Aquifer Vulnerability in the Piedmont and Coastal Plain: Some Environmental Tracer Evidence of Recharging
Stone, Peter A.
Devlin, Robert J.
Moore, Jerry P.
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Detectable tritium, elevated nitrate concentration, and radiocarbon in ground water are used as tracers from the surface environment in surveys to determine the innate (i.e., physical hydrologic) vulnerability to contamination of major aquifers in different geologic provinces. Aquifers in the piedmont and innermost coastal plain show widespread vulnerability. The more widely and readily obtained nitrate data suggest that higher vulnerability also occurs in several parts of the middle and lower coastal plain. However, natural geologic or hydrologic protection of principal aquifers is evidenced in many coastal-plain areas by very old ground water (determined by ¹⁴C).