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Re: Background Levels



  US background is on the order of 4 to 14 ppt TEQ based on the USEPA Dioxin
  Report.  The full report is available at EPA Envirofacts webpage.
  
  The full title & doc. # is:
  
  EPA/600/6-88/005Ca June 1994 External Review Draft
  ESTIMATING EXPOSURE TO DIOXIN-LIKE COMPOUNDS
  VOLUME I: Executive Summary