McMinnville officials have agreed to a contract swap between Southern Central Iron and Metal in Warren County and Santek Waste Services Inc., of Cleveland.“Southern Central will be transferring our contract,” said McMinnville Public Works director Bill Brock. “They want our approval. They need the mayor to sign off on it.”The city entered into a municipal solid waste processing agreement with Southern Central Waste Services on July 1 for the facility to accept the city’s solid waste.