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)
Feild, James B.
Dowd, John F.
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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.
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