LocationAberdeen Proving Ground, Maryland
MarketPump Stations
WASTEWATER PUMP STATION REPLACEMENT, PRECAST UNDERGROUND PACKAGE STATION, GRAVITY SEWER, FORCE MAIN, BYPASS PUMPING, TELEMETRY / SCADA INTEGRATION, SITE RESTORATION, TESTING AND STARTUP.
Johnston Construction Company
- Johnston Construction Company served as Prime Contractor for the replacement of Wastewater Pump Station 447 at Aberdeen Proving Ground. The project consisted of abandonment of the existing wastewater pumping station and construction of a new precast-concrete underground package pump station, together with new sections of gravity sewer and force main.
- Executed the project within the restricted Aberdeen Proving Ground installation, where construction access required special security clearance and permitting. The work therefore required coordination of personnel, equipment, deliveries and construction activities within an active secured facility.
- Maintained continuous wastewater pumping capacity throughout construction. JCC was required to sequence the work so that sufficient pumping capacity remained available for all anticipated flows and full-capacity flow through the piping system was maintained during the construction period.
- Provided temporary bypass pumping and flow-diversion capability when required to allow the existing pumping station and affected pipelines to be modified without interrupting wastewater service. The specifications required temporary pumping equipment and standby capacity, including extra pumps and power generators, where bypass pumping was necessary.
- Installed the Owner-furnished precast underground package pump station. The complete package incorporated a reinforced-concrete structure, non-clog wastewater pumps and motors, process piping, valves, pump controls, electrical conduit and wiring, access hatches, ladder and associated appurtenances. The City purchased the package station and delivered it to the site for installation by JCC.
B & R Electrical Contractors
- B & R Electrical Contractors, Inc. served as the electrical Subcontractor to Johnston Construction Company, the Prime Contractor, for replacement of Wastewater Pump Station 447 at Aberdeen Proving Ground. The overall project replaced an existing wastewater pumping station with a new precast-concrete underground package pump station and associated gravity-sewer and force-main improvements.
- Furnished labor, materials and tools for the electrical construction package in accordance with project Drawings 1 through 7, Division 16 of the specifications, BRE's proposal and the project contract documents.
- Installed the electrical backboard and associated conduit, junction boxes, conductors and electrical connections. The subcontract specifically required PVC-encased conduit below grade and rigid metal conduit for exposed installations, providing durable raceway systems suitable for the wastewater pump-station environment.
- Coordinated installation and connection of the new pump-station electrical equipment with JCC-furnished disconnect switches, while JCC separately provided the excavation, backfill and concrete base associated with the electrical backboard.
- Connected the new pumping and level-control systems to the existing starters and telemetry system. The Division 16 requirements called for new wet-well floats to be connected to the existing DFS telemetry control unit, together with a replacement submersible level transducer connected back into the existing telemetry system.