Giles Run Pumping Station Rehabilitation

Lorton, VA

Fairfax County’s Department of Public Works and Environmental Services desired the rehabilitation of the Giles Run Pump Station to replace existing equipment in need of upgrades, modify the control building, and increase the design capacity to meet a daily flow of two million gallons per day (MGD).

With a large residential area, a school, and a shopping center relying on this pump station for sewage removal, HITT diverted the flow to a bypass system while upgrading the equipment. These upgrades enabled the pump station to meet the required daily flow to service this area.

The equipment upgrades required HITT to replace two existing sewage pumps with new Flygt pumps. Major pump station upgrades also included demolishing the existing below-grade precast wet well structure, sewage pumps and motors, influent manhole, precast concrete meter vault, valves, pipe, exhaust fans, station controls equipment and associated electrical equipment, instrumentation, conduits, and piping.

The demolished space was excavated for a new 5,600-cubic foot precast concrete wet well and associated piping. The wet well is approximately 23 feet deep in a lay-down site surrounded by the controls building, existing valve vault, public walkpath, and the upstream manhole.

HITT furnished and installed the new precast concrete wet well, sewage pumps and motors, grinder, valves, pipe, bypass connection, exhaust fans, station controls equipment, and associated electrical equipment, instrumentation, and piping.

Modifications of the control building included a new SCADA communications system that can be controlled and operated locally or from remote locations. The exterior improvements included updating the control building masonry structure and façade; replacing the roof, gutters, and downspouts, and installing a new HVAC system.