Walmart, the fastest growing retail chain in the nation,has plans to construct a store in Mahoning Township - directly across the street from Carbon Plaza in a field next to the proposed Lehighton Train Museum. The plans were unveiled during a meeting of the Mahoning Townsip Planning Commission. Some local residents attended the meeting and expressed opposition to the store. Dave Sutton, an engineer for Walmart, said no definite timetable for the store exists.