Coal Ash Pond Dewatering & Water Treatment

Project Profile

  • Project Location : Iowa
  • Client Industry : Contractor / Consultant
  • Owner Industry : Utility
  • Gwtt Scope : Design / Build / O&M
  • Contract Value : $30M
  • Project Duration : 24 Months
  • Contaminants : TSS, pH, Iron, Aluminum
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Key Project Details

  • >1,000 deep extraction wells for dewatering operations
  • 4,000 GPM treatment system consists of coagulation / flocculation, pH adjustment, a 250,000-gallon clarifier, mechanical filtration, and eight 10,000-lb media vessels
  • GWTT designed, mobilized, constructed, and started up both systems
  • Ongoing 24/7 O&M services provided for the full life of the project to dewater and treat a 171-acre coal ash pond


  • Busy project site with multiple sub-contractors requiring careful and coordinated planning and communication activities between all parties
  • Year-round project execution required continuous work through sub-freezing winter temperatures and summer peaks of >100F.
  • Ash excavation required dewatering system build and startup to meet aggressive deadline