A04_SOW_GRAND_JUNCTION_AIR_CENTER_Lift_Station.pdf

GRAND JUNCTION AIR CENTER

SEWAGE LIFT STATION

140L1724Q0059 The Grand Junction Air Center (GJAC) is a wildland fire dispatch center with other operations staff and seasonal smoke jumpers and aircraft to assist with wildland fire control. During fire season they can have as many as 25 staff with frequent long hours and generally a minimal staff to man the radios 24 hours a day, 7 days a week. It has several bathrooms, showers and 2 kitchenette’s. It was built in 2005-2006 and is a two-story structure. Due to its location on the compound it is lower than the gravity feed sewer system that works for the rest of the compound and requires a sewage lift station to operate. It is located on Airport property and is governed by their rules for entry. It is located at 2774 Landing View Lane, Grand Junction, CO 81506 and the airport authority gate is # 28.

The sewage lift station is located south of GJAC and west of the fire retardant lagoon. It is the white fiberglass top with a green base.

The white lid of the sewage lift station can be seen outside of the fire retardant logoon fence on the upper left of this picture (apologies for the photo quality). This photo is to give a reference as to the layout of the of the sewage lift station to the GJAC building.

The current system is 19 (+) years old, is completely inoperable and is at the end of its useful life. It is a Fairbanks-Morse wet well, redundant, self-priming system. The pumps are mounted on a plate on top of the wet well along with the vacuum pump priming pots, the wet well is 4’ ID, the exact depth of the wet well is unknown at this point, but Fairbanks-Morse does not recommend a lift of over 18’. The wet well is intact and there seems to be no leaks.

I believe this is the wet well going in, the access ladder faces a westerly direction, the port most visible is the discharge port to take the sewage up to the gravity system and the partially visible port on the northerly side is the incoming sewer from the building. Please note that other than the integrity of the wet well, the Bureau of Land Management (BLM) cannot give an accurate assessment of the entire system as far as wear and tear.

The BLM would like a new (redundant) sewage lift system installed on the existing wet well. The current Fairbanks-Morse system is targeting a rate of 100GPM with a 40’ TDH. It is a 460 Volts AC, 3 phase power with control voltages of 120 VAC. This shall include proper protection from the weather, freeze protection and alarm systems to indicate high fluid level conditions and eminent freeze protection problems. All necessary equipment, components and ancillary items will be furnished by the contractor. A warranty is required and if cranes or other lifting equipment is necessary, the contractor shall furnish this equipment as well and will coordinate with the airport authority as to the height of this equipment while in use. Due to the rules and regulations of this being on airport property, the contracting crew will need to be escorted by a badged BLM person.

The BLM is completely open to any new/improved designs/equipment that will be able to work with the existing wet well and our electrical power options. Optimally our desire is to have a very reliable system that can be supported locally.

Location where the lift station dumps into the gravity sewer.

View of the existing Fairbanks-Morse system.