327 IAC 6.1-2-55.3 "Surface conduit to a subsurface feature" defined

Sec. 55.3. "Surface conduit to a subsurface feature" means any surface expression of an enhanced pathway to a natural, geologic formation or manmade workings beneath the land surface. A surface conduit may include a sinkhole, slotted tile riser, or catch basin. A subsurface feature may include underground mines, aquifers, or underground streams.