Olney 1.5 MG Elevated Water Storage Tank & Standpipe Replacement

Key Accomplishments

Johnston Construction Company

• Furnished the required construction layout and surveying necessary to establish JCC's civil and mechanical work.
• Installed and maintained the required erosion and sediment-control measures, including coordination with the appropriate regulatory agencies throughout the construction period.
• Performed access-road demolition, clearing, grading and general site preparation associated with construction of the replacement tank.
• Constructed the new tank's spread-footing foundation in accordance with the tank manufacturer's foundation requirements.
• Prepared the tank construction area in accordance with the specified minimum site-preparation requirements, including installation of required hoist deadman facilities and foundation guyline anchors.
• Constructed the concrete floor and pipe supports inside the base of the new tank.
• Maintained the construction area at the required grades following excavation and established drainage away from the tank foundation.
• Coordinated existing utility locations before excavation and construction activities.
• Provided concrete testing, soils testing and subgrade-bearing inspection, together with the associated testing documentation and reports.
• Furnished and installed the required floor-drain piping within JCC's mechanical scope.
• Furnished and installed the tank's overhead door and personnel-access door.
• Furnished and installed the project's major water-distribution piping, valves, fittings, hydrants, supports and thrust blocks, beginning at the limits of the 16-inch water main at Buehler Road and extending toward the new elevated tank.

Concrete Services Division

• Performed the specialized structural concrete package supporting construction of the Olney replacement elevated water storage facility.
• Provided forming and concrete-placement work for the tank foundation, derrick slab, tank slab and Altitude Valve Vault, including the vault slab, walls, top slab, pipe pads and fill concrete.
• Supported WSSC's larger Olney Standpipe Replacement project, which included construction of a new 1.5-million-gallon elevated water storage tank, associated piping, valves, vaults, access improvements and eventual demolition of the existing standpipe.
• Mobilized and demobilized the concrete construction equipment, tools and supplies required to execute CSD's work.
• Provided the required form-material rental and form lumber for CSD's concrete operations.
• Installed and stripped structural formwork for the various concrete elements included in the subcontract.
• Constructed formwork for concrete footings, establishing the geometry required for the tank-foundation system.
• Constructed slab-on-grade formwork associated with the tank and supporting structures.
• Constructed both curved-wall and straight-wall formwork, accommodating the different structural geometries required by the tank-foundation and valve-vault systems.
• Constructed supported-slab formwork for elevated or structurally supported concrete elements.
• Performed concrete-placement labor for footings, slabs on grade, walls and supported slabs.
• Performed placement of grout and fill concrete associated with the completed structural-concrete work.
• Completed concrete finishing using float and screed operations to establish the required elevations, surfaces and profiles.
• Performed machine-trowel finishing where required for finished concrete surfaces.