EEA assisted Antioch Community Consolidated School District 34 with replacing an existing, large diameter culvert on the Sequoit Creek, an active waterway with an Advanced Identification (ADID) wetland determination.
The school district and EEA’s team identified that the existing culvert was deteriorating and in need of replacement. The corrugated metal pipe failed to reach its anticipated life span and the school district wanted to investigate different material alternatives to increase its durability. EEA researched several culvert options and recommended a concrete box culvert solution that avoided altering the crossing’s flow characteristics.
During construction, a temporary stream diversion was formed to guide the waterway around the work zone. This reduced the risk of soil erosion polluting the remaining waterway and downstream lakes. The diversion swale concept also created a dry work zone allowing the contractor to complete the project in a shorter period of time and minimized the roadway closure at the crossing.
As part of the project, EEA secured all necessary permits through the Army Corps of Engineers, the Lake County Stormwater Management Commission, Illinois Department of Natural Resources, and the Village of Antioch.