A concrete example  

“19,500 ft. of roads, 43,000 ft. collection system and 20 foundations in 22 days … All it took was 17,000 tons of concrete … The 20-turbine Jeffers, MN Wind Farm project began in November and was completed before the ground froze.”

–Carstensen Contracting, Inc., ad in April 2009 North American Windpower