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Jefferson WWTP Improvements

Name: Jefferson WWTP Improvements
Location: Jefferson, OR
Status: Completed
Type: Waste Water Treatment Plants
Owner: City of Jefferson
Engineer: Westech Engineering, Inc.

The Jefferson Waste Water Treatment Plant Improvements project consisted of:

  • providing soil stabilization at the jobsite by means of over excavating the surface layer of soft soils and backfilling with imported coarse-grained granular material
  • 30 day monitoring of the completed site fill for settlement prior to tank construction
  • construction of new influent pump station with three submersible pumps, new elevated headworks with a mechanically cleaned screen,  two new sequencing batch reactor basins, a new equalization basin, and a new concrete channel for UV disinfection equipment
  • furnishing and installing packaged SBR treatment equipment and UV disinfection equipment
  • construction of new blower and electrical control building equipped with five blowers and a standby generator
  • construction of new operations building with laboratory, offices, mud room and restroom
  • rehabilitation of the existing contact stabilization basin and convert to an aerobic digester
  • grading, paving and site piping, electrical and instrumentation work 
  • construction of approximately 200 feet of 12" influent gravity sewer pipelines and construction of approximately 1,670 feet of 24" influent gravity sewer pipelines
  • construction of a new 26" outfall pipeline and diffuser extending into the Santiam River which had to be completed in a two month window of time
  • Design Capacity of Facility-900 gpd

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