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Main and O Pump Station Rehabilitation

Main and O Pump Station Rehabilitation Washington, DC

Main Office

Project Owner: DC Water and Sewer Authority 5000 Overlook Avenue, SW Washington, DC 20032

Project Location: Washington, DC

Contract Amount: $51,500,000

Project Description:
This project involved the complete rehabilitation of both the Main Pumping Station and the "0" Street Pumping Station. Both buildings, which were occupied throughout construction, had to be kept in service at all times. In fact, we had to supply a complete temporary office complex, with furniture and equipment, for the building occupants during the various phases. We also had to construct a temporary bypass system to keep the flows in service. The Main Pumping Station, which is also a historical building, was restored on the exterior with new historical windows, tuck pointing and cleaning.

Some of the major architectural features included: extensive lead abatement and asbestos removal; major demolition, interior shoring; concrete repair work, including spall repair, crack injection and extensive shotcrete work; masonry restoration work, tuck pointing and reconstruction of stone elements; structural steel, bar strengthening, ornamental railings; new roofing, both elastomeric liquid and built-up; special sliding and folding doors; window restoration work, including removal of existing wood and steel windows; extensive painting with associated sandblasting and wall surface repairs.

Another major feature of the project involved the construction of a seawall. This work included geotechnical engineering, erosion controls, turbidity curtain, demolition, dewatering, dredging, construction of a cofferdam, auger piles and the building of a new concrete seawall. There was also extensive instrumentation and monitoring work associated with the seawall construction.

Mechanically, the work entailed a renovation of the HVAC and mechanical system in the building. We also furnished and installed new pumping equipment, mechanical screens, odor control systems and sluice gates, stop logs and flexible flap gates. The electrical work on the project was extensive, as it involved the replacement of the existing electrical distribution system in its entirety.