Soil criterion for PCDD/F?

[Byron Bodo <bodo@interlog.com>]

  Sorry if this has been thrashed over before.
  
  Has the US, presumably the EPA, proposed any soil
  citeria for PCDD/Fs?  
  
  Presumably there a magic number for the total TEQ of 
  the toxic 17 is all that would be required.
  
  If so, would it apply to the cumulative TEQ of PCDD/Fs &
  dioxin-like congeners of PCBs / PCDEs / PCNs and 
  whatever else has planar congeners with similar modes 
  of toxicity?  (not that i expect a consensus on the TEFs 
  for PCBs let alone any of the others before hell freezes over)
  
  TIA
  
  -bb