The City Of Manchester - NH
Clarifier Repairs
EPD: General Contractor Qualification Statements
wastewater treatment plant secondary clarifier repairs the wwtp has three 3 secondary clarifiers. two of the clarifiers are original equipment from **** and the third is from a large facility upgrade **** three secondary clarifiers were upgraded in 2010. the clarifiers, after 16 years in service, haveexperienced failures of the carbon steel fasteners, hardware and structural members that need replacement. the clarifier 2 48inch influent slide gate has failed and cannot be operated and needs to be replaced. theother two influent clarifier gates will also be replaced under this project. also, the secondary clarifier 48inch crossover pipe has no means of isolation and the city wishes for new fabricated steel plates to beinstalled at either end to block the pipe off. all of the work associated with the slide gate replacements andblocking off the crossover pipe will require significant bypass pumping effort to maintain continuous flowthrough the plant. lastly the city also requires the plant water system is