Carnation Sewer System

Project overview

The City of Carnation Sewer System project provided a complete vacuum sewer to transport wastewater from every building in the city to a new treatment plant. Previously, every facility was served by septic systems, which were decommissioned once the project was completed.

As a subconsultant to Roth Hill Engineering Partners, Vanir performed a constructability review, bid marketing and bid/award assistance, followed by construction management services that included inspection, materials testing and community relations support.

The project consisted of:

  • Collection System: Installation of 56,600 linear feet (LF) of vacuum sewer pipe (of various sizes and types); valves, valve pits and appurtenances; 12,300 LF of gravity side sewers; 4,550 LF of sewer force main; 470 LF of water mains, valves and hydrants; 310 LF of storm drains and appurtenances; 360 LF of access road improvements; and asphalt trench patches and overlays in various locations throughout the city
  • Vacuum Station: Construction of a 1,500-square-foot concrete masonry unit sewage vacuum station with at-grade and below-grade concrete slabs. Equipment inside the building consisted of a 7,500-gallon vacuum collection tank, four vacuum pumps, two sewage pumps, piping, building mechanical and electrical equipment and other appurtenances. The project also involved building excavation, underground piping, installation of an outdoor, standby diesel electric generator and site work.


2009 CMAA Pacific Northwest Chapter – Project Achievement Award

Carnation, Washington
City of Carnation

Roth Hill Engineering Partners


Collection System: Buno Construction LLC

Vacuum Station: McClure & Sons

Construction Cost
$9.9 Million
Start Date
Completion Date