(CBS DETROIT) – The city of Ann Arbor is conducting sampling after dried sewage and debris was found near an Ann Arbor elementary school Wednesday afternoon, officials said. 

The sewage was found behind Pittsfield Elementary School at a sanitary sewer manhole located in a grassy area near a city-owned manhole. 

The city investigated the situation and couldn’t find what had caused the surcharge. The grassy area was cleaned and public works staff used lime to neutralize any contamination.

“An estimated 75 gallons of raw sewage was released to the grassy area, ultimately flowing to the storm drain, which flows and daylights to Swift Run – near Whitewood and Norwood streets,” city officials said. “This area is currently under evaluation for improvements as part of the design work for a Capital Improvement Project in the Pittsfield Village area to begin in 2025.”

Officials are working with the Washtenaw County Health Department to conduct upstream and downstream sampling for the presence of E. coli. They also alerted the Michigan Department of Environment, Great Lakes and Energy about the incident. 

Because Swift Run flows into the Huron River, the city put up signs recommending that boaters stay upstream from South Pond for the next two days.

(CBS DETROIT) – The Oakland County Sheriff’s Office is investigating two separate incidents at North Commerce Lake and Union Lake.

According to the sheriff’s office, the Search and Rescue Team responded to North Commerce Lake at about 5:57 p.m. for a man who was unresponsive and floating in the water.

Authorities say the 20-year-old Commerce Township man was on a pontoon boat near a sand bar in the lake when he dove off and hit his head on the lake bottom, about 4 feet underwater. The man, who was not wearing a life jacket, was taken to a hospital for serious injuries.

Investigators believe alcohol was a factor.

At about 5:43 p.m., the sheriff’s office said a 32-year-old Waterford Township man was on a personal watercraft when he fell off. The watercraft continued for a distance before hitting a 24-foot pontoon boat.

Authorities say a 29-year-old woman was lying on her back at the teat of the boat when it was struck. She suffered minor injuries and refused treatment at the site.

Alcohol does not appear to be a factor.