SANFORD — The opening of the new Sanford High School and Regional Technical Center may be delayed, Superintendent David Theoharides told the Sanford School Committee on Monday. “It looks like (the contractors) are about a month behind,” said Theoharides. “I believe we will be able to get into the building by mid-September, but we will actually start classes there probably the first week in October, around Columbus Day,” said Theoharides. Classes would commence as usual in the current high school and technical center on Sept.