Groundwater monitoring is
performed in a number of situations with varying objectives. It involves measuring the
physical and/or chemical properties of groundwater on a periodic basis.
Concentrations of contaminants are frequently monitored to determine if they
are increasing, decreasing, or remaining in the same range. Monitoring is also performed
at and in the vicinity of water supply sources to determine the quality of the water and
trends of indicators of water quality. Groundwater monitoring programs
normally involve an array of monitoring or observation wells or microwells.
The drawing on the right indicates a shallow overburden aquifer monitoring well and some
of its basic features. A well of this type makes it possible to measure the
groundwater elevation and permits water sampling to test the composition of the
groundwater.
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