Abstract
Water quality monitoring of production, industry and monitor wells tapping the upper Floridan aquifer have shown increases in chloride concentrations and/or temperature in some wells in Duval and St. Johns Counties, Florida. Meanwhile, in other nearby wells, the chloride concentrations and/or temperature are unchanged. It is postulated that the areal and vertical variability of temperature and/or chloride concentrations can be explained by the localized upward migration of poorer quality (more saline) water from zones in or below the Lower Floridan aquifer. The conduits for this upward flow are believed to be along isolated geologic structures (fractures and enlarged joints, solution conduits, and/or paleosinkholes) that have breached the middle semi‐confining unit of the Floridan aquifer system.A reconnaissance investigation was conducted to determine if land‐based high‐resolution seismic reflection techniques could be used to identify the presence of site specific karst geologic structures. The Mini‐Sos...
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