A propane tank leak Tuesday afternoon at the Northridge Apartment Complex in Wright City was eventually quelled after a nearly two-hour battle. Fire protection officials said white vapor was coming from the tank, which was elevated to 95 percent capacity upon their arrival. "The pressure release valve had already popped off," said Wright City Assistant Fire Chief Todd Van Zuyen. "The heat makes it pressurize and the tank was hot. Luckily, we had an established water supply." MFA Oil employees pumped the tank down to 70 percent capacity, which is what pressure levels typically are in winter. The Wright City Police Department evacuated four apartment buildings near the tank. The next set of four apartment buildings were evacuated voluntarily by residents. Immanuel United Church of Christ served as a cooling shelter for residents who were temporarily without apartments. "It was a long call," said Van Zuyen, of the time spent combatting the leak. The Wright City Fire Protection District was joined by units from Warrenton, Wentzville and Marthasville. "I was rotating guys out about every 15 to 20 minutes," Van Zuyen said. "I had two ambulances on scene, in case (of any injuries or illnesses). That's why I had to get so many people out there because of the heat. "We were making sure everybody was hydrated," he added. No injuries or illnesses occurred, officials said.