Groundwater Sampling Methods
by: Sebastien Fortin, E.I.T., M.Sc.
Direct Sampling
Direct sampling pertains to the "on-going" collection of groundwater samples and determination of water quality parameters (such as pH, EC/TDS, temperature...) as drilling proceeds and groundwater is purged/flushed out of a borehole. The first sample at a given depth should be considered only indicative of real groundwater conditions and any test data shall be seen as preliminary.
Depending on the drilling method used groundwater can be brought to surface by several methods namely during yield test, bailing, surging, etc... For any given depth, the longer the water "retrieval" period the more representative the water sample of "true" groundwater conditions, i.e. mixing and drilling-induced influences are diminished.
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