(St. Charles, MO)  —  Members of a union that represents most Schnucks workers are going to vote on a new contract.  Schnucks and the union reached a tentative contract agreement on Friday night.  Now it’s up to the union members to decide whether to accept the terms of the agreement.  The union members will vote on the new contract tonight at the Family Arena in St. Charles.  The full service grocer lists 35 Illinois locations including Centralia on its website.