Wastewater Treatment Plan
 Harrington, Washington

USKH designed a combination primary treatment/recirculating granular filter/infiltrative wetland facility to treat and dispose of the city of Harrington’s domestic wastewater. The facility has a peak hydraulic capacity of 329,000 gallons per day, to accommodate population growth through 2024; average daily flows in 2002 were 80,000 gallons per day.

The project included:

  • Obtaining and administering USDA Rural Development grant and loan funding,
  • A flood plain study and flood map revision,
  • Boundary and topographic surveying,
  • Removal and land application disposal of approximately 450 dry tons of municipal sewage sludge,
  • Installation of a new water main to serve the site,
  • Relocation of utilities,
  • Treatment process design,
  • Wetland plant selection and integration with the existing lagoon cell topography. The new infiltrative wetlands will cover four acres of the two existing 2.5-acre lagoons.
  • Geomembrane liner selection and installation design,
  • Earthwork for lagoon and filter dikes,
  • Gravity underdrain for lined aeration cells,
  • Soil gas venting built in to liner system,
  • Design of two acres of filter beds,
  • Multi-pump timed filter dosing,
  • All necessary valves and controls
  • Three separate bid packages,
  • Implementing low maintenance treatment operations in two stages.

 

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