Rehabilitation of Three Sanitary Pumping Stations

Location: Washington, DC

Client: District of Columbia Water and Sewer Authority

CCJM is the Prime consultant for rehabilitating the Rock Creek, Upper Anacostia and Earl Place Pumping Stations in Washington, DC.

The project includes a Rehabilitation Concept Report (RCR) and the Design and Construction Phase engineering services. Each pumping station’s structural integrity, mechanical equipment, electrical and instrumentation systems, HVAC, and plumbing systems were evaluated to determine whether the systems met current codes and how to improve the stations to provide another 20 years of service. A brief summary of the work for each station as follows:

Rock Creek Pumping Station

The Rock Creek Pumping Station, built in 1921, had prior upgrades in 1951 and in 1953. The Station has three pumps with three separate suction wells with a pump capacity of 21.6 mgd each. The pumping station was originally designed to pump a maximum flow of 60 mgd, but due to hydraulic constrictions, the pumping station is limited to 43 mgd. The upgraded pumping station provides a firm capacity of 50 mgd. The wet well and dry well is properly isolated to meet NFPA requirements. The new dry pit submersible pumps with variable speed drives, piping, valves, controls, and new odor control system were installed. The entire HVAC, electrical, and instrumentation systems were replaced due to code issues and severe deterioration. A standby power connection was added to the electrical system.

Rock Creek Pumping Station Rock Creek Pumping Station Rock Creek Pumping Station

 

Upper Anacostia Pumping Station

The Upper Anacostia Pumping Station was constructed in 1934 and was partially upgraded in the 1970s. The Station has three, 40 HP pumps each with a 5 mgd capacity at TDH of 30.3 feet. The average daily flow rate, however, is only 1.6 mgd with wet weather increasing flow rates to 6.3 mgd. The existing pumping station needed significant renovation and the cost to upgrade the Station was compared to that of designing and constructing a new submersible pumping station. It was determined that a submersible pumping station will be more cost effective since no structural changes will have to be performed. A standby power connection will also be provided for the new pumping station.

Upper Anacostia Pumping Station Upper Anacostia Pumping Station Upper Anacostia Pumping Station

 

Earl Place Pumping Station

The Earl Place Pumping Station is adjacent to the CSX Railroad. The Station was constructed in 1926 with two 300 GPM pumps. The Station rehabilitation includes new pumps, piping, valves, controls and HVAC replacement and a trash basket installed in the wet well. The relatively short discharge force main was replaced during the pumping station bypass operations.

Earl Place Pumping Station Earl Place Pumping Station Earl Place Pumping Station