An Explanation of Significant Differences (or ESD) is a CERCLA (or Superfund) decision document prepared when there has been a significant change in cost, performance, or cost of a remedy selected in a Record of Decision (ROD). The significant change to the remedy may be as a result of new information.

In 2002, EPA issued an Explanation of Significant Differences for the Butte Mine Flooding Operable Unit (or BMFOU) of the greater Butte area Superfund complex. You can download the full ESD below.

 

 

EPA Explanation of Significant Differences for the Butte Mine Flooding Operable Unit (2002)
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