Enbridge operates a pipeline across Boone County and h is building a new pumping station on Marengo Road to nearly double the flow in the current pipeline. This article is over one year old and is published by an environmental magazine.
….Both the EPA and the Michigan Department of Environmental Quality (MDEQ) give the river a generally clean bill of health. But the EPA's Ralph Dollhopf, who has supervised the cleanup for the last three years, says, "We know we are not going to get all of the oil out."
The EPA has ordered Enbridge to dredge parts of the river and remove as much of the remaining oil as possible. Enbridge says it will comply, although it disputes the EPA's estimates, saying no more than 25,000 gallons of oil remain.
"You can look at the river and say it looks good but there are so many things that fly under the radar—those are the things that we will be monitoring for years," said Michelle DeLong, who is leading the MDEQ's response to the spill.
In the largest study in its history, the MDEQ has collected more than 5,000 soil and groundwater samples to determine if they contain heavy metals, including nickel, beryllium, molybdenum and vanadium, which are toxic at high doses. Heavy metals are found in all types of oil but are most prevalent in bitumen. Some, like arsenic and lead, can damage the nervous system even at relatively low doses.
It will be a year or more before all the samples are analyzed and conclusions can be reached, said Mark Ducharme, senior environmental analyst for MDEQ. Most of the preliminary tests reveal nothing alarming, although a few locations show elevated concentrations of heavy metals and chemicals.
The MDEQ also is considering a proposal by Enbridge and the EPA to tear down the century-old Ceresco Dam, where much of the remaining oil has settled.
The dam once supplied water to a small hydroelectric plant that closed more than 50 years ago. Removing it would return that section of the Kalamazoo to its natural, free-flowing state. It also would reduce the amount of dredging needed, because the oil-soaked sediment would dry when the water level drops and could be scooped up and hauled away.
But some local residents are suspicious of anything Enbridge wants to do and are asking for more information.
Read the entire article: The Dilbit Disaster 3 Years Later: Sunken Oil Is Looming Threat to Kalamazoo River | InsideClimate News
