![tunnel surveying](https://www.hrcengr.com/wp-content/uploads/2016/12/featured_CSOtunnel.jpg)
HRC provided tunnel surveying, design and construction observation for the Birmingham Combined Sewer Overflow (CSO) control facilities, constructed as part of an $82 million national demonstration project. The demonstration project is a three-phase project aimed at eliminating CSOs in the Rouge River watershed. The Birmingham Retention Treatment Basin…