St. Mary's Square Wastewater Pumping Station Replacement

Key Accomplishments

Johnston Construction Company

• JCC’s scope included demolition, bypass pumping, dewatering, earthwork, water service, paving, fencing, cast-in-place concrete, metal fabrications, moisture protection, doors, painting, protective lining, and related site work.
• The project included installation of a wet well mounted pumping station, pump control system, remote terminal unit, precast concrete control building, piping, valves, fittings, sluice gate, plumbing, heating, ventilation, electrical service and distribution, lighting, standby generator, and automatic transfer switch.
• JCC coordinated mechanical, electrical, controls, instrumentation, pumping station equipment, generator, automatic transfer switch, SCADA communications, startup, testing, demonstration, operator training, and closeout requirements.
• The work required maintaining wastewater pumping operations through temporary bypass pumping until the new station was operational and accepted.
• Johnston Construction Company completed the St. Mary’s Square Wastewater Pumping Station Replacement project for the St. Mary’s County Metropolitan Commission. The work was performed for Contract No. 8121SS.
• The project consisted of the demolition and replacement of the existing St. Mary’s Square Wastewater Pumping Station serving the St. Mary’s Square / Lexington Park area. JCC furnished the labor, materials, tools, equipment, utilities, transportation, supervision, and coordination required to complete the work in accordance with the contract documents, specifications, drawings, and addenda.
• The overall scope included demolition of the existing pumping station facilities and construction of a complete, fully finished, and operable replacement wastewater pumping station. The work included bypass pumping, dewatering, excavation support, earthwork, water service, asphalt pavement, pavement patching and repair, fencing and gates, cast-in-place concrete, grout, metal fabrications, under-slab vapor retarder, sealants and caulking, FRP doors, painting, and protective lining.
• The pumping station work included a wet well mounted pumping station, pump control system, remote terminal unit, precast concrete control building, piping, valves, elastomeric check valves, sluice gate, plumbing, heating and ventilation equipment, and related mechanical systems.
• Electrical and controls work included general electrical provisions, basic electrical materials and methods, electrical conduit trenching and backfill, service and distribution, grounding, lighting, standby power generator system, service entrance automatic transfer switch, wiring, instrumentation, controls, and related electrical appurtenances required for a complete operating station.
• JCC coordinated the pre-negotiated wet well mounted pumping station and pump control system scope, including pumping equipment, controls, submittals, installation coordination, startup, demonstration, training, and final turnover.
• The project required careful coordination with the Owner, Engineer, utility providers, subcontractors, suppliers, inspectors, and operations personnel to maintain wastewater service during construction. Temporary bypass pumping remained in place until the new pumping station was started, tested, demonstrated, and accepted for operation.
• The replacement station required startup, a demonstration period, operator training, operation and maintenance manuals, spare parts coordination, SCADA communication testing, punch list completion, final cleanup, as-built drawings, and closeout documentation.

B & R Electrical Contractors

• B & R Electrical Contractors performed electrical work for the St. Mary’s Square Wastewater Pumping Station Replacement project in Lexington Park / St. Mary’s County, Maryland.
• The project included electrical support for demolition and replacement of the existing St. Mary’s Square Wastewater Pumping Station.
• BRE’s scope included electrical demolition, conduit, wire, power connections, lighting connections, instrumentation conduit, generator installation, grounding, new electrical service to the existing SMECO enclosure, heat trace, inspection, testing, startup, and closeout support.
• BRE furnished and installed conduit, wire, and connections for power and lighting systems.
• BRE furnished and installed conduit, wire, and connections for instrumentation provided by others.
• BRE installed the emergency generator furnished by Johnston Construction Company.
• BRE performed demolition in accordance with the contract drawings and coordinated electrical make-safe work with the overall pump station replacement sequence.
• The work required coordination with Johnston Construction Company, St. Mary’s County Metropolitan Commission, Rummel, Klepper & Kahl, SMECO, equipment suppliers, instrumentation suppliers, electrical inspections, startup requirements, and overall pumping station replacement sequencing.
• B & R Electrical Contractors performed the electrical subcontract scope for the St. Mary’s Square Wastewater Pumping Station Replacement project in Lexington Park / St. Mary’s County, Maryland. The work was completed under subcontract to Johnston Construction Company for Job No. 2016-19.
• BRE’s electrical scope included furnishing labor, materials, tools, equipment, supervision, and coordination necessary to complete the electrical work in accordance with the contract plans, specifications, electrical drawings E-1 through E-8, addenda, and project requirements.
• Electrical demolition work included demolition per the contract drawings and coordination with the overall replacement of the pumping station facilities. BRE coordinated its work with JCC’s demolition and construction activities to support the safe removal of existing electrical systems and installation of new electrical infrastructure.
• New electrical work included conduit, wire, and connections for power and lighting. BRE also provided conduit, wire, and connections for instrumentation furnished by others. The conduit work included routing and installation for the control building, outside underground work, and wet well areas.
• BRE’s scope included the installation of the generator furnished by Johnston Construction Company. BRE coordinated generator installation with power distribution, grounding, startup, testing, and the overall standby power requirements for the pumping station.
• The electrical service work included new electrical service to the existing SMECO enclosure. BRE also performed grounding work and coordinated service requirements with the utility and project team.