Jefferson City, Mo. — Tyson Foods has agreed with the state of Missouri to a half-million dollar settlement over a massive fish kill Tyson caused last May by releasing ammonia-contaminated wastewater in Clear Creek in Barry County. Missouri brought suit against Tyson last June. The state says the Tyson Foods facility at Monett discharged wastewater containing a highly acidic animal feed supplement into the city of Monett’s sewer system, causing the city’s biological wastewater treatment system to fail and water containing a high level of ammonia to flow into Clear Creek and killing at least 100,000 fish. Tyson will pay the state of Missouri $162,898 for natural resource damages and $110,000 in civil penalties, and will reimburse costs and expenses to the Missouri Department of Natural Resources of more than $11,000 and the Missouri Department of Conservation more than $36,000. The agreement also outlines additional obligations of Tyson, including preparation of a hazardous waste manifest before transporting any hazardous waste in Missouri, and allows the state the right to inspect the Monett and Aurora facilities at any time to check for compliance with the law and to monitor the progress of all activities required in the agreement.