S.E. Milford 0.75 MG Spheroidal Elevated Water Storage Tank

Key Accomplishments

Johnston Construction Company

• Completed site clearing, grading and general site development required to prepare the elevated-tank site for foundation and infrastructure construction.
• Performed construction surveying and layout to establish the tank foundation, site improvements, piping and associated project features.
• Removed and disposed of existing site debris encountered within the project area as part of site preparation.
• Constructed the tank's auger-cast pile foundation system, providing deep-foundation support for the new elevated water storage tank.
• Coordinated and performed required pile testing and foundation verification associated with the elevated-tank foundation system.
• The project specifications required the pile-supported tank foundation to incorporate a reinforced-concrete cap foundation, with pile design developed to support the tank, stored water and associated appurtenances.
• Auger-cast pile construction utilized the specified continuous-flight hollow-stem-auger installation method, with high-strength grout placed as the auger was withdrawn from the bearing stratum.
• The auger-cast pile specification required minimum 4,000-psi grout and placement of reinforcement into the fresh pile grout following pile installation.
• Installed CB&I-furnished tank foundation anchor bolts, coordinating the tank-support interface with the foundation concrete and tank erection requirements.
• Performed structural concrete construction at the tank base, supporting the pile-foundation and elevated-tank structural system.
• Completed the overflow splash pad and associated drainage/restoration work required at the tank site.
• Installed water-system piping associated with the elevated tank, including watermain, valves, fittings and hydrant-related work within JCC's civil/mechanical package.

Concrete Services Division

• Concrete Services Division, LLC served as Trade Subcontractor to Johnston Construction Company for the concrete portion of the foundation supporting the new 750,000-gallon S.E. Milford Elevated Storage Tank.
• Furnished the labor, materials, tools and concrete-construction resources required for forming and concrete placement of the elevated-tank foundation in accordance with the project drawings, specifications and CB&I foundation requirements.
• Mobilized and demobilized concrete equipment, tools and supplies required to execute the foundation-concrete package.
• Furnished form materials and lumber and performed installation and stripping of concrete forms for the tank-foundation construction.
• The subcontract billing schedule identified approximately 913 square feet of foundation formwork, including footing, slab-on-grade and substantial curved-wall forming.
• Formed approximately 792 square feet of curved foundation wall, representing the largest individual formwork component identified in CSD's pricing schedule.
• Performed concrete-placement labor for approximately 84 cubic yards of foundation concrete, including wall and slab-on-grade construction.
• The foundation-concrete schedule included approximately 74.5 cubic yards of wall concrete, together with slab-on-grade placements associated with the tank foundation.
• Completed concrete-finishing operations incorporating float/screed finishing, machine-trowel finishing, point-and-patch work and bag finishing.
• Performed concrete curing across approximately 1,960 square feet of completed concrete surfaces.
• Furnished labor and materials for concrete accessories including waterstop, caulking, vapor barrier, premolded joint material, saw-cut joints and joint sealing.
• Performed reinforcing-steel placement, with the subcontract billing schedule identifying approximately 3.67 tons of reinforcing steel within the foundation-concrete work.
• Provided associated reinforcing-mesh placement and concrete reinforcement support as part of the structural foundation package.
• Coordinated concrete construction around the project's auger-cast pile foundation system, including pile-top chipping where required to prepare the deep-foundation interface for subsequent concrete work.

Electrical Services Division

• Electrical Services Division, LLC served as Trade Subcontractor to Johnston Construction Company for the electrical portion of the new 750,000-gallon S.E. Milford Elevated Storage Tank in Milford, Delaware.
• Furnished the labor, materials and tools necessary for the electrical construction package associated with the elevated water-storage facility.
• Installed extensive electrical conduit, wire and equipment connections required throughout the tank-site electrical system.
• Furnished and installed lighting, switches and receptacles serving the elevated-storage-tank facility.
• Installed the project's LP panelboard and surge-protection unit, providing distribution and protection for the tank-site electrical system.
• Furnished and installed electrical boxes and devices as part of the complete electrical package.
• Performed work associated with switchgear installation and electrical distribution for the elevated-tank site.
• Installed the specified ground ring at the base of the tank, providing the grounding infrastructure associated with the electrical installation.
• Coordinated electrical installations with JCC's civil construction, tank-foundation work and CB&I's elevated-tank construction.
• Performed electrical work within a site containing major civil, structural, water-piping and elevated-tank construction, requiring close coordination of conduit routing, equipment locations and installation sequencing.
• Obtained and coordinated the required electrical permit associated with ESD's work.
• Mobilized and demobilized electrical tools, equipment and supplies required for performance of the subcontract.
• Reviewed required electrical submittals and operation-and-maintenance documentation associated with the installed equipment.
• Coordinated electrical materials furnished by other project participants so equipment and electrical interfaces could be incorporated into ESD's installation.