The 124 million gallons of sewage dumped into Lake St. Clair in March was chemically treated and presents no danger to the public, according to the state Department of Environmental Quality.

An environmental group, Save Lake St. Clair, had scrutinized DEQ documentation and declared that the four discharges from the Martin retention basin in St. Clair Shores consisted of raw sewage. But a DEQ official said the labeling of the discharge contents is admittedly misleading to the public.

“It isn’t an untreated wastewater discharge. Right now … there’s not a category that fits it to a T,” said Dan Beauchamp, an acting district supervisor for the DEQ.

The department’s online information refers to the Martin sewage discharges as a sewage system overflow, an SSO, which typically refers to raw sewage. The DEQ added footnotes to its website chart to indicate that the outflow consisted of “partially treated sewage.”

The Martin basin, located by the shoreline of Lake St. Clair, is in a technical category by itself because of the ratio of sewage vs. rainwater that it takes in during storms. As a result, Beauchamp said, its secondary treatment process, which includes a sanitizing system to kill E.coli bacteria, is fairly unique.

The massive basin is operated by the Macomb County Public Works Commissioner’s Office and the Martin operations manager has been trying to reach a resolution with the DEQ for a few years.

“It’s been something of a point of contention, and something that’s under negotiation,” said Brent Avery. “These are not SSOs. The DEQ is having trouble with the language. They’re dragging their feet.”

Martin’s state operating permit is up for renewal later this year and the confusion may be ironed out by then. Beauchamp explained that, in the south Macomb area handled by Martin, about 85 percent of the homes and businesses have separated sewer lines – one for sewage and one for rainwater. The other 15 percent have combined sewer pipes that handle both.

Avery argues that Martin should be classified as a combined sewer overflow facility — not an SSO site — just like the Chapaton retention basin that his department operates just a few miles away, also on the Lake St. Clair shoreline in St. Clair Shores. The treatment process for discharges at Martin, Avery asserted, remains superior to those at Chapaton and at most sewage basins in southeast Michigan.

Beuchamp said that both facilities have passed a water quality evaluation test – most recently in 2007 at Martin – and both meet DEQ treatment standards.

 

Photo/Flickr/Mike Boening