By National Academies Press
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Additional info for Groundwater Contamination
It should be emphasized that the case histories used in this survey only indicate the potential magnitude of the problem rather than the actual magnitude. Because the information deals only with specific incidents, it usually only provides an indication of the range and importance of point sources but not of all nonpoint sources. Where point sources were documented and known to be of importance, an analysis of them is also given. Arizona Arizona uses 4800 million gallons per day (mgd) of groundwater, which is 61 percent of its total water use (Fuhriman and Barton, 1971).
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EPA nor the EAC summaries can be considered complete as they do not result from comprehensive national surveys. It is difficult to estimate severity from these summaries as there is no established method for doing so. Essentially the information contained in the EAC state summaries presents a "best-case" scenario; the situation can only change as new cases of contamination are discovered. S. S. EPA did regional summaries and because the methods of assessment were different. S. EPA summaries are empirical assessments relying on the expertise of professionals who had worked in the regions studied (J.