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Areas of Concern: Benthos Toxicity at Wisconsin s AOCs Science Center Objects USGS is assessing sediment toxicity at Wisconsin s Sheboygan River and Milwaukee Estuary areas of concern (AOCs) on Lake Michigan. The study will assess if sediment toxicity from polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs), selected metals, ammonia, or low dissolved oxygen is present at either acutely toxic or chronically toxic concentrations. Sediment toxicity tests are being conducted with amphipods and midges. This study helps address concerns regarding sediment toxicity, and it will inform management decisions regarding the Beneficial Use Impairment (BUI) for Degraded Benthos, which must be removed prior to delisting the AOCs. ....