Division I – Main Pump Station Diversions Project

The Division I project includes the construction of two diversion chambers along combined sewers more than 100 years old. Interconnecting channels will deliver the diverted sewer to a drop shaft and tunnel. The project includes the control and consolidation of CSOs 009, 011A, 012, 013 and 014 at the Main Pumping Stations located in Washington, DC; two hydraulic diversion structures constructed over two existing 14-foot high by 14-foot wide active trunk sewers; maintenance of flow in 54-inch and 42-inch sewers; and extension of a 72-inch sewer under one of the trunk sewers. Key design elements include structural design, deep support of excavation, analysis and protection of existing structures, ground improvement, maintenance of flow, and a 172-foot long 72-inch sewer extension.

L. S. Caldwell & Associates, Inc. (LSC) has responsibility for the development, implementation, and monitoring of the Fair Share Objective initiatives for the District of Columbia Water and Sewer Authority’s (DC Water) Clean Rivers Project. This $2.6 billion program is the result of a Consent Decree signed by the District of Columbia, the Environmental Protection Agency, the Department of Justice. DC Water was required to clean up the Anacostia and Potomac Rivers by 2025. Seven discrete portions of the work, called Divisions, are underway; totaling approximately $819,368,566.00. Twelve Divisions are anticipated.