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State explains plans for Lake Memphremagog

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copyright the Chronicle November 15, 2017


by Joseph Gresser


NEWPORT — While the federal and state governments have been making a great deal of fuss over Lake Champlain in recent years, Lake Memphremagog has received far less attention.

At a Tuesday meeting at the East Side Restaurant on the lake’s shore, Watershed Coordinator Ben Copans shared Vermont’s plans to cut the amount of phosphorus in Memphremagog.

Mr. Copans, who works for the Department of Environmental Conservation, told a group of around 40 people that the lake is suffering some of the harmful effects of excess phosphorus, including occasional algae blooms caused by more nutrients in the water.

Ideally, the lake would have no more than 14 parts per billion of phosphorus. At present it averages 17 parts per billion, Mr. Copans said.

During the 1980s the lake’s phosphorus levels soared to as many as 30 parts per billion, according to a chart Mr. Copans showed his listeners.

“Things improved after the city improved its water treatment facility,” he said.

The chart showed levels dropping to 14 parts per billion for a few years after the renovated sewage plant was put into operation, but they have risen since then to their current level.

Most of the lake is in Canada, but the vast majority of its watershed is in Vermont, Mr. Copans said. While Vermont and Canadian officials are working together to limit the amount of phosphorus getting into the lake, the northern portion of the lake is in compliance with the 14 parts per billion limit.

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