Fort Greely Utilities

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Doyon Utilities - Fort Greely

Fort Greely is located approximately 107 miles southeast of Fairbanks and just south of the community of Delta Junction. Fort Greely is approximately 7,200 acres and provides support to the adjacent Space Missile Defense Command. FGA has a working and resident population of approximately 820 persons.

Electrical Distribution System (EDS). The Fort Greely EDS includes: transformers, overhead and underground distribution circuits, poles and duct banks, vaults, switches, airfield lighting, and street lighting. Electric power for FGA is delivered through a Golden Valley Electrical Association (GVEA) substation that is adjacent to the Central Heat and Power Plan (CHPP). If FGA electric loads exceed the 2.5-MVA transformer rating, the CHPP diesel generators are used to meet peak loads. A major capital project being undertaken during the operational transition period by Doyon Utilities was the construction of a new 138 kV Switching Station, new 138 kV Substation with 20 MVA transformer to increase energy capacity at Fort Greely. Doyon Utilities is required under the utility privatization contract to fully reconstruct the electrical distribution system over the first 5 years.

Central Heat and Power Plant (CHPP) and Heat Distribution System (HDS). The CHPP contains three boilers that were installed in 1954. The three boilers are each rated at 50,000 lb/hr of 120-psig steam. Boiler fuel is Jet 50 A with a higher heating value of about 125,300 Btu per gallon. Steam generated at 120 psig is reduced to 60 psig and distributed to the buildings in the central cantonment area through steam piping running through underground utilidors. The utilidors include water and sewer lines and rely on heat loss from the steam lines to provide freeze protection. The total length of utilidor at FGA is approximately 18,300 linear feet, including both main utilidors and service utilidors.

There are five diesel engine generators able to produce 5.5 MWe output. All of the units are Jet 50 A-fueled and are currently used for peaking and for emergency backup. With the commissioning of the new 138 KV substation and 20 MVA transformer, these diesel generators will be placed into emergency standby mode only.

Potable Water Distribution System. The Fort Greely Potable Water Distribution System consists of wells, treatment equipment, pumps, ancillary structures, fire hydrants, valves, meters, and piping. FGA potable water is supplied by an underground aquifer approximately 200 to 400 feet below ground surface. The aquifer is recharged from the Delta River and Alaskan Mountain Range winter snow melt. FGA uses 9 raw water supply wells for all potable and non-potable water requirements. FGA is an isolated drinking water system with no outside ties to the City of Delta Water System. There are approximately 4.6 miles of pipe within the system. There are 32 fire hydrants connected to the FGA water system with 28 located in the main cantonment and 4 at North Post.

Wastewater Collection System. The Fort Greely Wastewater Collection System consists of: lift stations, manholes, force mains, and gravity piping. The wastewater system at Fort Greely consists of lagoons or septic tanks. All wastewater generated on FGA is collected and treated on FGA. No wastewater is transferred off base for treatment. There are two independent wastewater systems on FGA.

All the wastewater generated in the main cantonment area follows by gravity to the only lift station in the main cantonment area located in the treatment facility. The average daily flow to the lift station varies between 120,000 to 180,000 gallons per day. The wastewater treatment plant houses an Imhoff tank; the tank has 1.5 hours of retention time. The average flow from plant varies between 120,000 to 180,000 gallons per day. The sludge removed from the Imhoff tank is placed in drying beds.

There are two sewage lagoons that operate in series. Within each lagoon are two curtains that increase the flow time through the lagoons. The lagoons can be operated in parallel if needed. The normal retention time in the lagoons is approximately 11 days. The lagoons were recently upgraded with new membrane liners installed and air piping to the diffusers. There are approximately 21,100 linear feet of wastewater collection lines at FGA, ranging from 3 inches to 14 inches in diameter.