December 24, 2020 Update

During routine water sampling at one of our Midwest Plant outfalls, we detected a slightly elevated level of cyanide. The sample was taken on 12/20 and the results from a third party laboratory were received on 12/24.  The result was 0.017 mg/L verses a permit limit of 0.013 mg/L. This concentration is significantly below the drinking water standard of .20 mg/L, and there is no expected threat to public drinking water. Samples taken on 12/19 and daily testing since 12/20 have been non-detectable for cyanide. Our Midwest Plant does not utilize or produce cyanide. We continue to investigate this anomaly and have notified relevant local and state agencies and other stakeholders.

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U. S. Steel Reports Exceedance at Midwest Plant

At approximately 4:50 p.m. on October 30, 2019, we were notified of an exceedance of our National Pollutant Discharge Elimination System (NPDES) permit limit for hexavalent chromium. Elevated results were detected at an internal outfall at our Midwest Plant in Portage, Indiana during routine, daily sampling. We were notified that an initial sample result was over the limit for hexavalent chromium, which is 0.51 lbs.

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