Longtime WBZ Radio personality Steve LeVeille is retiring, the station announced Tuesday. Program director Peter Casey said the host of “The Steve LeVeille Broadcast’’ will be done at the end of the week. LeVeille, who’s 57, said in a statement he’s always wanted to retire early. “This is a quality of life decision for my wife, Diane, and me… After spending most of our weekends and vacation time in Maine for the last 15 years, we are looking forward to making it our year-round home.’’ LeVeille has worked in radio for more than 35 years and has been with WBZ since 1991. He began his career in 1977 at WEEI, which was then an all-news station.