It was a worrisome time for residents of one part of Tequesta late yesterday afternoon. Many of them were being evacuated because of a gas leak. In fact emergency crews were working on the problem late into the night Thursday. On Old Dixie Highway, a 30-thousand-gallon LP tank was leaking. It was about a quarter mile south of County Line Road. Homes and businesses within a half mile of the leak were evacuated. They also shut down several streets. The tank was being filled and was nearly full when the leak occured.