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ENB Region 1 Notices 4/7/2021

Negative Declaration

Suffolk County - The New York State Department of Environmental Conservation (NYS DEC), as lead agency, has determined that the proposed Pilot Herbicide Treatment of Ludwigia Peploides in the Peconic River will not have a significant adverse environmental impact. The action involves the use of United States Fish and Wildlife Service (US FWS) Aquatic Nuisance Species (ANS) Management Grant funds, the NYS DEC will work with State University of New York (SUNY) Stony Brook to hire an environmental consulting firm with licensed contractors to treat an approximately one acre area of the Peconic River at the NYS DEC Edwards Avenue Fishing/Canoeing Access Site with a combination of imazamox and florpyrauxifen-benzyl. The treatment will be targeted to the floating leaves of Ludwigia peploides which will greatly reduce non-target impacts to other plants. During summer and fall the area is densely matted with Ludwigia peploides which impedes recreation and impacts water quality. If left unchecked, these dense mats may impact native habitat as well as pose a risk of spread to downstream habitat and other nearby water bodies. For more than a decade NYS DEC and stakeholders have hand-pulled Ludwigia peploides as a means of management, but have been unsuccessful in controlling it. Herbicide treatment is now the recommended option in order to reduce the threat of Ludwigia peploides spread throughout the Peconic River. The project is located in the Town of Riverhead, New York.

Contact: Catherine McGlynn, NYS DEC - Division of Fish and Wildlife, 625 Broadway, 5th floor, Albany, NY 12233, Phone: (518) 408-0436, E-mail:

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