Water Booster Pump Station Modifications, Toutle River Safety Rest Area

Client—Washington State Department of Transportation

Gibbs & Olson was hired to provide the planning, design and construction phase services for the Toutle River Safety Rest Area water system upgrade. The system was experiencing problems associated with hydraulic transients (water hammer) in the buildings causing pipe joint failures and premature pressure tank bladder failures. Gibbs & Olson evaluated the water system and provided alternatives to resolve these operational issues in a predesign report. Gibbs & Olson designed the recommended upgrades which included removing the existing pump and electrical system and replacing it with a package booster pump system. The new system includes three pumps and motors with variable frequency drives each sized to provide 85 gpm at 165 feet of total dynamic head. The package booster pump system is on a skid, complete with suction and discharge piping, pumps, motors, variable frequency drives, electrical panel and pre-programmed control system. The project involved mechanical and electrical design of the package booster pump system as well as a new coating system in the underground concrete storage tank to replace the existing liner. The $130,000 construction project was completed during a shutdown of the rest area facility in October 2012.