Wayland Town Crier 7/20/10: PCB cleanup begins in Natick's Pegan Cove. A large ring of yellow buoys floats on the surface of Pegan Cove, marking the area where contractors have started removing sediment contaminated with PCBs, left by an accident at the Soldier Systems Center 30 years ago. The PCBs were found in the section of Lake Cochituate just to the east of Natick Labs. They came from a transformer explosion in 1980 and got into the lake through a storm drain. Charter Environmental of Boston is handling the cleanup, with dredging work done by subcontractor Inner Space Dredging of Maine. The Defense Department is picking up the $2.8 million tab.