Low Flow Groundwater Sampling has increasingly become an approved method for obtaining high quality groundwater samples. The US EPA has released standard operating procedures for low flow sampling and following such guidelines ensures the collection of samples that are representative of actual in-situ conditions. Low flow purging and sampling involves extracting groundwater at rates comparable to ambient groundwater flow (typically less than 500 ml/min), so that the drawdown of the water level is minimized, and the mixing of stagnant water with water from the screened intake area in a well is reduced. Stabilization of parameters (pH, D.O., conductivity, temperature, etc.) and turbidity of the purged water are monitored before a sample is taken, thus low flow ground water sampling methods facilitate equilibrium with the surrounding formation and produce samples that are truly representative of the formation water.
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