Engineering Assessment of the Miocene Aquifer System in Coastal Georgia
Radtke, Jonathan S.
Hemingway, Christopher D.
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Under contract to the Georgia Geologic Survey, Golder Associates Inc. (Golder) performed an investigation to characterize the water-bearing properties of the Miocene aquifer system in coastal Georgia (also referred to as the upper and lower Brunswick aquifers). The investigation focussed on specific areas where a cap has been imposed restricting further withdrawals from the Upper Floridan Aquifer. At selected sites in Bryan, Chatham, Effingham and Glynn counties, Golder installed pumping wells and observation wells within the Miocene aquifer(s) and performed 72-hour pumping tests. Results of the investigation revealed that the lower Brunswick aquifer is absent at the sites in Chatham, Effingham and Bryan counties. Furthermore, the upper Brunswick aquifer at these locations is poorly developed, producing sustainable yields of only five to 15 gpm. However, there are Miocene wells within the Brunswick aquifer in Bryan County that produce upwards of 100 gpm, indicating significant variation in the hydraulic properties of the Miocene aquifer system in this area. Both the upper and lower Brunswick aquifers are present at the Glynn County site. While the upper Brunswick aquifer at this location is capable of producing only about 10 gpm, the lower Brunswick aquifer can produce a sustainable yield of over 300 gpm. In addition to providing water resource information to planners, developers and industry, the data produced from this investigation will also be incorporated into regional groundwater flow and transport models being developed by the USGS for management of groundwater resources throughout coastal Georgia.