GROUND WATER UNDER THE DIRECT INFLUENCE (UDI) OF SURFACE WATER

Any water beneath the surface of the ground with: 1) significant occurrence of Insects or other macroorganisms algae. or large-diameter pathogens such as Giardia lamblia or, 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 must be determined for individual sources in accordance with criteria established by the State. The State determination of direct influence may be based on site-specific measurements of water quality and/or documentation of well construction characteristics and geology with field evaluation.