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American Council of Engineering Companies 
2004 Engineering Excellence Grand Award
CATEGORY E - SPECIAL PROJECTS 
SUB-SURFACE DRAINAGE/CONSOLIDATION SYSTEM 
POWNAL, VERMONT
Project Highlights
  • Reclamation of superfund site for location of a new wastewater treatment facility.
  • Unstable clay layer at depth would result in excessive settlement of 3"-5" over 5-10 years.
  • Pile foundations would not be cost effective or practical due to soils.
    Wick drains purge moisture from unstable clay layer and accelerate consolidation of clay layer to acceptable consolidation.
  • $70,000 installation project saved 3-5 years of consolidation from conventional pre-loading, which would have delayed the project to the point that the site would have been unacceptable.
  • Close coordination with EPA to integrate this work into the phases of their overall lagoon clean-up.
  • Cost of wick drain installation and pre-loading of site were including in EPA clean-up project funding, saving the town of Pownal $400,000 in project costs as well as substantial time.

 

 
 

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