Mattawoman WWTP Building 22A Doorway Expansion

Johnston Construction Company

• Served as Prime Contractor for the Building 22A exterior doorway modification at the operating Mattawoman Wastewater Treatment Plant. The primary objective of the project was to increase the height of the existing front roll-up door opening to accommodate the facility’s operational access requirements.
• Coordinated and executed the complete doorway-expansion construction package, including scheduling, supervision, labor, materials, equipment, tools, mobilization and demobilization necessary to complete the work in accordance with the County’s drawings and construction requirements.
• Performed structural modifications to the existing masonry wall assembly to create the enlarged roll-up door opening. The work included masonry removal and installation of a new structural lintel above the modified opening, with the lintel furnished by Johnston Construction Company and the masonry activities coordinated through JCC’s specialty masonry subcontractor.
• Managed construction within an existing wastewater-treatment facility while protecting ongoing plant operations and surrounding infrastructure. Contract requirements called for construction activities to avoid interference with the normal use of existing structures, roads, utilities and other operating facilities.
• Provided the temporary construction protections required to safely perform the building modification, including staging, barricades, platforms, guards and other protective measures necessary for workers, County personnel, existing facilities and the surrounding work area.