Severn Run Sewage Pumping Station – Wet Well Expansion

Key Accomplishments

Johnston Construction Company

• JCC’s scope included construction coordination, demolition, excavation, shoring, dewatering, bypass pumping, piping, grinder replacement, motorized jib crane installation, aluminum covers, wet well supply fan, site restoration, startup, testing, training, and closeout.
• Major work included construction of a new rectangular cast-in-place concrete wet well expansion and associated mechanical, piping, electrical, instrumentation, and structural improvements.
• The project required coordination with Anne Arundel County operations to maintain pumping station service, perform bypass pumping, protect existing utilities, and complete work within the active station site.
• Johnston Construction Company completed the Severn Run Sewage Pumping Station Upgrade for Anne Arundel County Department of Public Works. The project consisted of improvements at the existing Severn Run Sewage Pumping Station, including mechanical, structural, electrical, instrumentation, and site modifications associated with construction of a new wet well expansion.
• The work included demolition of the existing jib crane, access platform, ladder, bollards, hydraulic grinder, dual 12-inch pump-around suction piping and supports inside the existing wet well, underground ferrous sulfate tank and appurtenances, pump-around discharge piping connection and support pad, fencing, and paving. JCC coordinated demolition sequencing with the County to maintain station access and continued operation.
• A major component of the project was construction of a new rectangular cast-in-place concrete wet well expansion. The work included structure excavation, shoring, dewatering, structural backfill, installation of split sleeves around existing 36-inch cast iron and 30-inch ductile iron influent pipes, sawcutting two openings in the 18-inch-thick wall between the existing and new wet wells, and completing connections to the existing station.
• JCC installed new mechanical and process components, including a new hydraulic grinder, associated power pack, new dual 12-inch pump-around suction piping and supports inside the new wet well, new motorized jib crane, aluminum covers, wet well supply fan, associated appurtenances, piping, and site improvements.
• The project also included replacement of existing piping from Manhole 10154 to the new wet well wall and from Manhole 39083A to the new wet well wall, installation of 18-inch HDPE bypass piping, thrust block, concrete encasement, plug valve and tapping valve work when directed by the Engineer, and coordination of bypass pumping for the new and existing wet wells.
• JCC coordinated the work with electrical, instrumentation, and concrete crews to complete the new wet well expansion, equipment installation, controls integration, startup testing, manufacturer training, O&M manuals, as-built drawings, site cleanup, paving, fencing, landscaping, and final restoration.
• The Project Was Completed On 31st December,2020

Concrete Services Division

• Concrete Services Division, LLC performed concrete forming and concrete placement work for the Severn Run Sewage Pumping Station Wet Well Expansion project in Severn, Maryland.
• The project included concrete support for the expansion and modification of the existing Severn Run Sewage Pumping Station wet well.
• CSD’s scope included concrete forming, concrete placement, finishing, curing, structural concrete support, reinforcing steel support, dowels, small tools, form slabs on grade, form straight walls, form unsupported slab, place slab on grade, place wall concrete, place supported slab, point and patch, curb work, and associated concrete coordination.
• Major concrete work included the west wet well expansion slab, west wet well expansion perimeter walls, west wet well expansion channel bottom wall, wet well expansion channel bottom, wet well expansion top slab, and miscellaneous concrete items.
• CSD furnished labor, material, tools, and equipment required for concrete forming and placement in accordance with the contract documents and project specifications.
• The work required coordination with Johnston Construction Company, Anne Arundel County, concrete suppliers, reinforcing steel suppliers, concrete pump providers, testing laboratory, layout providers, excavation support, and overall wet well expansion sequencing.
• Concrete Services Division, LLC performed the concrete forming and concrete placement scope for the Severn Run Sewage Pumping Station Wet Well Expansion project in Severn, Maryland. The work was completed under subcontract to Johnston Construction Company for Job No. 2015-24.
• The overall project consisted of improvements to Anne Arundel County’s Severn Run Sewage Pumping Station. The project included mechanical, electrical, and structural modifications associated with the expansion of the existing wet well.
• The broader project scope included demolition of existing equipment and appurtenances, construction of a new rectangular cast-in-place concrete wet well expansion, installation of temporary bypass pumping, sawcutting openings between the existing and new wet wells, installation of a new hydraulic grinder, motorized jib crane, aluminum covers, wet well supply fan, piping, instrumentation, and related appurtenances.
• CSD’s concrete scope included furnishing labor, materials, tools, and equipment necessary for concrete forming and concrete placement at the Severn Run Sewage Pumping Station Wet Well Expansion project.
• Concrete work included the west wet well expansion slab, west wet well expansion perimeter walls, west wet well expansion channel bottom wall, wet well expansion channel bottom, and wet well expansion top slab. CSD also performed related small tools, straight wall forming, slab-on-grade forming, unsupported slab forming, wall placement, supported slab placement, point and patch, curb work, and concrete finishing.
• CSD’s scope included concrete finishing, curing, form material, purchased form lumber, installation and removal of formwork, placing concrete, finishing concrete, concrete curing supplies, and concrete pump coordination.
• The subcontract included reinforcing steel support, including unloading rebar and installing reinforcing steel where required by CSD’s scope. The work also included coordination of anchor bolts, dowels, sleeves, embeds, and related concrete accessories.
• CSD coordinated with Johnston Construction Company for concrete material, concrete testing laboratory services, concrete pump rental, excavation layout, crane support, outside equipment, and project sequencing. JCC provided concrete material, the concrete testing laboratory, concrete pump rental, excavation layout, crane operation, and other support items noted in the subcontract.

