What Ground Water Remediation Standards should be applied to sites after the Ground Water Quality Standards were readopted on November 7, 2005?
Any site or Area of Concern (AOC) that did not have a No Further Action letter or Remedial Action Workplan approval from the Department before November 7, 2005 must apply the new Ground Water Remediation Standards that went into effect on November 7, 2005. Any site or Area of Concern (AOC) that had a No Further Action letter or Remedial Action Workplan approval from the Department before November 7, 2005 may apply the Ground Water Remediation Standards that were in effect prior to that date, with one exception. For Department standards that were lowered by an order of magnitude or more than the standard that was in effect prior to November 7, 2005, the new, lower standard must be applied. There are 14 constituents whose groundwater quality standard was lowered by an order of magnitude or more.
