St. Charles Communities – Stonehaven Pumping Station 8

Key Accomplishments

Johnston Construction Company

• The project included construction of a new below-grade wastewater pumping station and connection to existing force mains and utilities.
• Major work included wet well excavation with shoring, excavation dewatering, stone and mud mats below the wet well and pipe vault room slabs, generator pad preparation, and permanent support of excavation below the pipe room.
• Electrical and startup work included emergency generator, service entrance rated automatic transfer switch, pump station power and controls, conduit and wiring, lighting and receptacles, grounding, lightning protection, RVSS pump starters, and related electrical systems.
• The work required coordination with the local electrical utility for new transformer, new service and/or service upgrades, along with temporary bypass or pump-and-haul planning for shutdowns of the existing temporary pump facility.
• Johnston Construction Company completed Work Agreement A for the St. Charles Communities Pumping Station 8 project in Charles County, Maryland. The project was part of the Stonehaven Neighborhood within the Village of Wooded Glen and was designed by Whitman, Requardt & Associates, LLP.
• JCC’s work supported construction of a new below-grade wastewater pumping station. The scope included mobilization, bonds, insurance, submittals, excavation and shoring, electrical and startup work, builder’s risk insurance, coordination with local electrical utility providers, field investigations, and coordination with the Owner and Engineer.
• The work included excavation and backfill for the below-grade pump station, including wet well excavation with shoring, excavation dewatering, stone and mud mats below the wet well and pipe vault room slabs, and stone below the generator pad. The excavation scope required careful planning because the support of excavation installed below the pipe room was permanent and had to remain in place.
• JCC coordinated electrical and startup work for the pump station, including emergency generator and service entrance rated automatic transfer switch, secondary service conduits from the onsite transformer, primary conduits stubbed out from the transformer, pump station power and control conduit and wiring, lights and receptacles, grounding, lightning protection, RVSS pump starters, and underground conduit encasement where shown.
• The project also required coordination with the existing submersible Temporary Pump Facility located in MH-1A. Shutdowns that could not be completed during low flow periods or kept under four hours required temporary bypass pumping or pump-and-haul due to limited wet well storage.
• JCC worked with St. Charles Community, LLC, Whitman, Requardt & Associates, LLP, Concrete Services Division, LLC, Charles County, utility providers, and project subcontractors to coordinate excavation, electrical systems, startup, testing, training, and commissioning activities for the new pumping station.
• The Project Was Completed On 31st March, 2025

Concrete Services Division

• Concrete Services Division, LLC performed concrete placement, forming, finishing, curing, and related concrete work for the St. Charles Communities Pumping Station 8 project in Waldorf, Maryland.
• The project included concrete support for construction of a new submersible wastewater pumping station serving the Village of Wooded Glen / Stonehaven Neighborhood development.
• CSD’s scope included concrete placement management, footing formwork, slab-on-grade forming, straight wall forming, supported slab forming, special formwork, bulkhead forming, slab-on-grade placement, wall placement, fill placement, curb work, normal waterstop, reinforcing steel support, equipment pads, pipe pads, and overhang brackets.
• Major concrete work supported the pump station structure, below-grade pump station elements, wet well work, structural walls, slabs, equipment support pads, pipe support pads, and related concrete appurtenances.
• CSD furnished labor, material, tools, equipment, forming, finishing, curing, concrete accessories, reinforcing steel support, and layout coordination required to complete the concrete placement scope.
• The work required coordination with Johnston Construction Company, St. Charles Community, LLC, Whitman, Requardt & Associates, Charles County requirements, concrete suppliers, reinforcing steel suppliers, concrete pumping services, testing personnel, and overall pump station construction sequencing.
• Concrete Services Division, LLC performed the concrete subcontract scope for the St. Charles Communities Village of Wooded Glen / Stonehaven Neighborhood Pumping Station 8 project in Waldorf, Maryland. The work was completed under subcontract to Johnston Construction Company for Job No. 2021-04.
• CSD’s concrete scope included furnishing labor, materials, tools, and equipment necessary for concrete forming and placement in accordance with the subcontract documents, contract documents, drawings, specifications, and project requirements.
• Concrete work included concrete placement management, footing formwork, slab-on-grade formwork, straight wall formwork, supported slab formwork, special formwork, bulkhead formwork, slab-on-grade concrete placement, wall concrete placement, fill concrete placement, curb work, normal waterstop, reinforcing steel support, equipment pads, pipe pads, and overhang brackets.
• CSD’s work supported the pump station wet well, structural slabs, walls, equipment support areas, pipe support areas, and concrete elements required for the new wastewater pumping station facility.
• The subcontract included mobilization and demobilization of concrete equipment, tools, and supplies; purchase of form material and form lumber; installation and removal of forms; concrete labor; finishing labor; concrete curing labor; concrete accessory installation; concrete pumping coordination; and related concrete support activities.
• CSD’s scope included normal waterstop work and coordination of reinforcing steel, dowels, sleeves, embeds, anchor bolts, and related concrete accessories required for the pump station structure and appurtenances.
• CSD coordinated with Johnston Construction Company for concrete material, concrete testing, concrete pump support, excavation and backfill coordination, crane support, unloading of materials, jobsite access, and overall project sequencing.
• The work required careful coordination with the pump station construction sequence, including below-grade structure work, concrete placement, waterproofing coordination, equipment pad construction, pipe support pad construction, and integration with the station building and mechanical systems.

Additional project details

• JCC completed Work Agreement A for the Stonehaven Neighborhood pumping station within the Village of Wooded Glen.
• The project combined below-grade pump-station construction, electrical installation, startup, and utility coordination.