The testing program concluded that ozonation is the most effective and optimal process for both meeting the "CT" requirements of the Surface Water Treatment Rule and for destroying the organic compounds that form DBPs. It was also recommended that chloramines be used for secondary disinfection as an effective means of maintaining a residual throughout the distribution system and for preventing in-system THM formation. The full-scale disinfection facility concept is shown schematically and includes: new variable speed raw water pumps; 5,200-feet of 12-inch transmission main between the raw water pump station and disinfection facility; new treatment building to house ozone generation and feed equipment (for primary disinfection); sodium hypochlorite and liquid ammonia systems (for secondary disinfection); sodium hydroxide system (for pH adjustment); fluoride system; emergency power generator; and associated electrical, instrumentation, HVAC systems and administrative facilities. In addition, an ozone contact tank and a 250,000 gallon finished water storage tank will also be constructed. The new facilities are being designed to allow future expansion for a filtration process, if required due to changes in the SDWA regulations. The estimated project capital cost is $3,240,000. The District is under a Consent Order from the Maine DHE to complete the construction of the disinfection facility by September 1995.