copyright the Chronicle May 24, 2017
by Joseph Gresser
NEWPORT — Lake Memphremagog has a phosphorus problem and the state Department of Environmental Conservation (DEC) has a plan to fix it. Actually, the plan is still in draft form, and Watershed Coordinator Ben Copans is touring the Kingdom looking for comments on the DEC’s proposal.
His first meeting on a three-stop tour of the Memphremagog watershed was in Newport where, in a meeting room overlooking the lake Monday, he outlined some of the measures called for by the plan. Mr. Copans will take his presentation to Brighton on May 30, and Craftsbury on May 31.
The federal Clean Water Act requires states to set a total maximum daily load, Mr. Copans said. That’s the limit on how much phosphorus can flow into a lake from its watershed while it still meets water quality standards.
Mr. Copans said the U.S. end of Lake Memphremagog has phosphorus levels that are 20 percent higher than the 14 parts per billion standard set for the lake. Currently the levels in Vermont’s portion of the lake average around 17.6 parts per billion, but rise and fall during the year.
The Canadian portion of the lake is about three-quarters of Memphremagog’s surface area, although much more than half the lake’s watershed is in Vermont.
Officials from the two nations meet in the Quebec Vermont Steering Committee on Lake Memphremagog and are working together to reduce the nutrient load coming from both the state and the province, Mr. Copans said.
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