Able to adjust

摘要

Richard Wanner has been with the city of Bismarck, N.D., for 42 years, and currently serves as the maintenance supervisor of the water department. "We're the ones who do all the manhole adjusting," he said. "We're responsible for about 3,000 of them." North Dakota winters being what they are, road maintenance is constant, and each year about 120 manholes have to be lifted to match new pavement. And they have to match grade as closely as possible: If they project above grade, snow-removal equipment is sure to catch and damage them, and if they're below grade, the freeze-thaw cycle is likely to lead to infiltration problems.