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An example of an injection well found on Northwest Field, Andersen Air Force Base, Guam. More than 100 wells collect storm runoff to support the replenishment of the Northern Aquifer, Guam?s largest fresh water source. The water entering the wells is tested twice a year to ensure potential sources of contamination are identified and resolved before they can become a problem in the aquifer. (U.S. Air Force courtesy photo)
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