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  • 1MFG Inc., Fort Collins, Colorado, USA. jan.johnson@mfgenv.com

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Soil cleanup at the Dawn Mining Company uranium mill site in Washington utilized a GPS-based gamma scanning system for efficient characterization. This method accurately guided remedial action planning and ongoing soil remediation efforts.

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Area of Science:

  • Environmental Science
  • Geoscience
  • Nuclear Engineering

Background:

  • The Dawn Mining Company operated a uranium mill in Stevens County, Washington, processing ore and later extracting uranium from mine water treatment sludge.
  • Site operations spanned from 1957 to 1982 and 1992 to 2000, with permanent closure and license amendment in 2001.
  • The mill building was demolished in 2003, preceding site soil characterization in 2004.

Purpose of the Study:

  • To characterize contaminated soils at the former Dawn Mining Company uranium mill site.
  • To develop an efficient and accurate method for guiding remedial action planning and soil cleanup.
  • To establish a correlation between gamma exposure rate and radium concentration in soils.

Main Methods:

  • Utilized a GPS-based gamma scanning system for surface soil characterization.
  • Developed a correlation between shielded gamma exposure rate and radium (Ra) concentration in surface soils.
  • Employed backhoe trenches for subsurface soil sampling.

Main Results:

  • The GPS-based gamma scanning system proved efficient and accurate for site soil characterization.
  • A reliable correlation was established between gamma exposure rate and radium concentration in surface soils.
  • The characterization methods effectively guided the development of remedial action plans.

Conclusions:

  • GPS-based gamma scanning is an effective tool for characterizing uranium mill sites.
  • Accurate soil characterization is crucial for successful remedial action planning and cleanup.
  • The methods employed facilitated efficient and accurate soil remediation at the Dawn Mining Company site.