CORALVILLE — You’d be hard pressed to find a corner of Coralville that hasn’t been impacted by Dan Holderness.Thanks to the community’s growth and his nearly 35 years as city engineer — he’s Coralville’s longest-tenured employee — Holderness has had a hand in many large infrastructure projects including work on the city’s water plant twice, redoing the wastewater plant twice, two new water towers and rebuilding the Highway 6 and First Avenue intersection three times.On top of that, Holderness has helped the city respond to four floods, oversaw more than $70 million in flood improvements after 2008 and his work with the Environmental Protection Agency’s Brownfields Program paved the way for the Iowa River Landing development.