Hydrogen sulfide possible at Clendening Lake outlet

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TIPPECANOE — The Huntington District of the U.S. Army Corps of Engineers has determined conditions exist in the outlet works area at Clendening Lake that could result in the presence and possible release of hydrogen sulfide gases.

Hydrogen sulfide is a colorless gas that can be recognized by its “rotten egg” odor. Symptoms of exposure vary depending on the level and duration of exposure. Low concentrations irritate the eyes, nose, throat and respiratory system. Asthmatics may experience breathing difficulties. Exposure to moderate concentrations can also cause fatigue, dizziness, nausea and headaches. Young children are at particular risk.

This problem is normally confined to the area adjacent to the outlet works and is not known to pose a problem to recreational users of the lakes. There is no indication that fish taken from these lakes pose a health risk if consumed.

The corps will monitor hydrogen sulfide levels at the outlet works. Project employees will take readings to detect any presence of hydrogen sulfife gases around the outlet works and surrounding areas.

In the event that hydrogen sulfide gases at any public access site in these areas reach levels that could pose a health risk to the public, those areas will be closed. For public safety, the area adjacent to the discharge at Clendening Lake has been closed and will remain closed until the problem naturally corrects itself.

Hydrogen sulfide forms when the concentrations of sulfates in the watershed immediately behind these dams are higher than normal. During the summer months, the sulfates are converted to hydrogen sulfide gas through microbial activity occurring in the bottom layers of the lake. As the water leaves the lake, the hydrogen sulfide gas is released into the air, creating an unhealthy situation in the tailwater areas.

Corps personnel will continue to monitor the situation for the presence of hydrogen sulfide and will notify appropriate agencies as well as the public if concentration levels are determined to pose a threat to public safety.

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This article originally appeared on The Times-Reporter: Hydrogen sulfide possible at Clendening Lake outlet