A general description of the work to be done under these contract documents is described as follows. · Demolition and removal of the existing Biofilter system, which includes the blower, humidification chamber, FRP piping, FRP diffusers, and media. · Replacement of new Biofilter system, including blower, humidification chamber, FRP piping, FRP diffusers, and media. · Demolition and removal of existing 1” service water piping that is used as sprinkler system for the biofilter system. · Replacement of new 1” service water piping and sprinklers to be used as sprinkler system for the biofilter system. · Removal and replacement of the existing 6” drain piping that connects the drainage from the biofilter system to the existing ash lagoon pump station. · Installation of approximately 450 feet of 4-inch water main as shown on the drawings. · Installation of a foam suppression system that is comprised of spray nozzles suspended above the flow channel of the final outfall structure. The system will include a backflow preventor and water service line to a City of St. Louis water main.

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