7/10/17-- SUDBURY-- Amanda Zareck, left, of Mansfield, a Sudbury U.S. Fish and Wildlife Service Invasive and Aquatic Weed Harvester Intern, and Gabby Dalfonso of the Sudbury U.S. Fish and Wildlife Service, hand pull water chestnuts from the Stearns Mill Pond Monday. [Daily News and Wicked Local Staff Photo/Art Illman]