Gifford Pinchot State Park Sewage Treatment Plant Rehabilitation

Key Accomplishments

Johnston Construction Company

• The company provided temporary sewage screening, bypass pumping, process-water pumping, monitoring, maintenance, and supporting temporary systems required to keep wastewater flowing during construction.
• JCC removed the existing main-lift comminutor, level controls, wet-well slabs, grit, solids, debris, and associated equipment required for the new installation.
• The company constructed a new influent box and installed a new vertical cylindrical fine-screen system for screening, washing, dewatering, and transporting solids from the incoming wastewater.
• JCC installed fiberglass-reinforced-plastic grating, structural supports, handrails, a double-leaf chain-link access gate, and a reinforced-concrete convenience pad at the main lift station.
• The company installed a new bypass-pumping connection and modified the main-lift roof to accommodate the new equipment and operating-access arrangement.
• JCC removed and replaced the existing air-distribution piping, diffuser assemblies, valves, supports, and related components serving the treatment plant’s aeration tanks.
• The company removed grit and accumulated material from the treatment tanks and repaired leaking concrete joints, cracks, penetrations, and deteriorated surfaces.
• JCC installed a new aeration system and tested the air piping, valves, diffusers, and distribution arrangement for proper operation.
• The company installed Owner-furnished replacement components for the settling-tank collector-drive systems.
• JCC replaced the existing eight-inch settling-tank drain valves and operating stems.
• The company removed and replaced deteriorated fiberglass roofing, supporting purlins, and handrails at the settling tanks.
• JCC enlarged and modified the existing reinforced-concrete chlorine contact tank.

Concrete Services Division

• Concrete Services Division performed concrete forming, placement, finishing, curing, and related concrete work for the rehabilitation of the Gifford Pinchot State Park sewage-treatment facilities.
• CSD furnished the labor, form materials, form lumber, tools, finishing equipment, curing supplies, and supervision required for its assigned concrete scope.
• The company installed and stripped approximately 883 square feet of concrete formwork associated with slabs, walls, and other treatment-plant improvements.
• CSD completed approximately 163 square feet of slab-on-grade formwork and approximately 720 square feet of straight-wall formwork.
• The company placed approximately 10.16 cubic yards of slab-on-grade concrete and approximately 12.54 cubic yards of wall concrete.
• CSD placed approximately 3.33 cubic yards of concrete fill as required for the rehabilitation work.
• The company performed floating and screeding over approximately 345 square feet of concrete surface.
• CSD completed point-and-patch repairs over approximately 720 square feet of exposed concrete.
• The company performed curing work covering approximately 1,228 square feet of newly placed concrete.
• CSD installed concrete accessories associated with joints, waterstops, caulking, and related concrete details.
• The company installed approximately 250 square feet of reinforcing mesh within its assigned work.
• CSD installed and coordinated approximately 135 dowels for connections between new and existing concrete construction.
• The company applied bonding compound at approximately 61 designated locations to support proper adhesion between concrete placements and existing surfaces.
• CSD coordinated concrete deliveries purchased by JCC, concrete-pumping services paid for by JCC, and field-testing activities performed by the project testing laboratory.