What does the Contaminated Groundwater Migration EI measure?
The GM EI documents whether contamination is below protective, risk-based levels or, if not, whether the migration of contaminated ground water is stabilized and there is no unacceptable discharge to surface water and monitoring will be conducted to confirm that affected ground water remains in the original area of contamination. This indicator normally is limited to sites with known ground water contamination. A conclusion of “migration of contaminated ground water under control” generally indicates that all information on known and reasonably expected ground water contamination has been reviewed and the above conditions are met. What are the categories to which NPL sites are assigned for the Contaminated Groundwater EI measure? • Contaminated ground water migration under control – indicates that all information on known and reasonably expected ground water contamination has been reviewed and that the migration of contaminated ground water is stabilized and there is no unacceptable di
