The Hadley Planning Board is scheduled to hold a public hearing Oct 16 at 7:30 PM on a new subdivision plan that will allow the proposed Wal-Mart Supercenter at Hampshire Mall to proceed. If approved by the Planning Board, the subdivision plan will give Wal-Mart eight years of grandfathering protection from Hadley’s limit of 75,000 square feet on new retail buildings. Town Meeting passed that limit by an overwhelming 3 to 1 margin in May 2006. Wal-Mart’s proposed Supercenter is 212,000 square feet, plus a 12-acre parking lot. The meeting will take place on the second floor of the Hadley Senior Center at 46 Middle Street.