A Dartmouth College alumnus and his family are offering to match up to $5 million toward rebuilding the college's 77-year-old lodge in the White Mountains. The Moosilauke Ravine Lodge is situated in Warren, and was built in 1938. It is the end destination of Dartmouth's First-Year Trips program, and is used for orientation programs for the college's medical and business schools. George ''Skip'' Battle, a 1966 graduate, will match all contributions toward the rebuilding project made until next June 30 up to $5 million. The project is expected to cost $17 million, with construction beginning next September. Battle is a senior fellow at the Aspen Institute and former CEO of Ask.com.