Waukegan Harbor Area of Concern Celebrates Another Milestone
In August, the Waukegan Harbor Area of Concern and Waukegan Harbor Citizens Advisory Group celebrated another milestone in environmental recovery following the clean-up of legacy pollutants in and around the harbor. The Degradation of Phytoplankton and Zooplankton Populations Beneficial Use Impairment was officially removed by the United States Environmental Protection Agency (USEPA) after years of monitoring by project partners. A beneficial use impairment, or BUI, is a human or ecological health hazard caused by changes in the chemical, biological, or physical integrity of a Great Lakes system. BUIs were designated as part of the Great Lakes Water Quality Agreement which established Areas of Concern throughout the Great Lakes in geographic areas that experienced extensive environmental degradation.
The Waukegan Harbor Area of Concern was designated as a result of contamination from long-lasting chemicals such as polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs), and heavy metals. This Area of Concern designation led to an increase in federal funding for clean-up and restoration of the site, and in 2013 environmental dredging of Waukegan Harbor was completed. Environmental dredging reduced PCB concentrations in harbor sediments well below the 0.2 parts per million (ppm) target set by the USEPA to be protective of human health, therefore reducing potential negative impacts of sediment contamination on the ecosystem.
Following the completion of environmental dredging, project partners including the Illinois Natural History Survey and the United States Geological Survey began monitoring plankton community response to the clean-up by surveying phytoplankton and zooplankton communities in Waukegan Harbor, non-impaired harbors throughout southwestern Lake Michigan, and nearshore Lake Michigan. The 2017 surveys also included water sampling throughout the Area of Concern and reference sites to analyze water toxicity. Results of the 2013, 2015, and 2017 plankton community surveys demonstrated no significant differences in zooplankton density or species richness between AOC and reference sites. In addition, the 2017 water toxicity tests demonstrated a lack of water toxicity throughout the AOC, reference sites, and nearshore Lake Michigan. The results of the water toxicity tests also showed no trend of poor reproduction in zooplankton in any of the water samples, leading researchers to conclude plankton and zooplankton populations within the AOC are no longer impaired.
The removal of the Degradation of Phytoplankton and Zooplankton BUI marks an important step in the environmental recovery of Waukegan harbor following aggressive clean-up and restoration activities. To date, efforts of multiple federal, state, and local partners have also resulted in the removal of four other BUIs: Beach Closings, Loss of Fish and Wildlife Habitat, Restriction on Dredging Activities, and Degradation of Benthic Invertebrates. Only one BUI remains, Restrictions on Fish and Wildlife Consumption, and CMP continuities to coordinate with IDNR Fisheries to monitor PCB levels in Waukegan Harbor fish to inform progress in the removal of that BUI.
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