The Superfund law requires regular checkups of sites that have been cleaned up – with waste managed on-site – to make sure the cleanup continues to protect people and the environment. This is the fifth five-year review of this site.
More information is available at the Mill Road Library, 6431 N. 76th St., and on this web page under Site Documents & Data. The review should be completed by March 2020.
The five-year-review is an opportunity for you to tell EPA about site conditions and any concerns you have. Contact the community involvement coordinator or remedial project manager.