The Town of Wawarsing was experiencing an increase in demand for public water supplies. The service area in question was previously supplied by individual wells that were impacted by the New York City Department of Environmental Protection (NYCDEP) water supply tunnel system.
To meet the increase in demands, LaBella was tasked with the design of a new Water District to supply the service area. This work includes the design and construction of a water distribution storage standpipe, a wellfield consisting of three production wells, a water treatment facility, and a distribution network consisting of approximately 15,000 linear feet of water main. Prior to starting a conceptual layout, a hydraulic model developed in Water CAD® was implemented to ensure that proper pipe sizing and location of storage was met.
The selected storage design for this project was based on a 0.5 MG glass-fused-to-steel bolted water storage tank. The wellfield design was based upon the installation of three eight-inch diameter wells with submersible pumps. The ultimate pumping design was to accommodate a system flow of 250 GPM between the three wells while maintaining a safe level of drawdown in the aquifer. The ultimate treatment capacity of the water plant was designed to deliver 250 GPM to the distribution and storage system.
The selected aquifer had a water quality issue with manganese not meeting maximum contaminant level (MCL) requirements; therefore, manganese reduction was designed utilizing a greensand filtration system to reduce the manganese to meet the MCL. The manganese-reduced production water was then injected with chlorine and introduced into a clearwell to achieve disinfection contact time prior to being delivered to the distribution system through booster pumps delivering 250 GPM at a TDH of 220 feet.