CONTAMINATED SOIL REMEDIATION

PROJECT HIGHLIGHT

Dalles OR

THE DALLES SMELTER PAH SOIL EXCAVATION
​THE DALLES, OR

  • Excavation and disposal of 55,000 tons of PAH contaminated soil at a former aluminum smelter
  • Demolition and removal of 4,000 lf of railroad track
  • Recovery and salvage of recyclable metals
  • Placement and grading of 40,000 tons of clean fill
  • Diversion, excavation, and restoration of contaminated drainage ditch

 

This project involved the removal of PAH and heavy metals contaminated soil from a former aluminum smelter in order to achieve an Oregon Department of Environmental Quality (DEQ) No Further Action (NFA) decision for the site. Great Lakes E&I excavated and loaded 55,000 tons of polycyclic aromatic hydrocarbon (PAH) contaminated soil for disposal at a local landfill. Excavation areas and depths varied across the site. After removal, Great Lakes E&I back filled disturbed areas with 40,000 tons of clean fill and graded the site to ensure positive drainage.

 

Another aspect of the project was recovery and salvage of remaining recyclable metals from the site. This included demolition and removal of 4,000 lf of railroad track, hand sorting to recover aluminum and other non-ferrous metals from former metal processing areas, and sweeping areas with magnets to recover ferrous metals from the site. Remedial action on the site included excavation of a drainage ditch to remove potentially contaminated materials. This effort required diversion of water, wetland excavation, lining the ditch with 60-mil HDPE liner, and back fill with wetland approved soils.