J- -03-02 WTP AND DISTRIBUTION SYSTEM DESCRIPTION 2

ATTACHMENT J-1606000-03-02

WATER TREATMENT PLANT AND DISTRIBUTION SYSTEM DESCRIPTION

The Contractor shall develop, submit and implement an Integrated Maintenance Program (IMP) for the water systems and all mechanically and electrically interlocked ancillary parts, equipment, and components of the system including but not limited to wells, raw water piping, manual and automatically operated valves, hangers, fittings, vents, blow offs, check valves, pressure gauges, pressure sensors, variable frequency drives (VFDs), radio transmitters, control panels, monitoring gauges and meters, chemicals, water heaters, mixers, injectors, gaseous chlorine feed system and components, lime silo and fill and feed system and components, Wisprofloc polymer storage, mixing and feeding system and components, booster pumps, back flow preventers, fluoride storage, mixing and feed system, air compressors, air dryers, air filters, compressed air systems and components, fluid level and flow control systems and components, lift stations, screens, strainers, splitter boxes, centrifuges, conveyers, augers, water pumps, water/sludge separating equipment and additional equipment and components that perform the process of lifting raw water from the underground aquifer and creating finished water.

The existing Naval Support Activity Annapolis (NSAA) Water Treatment Plant (WTP) supplies an average of 0.98 million gallons of water each day to The United States Naval Academy (USNA). It obtains raw water from three groundwater wells and treats groundwater with a relatively high concentration of dissolved iron. The plant design capacity is 2.3 MGD, based on a clarifier design capacity limitation of 800 GPM/unit. The WTP operators monitor the plant and system twenty-four (24) hours per day, seven (7) days per week. When ground storage tanks are measured at low levels, the operators command the well-pumps to operate. Raw water is pumped from one or more of three supply wells to tray aerators on the roof of the WTP building. Following aeration, gaseous chlorine, dehydrated lime, Wisprofloc polymer and fluoride are injected ahead of the two solids contact clarifiers. Settled water is filtered via seven DynaSand® continuous backwashing, up-flow, deep bed, mono-media sand filters. Iron sludge from the two coagulation (COAG) tanks is drained out at the discretion of the operators. The iron sludge flows to the two gravity thickener tanks and then the sludge is pumped to the two centrifuges. The iron sludge is dewatered by the centrifuges; the iron cake is dropped into a dumpster to be hauled off NSAA property and disposed of appropriately by the Contractor. The centrate water is recycled back to the head works of the plant.