 All purpose was the low bidder of over two prospective firms, Hawkins Construction of Omaha and Building Crafts Incorporated of Red Oak. Shenandoah City Administrator A.J. Lyman tells KMA News the new construction upgrades the current plant built back in 1963, but no longer meets federal and state wastewater treatment standards. Our existing plant is a trickling filter plant. It does great at what it was designed to do when it was built 60-some odd years ago.