LocationWalkersville, Frederick County, Maryland
MarketPump Stations
WASTEWATER PUMP STATION REHABILITATION, TEMPORARY BYPASS PUMPING, FORCE MAIN AND MANHOLE IMPROVEMENTS, COMMINUTOR, FLOW METERING, TELEMETRY, BACKUP POWER, VENTILATION, STRUCTURAL MODIFICATIONS AND SITE RESTORATION.
Johnston Construction Company
- Johnston Construction Company served as Prime Contractor for the comprehensive upgrade of the existing College Run Sewage Pumping Station for Frederick County, Maryland. The contract encompassed the labor, equipment and materials necessary to rehabilitate the operating wastewater facility, including controls, electrical systems, lighting, backup power, ventilation, structural and architectural modifications, process equipment, piping and site improvements.
- Designed, installed, operated and maintained a temporary wastewater bypass-pumping system capable of handling a peak flow of 3.50 million gallons per day. The bypass system was required to operate continuously whenever the station was shut down and had to maintain uninterrupted sewage conveyance around the construction area.
- Provided redundant temporary pumping capacity, including a fully installed standby pump for each pump size used so that wastewater service could continue immediately in the event of equipment failure or emergency conditions.
- Maintained continuous operation of Frederick County's wastewater collection system throughout construction. The bypass system included restrained temporary discharge piping, plugs, pumping equipment, temporary power and controls necessary to prevent interruption, surcharging, flooding or sewage spills.
- Performed permanent force-main and process-piping improvements associated with the upgraded pumping station, including new force-main piping, bypass connections, valves and appurtenances. Ductile-iron force-main piping was specified as Class 53.
B & R Electrical Contractors
- Furnished the labor, materials and tools required for the pumping-station electrical construction, coordinating its work with JCC's overall rehabilitation of the existing wastewater facility and with equipment furnished by other parties.
- Furnished and installed a new Motor Control Center, 15 kVA transformer, Panel LP and required disconnects, establishing the principal power-distribution and motor-control infrastructure required for the rehabilitated station.
- Installed conduit, conductors and electrical equipment for the new electrical service from the existing utility transformer, providing the permanent service connection necessary to support the upgraded pumping-station equipment.
- Installed the JCC-provided standby generator and completed its associated conduit and wiring. BRE's subcontract specifically included installation and electrical connection of the generator while generator fuel, generator testing and removal of the existing generator were excluded from BRE's scope.
- Coordinated the station's normal and emergency power-distribution systems, including the Motor Control Center and associated automatic-transfer-switch requirements contained within the project's electrical specifications. The overall station design incorporated a 200-amp, 480/277-volt, three-phase, four-wire automatic transfer switch serving normal and emergency power.