A revival is under way at the former Aberdeen Log Yard- not in timber, but in concrete pontoons that will support the State Route 520 floating bridge for decades to come. Construction started yesterday when the Washington State Department of Transportation and contractor Kiewit-General began transforming the 55-acre site into a facility capable of producing giant concrete floating bridge pontoons, 21 of which will be the largest ever built in the state. This week’s work includes site clearing and installation of high visibility and silt fences. Eventually, the site will include a concrete batch plant, a two-acre staging area and a casting basin measuring approximately 900 feet long, 200 feet wide and 30 feet deep. The site is scheduled to be complete by December.