By Associated Press - Tuesday, June 16, 2015

SIOUX CITY, Iowa (AP) - Sioux City officials have confirmed that two workers at its wastewater treatment plant are no longer employed by the city.

Human Resources Director Bridey Hayes told KTIV-TV that superintendent Jay Niday and operations supervisor Pat Schwarte no longer work for the city. Hayes said she could not comment further about their departure.

Attempts to contact Niday by the Sioux City Journal weren’t immediately successful. An email seeking comment from Schwarte was left Tuesday.

It’s unclear if the employees’ departure is connected to an ongoing investigation by the Iowa Department of Natural Resources.

The agency is investigating whether an employee, who hasn’t been identified, changed chlorine levels in wastewater samples to meet standards outlined in a state-issued permit that allows treated wastewater to be discharged into the Missouri River.

City officials have said they are cooperating with the state and the U.S. Environmental Protection Agency. They said last week that they met with both agencies but didn’t disclose details of that meeting.

City Attorney Nicole Jensen said a complaint about the wastewater was sent to the city’s legal department. Jensen said the city is conducting an independent investigation and declined to comment about Niday’s departure.

Desiree McCaslen, a pretreatment manager with the Public Works Department, didn’t say whether the city has filled the position formerly held by Niday.

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