Client project details

Cobb County-Marietta Water Authority, GA (Countywide Groundwater Exploration & Development)

The Project

EGGI was contracted, after a comprehensive competitive bid review, to conduct a regional (365 square mile) Countywide groundwater resource investigation for the Cobb County-Marietta Water Authority (CCMWA), the second largest water purveyor in the State of Georgia. The CCMWA currently obtains water from artificially impounded surface water reservoirs.  EGGI was contracted to conduct a bedrock aquifer exploration and development program with the intention of using groundwater resources to offset peak water demand periods.

EGGI synthesized hydrogeologic parameters based on detailed field investigations to locate 11 primary areas within the County considered favorable for potable groundwater resource development.  Based upon geotechnical data collected to-date, including photolineament analysis, bedrock mapping, bedrock fracture fabric analysis, and geophysical surveys, a total of 10-15 million gallons per day (MGD) was estimated to be available for groundwater supply development from bedrock aquifers. All sites selected had an extensive contaminant threat review to assure that wellhead protection measures could be implemented.

Status/Results:

EGGI’s detailed report and analysis of the County’s groundwater resources received high acclaim from the Georgia Geological Survey, the United States Geological Survey (USGS), and the Cobb County-Marietta Water Authority. EGGI’s findings enabled the CCMWA to make important decisions regarding both available water resources. Nearly 1 MGD was developed from the first two wells drilled into crystalline rocks of the Georgia Piedmont province. Assessments of off-site impacts to groundwater withdrawals from these bedrock aquifers was required as part of this investigation.

"Cobb County-Marietta Water Authority is developing groundwater to supplement our surface water supply.  We went through a detailed procurement process to select an experienced groundwater consultant for identifying potential well sites in Cobb County ... Emery & Garrett Groundwater, Inc. was ranked the highest of all firms and was selected to look at the entire County for us ... We were very pleased with their product ... I highly recommend Emery & Garrett Groundwater, Inc. for any groundwater exploration and development project.”

Dr. Philip R. Karr, General Manager, Cobb County-Marietta Water Authority, Georgia

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EGGI synthesized hydrogeologic parameters based on detailed field investigations to locate 11 primary areas within the County considered favorable for potable groundwater resource development.

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