Ground Water Under the Direct Influence (UDI) of Surface Water

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Any water beneath the surface of the ground with 1. significant occurence of insects or other microorganisms, algae, or large-diameter pathogens; 2. significant and relatively rapid shifts in water characteristics such as turbidity, temperature, conductivity, or pH which closely correlate to climatological or surface water conditions. Direct influence is determined for individual sources in accordance with criteria established by a state.
Source: Terms of the Environment


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