Artesian Llangollen Clearwell Repairs

Johnston Construction Company

• Served as Prime Contractor for the comprehensive rehabilitation of the reinforced-concrete clearwell at Artesian Water Company’s Llangollen Water Treatment Plant. The work addressed deterioration identified during a prior structural inspection and restored the interior concrete, piping, access systems and protective coatings of the potable-water containment facility.
• Removed approximately 10 cubic yards of accumulated lime, silt and organic debris from the clearwell floor, providing access to the existing reinforced-concrete surfaces for inspection, repair, surface preparation and coating. JCC also removed accumulated organic material from the pump impeller housings and strainers.
• Rehabilitated the clearwell access systems by removing deteriorated ladders and installing two new approximately 10-foot aluminum ladders at the aerator access hatches. The existing replacement ladder at the interior access hatch was also cleaned of spot laminar corrosion and protected with an approved epoxy coating.
• Restored and recoated major internal steel and cast-iron piping components, including approximately 200 square feet of the 14-inch aerator pipe manifold and approximately 150 square feet of 10-inch pump-intake piping. Rust and laminar corrosion were removed before application of the specified protective epoxy coating system.
• Removed abandoned internal piping and repaired obsolete penetrations through the clearwell structure. The work included removal of two unused 6-inch pipes and sealing unused ceiling-slab and wall openings with reinforcing steel and epoxy concrete to restore the integrity of the reinforced-concrete enclosure.