Gus Vina, already serving as acting city manager, has been selected to be the interim city manager for the following nine-to-12 months. City Manager Ray Kerridge resigned last month and will leave his post Friday. Kerridge has said he’s taking a private sector position, but has not yet announced where that position will be. Mayor Kevin Johnson and several council members held a press conference Wednesday to announce Vina’s new position. “And I think it’s very clear to all of us that (Kerridge) has very big shoes that we need to fill,” Johnson said. “And we feel that we found the right person to fill his shoes in a very short timeframe.” Johnson and the council members unanimously chose