Twin Island Lake cleanup garners some support and some concerns

PINE PLAINS — The Town Board is pondering how to best address the invasion of Eurasian watermilfoil at Twin Island Lake. The weed has slowly taken over much of the lake and it is feared it will completely dominate the waterway if it is not managed.

In March the board was presented with information about applying a chemical called Renovate 3 (active ingredient triclopyr), which is supposed to attack the milfoil and not much else, according to Carter Gregory of the Twin Island Lake Association. It was Gregory who made last month’s presentation before the board. Gregory provided research from Aquatic Control Technology, Inc., which has done a survey of the lake and would be the one to apply the Renovate 3. Aquatic Control Technology has been in touch with the New York State Department of Environmental Conservation (NYSDEC), although it has not received all of the needed permits. The Massachusetts company recommended that a 36-inch diameter culvert pipe between Twin Island Lake and Stissing Lake be partially blocked off by roughly 12 inches in May, at which time it suggests the herbicide be applied.

At this month’s Town Board meeting correspondence from two town residents, as well as from Town Engineer Ray Jurkowski, were read regarding the request to apply the chemical to the lake.

One of the letters was from Vincent Pedulla; he wrote in support of the herbicide.

“I am in favor of the application of the herbicide Renovate 3 to Twin Island Lake,� he stated. “I’m asking that the town block off the culvert between Twin Island Lake and Stissing Lake for the necessary period of time in May in order to confine the herbicide and prevent flow downstream.�

The other letter came from resident Norma Midthun; she too supported the Renovate 3 application.

“We are fortunate to have an enthusiastic and tireless panel to lead a remedial process which focuses on the latest scourge: milfoil,� she stated. “The lengthy preparation has been followed and we await final DEC approval. I urge you to support the sincere and concerned Twin Island Lake Association members in their efforts to improve and preserve this priceless ecological wonder in trust for us all.�

Town Supervisor Gregg Pulver, however, said one of the things he’s really concerned with is the blockage of the culvert along Beach Road.

“I want to find out how long they’re proposing to have that culvert blocked,� he said. “The DEC may have an issue with blocking the water, in addition to the herbicide itself.�

Meanwhile, Jurkowski expressed some concerns regarding the herbicide, which he wanted clarified before lending his support to the project. He did note, however, that using Renovate 3 to control watermilfoil is approved by the Federal Environmental Protection Agency (EPA) and accepted by the New York State Department of Environmental Conservation, with the appropriate permits.

His concerns, however, touched on the following:

“The information that has been provided does not include any detailed information regarding the scale of the proposed application or the proposed dosing rate,� he stated. “This office recommends that for information purposes, the applicator provide the town with the following information: proposed dosage rate; proposed location and scale of application; estimated total gallons to be applied; method of application; and a copy of the DEC permit application.�

Additionally, Jurkowski said he wants more information regarding the way Aquatic Control Technology, Inc., intends to limit migration of the herbicide downstream.

“This would potentially include providing an inlet control devise on the existing town culvert located at the outlet of the water body,� he stated.

For that, he suggested the following information be included:

• Engineering calculations regarding the anticipated water body outlet flows during normal and wet weather conditions

• Engineering calculations regarding the sizing of the outlet control devise and also the anticipated detention time prior to discharge

• Engineering calculations regarding the anticipated water surface elevations during normal and wet weather flow ensuring that the water surface elevations will not exceed the roadway elevation

• Details regarding the proposed construction of the proposed outlet structure; this may require an additional review and permit from the NYSDEC.

He also recommended post-treatment water sampling and an analytical laboratory analysis be conducted to ensure that “the residual levels meet DEC requirements,� as the DEC indicated “post-treatment use restrictions will be imposed, including restrictions on swimming and bathing, irrigation and water consumption.�

There were also questions raised about the annual bass tournament in June, put on by the Lions Club, which some board members worried may be affected by the application of the herbicide.

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