B & R Electrical Contractors

• B & R Electrical Contractors, Inc. performed electrical work for the Severn Run Sewage Pumping Station Wet Well Expansion project in Severn, Maryland.
• The project included electrical support for the expansion and modification of the existing Severn Run Sewage Pumping Station wet well.
• BRE’s scope included electrical demolition, conduit, wiring, electrical connections, circuit breaker installation, wet well supply fan control panel work, gas detection power, hoist power, grinder disconnect work, RTU control and alarm connections, testing coordination, as-built drawings, and project closeout support.
• Major electrical work included demolition of the existing wet well supply fan control panel and furnishing and installing new conduit, wire, and electrical connections for the wet well expansion improvements.
• BRE provided a 480V, 3-phase circuit breaker from the existing Power-Line Q switchboard to feed the new grinder control panel.
• BRE furnished and installed electrical work associated with the wet well supply fan control panel, gas detection system power, hoist power, grinder disconnect switch, tank controls, and connections to the existing RTU panel for controls and alarms.
• The work required coordination with Johnston Construction Company, Anne Arundel County, equipment suppliers, control system requirements, shop drawings, O&M manuals, construction sequencing, testing, and closeout documentation.
• B & R Electrical Contractors, Inc. performed the electrical subcontract scope for the Severn Run Sewage Pumping Station Wet Well Expansion project in Severn, Maryland. The work was completed under subcontract to Johnston Construction Company for Job No. 2015-24.
• The overall project consisted of improvements to Anne Arundel County’s Severn Run Sewage Pumping Station. The project included mechanical, electrical, and structural modifications associated with the expansion of the existing wet well.
• The broader project scope included demolition of existing equipment and appurtenances, construction of a new rectangular cast-in-place concrete wet well expansion, installation of temporary bypass pumping, sawcutting openings between the existing and new wet wells, installation of a new hydraulic grinder, motorized jib crane, aluminum covers, wet well supply fan, piping, instrumentation, and related appurtenances.
• BRE’s electrical scope included furnishing labor, materials, tools, supervision, and electrical services necessary to complete the electrical work associated with the Severn Run SPS wet well expansion.
• Electrical demolition work included demolition of the existing wet well supply fan control panel and related electrical components required to accommodate the new work.
• New electrical work included furnishing and installing conduit, wiring, and electrical connections required for the wet well expansion improvements. BRE furnished and installed a 480V, 3-phase circuit breaker from the existing Power-Line Q switchboard to feed the new grinder control panel.
• BRE’s work included wet well supply fan control panel electrical work, electrical connections, and coordination with the new wet well supply fan system. BRE also provided two 20-amp GFCI receptacles from the existing control panel to feed the gas detection system and hoist.