Firefighters are crediting an apartment sprinkler system with saving multiple lives at an apartment complex in the 2400 block of Winnebago Street. Crews were dispatched to the Carbon Apartments at Union Corners just before 5 p.m. Thursday night for a report of thick black smoke coming from under the door of a second-floor apartment. When firefighters entered the apartment building, they found that the sprinkler system had activated and put out the fire. The water dripped down to an apartment and office on the first floor. The fire caused an estimated $30,000 in damage to the contents of the second-floor apartment. Officials also reported an additional $100,000 in damage to the building.