Charles County Pump Station 5A Building Access Modifications

Key Accomplishments

Johnston Construction Company

• Performed construction at an existing wet well/dry well sewage pumping station while coordinating continued wastewater operations.
• Completed work around an existing dry-well pumping system located approximately 23 feet below grade.
• Performed demolition necessary to accommodate the new building-access and process improvements.
• Installed a new wet well access hatch to improve access to the existing pumping facility.
• Coordinated structural and architectural modifications associated with the new access improvements.
• Designed, coordinated and implemented a temporary bypass pumping system so the existing pump station could be taken offline during critical portions of construction.
• Furnished the labor, equipment, temporary piping, power and maintenance necessary to support temporary pumping operations.
• Coordinated a bypass system designed around approximately 1,630 gpm at 81.2 feet TDH.
• Provided a minimum of two duty bypass pumps and one standby pump to maintain wastewater conveyance during construction.
• Maintained bypass-pumping capability 24 hours per day for the duration required to complete affected work.
• Used restrained temporary discharge piping and associated supports to reduce the risk of accidental wastewater releases.
• Coordinated pumping-system monitoring and maintenance to prevent high-level and overflow conditions at the station.

B & R Electrical Contractors

• Served as the Electrical Subcontractor to Johnston Construction Company for the Pump Station 5A Building Access Modifications project.
• Furnished the labor, materials, tools and supervision required to perform BRE's electrical scope.
• Performed electrical demolition associated with the pump-station modifications.
• Furnished and installed electrical conduit, wire and equipment connections.
• Installed galvanized rigid conduit (GRC) for exposed electrical work.
• Installed PVC conduit for underground electrical ductbanks.
• Performed excavation associated with BRE's underground electrical ductbank work.
• Installed underground raceways supporting the modified pump-station electrical systems.
• Installed electrical boxes and devices required for the project.
• Installed wiring and conductors serving modified and new equipment.
• Performed instrumentation-related electrical work included within BRE's subcontract.
• Installed project lighting furnished by Johnston Construction Company.
• Installed project switchgear furnished by Johnston Construction Company.
• Coordinated electrical materials supplied by others.