Evaluation of the Micropurge (Low-flow) Method to the Packer Method of Groundwater Sampling of Fractures in Crystalline Bedrock of the North Georgia Piedmont (Poster)
Author(s)
Feild, James B.
Dowd, John F.
Advisor(s)
Editor(s)
Hatcher, Kathryn J.
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Abstract
In recent years, the micropurge (or low-flow) method of collecting groundwater samples has become
popular. The advantages of the method include low cost
of purge water disposal due to small volumes, minimal colloidal material in the samples, and shorter sampling
time The method assumes that water will flow
horizontally from the formation to the pump in the well with minimal mixing of casing water. Normally it is limited to use in wells with short screens, and pump rates low enough to minimize drawdown and volatilization of
contaminants. Puls et al. (1996) recommends the use of packers for wells with long screens or open borehole fractured bedrock wells. Without the use of packers, the
risk of spreading contamination to clean portions of the aquifer is high. In a fractured-bedrock aquifer at a contaminated site near Danielsville, Georgia, groundwater
samples were collected from fractured-bedrock wells using
the micropurge method and the packer method.
Comparison of the two methods indicate that formation
water was not sampled when the micropurge method was
used.
Sponsor
Sponsored and Organized by: U.S. Geological Survey, Georgia Department of Natural Resources, Natural Resources Conservation Service, The University of Georgia, Georgia State University, Georgia Institute of Technology
Date
2001-03
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Text
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Proceedings