WRA New Main Outfall, Phase 17, Segment 7

Completed in 2014 by Oscar Renda Contracting, the WRA New Main Outfall, Phase 17, Segment 7 project consisted of expanding and reinforcing critical sanitary sewer and water conveyance systems. This project included the installation of approximately 150 linear feet of large-diameter 144-inch sanitary sewer, 800 linear feet of 36-inch sanitary sewer, and 800 linear feet of twin 90-inch sanitary sewer, each engineered to meet high-capacity sewage and wastewater conveyance needs. Additionally, the project included the installation of 1,100 linear feet of a 30-inch water main, which further supported the surrounding community by enhancing the water supply infrastructure.
A key component of this project was the construction of a river box system, which was built to safely manage water flow and ensure efficient, reliable sewage and water conveyance. The river box system’s design involved precision concrete encasement to provide structural integrity, protecting the pipeline from water pressure and environmental elements. A significant engineering challenge in the project involved constructing a coffer dam across the Des Moines River, which was essential for controlling water flow and maintaining a safe, dry work environment during pipeline installation. This coffer dam enabled workers to execute the project without disrupting the natural river flow, allowing for efficient construction while prioritizing environmental stewardship.
The extensive scope of work for this project required careful planning and execution. Initial site preparation included clearing and grading, creating a stable foundation for construction activities. Dewatering was an essential part of the process, ensuring that the work area remained free from groundwater and river interference, which was critical for accurate pipeline placement and structural work. Once the site was prepared, excavation commenced to lay the pipelines at precise depths and positions, accommodating the high-capacity requirements of the new outfall system. Structural concrete placement followed, with reinforced concrete providing the necessary strength and durability to withstand operational pressures and environmental forces.
Upon completion of the pipeline installation and structural work, Oscar Renda Contracting carried out a final phase of site restoration. This included landscaping to return the area to a natural state, providing erosion control and enhancing the surrounding environment. Concrete paving was added to provide stability and support for access routes, ensuring the area would be both functional and aesthetically restored. The WRA New Main Outfall, Phase 17, Segment 7 project exemplifies Oscar Renda Contracting’s expertise in handling complex water and wastewater projects, combining advanced engineering, environmental management, and quality construction practices to create infrastructure that will serve the community for decades.