Paxton Transmission Main & Booster Pump Station

Client—City of Kelso, Washington

The City hired Gibbs & Olson to provide survey, design and construction phase services for the Paxton transmission main and a new booster pump station facility.

The project eliminated an aging water main and resolved easement encroachment issues that were caused by residential structures being built over the existing pipeline.

Gibbs & Olson evaluated two alignment alternatives to replace the water main. The selected alternative replaced 2,200 feet of ductile iron water transmission main improvements. The project also included installing 500 feet of 4-inch ductile iron water main to serve the 15 residential connections.

A new pump booster pump station facility was also constructed on an existing concrete slab at the Paxton Reservoir site. Gibbs & Olson prepared a project report for review and approval by the Washington State Department of Health. The booster pump facility was a package system designed to increase domestic water service pressure to 15 residences that experiencing low water pressure (less than 30 psi). The pump station also included two variable frequency drive pumps (with a capacity of 30 gallons per minute), valves, piping, electrical, control and pump enclosure. Included in the overall design, a manual transfer switch and generator receptacle were provided.