MOUNT VERNON — Danville’s water line project will cost less than anticipated, if everything checks out. Knox County commissioners opened bids last week for the $470,000 project. Driven Excavating of Crestline submitted the lowest bid at $466,121. Four other companies submitted bids: •KN Excavation, Utica, $545,897.87 •Grassbaugh LLC, Glenmont, $525,947 •BK Layer, Perrysville, $479,290.50 •Saorsa Construction, New Concord, $563,618 The project in…