This project is part of the broader rehabilitation program for the Oakland-Macomb Interceptor Drain (OMID), located within the International Transmission Co. (ITC) corridor. The work, executed under a lump sum bid through a General Contract, involved the construction of two cast-in-place control structures within a temporary earth retention system (TERS). Each structure required self-performing two-stage temporary circular earth retention systems, with diameters ranging from 39 to 51 feet and depths extending up to 100 feet below grade. The upper portion of the TERS utilized steel ribs and wood lagging boards, while the lower portion consisted of 3-foot diameter cement-stabilized drilled piers with 12-inch cement-stabilized plug piers. After completing the TERS, cast-in-place access structures were built from depths of 75 to 100 feet up to grade level.

Each control structure involved temporary dewatering using deep gravity wells and a series of educator dewatering wells, excavation, installation of temporary flumes, support rib steels within the existing active interceptors, backfill, electrical systems, and site restoration. The control structures were equipped with guide rails and grooves for stop gates, incorporating hydraulic sluice gates and actuators to enable mechanical operation during flow control management. Grout injection was performed both from the surface and inside the structure. Additionally, an existing control structure required modifications,
which included removing the existing gate and replacing it with a new stop gate featuring a hydraulic sluice gate and actuators, along with an electrical system to facilitate mechanical operation for flow control management.